{"id":120611,"date":"2026-10-31T23:47:27","date_gmt":"2026-10-31T15:47:27","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/120611.html"},"modified":"2026-10-31T23:47:27","modified_gmt":"2026-10-31T15:47:27","slug":"linux%e7%b3%bb%e7%bb%9f-%e8%bf%9b%e7%a8%8b%e4%bf%a1%e5%8f%b7%e4%b9%8b%e4%bf%9d%e5%ad%98%e5%92%8c%e6%8d%95%e6%8d%89%e4%bf%a1%e5%8f%b7","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/120611.html","title":{"rendered":"Linux\u7cfb\u7edf\u2014\u2014\u8fdb\u7a0b\u4fe1\u53f7\u4e4b\u4fdd\u5b58\u548c\u6355\u6349\u4fe1\u53f7"},"content":{"rendered":"

\u00a0\u00a0💁\u200d\u2642\ufe0f\u4e2a\u4eba\u4e3b\u9875：\u8fdb\u51fb\u7684\u8346\u68d8<\/p>\n

👇\u4f5c\u8005\u5176\u5b83\u4e13\u680f：<\/p>\n

\u300a\u6570\u636e\u7ed3\u6784\u4e0e\u7b97\u6cd5\u300b\u300a\u7b97\u6cd5\u300b\u300aC++\u8d77\u59cb\u4e4b\u8def\u300b\u300aLinux\u300b<\/p>\n

\n

\u76ee\u5f55<\/h2>\n

1.\u4fe1\u53f7\u524d\u5bfc<\/h2>\n

2.\u4ea7\u751f\u4fe1\u53f7<\/h2>\n

3.\u4fdd\u5b58\u4fe1\u53f7<\/h2>\n

4.\u6355\u6349\u4fe1\u53f7<\/h2>\n

5.\u53ef\u91cd\u5165\u51fd\u6570<\/h2>\n

6.volatile<\/h2>\n

7.SIGCHLD\u4fe1\u53f7<\/h2>\n

8.\u9644\u5f55<\/h2>\n
\n

3.\u4fdd\u5b58\u4fe1\u53f7<\/h2>\n

\"\"<\/p>\n

3.1\u4fe1\u53f7\u76f8\u5173\u6982\u5ff5<\/h3>\n

\u25cf\u5b9e\u9645\u6267\u884c\u4fe1\u53f7\u7684\u5904\u7406\u52a8\u4f5c\u79f0\u4e3a\u4fe1\u53f7\u9012\u8fbe（Delivery）<\/p>\n

\u25cf\u4fe1\u53f7\u4ece\u4ea7\u751f\u5230\u9012\u8fbe\u4e4b\u95f4\u7684\u72b6\u6001，\u79f0\u4e3a\u4fe1\u53f7\u672a\u51b3（Pending）<\/p>\n

\u25cf\u8fdb\u7a0b\u53ef\u4ee5\u9009\u62e9\u963b\u585e（Block）\u67d0\u4e2a\u4fe1\u53f7<\/p>\n

\u25cf\u88ab\u963b\u585e\u7684\u4fe1\u53f7\u4ea7\u751f\u65f6\u5c06\u4fdd\u6301\u5728\u672a\u51b3\u72b6\u6001，\u76f4\u5230\u8fdb\u7a0b\u63a5\u89e6\u5bf9\u6b64\u4fe1\u53f7\u7684\u963b\u585e，\u624d\u4f1a\u6267\u884c\u9012\u8fbe\u7684\u52a8\u4f5c<\/p>\n

\u25cf\u6ce8，\u963b\u585e\u548c\u5ffd\u7565\u662f\u4e0d\u540c\u7684，\u53ea\u6709\u4fe1\u53f7\u88ab\u963b\u585e\u5c31\u4e0d\u4f1a\u9012\u8fbe，\u800c\u5ffd\u7565\u662f\u5728\u9012\u8fbe\u4e4b\u540e\u53ef\u9009\u7684\u4e00\u79cd\u5904\u7406\u52a8\u4f5c<\/p>\n

3.2\u5728\u5185\u6838\u4e2d\u7684\u8868\u793a<\/h3>\n

\u4fe1\u53f7\u5728\u5185\u6838\u4e2d\u7684\u8868\u793a\u793a\u610f\u56fe<\/p>\n

\"\"<\/p>\n

\u25cf\u6bcf\u4e2a\u4fe1\u53f7\u90fd\u6709\u4e24\u4e2a\u6807\u5fd7\u4f4d\u5206\u522b\u8868\u793a\u963b\u585e（block）\u548c\u672a\u51b3（pending），\u8fd8\u6709\u4e00\u4e2a\u51fd\u6570\u6307\u9488\u8868\u793a\u5904\u7406\u52a8\u4f5c\u3002\u4fe1\u53f7\u4ea7\u751f\u65f6，\u5185\u6838\u5728\u8fdb\u7a0b\u63a7\u5236\u5757\u4e2d\u8bbe\u7f6e\u8be5\u4fe1\u53f7\u7684\u672a\u51b3\u6807\u5fd7，\u76f4\u5230\u4fe1\u53f7\u9012\u8fbe\u624d\u6e05\u9664\u8be5\u6807\u5fd7\u3002\u5728\u4e0a\u56fe\u4f8b\u5b50\u4e2d，SIGHUP\u4fe1\u53f7\u672a\u963b\u585e\u4e5f\u672a\u4ea7\u751f\u8fc7，\u5f53\u5b83\u9012\u8fbe\u65f6\u6267\u884c\u9ed8\u8ba4\u5904\u7406\u52a8\u4f5c<\/p>\n

