{"id":55460,"date":"2025-08-13T23:04:33","date_gmt":"2025-08-13T15:04:33","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/55460.html"},"modified":"2025-08-13T23:04:33","modified_gmt":"2025-08-13T15:04:33","slug":"setpgid%e7%b3%bb%e7%bb%9f%e8%b0%83%e7%94%a8%e5%8f%8a%e7%a4%ba%e4%be%8b","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/55460.html","title":{"rendered":"setpgid\u7cfb\u7edf\u8c03\u7528\u53ca\u793a\u4f8b"},"content":{"rendered":"<h2>setpgid \u51fd\u6570\u8be6\u89e3<\/h2>\n<h3>1. \u51fd\u6570\u4ecb\u7ecd<\/h3>\n<p>setpgid \u662fLinux\u7cfb\u7edf\u8c03\u7528&#xff0c;\u7528\u4e8e\u8bbe\u7f6e\u8fdb\u7a0b\u7684\u8fdb\u7a0b\u7ec4ID&#xff08;Process Group ID&#xff09;\u3002\u8fdb\u7a0b\u7ec4\u662f\u8fdb\u7a0b\u7684\u96c6\u5408&#xff0c;\u7528\u4e8e\u4fe1\u53f7\u5206\u53d1\u548c\u4f5c\u4e1a\u63a7\u5236\u3002\u901a\u8fc7\u8bbe\u7f6e\u8fdb\u7a0b\u7ec4&#xff0c;\u53ef\u4ee5\u5c06\u76f8\u5173\u8fdb\u7a0b\u7ec4\u7ec7\u5728\u4e00\u8d77&#xff0c;\u4fbf\u4e8e\u7edf\u4e00\u7ba1\u7406\u548c\u63a7\u5236\u3002<\/p>\n<h3>2. \u51fd\u6570\u539f\u578b<\/h3>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">setpgid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">pid_t<\/span> pid<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">pid_t<\/span> pgid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>3. \u529f\u80fd<\/h3>\n<p>setpgid \u5c06\u6307\u5b9a\u8fdb\u7a0b&#xff08;\u7531pid\u6807\u8bc6&#xff09;\u52a0\u5165\u5230\u6307\u5b9a\u7684\u8fdb\u7a0b\u7ec4&#xff08;\u7531pgid\u6807\u8bc6&#xff09;\u3002\u5982\u679c\u8fdb\u7a0b\u7ec4\u4e0d\u5b58\u5728&#xff0c;\u5219\u521b\u5efa\u65b0\u7684\u8fdb\u7a0b\u7ec4\u3002\u8fd9\u4e2a\u51fd\u6570\u4e3b\u8981\u7528\u4e8e\u4f5c\u4e1a\u63a7\u5236\u548c\u4fe1\u53f7\u7ba1\u7406\u3002<\/p>\n<h3>4. \u53c2\u6570<\/h3>\n<ul>\n<li>pid_t pid: \u76ee\u6807\u8fdb\u7a0bID&#xff08;0\u8868\u793a\u5f53\u524d\u8fdb\u7a0b&#xff09;<\/li>\n<li>pid_t pgid: \u8fdb\u7a0b\u7ec4ID&#xff08;0\u8868\u793a\u4f7f\u7528pid\u4f5c\u4e3a\u8fdb\u7a0b\u7ec4ID&#xff09;<\/li>\n<\/ul>\n<h3>5. \u8fd4\u56de\u503c<\/h3>\n<ul>\n<li>\u6210\u529f: \u8fd4\u56de0<\/li>\n<li>\u5931\u8d25: \u8fd4\u56de-1&#xff0c;\u5e76\u8bbe\u7f6eerrno<\/li>\n<\/ul>\n<h3>6. \u76f8\u4f3c\u51fd\u6570&#xff0c;\u6216\u5173\u8054\u51fd\u6570<\/h3>\n<ul>\n<li>getpgid: \u83b7\u53d6\u8fdb\u7a0b\u7684\u8fdb\u7a0b\u7ec4ID<\/li>\n<li>setpgrp: \u8bbe\u7f6e\u8fdb\u7a0b\u7ec4&#xff08;\u7b49\u540c\u4e8esetpgid(0,0)&#xff09;<\/li>\n<li>getsid: \u83b7\u53d6\u4f1a\u8bddID<\/li>\n<li>setsid: \u521b\u5efa\u65b0\u4f1a\u8bdd<\/li>\n<\/ul>\n<h3>7. \u793a\u4f8b\u4ee3\u7801<\/h3>\n<h4>\u793a\u4f8b1&#xff1a;\u57fa\u7840setpgid\u4f7f\u7528<\/h4>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdlib.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;string.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;errno.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/wait.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token comment\">\/**<br \/>\n * \u663e\u793a\u8fdb\u7a0b\u7ec4\u4fe1\u606f<br \/>\n *\/<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">show_process_group_info<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">pid_t<\/span> pid <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getpid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">pid_t<\/span> pgid <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getpgid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">pid_t<\/span> ppid <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getppid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8fdb\u7a0bID: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> pid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7236\u8fdb\u7a0bID: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> ppid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8fdb\u7a0b\u7ec4ID: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> pgid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u4f1a\u8bddID: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getsid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/**<br \/>\n * \u6f14\u793a\u57fa\u7840setpgid\u4f7f\u7528\u65b9\u6cd5<br \/>\n *\/<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">demo_setpgid_basic<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">pid_t<\/span> original_pgid<span class=\"token punctuation\">,<\/span> new_pgid<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> result<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#061;&#061;&#061; \u57fa\u7840setpgid\u4f7f\u7528\u793a\u4f8b &#061;&#061;&#061;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u663e\u793a\u539f\u59cb\u8fdb\u7a0b\u7ec4\u4fe1\u606f<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;1. \u539f\u59cb\u8fdb\u7a0b\u7ec4\u4fe1\u606f:\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">show_process_group_info<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    original_pgid <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getpgid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5c06\u5f53\u524d\u8fdb\u7a0b\u79fb\u52a8\u5230\u65b0\u7684\u8fdb\u7a0b\u7ec4<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;2. \u521b\u5efa\u65b0\u7684\u8fdb\u7a0b\u7ec4:\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">pid_t<\/span> new_group_id <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getpid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u4f7f\u7528\u5f53\u524d\u8fdb\u7a0bID\u4f5c\u4e3a\u65b0\u8fdb\u7a0b\u7ec4ID<\/span><\/p>\n<p>    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;   \u5c1d\u8bd5\u5c06\u8fdb\u7a0b %d \u79fb\u52a8\u5230\u8fdb\u7a0b\u7ec4 %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getpid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> new_group_id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    result <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">setpgid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> new_group_id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>result <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;   \u2713 \u6210\u529f\u521b\u5efa\u5e76\u52a0\u5165\u65b0\u8fdb\u7a0b\u7ec4\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u9a8c\u8bc1\u8bbe\u7f6e\u7ed3\u679c<\/span><br \/>\n        new_pgid <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getpgid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;   \u65b0\u7684\u8fdb\u7a0b\u7ec4ID: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> new_pgid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>new_pgid <span class=\"token operator\">&#061;&#061;<\/span> new_group_id<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;   \u2713 \u8fdb\u7a0b\u7ec4\u8bbe\u7f6e\u6b63\u786e\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;   \u2717 \u8fdb\u7a0b\u7ec4\u8bbe\u7f6e\u53ef\u80fd\u6709\u95ee\u9898\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token function\">show_process_group_info<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;   \u2717 \u521b\u5efa\u65b0\u8fdb\u7a0b\u7ec4\u5931\u8d25: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>errno <span class=\"token operator\">&#061;&#061;<\/span> EACCES<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;   \u539f\u56e0&#xff1a;\u4e0d\u5141\u8bb8\u4ece\u4f1a\u8bdd\u9886\u5bfc\u8fdb\u7a0b\u66f4\u6539\u8fdb\u7a0b\u7ec4\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>errno <span class=\"token operator\">&#061;&#061;<\/span> EINVAL<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;   \u539f\u56e0&#xff1a;\u8fdb\u7a0bID\u6216\u8fdb\u7a0b\u7ec4ID\u65e0\u6548\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>errno <span class=\"token operator\">&#061;&#061;<\/span> EPERM<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;   \u539f\u56e0&#xff1a;\u6743\u9650\u4e0d\u8db3\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>errno <span class=\"token operator\">&#061;&#061;<\/span> ESRCH<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;   \u539f\u56e0&#xff1a;\u6307\u5b9a\u7684\u8fdb\u7a0b\u4e0d\u5b58\u5728\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token function\">demo_setpgid_basic<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>\u793a\u4f8b2&#xff1a;\u7236\u5b50\u8fdb\u7a0b\u7ec4\u7ba1\u7406<\/h4>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdlib.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;string.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;errno.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/wait.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token comment\">\/**<br \/>\n * \u5b50\u8fdb\u7a0b\u51fd\u6570<br \/>\n *\/<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">child_process<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> child_id<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5b50\u8fdb\u7a0b %d \u542f\u52a8\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getpid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u5b50\u8fdb\u7a0b %d \u7684\u539f\u59cb\u8fdb\u7a0b\u7ec4: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getpid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getpgid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5b50\u8fdb\u7a0b\u521b\u5efa\u81ea\u5df1\u7684\u8fdb\u7a0b\u7ec4<\/span><br \/>\n    <span class=\"token class-name\">pid_t<\/span> new_pgid <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getpid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u5b50\u8fdb\u7a0b %d \u5c1d\u8bd5\u521b\u5efa\u65b0\u8fdb\u7a0b\u7ec4: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getpid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> new_pgid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">int<\/span> result <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">setpgid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> new_pgid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>result <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u2713 \u5b50\u8fdb\u7a0b %d \u6210\u529f\u521b\u5efa\u65b0\u8fdb\u7a0b\u7ec4\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getpid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u5b50\u8fdb\u7a0b %d \u5f53\u524d\u8fdb\u7a0b\u7ec4: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getpid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getpgid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u2717 \u5b50\u8fdb\u7a0b %d \u521b\u5efa\u65b0\u8fdb\u7a0b\u7ec4\u5931\u8d25: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getpid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6a21\u62df\u4e00\u4e9b\u5de5\u4f5c<\/span><br \/>\n    <span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5b50\u8fdb\u7a0b %d \u7ed3\u675f\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getpid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/**<br \/>\n * \u6f14\u793a\u7236\u5b50\u8fdb\u7a0b\u7ec4\u7ba1\u7406<br \/>\n *\/<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">demo_parent_child_groups<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">pid_t<\/span> child1_pid<span class=\"token punctuation\">,<\/span> child2_pid<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">pid_t<\/span> original_pgid<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#061;&#061;&#061; \u7236\u5b50\u8fdb\u7a0b\u7ec4\u7ba1\u7406\u6f14\u793a &#061;&#061;&#061;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u663e\u793a\u7236\u8fdb\u7a0b\u4fe1\u606f<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7236\u8fdb\u7a0b\u4fe1\u606f:\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u8fdb\u7a0bID: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getpid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u539f\u59cb\u8fdb\u7a0b\u7ec4: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getpgid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u4f1a\u8bddID: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getsid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521b\u5efa\u7b2c\u4e00\u4e2a\u5b50\u8fdb\u7a0b<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;1. \u521b\u5efa\u7b2c\u4e00\u4e2a\u5b50\u8fdb\u7a0b:\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    child1_pid <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">fork<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>child1_pid <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">child_process<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>child1_pid <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u7236\u8fdb\u7a0b\u521b\u5efa\u5b50\u8fdb\u7a0b1: PID&#061;%d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> child1_pid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u5b50\u8fdb\u7a0b1\u7684\u8fdb\u7a0b\u7ec4: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getpgid<\/span><span class=\"token punctuation\">(<\/span>child1_pid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u521b\u5efa\u5b50\u8fdb\u7a0b1\u5931\u8d25&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521b\u5efa\u7b2c\u4e8c\u4e2a\u5b50\u8fdb\u7a0b<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\\\\n2. \u521b\u5efa\u7b2c\u4e8c\u4e2a\u5b50\u8fdb\u7a0b:\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    child2_pid <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">fork<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>child2_pid <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">child_process<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>child2_pid <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u7236\u8fdb\u7a0b\u521b\u5efa\u5b50\u8fdb\u7a0b2: PID&#061;%d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> child2_pid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u5b50\u8fdb\u7a0b2\u7684\u8fdb\u7a0b\u7ec4: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getpgid<\/span><span class=\"token punctuation\">(<\/span>child2_pid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u521b\u5efa\u5b50\u8fdb\u7a0b2\u5931\u8d25&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u6e05\u7406\u5df2\u521b\u5efa\u7684\u5b50\u8fdb\u7a0b<\/span><br \/>\n        <span class=\"token function\">kill<\/span><span class=\"token punctuation\">(<\/span>child1_pid<span class=\"token punctuation\">,<\/span> SIGKILL<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7236\u8fdb\u7a0b\u4e5f\u521b\u5efa\u65b0\u8fdb\u7a0b\u7ec4<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\\\\n3. \u7236\u8fdb\u7a0b\u521b\u5efa\u65b0\u8fdb\u7a0b\u7ec4:\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    original_pgid <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getpgid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">pid_t<\/span> parent_pgid <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getpid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u7236\u8fdb\u7a0b\u5c1d\u8bd5\u521b\u5efa\u65b0\u8fdb\u7a0b\u7ec4: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> parent_pgid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> result <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">setpgid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> parent_pgid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>result <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u2713 \u7236\u8fdb\u7a0b\u6210\u529f\u521b\u5efa\u65b0\u8fdb\u7a0b\u7ec4\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u7236\u8fdb\u7a0b\u5f53\u524d\u8fdb\u7a0b\u7ec4: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getpgid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u2717 \u7236\u8fdb\u7a0b\u521b\u5efa\u65b0\u8fdb\u7a0b\u7ec4\u5931\u8d25: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7b49\u5f85\u5b50\u8fdb\u7a0b\u7ed3\u675f<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\\\\n4. \u7b49\u5f85\u5b50\u8fdb\u7a0b\u7ed3\u675f:\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> status<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">pid_t<\/span> finished_pid<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>finished_pid <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">wait<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>status<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u5b50\u8fdb\u7a0b %d \u5df2\u7ed3\u675f&#xff0c;\u9000\u51fa\u72b6\u6001: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> finished_pid<span class=\"token punctuation\">,<\/span> <span class=\"token function\">WEXITSTATUS<\/span><span class=\"token punctuation\">(<\/span>status<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6062\u590d\u7236\u8fdb\u7a0b\u539f\u59cb\u8fdb\u7a0b\u7ec4<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\\\\n5. \u6062\u590d\u7236\u8fdb\u7a0b\u539f\u59cb\u8fdb\u7a0b\u7ec4:\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    result <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">setpgid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> original_pgid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>result <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u2713 \u7236\u8fdb\u7a0b\u6210\u529f\u6062\u590d\u539f\u59cb\u8fdb\u7a0b\u7ec4: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getpgid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u2717 \u7236\u8fdb\u7a0b\u6062\u590d\u539f\u59cb\u8fdb\u7a0b\u7ec4\u5931\u8d25: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token function\">demo_parent_child_groups<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>\u793a\u4f8b3&#xff1a;\u8fdb\u7a0b\u7ec4\u4fe1\u53f7\u5904\u7406<\/h4>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdlib.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;string.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;errno.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/wait.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;signal.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token comment\">\/**<br \/>\n * \u4fe1\u53f7\u5904\u7406\u51fd\u6570<br \/>\n *\/<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">signal_handler<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> sig<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8fdb\u7a0b %d \u63a5\u6536\u5230\u4fe1\u53f7 %d (%s)\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getpid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> sig<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strsignal<\/span><span class=\"token punctuation\">(<\/span>sig<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/**<br \/>\n * \u5de5\u4f5c\u8fdb\u7a0b\u51fd\u6570<br \/>\n *\/<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">worker_process<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> worker_id<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u8bbe\u7f6e\u4fe1\u53f7\u5904\u7406<\/span><br \/>\n    <span class=\"token function\">signal<\/span><span class=\"token punctuation\">(<\/span>SIGTERM<span class=\"token punctuation\">,<\/span> signal_handler<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">signal<\/span><span class=\"token punctuation\">(<\/span>SIGINT<span class=\"token punctuation\">,<\/span> signal_handler<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">signal<\/span><span class=\"token punctuation\">(<\/span>SIGUSR1<span class=\"token punctuation\">,<\/span> signal_handler<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5de5\u4f5c\u8fdb\u7a0b %d \u542f\u52a8&#xff0c;\u8fdb\u7a0b\u7ec4: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getpid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getpgid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521b\u5efa\u81ea\u5df1\u7684\u8fdb\u7a0b\u7ec4<\/span><br \/>\n    <span class=\"token class-name\">pid_t<\/span> new_pgid <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getpid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">setpgid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> new_pgid<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5de5\u4f5c\u8fdb\u7a0b %d \u6210\u529f\u521b\u5efa\u8fdb\u7a0b\u7ec4: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getpid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> new_pgid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6a21\u62df\u957f\u65f6\u95f4\u5de5\u4f5c<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5de5\u4f5c\u8fdb\u7a0b %d \u6b63\u5728\u5de5\u4f5c&#8230; (%d\/10)\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getpid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> i <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5de5\u4f5c\u8fdb\u7a0b %d \u7ed3\u675f\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getpid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/**<br \/>\n * \u6f14\u793a\u8fdb\u7a0b\u7ec4\u4fe1\u53f7\u5904\u7406<br \/>\n *\/<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">demo_process_group_signaling<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">pid_t<\/span> workers<span class=\"token punctuation\">[<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">pid_t<\/span> original_pgid<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#061;&#061;&#061; \u8fdb\u7a0b\u7ec4\u4fe1\u53f7\u5904\u7406\u6f14\u793a &#061;&#061;&#061;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u4fdd\u5b58\u539f\u59cb\u8fdb\u7a0b\u7ec4<\/span><br \/>\n    original_pgid <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getpgid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u4e3b\u8fdb\u7a0b\u539f\u59cb\u8fdb\u7a0b\u7ec4: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> original_pgid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521b\u5efa\u5de5\u4f5c\u8fdb\u7a0b\u7ec4<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\\\\n1. \u521b\u5efa\u5de5\u4f5c\u8fdb\u7a0b\u7ec4:\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        workers<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">fork<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>workers<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">worker_process<\/span><span class=\"token punctuation\">(<\/span>i <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>workers<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u521b\u5efa\u5de5\u4f5c\u8fdb\u7a0b %d: PID&#061;%d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> i <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> workers<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u5c06\u5b50\u8fdb\u7a0b\u52a0\u5165\u540c\u4e00\u8fdb\u7a0b\u7ec4<\/span><br \/>\n            <span class=\"token class-name\">pid_t<\/span> group_id <span class=\"token operator\">&#061;<\/span> workers<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u4f7f\u7528\u7b2c\u4e00\u4e2a\u5b50\u8fdb\u7a0b\u7684PID\u4f5c\u4e3a\u7ec4ID<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">setpgid<\/span><span class=\"token