\u25cfSIGINT\u4fe1\u53f7\u4ea7\u751f\u8fc7，\u4f46\u6b63\u5728\u88ab\u963b\u585e，\u6240\u4ee5\u6682\u65f6\u4e0d\u80fd\u9012\u8fbe\u3002\u867d\u7136\u5b83\u7684\u5904\u7406\u52a8\u4f5c\u662f\u5ffd\u7565，\u4f46\u5728\u6ca1\u6709\u89e3\u9664\u963b\u585e\u4e4b\u524d\u4e0d\u80fd\u5ffd\u7565\u8fd9\u4e2a\u4fe1\u53f7，\u56e0\u4e3a\u8fdb\u7a0b\u4ecd\u6709\u673a\u4f1a\u6539\u53d8\u5904\u7406\u52a8\u4f5c\u4e4b\u540e\u518d\u89e3\u9664\u963b\u585e<\/p>\n

\u25cfSIGQUIT\u4fe1\u53f7\u4ece\u672a\u4ea7\u751f\u8fc7，\u4e00\u65e6\u4ea7\u751fSIGQUIT\u4fe1\u53f7\u5c06\u88ab\u963b\u585e，\u5b83\u7684\u5904\u7406\u52a8\u4f5c\u662f\u7528\u6237\u81ea\u5b9a\u4e49\u51fd\u6570sighandler<\/p>\n

\u82e5\u5728\u8fdb\u7a0b\u89e3\u9664\u5bf9\u67d0\u4e9b\u4fe1\u53f7\u7684\u963b\u585e\u4e4b\u524d\u8fd9\u79cd\u4fe1\u53f7\u4ea7\u751f\u8fc7\u591a\u6b21，\u5c06\u5982\u4f55\u5904\u7406？POSIX.1\u5141\u8bb8\u7cfb\u7edf\u9012\u9001\u8be5\u4fe1\u53f7\u4e00\u6b21\u6216\u591a\u6b21\u3002Linux\u662f\u8fd9\u6837\u5b9e\u73b0\u7684：\u5e38\u89c4\u4fe1\u53f7\u5728\u9012\u8fbe\u4e4b\u524d\u4ea7\u751f\u591a\u6b21\u53ea\u8bb0\u4e00\u6b21，\u800c\u5b9e\u65f6\u4fe1\u53f7\u5728\u9012\u8fbe\u4e4b\u524d\u4ea7\u751f\u591a\u6b21\u53ef\u4ee5\u4f9d\u6b21\u653e\u5728\u4e00\u4e2a\u961f\u5217\u91cc<\/p>\n

\/\/ \u5185\u6838\u7ed3\u6784 2.6.18
\nstruct task_struct {
\n …
\n \/* signal handlers *\/
\n struct sighand_struct *sighand;
\n sigset_t blocked
\n struct sigpending pending;
\n …
\n};<\/p>\n

struct sighand_struct {
\n atomic_t count;
\n struct k_sigaction action[_NSIG]; \/\/ #define _NSIG 64
\n spinlock_t siglock;
\n};<\/p>\n

struct __new_sigaction {
\n __sighandler_t sa_handler;
\n unsigned long sa_flags;
\n void (*sa_restorer)(void); \/* Not used by Linux\/SPARC *\/
\n __new_sigset_t sa_mask;
\n};<\/p>\n

struct k_sigaction {
\n struct __new_sigaction sa;
\n void __user *ka_restorer;
\n};<\/p>\n