punctuation\">(<\/span>workers<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> group_id<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u5de5\u4f5c\u8fdb\u7a0b %d \u52a0\u5165\u8fdb\u7a0b\u7ec4: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> workers<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> group_id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u5de5\u4f5c\u8fdb\u7a0b %d \u52a0\u5165\u8fdb\u7a0b\u7ec4\u5931\u8d25: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> workers<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u521b\u5efa\u5de5\u4f5c\u8fdb\u7a0b\u5931\u8d25&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u6e05\u7406\u5df2\u521b\u5efa\u7684\u8fdb\u7a0b<\/span><br \/>\n            <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> j <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> j <span class=\"token operator\">&lt;<\/span> i<span class=\"token punctuation\">;<\/span> j<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token function\">kill<\/span><span class=\"token punctuation\">(<\/span>workers<span class=\"token punctuation\">[<\/span>j<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> SIGKILL<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u663e\u793a\u8fdb\u7a0b\u7ec4\u4fe1\u606f<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\\\\n2. \u8fdb\u7a0b\u7ec4\u4fe1\u606f:\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">pid_t<\/span> pgid <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getpgid<\/span><span class=\"token punctuation\">(<\/span>workers<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u5de5\u4f5c\u8fdb\u7a0b %d (PID&#061;%d) \u8fdb\u7a0b\u7ec4: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> i <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> workers<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> pgid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7b49\u5f85\u4e00\u6bb5\u65f6\u95f4\u540e\u53d1\u9001\u4fe1\u53f7<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\\\\n3. \u7b49\u5f855\u79d2\u540e\u53d1\u9001\u4fe1\u53f7\u5230\u8fdb\u7a0b\u7ec4&#8230;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5411\u8fdb\u7a0b\u7ec4\u53d1\u9001\u4fe1\u53f7&#xff08;\u53d1\u9001\u7ed9\u7ec4\u5185\u6240\u6709\u8fdb\u7a0b&#xff09;<\/span><br \/>\n    <span class=\"token class-name\">pid_t<\/span> target_group <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getpgid<\/span><span class=\"token punctuation\">(<\/span>workers<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5411\u8fdb\u7a0b\u7ec4 %d \u53d1\u9001 SIGUSR1 \u4fe1\u53f7\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> target_group<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">kill<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span>target_group<span class=\"token punctuation\">,<\/span> SIGUSR1<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>  <span class=\"token comment\">\/\/ \u8d1f\u6570\u8868\u793a\u53d1\u9001\u7ed9\u6574\u4e2a\u8fdb\u7a0b\u7ec4<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u2713 \u6210\u529f\u53d1\u9001\u4fe1\u53f7\u5230\u8fdb\u7a0b\u7ec4\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u2717 \u53d1\u9001\u4fe1\u53f7\u5931\u8d25: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7b49\u5f85\u4e00\u6bb5\u65f6\u95f4\u89c2\u5bdf\u4fe1\u53f7\u5904\u7406<\/span><br \/>\n    <span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u53d1\u9001\u7ec8\u6b62\u4fe1\u53f7<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\\\\n4. \u53d1\u9001\u7ec8\u6b62\u4fe1\u53f7:\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5411\u8fdb\u7a0b\u7ec4 %d \u53d1\u9001 SIGTERM \u4fe1\u53f7\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> target_group<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">kill<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span>target_group<span class=\"token punctuation\">,<\/span> SIGTERM<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u2713 \u6210\u529f\u53d1\u9001\u7ec8\u6b62\u4fe1\u53f7\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u2717 \u53d1\u9001\u7ec8\u6b62\u4fe1\u53f7\u5931\u8d25: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7b49\u5f85\u6240\u6709\u5de5\u4f5c\u8fdb\u7a0b\u7ed3\u675f<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\\\\n5. \u7b49\u5f85\u5de5\u4f5c\u8fdb\u7a0b\u7ed3\u675f:\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> status<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">pid_t<\/span> finished_pid<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> finished_count <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>finished_count <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        finished_pid <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">wait<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>status<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>finished_pid <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            finished_count<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u5de5\u4f5c\u8fdb\u7a0b %d \u5df2\u7ed3\u675f&#xff0c;\u9000\u51fa\u72b6\u6001: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                   finished_pid<span class=\"token punctuation\">,<\/span> <span class=\"token function\">WEXITSTATUS<\/span><span class=\"token punctuation\">(<\/span>status<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6240\u6709\u5de5\u4f5c\u8fdb\u7a0b\u5df2\u5b8c\u6210\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token function\">demo_process_group_signaling<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>\u793a\u4f8b4&#xff1a;\u4f1a\u8bdd\u548c\u8fdb\u7a0b\u7ec4\u7ba1\u7406<\/h4>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdlib.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;string.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;errno.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/wait.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;signal.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token comment\">\/**<br \/>\n * \u663e\u793a\u4f1a\u8bdd\u548c\u8fdb\u7a0b\u7ec4\u4fe1\u606f<br \/>\n *\/<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">show_session_info<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#061;&#061;&#061; \u4f1a\u8bdd\u548c\u8fdb\u7a0b\u7ec4\u4fe1\u606f &#061;&#061;&#061;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8fdb\u7a0bID: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getpid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7236\u8fdb\u7a0bID: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getppid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8fdb\u7a0b\u7ec4ID: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getpgid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u4f1a\u8bddID: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getsid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u524d\u53f0\u8fdb\u7a0b\u7ec4: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">tcgetpgrp<\/span><span class=\"token punctuation\">(<\/span>STDIN_FILENO<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/**<br \/>\n * \u4f1a\u8bdd\u9886\u5bfc\u8fdb\u7a0b<br \/>\n *\/<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">session_leader<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u4f1a\u8bdd\u9886\u5bfc\u8fdb\u7a0b\u542f\u52a8 (PID: %d)\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getpid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">show_session_info<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521b\u5efa\u65b0\u4f1a\u8bdd<\/span><br \/>\n    <span class=\"token class-name\">pid_t<\/span> sid <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">setsid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>sid <span class=\"token operator\">!