\/* Type of a signal handler. *\/
\ntypedef void (*__sighandler_t)(int);<\/p>\n

struct sigpending {
\n struct list_head list;
\n sigset_t signal;
\n};<\/p>\n

3.3 sigset_t<\/h3>\n

\u4ece\u4e0a\u56fe\u6765\u770b，\u6bcf\u4e2a\u4fe1\u53f7\u53ea\u6709\u4e00\u4e2abit\u672a\u51b3\u4fe1\u53f7，\u975e0\u53731，\u4e0d\u8bb0\u5f55\u8be5\u4fe1\u53f7\u4ea7\u751f\u4e86\u591a\u5c11\u6b21，\u963b\u585e\u6807\u5fd7\u4e5f\u662f\u8fd9\u6837\u8868\u793a\u7684\u3002\u56e0\u6b64，\u672a\u51b3\u548c\u963b\u585e\u6807\u5fd7\u53ef\u4ee5\u7528\u76f8\u540c\u7684\u6570\u636e\u7c7b\u578bsigset_t\u6765\u5b58\u50a8，sigset_t\u79f0\u4e3a\u4fe1\u53f7<\/span>\u96c6，\u8fd9\u4e2a\u7c7b\u578b\u53ef\u4ee5\u8868\u793a\u6bcf\u4e2a\u4fe1\u53f7\u7684\u201c\u6709\u6548\u201d\u6216\u201c\u65e0\u6548\u201d\u72b6\u6001，\u5728\u963b\u585e\u4fe1\u53f7\u96c6\u4e2d\u201c\u6709\u6548\u201d\u548c\u201c\u65e0\u6548\u201d\u7684\u542b\u4e49\u662f\u8be5\u4fe1\u53f7\u662f\u5426\u88ab\u963b\u585e，\u800c\u5728\u672a\u51b3\u4fe1\u53f7\u96c6\u4e2d\u201c\u6709\u6548\u201d\u548c\u201c\u65e0\u6548\u201d\u7684\u542b\u4e49\u662f\u8be5\u4fe1\u53f7\u662f\u5426\u5904\u4e8e\u672a\u51b3\u72b6\u6001\u3002\u963b\u585e\u4fe1\u53f7\u96c6\u4e5f\u53eb\u505a\u5f53\u524d\u8fdb\u7a0b\u7684\u4fe1\u53f7\u5c4f\u853d\u5b57（Signal Mask）<\/span>，\u8fd9\u91cc\u7684\u201c\u5c4f\u853d\u201d\u5e94\u7406\u89e3\u4e3a\u963b\u585e\u800c\u4e0d\u662f\u5ffd\u7565（\u7c7b\u4f3c\u4e8e\u6743\u9650\u90a3\u91cc\u7684umask）<\/p>\n

3.4\u4fe1\u53f7\u96c6\u64cd\u4f5c\u51fd\u6570<\/h3>\n

sigset_t\u7c7b\u578b\u5bf9\u4e8e\u6bcf\u79cd\u4fe1\u53f7\u7528\u4e00\u4e2abit\u8868\u793a\u201c\u6709\u6548\u201d\u6216\u201c\u65e0\u6548\u201d\u72b6\u6001，\u81f3\u4e8e\u8fd9\u4e2a\u7c7b\u578b\u5185\u90e8\u662f\u5982\u4f55\u5b58\u50a8\u8fd9\u4e9bbit\u5219\u4f9d\u8d56\u4e8e\u7cfb\u7edf\u5b9e\u73b0，\u4ece\u4f7f\u7528\u8005\u7684\u89d2\u5ea6\u4e0d\u5fc5\u5173\u5fc3，\u4f7f\u7528\u8005\u53ea\u80fd\u8c03\u7528\u4ee5\u4e0b\u51fd\u6570\u6765\u64cd\u4f5csigset_t\u53d8\u91cf，\u800c\u4e0d\u5e94\u8be5\u5bf9\u5b83\u7684\u5185\u90e8\u6570\u636e\u505a\u4efb\u4f55\u89e3\u91ca，\u6bd4\u5982\u7528printf\u76f4\u63a5\u6253\u5370sigset_t\u53d8\u91cf\u65e0\u610f\u4e49<\/p>\n

#include <signal.h>
\nint sigemptyset(sigset_t *set);
\nint sigfillset(sigset_t *set);
\nint sigaddset(sigset_t *set, int signo);
\nint sigdelset(sigset_t *set, int signo);
\nint sigismember(const sigset_t *set, int signo);<\/p>\n

\u25cf\u51fd\u6570sigemptyset\u521d\u59cb\u5316set\u6240\u6307\u5411\u7684\u4fe1\u53f7\u96c6，\u4f7f\u5176\u4e2d\u6240\u6709\u4fe1\u53f7\u7684\u5bf9\u4e8ebit\u6e05\u96f6，\u8868\u793a\u8be5\u4fe1\u53f7\u96c6\u4e0d\u5305\u62ec\u4efb\u4f55\u6709\u6548\u4fe1\u53f7<\/p>\n

\u25cf\u51fd\u6570sigfillset\u521d\u59cb\u5316set\u6240\u6307\u5411\u7684\u4fe1\u53f7\u96c6，\u4f7f\u5176\u4e2d\u6240\u6709\u4fe1\u53f7\u7684\u5bf9\u5e94bit\u7f6e1，\u8868\u793a\u8be5\u4fe1\u53f7\u96c6\u7684\u6709\u6548\u4fe1\u606f\u5305\u62ec\u7cfb\u7edf\u652f\u6301\u7684\u6240\u6709\u4fe1\u53f7<\/p>\n

\u25cf\u6ce8：\u5728\u4f7f\u7528sigset_t\u7c7b\u578b\u7684\u53d8\u91cf\u4e4b\u524d，\u4e00\u5b9a\u8981\u8c03\u7528sigemptyset\u6216sigfillset\u505a\u521d\u59cb\u5316，\u4f7f\u4fe1\u53f7\u96c6\u5904\u4e8e\u786e\u5b9a\u7684\u72b6\u6001\u3002\u521d\u59cb\u5316sigset_t\u53d8\u91cf\u4e4b\u540e\u5c31\u53ef\u4ee5\u518d\u8c03\u7528sigaddset\u548csigdelset\u5728\u8be5\u4fe1\u53f7\u96c6\u4e2d\u6dfb\u52a0\u6216\u5220\u9664\u67d0\u79cd\u6709\u6548\u4fe1\u53f7<\/p>\n

\u8fd9\u56db\u4e2a\u51fd\u6570\u90fd\u662f\u6210\u529f\u8fd4\u56de0，\u51fa\u9519\u8fd4\u56de-1\u3002sigismember\u662f\u4e00\u4e2abool\u51fd\u6570，\u7528\u4e8e\u5224\u65ad\u4e00\u4e2a\u4fe1\u53f7\u96c6\u7684\u6709\u6548\u4fe1\u53f7\u4e2d\u662f\u5426\u5305\u542b\u67d0\u79cd\u4fe1\u53f7，\u82e5\u5305\u542b\u5219\u8fd4\u56de1，\u4e0d\u5305\u542b\u5219\u8fd4\u56de0，\u51fa\u9519\u8fd4\u56de-1<\/p>\n

3.4.1 sigprocmask<\/h4>\n

\u8c03\u7528sigprocmask\u53ef\u4ee5\u8bfb\u53d6\u6216\u66f4\u6539\u8fdb\u7a0b\u7684\u4fe1\u53f7\u5c4f\u853d\u5b57（\u963b\u585e\u4fe1\u53f7\u96c6）<\/p>\n

#include <signal.h>
\nint sigprocmask(int how, const sigset_t *set, sigset_t *oset);
\n\u8fd4\u56de\u503c:\u82e5\u6210\u529f\u5219\u4e3a0,\u82e5\u51fa\u9519\u5219\u4e3a-1<\/p>\n

\u82e5oset\u662f\u975e\u7a7a\u6307\u9488，\u5219\u8bfb\u53d6\u8fdb\u7a0b\u7684\u5f53\u524d\u4fe1\u53f7\u5c4f\u853d\u5b57\u901a\u8fc7oset\u53c2\u6570\u4f20\u51fa\u3002\u82e5set\u662f\u975e\u7a7a\u6307\u9488，\u5219\u66f4\u6539\u8fdb\u7a0b\u7684\u4fe1\u53f7\u5c4f\u853d\u5b57，\u53c2\u6570how\u6307\u793a\u5982\u4f55\u66f4\u6539\u3002\u82e5oset\u548cset\u90fd\u662f\u975e\u7a7a\u6307\u9488，\u5219\u5148\u5c06\u539f\u6765\u7684\u4fe1\u53f7\u5c4f\u853d\u5b57\u5907\u4efd\u5230oset\u91cc，\u7136\u540e\u6839\u636eset\u548chow\u53c2\u6570\u66f4\u6539\u4fe1\u53f7\u5c4f\u853d\u5b57\u3002\u5047\u8bbe\u5f53\u524d\u4fe1\u53f7\u5c4f\u853d\u5b57\u4f4dmask，\u4e0b\u6807\u8bf4\u660ehow\u53c2\u6570\u7684\u53ef\u9009\u503c<\/p>\n

\"\"<\/p>\n

\u82e5\u8c03\u7528sigprocmask\u89e3\u9664\u4e86\u5bf9\u5f53\u524d\u82e5\u5e72\u4e2a\u672a\u51b3\u4fe1\u53f7\u7684\u963b\u585e，\u5219\u5728sigprocmask\u8fd4\u56de\u524d，\u81f3\u5c11\u5c06\u5176\u4e2d\u4e00\u4e2a\u4fe1\u53f7\u9012\u8fbe<\/p>\n

3.4.2 sigpending<\/h4>\n

#include <signal.h>
\nint sigpending(sigset_t *set);
\n\u8bfb\u53d6\u5f53\u524d\u8fdb\u7a0b\u7684\u672a\u51b3\u4fe1\u53f7\u96c6,\u901a\u8fc7set\u53c2\u6570\u4f20\u51fa\u3002
\n\u8c03\u2f64\u6210\u529f\u5219\u8fd4\u56de0,\u51fa\u9519\u5219\u8fd4\u56de-1<\/p>\n