&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u2713 \u6210\u529f\u521b\u5efa\u65b0\u4f1a\u8bdd: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> sid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">show_session_info<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u2717 \u521b\u5efa\u65b0\u4f1a\u8bdd\u5931\u8d25: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521b\u5efa\u5b50\u8fdb\u7a0b\u7ec4<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">pid_t<\/span> child_pid <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">fork<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>child_pid <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u5b50\u8fdb\u7a0b<\/span><br \/>\n            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5b50\u8fdb\u7a0b %d \u542f\u52a8\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getpid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u521b\u5efa\u81ea\u5df1\u7684\u8fdb\u7a0b\u7ec4<\/span><br \/>\n            <span class=\"token class-name\">pid_t<\/span> new_pgid <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getpid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">setpgid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> new_pgid<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5b50\u8fdb\u7a0b %d \u6210\u529f\u521b\u5efa\u8fdb\u7a0b\u7ec4: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getpid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> new_pgid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u6a21\u62df\u5de5\u4f5c<\/span><br \/>\n            <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> j <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> j <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">;<\/span> j<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5b50\u8fdb\u7a0b %d \u5de5\u4f5c\u4e2d&#8230; (%d\/5)\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getpid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> j <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5b50\u8fdb\u7a0b %d \u7ed3\u675f\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">getpid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>child_pid <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u4f1a\u8bdd\u9886\u5bfc\u8fdb\u7a0b\u521b\u5efa\u5b50\u8fdb\u7a0b: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> child_pid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u5c06\u5b50\u8fdb\u7a0b\u52a0\u5165\u7279\u5b9a\u8fdb\u7a0b\u7ec4<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">setpgid<\/span><span class=\"token punctuation\">(<\/span>child_pid<span class=\"token punctuation\">,<\/span> child_pid<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5b50\u8fdb\u7a0b %d \u52a0\u5165\u8fdb\u7a0b\u7ec4\u6210\u529f\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> child_pid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7b49\u5f85\u5b50\u8fdb\u7a0b\u7ed3\u675f<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> status<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">pid_t<\/span> finished_pid<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>finished_pid <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">wait<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>status<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5b50\u8fdb\u7a0b %d \u5df2\u7ed3\u675f\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> finished_pid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u4f1a\u8bdd\u9886\u5bfc\u8fdb\u7a0b\u7ed3\u675f\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/**<br \/>\n * \u6f14\u793a\u4f1a\u8bdd\u548c\u8fdb\u7a0b\u7ec4\u7ba1\u7406<br \/>\n *\/<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">demo_session_management<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">pid_t<\/span> session_leader_pid<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#061;&#061;&#061; \u4f1a\u8bdd\u548c\u8fdb\u7a0b\u7ec4\u7ba1\u7406\u6f14\u793a &#061;&#061;&#061;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u663e\u793a\u521d\u59cb\u4fe1\u606f<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;1. \u521d\u59cb\u8fdb\u7a0b\u4fe1\u606f:\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">show_session_info<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521b\u5efa\u4f1a\u8bdd\u9886\u5bfc\u8fdb\u7a0b<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;2. \u521b\u5efa\u4f1a\u8bdd\u9886\u5bfc\u8fdb\u7a0b:\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    session_leader_pid <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">fork<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>session_leader_pid <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">session_leader<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>session_leader_pid <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u4e3b\u8fdb\u7a0b\u521b\u5efa\u4f1a\u8bdd\u9886\u5bfc\u8fdb\u7a0b: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> session_leader_pid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u7b49\u5f85\u4f1a\u8bdd\u9886\u5bfc\u8fdb\u7a0b\u7ed3\u675f<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> status<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">waitpid<\/span><span class=\"token punctuation\">(<\/span>session_leader_pid<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>status<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u4f1a\u8bdd\u9886\u5bfc\u8fdb\u7a0b\u5df2\u7ed3\u675f\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u521b\u5efa\u4f1a\u8bdd\u9886\u5bfc\u8fdb\u7a0b\u5931\u8d25&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u663e\u793a\u6700\u7ec8\u4fe1\u606f<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\\\\n3. \u6700\u7ec8\u8fdb\u7a0b\u4fe1\u606f:\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">show_session_info<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token function\">demo_session_management<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>\u793a\u4f8b5&#xff1a;\u4f5c\u4e1a\u63a7\u5236\u6f14\u793a<\/h4>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdlib.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;string.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;errno.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/wait.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;signal.