#include <iostream>
\n#include <unistd.h>
\n#include <cstdio>
\n#include <sys\/types.h>
\n#include <sys\/wait.h><\/p>\n

void PrintPending(sigset_t &pending)
\n{
\n std::cout << "curr process[" << getpid() << "]pending: ";
\n for (int signo = 31; signo >= 1; signo–)
\n {
\n if (sigismember(&pending, signo))
\n {
\n std::cout << 1;
\n }
\n else
\n {
\n std::cout << 0;
\n }
\n }
\n std::cout << "\\\\n";
\n}<\/p>\n

void handler(int signo)
\n{
\n std::cout << signo << " \u53f7\u4fe1\u53f7\u88ab\u9012\u8fbe!!!" << std::endl;
\n std::cout << "——————————-" << std::endl;
\n sigset_t pending;
\n sigpending(&pending);
\n PrintPending(pending);
\n std::cout << "——————————-" << std::endl;
\n}<\/p>\n

int main()
\n{
\n \/\/ 0. \u6355\u63492\u53f7\u4fe1\u53f7
\n signal(2, handler); \/\/ \u2f83\u5b9a\u4e49\u6355\u6349
\n \/\/signal(2, SIG_IGN); \/\/ \u5ffd\u7565\u2f00\u4e2a\u4fe1\u53f7
\n \/\/signal(2, SIG_DFL); \/\/ \u4fe1\u53f7\u7684\u9ed8\u8ba4\u5904\u7406\u52a8\u4f5c
\n \/\/ 1. \u5c4f\u853d2\u53f7\u4fe1\u53f7
\n sigset_t block_set, old_set;
\n sigemptyset(&block_set);
\n sigemptyset(&old_set);
\n sigaddset(&block_set, SIGINT); \/\/ \u6211\u4eec\u6709\u6ca1\u6709\u4fee\u6539\u5f53\u524d\u8fdb\u2f8f\u7684\u5185\u6838block\u8868\u5462？\u6ca1\u6709
\n \/\/ 1.1 \u8bbe\u7f6e\u8fdb\u2f0a\u8fdb\u7a0b\u7684Block\u8868\u4e2d
\n sigprocmask(SIG_BLOCK, &block_set, &old_set); \/\/ \u771f\u6b63\u7684\u4fee\u6539\u5f53\u524d\u8fdb\u2f8f\u7684\u5185\u6838block\u8868，\u5b8c\u6210\u4e86\u5bf92\u53f7\u4fe1\u53f7\u7684\u5c4f\u853d！
\n int cnt = 15;
\n while (true)
\n {
\n \/\/ 2. \u83b7\u53d6\u5f53\u524d\u8fdb\u7a0b\u7684pending\u4fe1\u53f7\u96c6
\n sigset_t pending;
\n sigpending(&pending);
\n \/\/ 3. \u6253\u5370pending\u4fe1\u53f7\u96c6
\n PrintPending(pending);
\n cnt–;
\n \/\/ 4. \u89e3\u9664\u5bf92\u53f7\u4fe1\u53f7\u7684\u5c4f\u853d
\n if (cnt == 0)
\n {
\n std::cout << "\u89e3\u9664\u5bf92\u53f7\u4fe1\u53f7\u7684\u5c4f\u853d!!!" << std::endl;
\n sigprocmask(SIG_SETMASK, &old_set, &block_set);
\n }
\n sleep(1);
\n }
\n}<\/p>\n

$ .\/run
\ncurr process[448336]pending: 0000000000000000000000000000000
\ncurr process[448336]pending: 0000000000000000000000000000000
\n^Ccurr process[448336]pending: 0000000000000000000000000000010
\ncurr process[448336]pending: 0000000000000000000000000000010
\ncurr process[448336]pending: 0000000000000000000000000000010
\ncurr process[448336]pending: 0000000000000000000000000000010
\ncurr process[448336]pending: 0000000000000000000000000000010
\ncurr process[448336]pending: 0000000000000000000000000000010
\ncurr process[448336]pending: 0000000000000000000000000000010 <\/p>\n

\u7a0b\u5e8f\u8fd0\u884c\u65f6，\u6bcf\u79d2\u949f\u628a\u5404\u4fe1\u53f7\u7684\u672a\u51b3\u72b6\u6001\u6253\u5370\u4e00\u904d\u7531\u4e8e\u6211\u4eec\u963b\u585e\u4e86SIGINT\u4fe1\u53f7，\u6309Ctrl+c\u4f1a\u65f6SIGINT\u4fe1\u53f7\u5904\u4e8e\u672a\u51b3\u72b6\u6001，\u6309Ctrl+\\\\\u4ecd\u53ef\u4ee5\u7ec8\u6b62\u7a0b\u5e8f，\u56e0\u4e3aSIGQUIT\u4fe1\u53f7\u6ca1\u6709\u963b\u585e<\/p>\n

4.\u6355\u6349\u4fe1\u53f7<\/h2>\n

\"\"<\/p>\n

4.1\u4fe1\u53f7\u6355\u6349\u7684\u6d41\u7a0b<\/h3>\n

\"\"<\/p>\n

\u82e5\u4fe1\u53f7\u7684\u5904\u7406\u52a8\u4f5c\u662f\u7528\u6237\u81ea\u5b9a\u4e49\u51fd\u6570，\u5728\u4fe1\u53f7\u9012\u8fbe\u65f6\u5c31\u8c03\u7528\u8fd9\u4e2a\u51fd\u6570，\u8fd9\u79f0\u4e3a\u6355\u6349\u4fe1\u53f7<\/p>\n

\u7531\u4e8e\u4fe1\u53f7\u5904\u7406\u51fd\u6570\u7684\u4ee3\u7801\u662f\u5728\u7528\u6237\u7a7a\u95f4\u7684，\u5904\u7406\u8fc7\u7a0b\u6bd4\u8f83\u590d\u6742<\/p>\n

\u25cf\u7528\u6237\u7a0b\u5e8f\u6ce8\u518c\u4e86SIGQUIT\u4fe1\u53f7\u7684\u5904\u7406\u51fd\u6570sighandler<\/p>\n

\u25cf\u5f53\u524d\u6b63\u5728\u6267\u884cmain\u51fd\u6570，\u8fd9\u65f6\u53d1\u751f\u4e2d\u65ad\u6216\u5f02\u5e38\u5207\u6362\u5230\u5185\u6838\u6001<\/p>\n

\u25cf\u5728\u4e2d\u65ad\u5904\u7406\u5b8c\u6bd5\u540e\u8981\u8fd4\u56de\u7528\u6237\u6001\u7684main\u51fd\u6570\u4e4b\u524d\u68c0\u67e5\u5230\u6709\u4fe1\u53f7SIGQUIT\u9012\u8fbe<\/p>\n

\u25cf\u5185\u6838\u51b3\u5b9a\u7528\u6237\u6001\u540e\u4e0d\u662f\u6062\u590dmain\u51fd\u6570\u7684\u4e0a\u4e0b\u6587\u7ee7\u7eed\u6267\u884c，\u800c\u662f\u6267\u884csighanlder\u51fd\u6570，sighandler\u548cmain\u51fd\u6570\u4f7f\u7528\u4e0d\u540c\u7684\u5806\u6808\u7a7a\u95f4，\u5b83\u4eec\u4e4b\u95f4\u4e0d\u5b58\u5728\u8c03\u7528\u548c\u88ab\u8c03\u7528\u7684\u5173\u7cfb，\u662f\u4e24\u4e2a\u72ec\u7acb\u7684\u63a7\u5236\u6d41\u7a0b<\/p>\n

\u25cfsighandler\u51fd\u6570\u8fd4\u56de\u540e\u81ea\u52a8\u6267\u884c\u7279\u6b8a\u7684\u7cfb\u7edf\u8c03\u7528sigreturn\u518d\u6b21\u8fdb\u5165\u5185\u6838\u6001<\/p>\n

\u25cf\u82e5\u6ca1\u6709\u65b0\u7684\u4fe1\u53f7\u8981\u9012\u8fbe，\u8fd9\u6b21\u518d\u8fd4\u56de\u7528\u6237\u6001\u5c31\u662f\u6062\u590dmain\u51fd\u6570\u7684\u4e0a\u4e0b\u6587\u7ee7\u7eed\u6267\u884c<\/p>\n

\"\"<\/p>\n

4.2 sigaction<\/h3>\n

#include <signal.h>
\nint sigaction(int signo, const struct sigaction *act, struct sigaction
\n*oact);<\/p>\n

\u25cfsigaction\u51fd\u6570\u53ef\u4ee5\u8bfb\u53d6\u548c\u4fee\u6539\u4e0e\u6307\u5b9a\u4fe1\u53f7\u76f8\u5173\u8054\u7684\u5904\u7406\u52a8\u4f5c\u3002\u8c03\u7528\u6210\u529f\u5219\u8fd4\u56de0，\u51fa\u9519\u5219\u8fd4\u56de-1\u3002signo\u662f\u6307\u5b9a\u4fe1\u53f7\u7684\u7f16\u53f7\u3002\u82e5act\u6307\u9488\u4e3a\u7a7a，\u5219\u6839\u636eact\u4fee\u6539\u8be5\u4fe1\u53f7\u7684\u5904\u7406\u52a8\u4f5c\u3002\u82e5oact\u6307\u9488\u975e\u7a7a，\u5219\u901a\u8fc7oact\u4f20\u51fa\u8be5\u4fe1\u53f7\u539f\u6765\u7684\u5904\u7406\u52a8\u4f5c\u3002act\u548coact\u6307\u5411sigaction\u7ed3\u6784\u4f53<\/p>\n