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token comment\">\/**<br \/>\n * \u540e\u53f0\u4f5c\u4e1a\u8fdb\u7a0b<br \/>\n *\/<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">background_job<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> job_id<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u540e\u53f0\u4f5c\u4e1a %d \u542f\u52a8 (PID: %d)\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> job_id<span class=\"token punctuation\">,<\/span> <span class=\"token function\">getpid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521b\u5efa\u72ec\u7acb\u7684\u8fdb\u7a0b\u7ec4<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">setpgid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u540e\u53f0\u4f5c\u4e1a %d \u6210\u529f\u521b\u5efa\u8fdb\u7a0b\u7ec4\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> job_id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u540e\u53f0\u4f5c\u4e1a %d \u521b\u5efa\u8fdb\u7a0b\u7ec4\u5931\u8d25: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> job_id<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6a21\u62df\u957f\u65f6\u95f4\u8fd0\u884c\u7684\u4f5c\u4e1a<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u540e\u53f0\u4f5c\u4e1a %d \u8fd0\u884c\u4e2d&#8230; (%d\/20)\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> job_id<span class=\"token punctuation\">,<\/span> i <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u68c0\u67e5\u662f\u5426\u6536\u5230\u7ec8\u6b62\u4fe1\u53f7<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>i <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u6a21\u62df\u4f5c\u4e1a\u6682\u505c\u548c\u6062\u590d<\/span><br \/>\n            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u540e\u53f0\u4f5c\u4e1a %d \u6682\u505c\u5de5\u4f5c\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> job_id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u540e\u53f0\u4f5c\u4e1a %d \u6062\u590d\u5de5\u4f5c\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> job_id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u540e\u53f0\u4f5c\u4e1a %d \u5b8c\u6210\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> job_id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/**<br \/>\n * \u4f5c\u4e1a\u63a7\u5236\u7ba1\u7406\u5668<br \/>\n *\/<\/span><br \/>\n<span class=\"token keyword\">typedef<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">pid_t<\/span> pid<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> job_id<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> status<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ 0:\u8fd0\u884c, 1:\u6682\u505c, 2:\u5b8c\u6210<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> command<span class=\"token punctuation\">[<\/span><span class=\"token number\">256<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> <span class=\"token class-name\">job_t<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/**<br \/>\n * \u663e\u793a\u4f5c\u4e1a\u5217\u8868<br \/>\n *\/<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">show_job_list<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">job_t<\/span> <span class=\"token operator\">*<\/span>jobs<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> count<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\\\\n&#061;&#061;&#061; \u4f5c\u4e1a\u5217\u8868 &#061;&#061;&#061;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%-5s %-8s %-10s %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u4f5c\u4e1aID&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u8fdb\u7a0bID&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u72b6\u6001&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u547d\u4ee4&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> count<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>status_str<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">switch<\/span> <span class=\"token punctuation\">(<\/span>jobs<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>status<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">case<\/span> <span class=\"token number\">0<\/span><span class=\"token operator\">:<\/span> status_str <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\u8fd0\u884c&#034;<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">case<\/span> <span class=\"token number\">1<\/span><span class=\"token operator\">:<\/span> status_str <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\u6682\u505c&#034;<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">case<\/span> <span class=\"token number\">2<\/span><span class=\"token operator\">:<\/span> status_str <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\u5b8c\u6210&#034;<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">default<\/span><span class=\"token operator\">:<\/span> status_str <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\u672a\u77e5&#034;<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%-5d %-8d %-10s %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n               jobs<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>job_id<span class=\"token punctuation\">,<\/span> jobs<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>pid<span class=\"token punctuation\">,<\/span> status_str<span class=\"token punctuation\">,<\/span> jobs<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>command<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/**<br \/>\n * \u6f14\u793a\u4f5c\u4e1a\u63a7\u5236<br \/>\n *\/<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">demo_job_control<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">job_t<\/span> jobs<span class=\"token punctuation\">[<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> job_count <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#061;&#061;&#061; \u4f5c\u4e1a\u63a7\u5236\u6f14\u793a &#061;&#061;&#061;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521b\u5efa\u540e\u53f0\u4f5c\u4e1a<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;1. \u521b\u5efa\u540e\u53f0\u4f5c\u4e1a:\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">pid_t<\/span> job_pid <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">fork<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>job_pid <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">background_job<\/span><span class=\"token punctuation\">(<\/span>i <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>job_pid <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u7236\u8fdb\u7a0b\u8bb0\u5f55\u4f5c\u4e1a\u4fe1\u606f<\/span><br \/>\n            jobs<span class=\"token punctuation\">[<\/span>job_count<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>pid <span class=\"token operator\">&#061;<\/span> job_pid<span class=\"token punctuation\">;<\/span><br \/>\n            jobs<span class=\"token punctuation\">[<\/span>job_count<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>job_id <span class=\"token operator\">&#061;<\/span> i <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            jobs<span class=\"token punctuation\">[<\/span>job_count<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>status <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u8fd0\u884c\u4e2d<\/span><br \/>\n            <span class=\"token function\">snprintf<\/span><span class=\"token punctuation\">(<\/span>jobs<span class=\"token punctuation\">[<\/span>job_count<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>command<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>jobs<span class=\"token punctuation\">[<\/span>job_count<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>command<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                     <span class=\"token string\">&#034;background_job_%d&#034;<\/span><span class=\"token punctuation\">,<\/span> i <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            job_count<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u521b\u5efa\u540e\u53f0\u4f5c\u4e1a %d: PID&#061;%d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> i <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> job_pid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u5c06\u5b50\u8fdb\u7a0b\u52a0\u5165\u72ec\u7acb\u8fdb\u7a0b\u7ec4<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">setpgid<\/span><span class=\"token punctuation\">(<\/span>job_pid<span class=\"token punctuation\">,<\/span> job_pid<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u4f5c\u4e1a %d \u6210\u529f\u521b\u5efa\u72ec\u7acb\u8fdb\u7a0b\u7ec4\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> i <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u521b\u5efa\u540e\u53f0\u4f5c\u4e1a\u5931\u8d25&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u663e\u793a\u521d\u59cb\u4f5c\u4e1a\u5217\u8868<\/span><br \/>\n    <span class=\"token function\">show_job_list<\/span><span class=\"token punctuation\">(<\/span>jobs<span class=\"token punctuation\">,<\/span> job_count<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6f14\u793a\u5411\u7279\u5b9a\u4f5c\u4e1a\u53d1\u9001\u4fe1\u53f7<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;2. \u5411\u4f5c\u4e1a\u53d1\u9001\u4fe1\u53f7:\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>job_count <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u5411\u4f5c\u4e1a 1 (PID&#061;%d) \u53d1\u9001 SIGUSR1 \u4fe1\u53f7\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> jobs<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>pid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">kill<\/span><span class=\"token punctuation\">(<\/span>jobs<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>pid<span class=\"token punctuation\">,<\/span> SIGUSR1<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u2713 \u4fe1\u53f7\u53d1\u9001\u6210\u529f\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u2717 \u4fe1\u53f7\u53d1\u9001\u5931\u8d25: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7b49\u5f85\u4e00\u6bb5\u65f6\u95f4<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\\\\n3. \u7b49\u5f85\u4f5c\u4e1a\u8fd0\u884c&#8230;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u663e\u793a\u5f53\u524d\u4f5c\u4e1a\u72b6\u6001<\/span><br \/>\n    <span class=\"token function\">show_job_list<\/span><span class=\"token punctuation\">(<\/span>jobs<span class=\"token punctuation\">,<\/span> job_count<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6f14\u793a\u4f5c\u4e1a\u63a7\u5236\u64cd\u4f5c<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;4. \u4f5c\u4e1a\u63a7\u5236\u64cd\u4f5c:\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6682\u505c\u4e00\u4e2a\u4f5c\u4e1a<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>job_count <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u6682\u505c\u4f5c\u4e1a 2 (PID&#061;%d)\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> jobs<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>pid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">kill<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token function\">getpgid<\/span><span class=\"token punctuation\">(<\/span>jobs<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>pid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> SIGSTOP<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>  <span class=\"token comment\">\/\/ \u53d1\u9001\u7ed9\u6574\u4e2a\u8fdb\u7a0b\u7ec4<\/span><br \/>\n            jobs<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>status <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u6682\u505c<\/span><br \/>\n            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u2713 \u4f5c\u4e1a 2 \u5df2\u6682\u505c\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u2717 \u6682\u505c\u4f5c\u4e1a 2 \u5931\u8d25: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u663e\u793a\u66f4\u65b0\u540e\u7684\u4f5c\u4e1a\u5217\u8868<\/span><br \/>\n    <span class=\"token function\">show_job_list<\/span><span class=\"token punctuation\">(<\/span>jobs<span class=\"token punctuation\">,<\/span> job_count<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6062\u590d\u6682\u505c\u7684\u4f5c\u4e1a<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>job_count <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u6062\u590d\u4f5c\u4e1a 2 (PID&#061;%d)\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> jobs<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>pid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">kill<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token function\">getpgid<\/span><span class=\"token punctuation\">(<\/span>jobs<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>pid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> SIGCONT<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            jobs<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>status <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u8fd0\u884c\u4e2d<\/span><br \/>\n            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u2713 \u4f5c\u4e1a 2 \u5df2\u6062\u590d\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u2717 \u6062\u590d\u4f5c\u4e1a 2 \u5931\u8d25: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span>errno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7b49\u5f85\u6240\u6709\u4f5c\u4e1a\u5b8c\u6210<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\\\\n5. \u7b49\u5f85\u6240\u6709\u4f5c\u4e1a\u5b8c\u6210:\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> completed_jobs <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>completed_jobs <span class=\"token operator\">&lt;<\/span> job_count<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> status<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">pid_t<\/span> finished_pid <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">waitpid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>status<span class=\"token punctuation\">,<\/span> WNOHANG<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>finished_pid <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u627e\u5230\u5b8c\u6210\u7684\u4f5c\u4e1a\u5e76\u66f4\u65b0\u72b6\u6001<\/span><br \/>\n            <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> job_count<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>jobs<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>pid <span class=\"token operator\">&#061;&#061;<\/span> finished_pid<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    jobs<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>status <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5b8c\u6210<\/span><br \/>\n                    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  \u4f5c\u4e1a %d (PID&#061;%d) \u5df2\u5b8c\u6210\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> jobs<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>job_id<span class=\"token punctuation\">,<\/span> finished_pid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    completed_jobs<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>finished_pid <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u6ca1\u6709\u4f5c\u4e1a\u5b8c\u6210&#xff0c;\u77ed\u6682\u7b49\u5f85<\/span><br \/>\n            <span class=\"token function\">usleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">100000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ 100ms<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u9519\u8bef<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>errno <span class=\"token operator\">!&#061;<\/span> ECHILD<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7b49\u5f85\u4f5c\u4e1a\u5b8c\u6210\u65f6\u51fa\u9519&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u663e\u793a\u6700\u7ec8\u4f5c\u4e1a\u5217\u8868<\/span><br \/>\n    <span class=\"token function\">show_job_list<\/span><span class=\"token punctuation\">(<\/span>jobs<span class=\"token punctuation\">,<\/span> job_count<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u4f5c\u4e1a\u63a7\u5236\u6f14\u793a\u5b8c\u6210\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token function\">demo_job_control<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>setpgid \u4f7f\u7528\u6ce8\u610f\u4e8b\u9879<\/h3>\n<h4>\u7cfb\u7edf\u8981\u6c42&#xff1a;<\/h4>\n<p>1. \u5185\u6838\u7248\u672c: \u652f\u6301\u8fdb\u7a0b\u7ec4\u7ba1\u7406\u7684Linux\u5185\u6838 2. \u6743\u9650\u8981\u6c42: \u901a\u5e38\u4e0d\u9700\u8981\u7279\u6b8a\u6743\u9650 3. \u67b6\u6784\u652f\u6301: \u652f\u6301\u6240\u6709\u4e3b\u6d41\u67b6\u6784<\/p>\n<h4>\u53c2\u6570\u89c4\u5219&#xff1a;<\/h4>\n<p>1. pid\u4e3a0: \u8868\u793a\u5f53\u524d\u8fdb\u7a0b 2. pgid\u4e3a0: \u8868\u793a\u4f7f\u7528pid\u4f5c\u4e3a\u8fdb\u7a0b\u7ec4ID 3. \u8fdb\u7a0b\u9650\u5236: \u53ea\u80fd\u64cd\u4f5c\u5f53\u524d\u4f1a\u8bdd\u4e2d\u7684\u8fdb\u7a0b 4. \u4f1a\u8bdd\u9650\u5236: \u4e0d\u80fd\u5c06\u8fdb\u7a0b\u79fb\u5230\u4e0d\u540c\u4f1a\u8bdd\u7684\u8fdb\u7a0b\u7ec4<\/p>\n<h4>\u9519\u8bef\u5904\u7406&#xff1a;<\/h4>\n<p>1. EACCES: \u4e0d\u5141\u8bb8\u4ece\u4f1a\u8bdd\u9886\u5bfc\u8fdb\u7a0b\u66f4\u6539\u8fdb\u7a0b\u7ec4 2. EINVAL: \u8fdb\u7a0bID\u6216\u8fdb\u7a0b\u7ec4ID\u65e0\u6548 3. EPERM: \u6743\u9650\u4e0d\u8db3 4. ESRCH: \u6307\u5b9a\u7684\u8fdb\u7a0b\u4e0d\u5b58\u5728<\/p>\n<h4>\u6027\u80fd\u8003\u8651&#xff1a;<\/h4>\n<p>1. \u7cfb\u7edf\u8c03\u7528\u5f00\u9500: \u9891\u7e41\u8c03\u7528\u6709\u6027\u80fd\u5f00\u9500 2. \u5185\u6838\u6570\u636e\u7ed3\u6784: \u9700\u8981\u66f4\u65b0\u5185\u6838\u4e2d\u7684\u8fdb\u7a0b\u7ec4\u4fe1\u606f 3. \u540c\u6b65\u64cd\u4f5c: \u6d89\u53ca\u5185\u6838\u6570\u636e\u7ed3\u6784\u7684\u540c\u6b65\u66f4\u65b0<\/p>\n<h4>\u5b89\u5168\u8003\u8651&#xff1a;<\/h4>\n<p>1. \u8fdb\u7a0b\u63a7\u5236: \u53ef\u80fd\u5f71\u54cd\u5176\u4ed6\u8fdb\u7a0b\u7684\u884c\u4e3a 2. \u4fe1\u53f7\u4f20\u64ad: \u8fdb\u7a0b\u7ec4\u4fe1\u53f7\u4f1a\u5f71\u54cd\u7ec4\u5185\u6240\u6709\u8fdb\u7a0b 3. \u4f1a\u8bdd\u7ba1\u7406: \u4e0d\u5f53\u7684\u4f1a\u8bdd\u64cd\u4f5c\u53ef\u80fd\u5f71\u54cd\u7ec8\u7aef\u63a7\u5236<\/p>\n<h4>\u6700\u4f73\u5b9e\u8df5&#xff1a;<\/h4>\n<p>1. \u65f6\u673a\u9009\u62e9: \u5728\u8fdb\u7a0b\u521b\u5efa\u540e\u5c3d\u65e9\u8bbe\u7f6e\u8fdb\u7a0b\u7ec4 2. \u9519\u8bef\u5904\u7406: \u59a5\u5584\u5904\u7406\u5404\u79cd\u9519\u8bef\u60c5\u51b5 3. \u72b6\u6001\u68c0\u67e5: \u9a8c\u8bc1\u8bbe\u7f6e\u7ed3\u679c\u7684\u6b63\u786e\u6027 4. \u8d44\u6e90\u6e05\u7406: \u53ca\u65f6\u6e05\u7406\u4e0d\u9700\u8981\u7684\u8fdb\u7a0b\u7ec4 5. \u6587\u6863\u8bb0\u5f55: \u8bb0\u5f55\u8fdb\u7a0b\u7ec4\u7ba1\u7406\u7b56\u7565<\/p>\n<h3>\u8fdb\u7a0b\u7ec4\u548c\u4f1a\u8bdd\u6982\u5ff5<\/h3>\n<h4>\u8fdb\u7a0b\u7ec4&#xff08;Process Group&#xff09;&#xff1a;<\/h4>\n<ul>\n<li>\u5b9a\u4e49: \u4e00\u7ec4\u76f8\u5173\u8fdb\u7a0b\u7684\u96c6\u5408<\/li>\n<li>\u7528\u9014: \u4fe1\u53f7\u5206\u53d1\u3001\u4f5c\u4e1a\u63a7\u5236<\/li>\n<li>\u7279\u70b9: \u540c\u4e00\u8fdb\u7a0b\u7ec4\u7684\u8fdb\u7a0b\u53ef\u4ee5\u88ab\u7edf\u4e00\u63a7\u5236<\/li>\n<\/ul>\n<h4>\u4f1a\u8bdd&#xff08;Session&#xff09;&#xff1a;<\/h4>\n<ul>\n<li>\u5b9a\u4e49: \u4e00\u4e2a\u6216\u591a\u4e2a\u8fdb\u7a0b\u7ec4\u7684\u96c6\u5408<\/li>\n<li>\u7528\u9014: \u7ec8\u7aef\u63a7\u5236\u3001\u767b\u5f55\u4f1a\u8bdd\u7ba1\u7406<\/li>\n<li>\u7279\u70b9: \u4f1a\u8bdd\u9886\u5bfc\u8fdb\u7a0b\u63a7\u5236\u6574\u4e2a\u4f1a\u8bdd<\/li>\n<\/ul>\n<h4>\u5173\u7cfb\u5c42\u6b21&#xff1a;<\/h4>\n<p>\u4f1a\u8bdd (Session)<br \/>\n\u2514\u2500\u2500 \u8fdb\u7a0b\u7ec4 (Process Group)<br \/>\n    \u2514\u2500\u2500 \u8fdb\u7a0b (Process)<\/p>\n<h3>\u5e38\u89c1\u4f7f\u7528\u573a\u666f<\/h3>\n<h4>1. Shell\u4f5c\u4e1a\u63a7\u5236&#xff1a;<\/h4>\n<p><span class=\"token comment\">\/\/ \u521b\u5efa\u540e\u53f0\u4f5c\u4e1a\u7684\u72ec\u7acb\u8fdb\u7a0b\u7ec4<\/span><br \/>\n<span class=\"token function\">setpgid<\/span><span class=\"token punctuation\">(<\/span>child_pid<span class=\"token punctuation\">,<\/span> child_pid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>2. \u5b88\u62a4\u8fdb\u7a0b&#xff1a;<\/h4>\n<p><span class=\"token comment\">\/\/ \u521b\u5efa\u72ec\u7acb\u4f1a\u8bdd&#xff0c;\u8131\u79bb\u63a7\u5236\u7ec8\u7aef<\/span><br \/>\n<span class=\"token function\">setsid<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>3. \u591a\u8fdb\u7a0b\u5e94\u7528&#xff1a;<\/h4>\n<p><span class=\"token comment\">\/\/ \u5c06\u76f8\u5173\u8fdb\u7a0b\u7ec4\u7ec7\u5230\u540c\u4e00\u8fdb\u7a0b\u7ec4<\/span><br \/>\n<span class=\"token function\">setpgid<\/span><span class=\"token punctuation\">(<\/span>worker_pid<span class=\"token punctuation\">,<\/span> group_leader_pid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>\u4fe1\u53f7\u4e0e\u8fdb\u7a0b\u7ec4<\/h3>\n<h4>\u7ec4\u4fe1\u53f7\u53d1\u9001&#xff1a;<\/h4>\n<p><span class=\"token comment\">\/\/ \u5411\u6574\u4e2a\u8fdb\u7a0b\u7ec4\u53d1\u9001\u4fe1\u53f7<\/span><br \/>\n<span class=\"token function\">kill<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span>pgid<span class=\"token punctuation\">,<\/span> SIGTERM<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>\u524d\u53f0\u8fdb\u7a0b\u7ec4&#xff1a;<\/h4>\n<p><span class=\"token comment\">\/\/ \u8bbe\u7f6e\u524d\u53f0\u8fdb\u7a0b\u7ec4&#xff08;\u63a7\u5236\u7ec8\u7aef&#xff09;<\/span><br \/>\n<span class=\"token function\">tcsetpgrp<\/span><span class=\"token punctuation\">(<\/span>STDIN_FILENO<span class=\"token punctuation\">,<\/span> pgid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>\u603b\u7ed3<\/h3>\n<p>setpgid \u662fLinux\u7cfb\u7edf\u4e2d\u91cd\u8981\u7684\u8fdb\u7a0b\u7ba1\u7406\u51fd\u6570&#xff0c;\u63d0\u4f9b\u4e86&#xff1a;<\/p>\n<p>1. \u8fdb\u7a0b\u7ec4\u63a7\u5236: \u7075\u6d3b\u7684\u8fdb\u7a0b\u7ec4\u7ba1\u7406\u80fd\u529b 2. \u4f5c\u4e1a\u63a7\u5236: \u652f\u6301shell\u98ce\u683c\u7684\u4f5c\u4e1a\u63a7\u5236 3. \u4fe1\u53f7\u7ba1\u7406: \u4fbf\u4e8e\u5411\u8fdb\u7a0b\u7ec4\u53d1\u9001\u4fe1\u53f7 4. \u4f1a\u8bdd\u7ba1\u7406: \u652f\u6301\u4f1a\u8bdd\u548c\u7ec8\u7aef\u63a7\u5236<\/p>\n<p>\u901a\u8fc7\u5408\u7406\u4f7f\u7528 setpgid&#xff0c;\u53ef\u4ee5\u6784\u5efa\u66f4\u52a0\u7075\u6d3b\u548c\u53ef\u63a7\u7684\u591a\u8fdb\u7a0b\u5e94\u7528\u7a0b\u5e8f\u3002\u5728\u5b9e\u9645\u5e94\u7528\u4e2d&#xff0c;\u9700\u8981\u6ce8\u610f\u8fdb\u7a0b\u7ec4\u7684\u751f\u547d\u5468\u671f\u7ba1\u7406\u3001\u9519\u8bef\u5904\u7406\u548c\u4fe1\u53f7\u63a7\u5236\u7b49\u5173\u952e\u95ee\u9898\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb965\u6b21\uff0c\u70b9\u8d5e20\u6b21\uff0c\u6536\u85cf14\u6b21\u3002setpgid\u662fLinux\u7cfb\u7edf\u8c03\u7528\uff0c\u7528\u4e8e\u8bbe\u7f6e\u8fdb\u7a0b\u7684\u8fdb\u7a0b\u7ec4ID\u3002\u5176\u539f\u578b\u4e3aint setpgid(pid_t pid, pid_t pgid)\uff0c\u53ef\u5c06\u6307\u5b9a\u8fdb\u7a0b\u52a0\u5165\u6307\u5b9a\u8fdb\u7a0b\u7ec4\uff08\u82e5\u7ec4\u4e0d\u5b58\u5728\u5219\u521b\u5efa\uff09\u3002\u4e3b\u8981\u53c2\u6570\uff1apid\uff080\u8868\u793a\u5f53\u524d\u8fdb\u7a0b\uff09\u548cpgid\uff080\u8868\u793a\u4f7f\u7528pid\u4f5c\u4e3a\u7ec4ID\uff09\u3002\u6210\u529f\u8fd4\u56de0\uff0c\u5931\u8d25\u8fd4\u56de-1\u5e76\u8bbe\u7f6eerrno\u3002\u5173\u8054\u51fd\u6570\u5305\u62ecgetpgid\u3001setpgrp\u3001getsid\u548csetsid\u3002\u793a\u4f8b\u5c55\u793a\u4e86\u57fa\u672c\u7528\u6cd5\uff08\u521b\u5efa\u65b0\u8fdb\u7a0b\u7ec4\uff09\u548c\u7236\u5b50\u8fdb\u7a0b\u7ec4\u7ba1\u7406\uff08\u7236\u8fdb\u7a0b\u4e0e\u4e24\u4e2a\u5b50\u8fdb\u7a0b\u5404\u81ea\u521b\u5efa\u72ec\u7acb\u8fdb\u7a0b\u7ec4\uff09\u3002\u8be5\u51fd\u6570\u5e38\u7528\u4e8e\u4f5c\u4e1a\u63a7\u5236\u548c\u4fe1\u53f7\u7ba1\u7406\uff0c\u662f\u8fdb\u7a0b\u7ec4\u7ec7<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[58,5708,43],"topic":[],"class_list":{"0":"post-55460","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-server","7":"tag-linux","9":"tag-43"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - 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