\u25cf\u5c06sa_handler\u8d4b\u503c\u4e3a\u5e38\u6570SIG_IGN\u4f20\u7ed9sigaction\u8868\u793a\u5ffd\u7565\u4fe1\u53f7，\u8d4b\u503c\u4e3a\u5e38\u6570SIG_DFL\u8868\u793a\u6267\u884c\u7cfb\u7edf\u9ed8\u8ba4\u52a8\u4f5c，\u8d4b\u503c\u4e3a\u4e00\u4e2a\u51fd\u6570\u6307\u9488\u8868\u793a\u7528\u81ea\u5b9a\u4e49\u51fd\u6570\u6355\u6349\u4fe1\u53f7，\u6216\u8005\u8bf4\u5411\u5185\u6838\u6ce8\u518c\u4e86\u4e00\u4e2a\u4fe1\u53f7\u5904\u7406\u51fd\u6570，\u8be5\u51fd\u6570\u8fd4\u56de\u503c\u4e3avoid，\u53ef\u4ee5\u5e26\u4e00\u4e2aint\u51fd\u6570，\u901a\u8fc7\u53c2\u6570\u53ef\u4ee5\u5f97\u77e5\u5f53\u524d\u4fe1\u53f7\u7684\u7f16\u53f7，\u8fd9\u6837\u5c31\u53ef\u4ee5\u7528\u540c\u4e00\u4e2a\u51fd\u6570\u5904\u7406\u591a\u79cd\u4fe1\u53f7\u3002\u663e\u7136，\u8fd9\u4e5f\u662f\u4e00\u4e2a\u56de\u8c03\u51fd\u6570，\u4e0d\u662f\u88abmain\u51fd\u6570\u8c03\u7528，\u800c\u662f\u88ab\u7cfb\u7edf\u8c03\u7528<\/p>\n

\u5f53\u67d0\u4e2a\u4fe1\u53f7\u7684\u5904\u7406\u51fd\u6570\u88ab\u8c03\u7528\u65f6，\u5185\u6838\u81ea\u52a8\u5c06\u5f53\u524d\u4fe1\u53f7\u52a0\u5165\u8fdb\u7a0b\u7684\u4fe1\u53f7\u5c4f\u853d\u5b57，\u5f53\u4fe1\u53f7\u5904\u7406\u51fd\u6570\u8fd4\u56de\u65f6\u81ea\u52a8\u6062\u590d\u539f\u6765\u7684\u4fe1\u53f7\u5c4f\u853d\u5b57，\u8fd9\u6837\u5c31\u4fdd\u8bc1\u4e86\u5728\u5904\u7406\u67d0\u4e2a\u4fe1\u53f7\u65f6，\u82e5\u8fd9\u79cd\u4fe1\u53f7\u518d\u6b21\u4ea7\u751f，\u90a3\u4e48\u5b83\u4f1a\u88ab\u963b\u585e\u5230\u5f53\u524d\u5904\u7406\u7ed3\u675f\u4e3a\u6b62\u3002\u82e5\u5728\u8c03\u7528\u4fe1\u53f7\u5904\u7406\u51fd\u6570\u65f6，\u5904\u7406\u5f53\u524d\u4fe1\u53f7\u88ab\u81ea\u52a8\u5c4f\u853d\u4e4b\u5916，\u8fd8\u5e0c\u671b\u81ea\u52a8\u5c4f\u853d\u53e6\u5916\u4e00\u4e9b\u4fe1\u53f7，\u5219\u7528sa_mask\u5b57\u6bb5\u8bf4\u660e\u8fd9\u4e9b\u9700\u8981\u989d\u5916\u5c4f\u853d\u7684\u4fe1\u53f7，\u5f53\u4fe1\u53f7\u5904\u7406\u51fd\u6570\u8fd4\u56de\u65f6\u81ea\u52a8\u6062\u590d\u539f\u6765\u7684\u4fe1\u53f7\u5c4f\u853d\u5b57\u3002sa_flags\u5b57\u6bb5\u5305\u542b\u4e00\u4e9b\u9009\u9879，\u8fd9\u91cc\u90fd\u628a\u5b83\u8bbe\u4e3a0，sa_sigaction\u662f\u5b9e\u65f6\u4fe1\u53f7\u7684\u5904\u7406\u51fd\u6570<\/p>\n

4.3\u64cd\u4f5c\u7cfb\u7edf\u662f\u5982\u4f55\u8fd0\u884c\u7684<\/h3>\n

4.3.1\u786c\u4ef6\u4e2d\u65ad<\/h4>\n

\"\"<\/p>\n

\u25cf\u4e2d\u65ad\u5411\u91cf\u8868\u5c31\u662f\u64cd\u4f5c\u7cfb\u7edf\u7684\u4e00\u90e8\u5206，\u542f\u52a8\u5c31\u52a0\u8f7d\u5230\u5185\u5b58\u4e2d\u4e86<\/p>\n

\u25cf\u901a\u8fc7\u5916\u90e8\u786c\u4ef6\u4e2d\u65ad，\u64cd\u4f5c\u7cfb\u7edf\u5c31\u4e0d\u9700\u8981\u5bf9\u5916\u8bbe\u8fdb\u884c\u4efb\u4f55\u5468\u671f\u6027\u7684\u68c0\u6d4b\u6216\u8f6e\u8be2<\/p>\n

\u25cf\u7531\u5916\u90e8\u8bbe\u5907\u89e6\u53d1\u7684，\u4e2d\u65ad\u7cfb\u7edf\u8fd0\u884c\u6d41\u7a0b，\u53eb\u505a\u786c\u4ef6\u4e2d\u65ad<\/p>\n

\"\"<\/p>\n

\/\/Linux\u5185\u68380.11\u6e90\u7801
\nvoid trap_init(void)
\n{
\n int i;
\n set_trap_gate(0,&divide_error);\/\/ \u8bbe\u7f6e\u9664\u64cd\u4f5c\u51fa\u9519\u7684\u4e2d\u65ad\u5411\u91cf\u503c\u3002\u4ee5\u4e0b\u96f7\u540c\u3002
\n set_trap_gate(1,&debug);
\n set_trap_gate(2,&nmi);
\n set_system_gate(3,&int3); \/* int3-5 can be called from all *\/
\n set_system_gate(4,&overflow);
\n set_system_gate(5,&bounds);
\n set_trap_gate(6,&invalid_op);
\n set_trap_gate(7,&device_not_available);
\n set_trap_gate(8,&double_fault);
\n set_trap_gate(9,&coprocessor_segment_overrun);
\n set_trap_gate(10,&invalid_TSS);
\n set_trap_gate(11,&segment_not_present);
\n set_trap_gate(12,&stack_segment);
\n set_trap_gate(13,&general_protection);
\n set_trap_gate(14,&page_fault);
\n set_trap_gate(15,&reserved);
\n set_trap_gate(16,&coprocessor_error);
\n\/\/ \u4e0b\u2faf\u5c06int17-48 \u7684\u9677\u9631\u2ed4\u5148\u5747\u8bbe\u7f6e\u4e3areserved，\u4ee5\u540e\u6bcf\u4e2a\u786c\u4ef6\u521d\u59cb\u5316\u65f6\u4f1a\u91cd\u65b0\u8bbe\u7f6e\u2f83\u2f30\u7684\u9677\u9631
\n\u2ed4\u3002
\n for (i=17;i<48;i++)
\n set_trap_gate(i,&reserved);
\n set_trap_gate(45,&irq13);\/\/ \u8bbe\u7f6e\u534f\u5904\u7406\u5668\u7684\u9677\u9631\u2ed4\u3002
\n outb_p(inb_p(0x21)&0xfb,0x21);\/\/ \u5141\u8bb8\u4e3b8259A \u82af\u2f5a\u7684IRQ2 \u4e2d\u65ad\u8bf7\u6c42\u3002
\n outb(inb_p(0xA1)&0xdf,0xA1);\/\/ \u5141\u8bb8\u4ece8259A \u82af\u2f5a\u7684IRQ13 \u4e2d\u65ad\u8bf7\u6c42\u3002
\n set_trap_gate(39,&parallel_interrupt);\/\/ \u8bbe\u7f6e\u5e76\u2f8f\u2f1d\u7684\u9677\u9631\u2ed4\u3002
\n}<\/p>\n

void
\nrs_init (void)
\n{
\n set_intr_gate (0x24, rs1_interrupt); \/\/ \u8bbe\u7f6e\u4e32\u2f8f\u2f1d1 \u7684\u4e2d\u65ad\u2ed4\u5411\u91cf(\u786c\u4ef6IRQ4\u4fe1\u53f7)\u3002
\n set_intr_gate (0x23, rs2_interrupt); \/\/ \u8bbe\u7f6e\u4e32\u2f8f\u2f1d2 \u7684\u4e2d\u65ad\u2ed4\u5411\u91cf(\u786c\u4ef6IRQ3\u4fe1\u53f7)\u3002
\n init (tty_table[1].read_q.data); \/\/ \u521d\u59cb\u5316\u4e32\u2f8f\u2f1d1(.data \u662f\u7aef\u2f1d\u53f7)\u3002
\n init (tty_table[2].read_q.data); \/\/ \u521d\u59cb\u5316\u4e32\u2f8f\u2f1d2\u3002
\n outb (inb_p (0x21) & 0xE7, 0x21); \/\/ \u5141\u8bb8\u4e3b8259A \u82af\u2f5a\u7684IRQ3，IRQ4 \u4e2d\u65ad\u4fe1\u53f7\u8bf7\u6c42\u3002
\n}<\/p>\n

4.3.2\u65f6\u949f\u4e2d\u65ad<\/h4>\n

\u95ee\u9898：<\/p>\n

\u25cf\u8fdb\u7a0b\u53ef\u4ee5\u5728\u64cd\u4f5c\u7cfb\u7edf\u7684\u6307\u6325\u4e0b，\u88ab\u8c03\u5ea6，\u88ab\u6267\u884c，\u90a3\u4e48\u64cd\u4f5c\u7cfb\u7edf\u81ea\u5df1\u88ab\u8c01\u6307\u6325，\u88ab\u8c01\u63a8\u52a8\u6267\u884c？<\/p>\n

\u25cf\u5916\u90e8\u8bbe\u5907\u53ef\u4ee5\u89e6\u53d1\u786c\u4ef6\u4e2d\u65ad，\u4f46\u662f\u8fd9\u4e2a\u662f\u9700\u8981\u7528\u6237\u6216\u8bbe\u5907\u81ea\u5df1\u89e6\u53d1，\u6709\u65e0\u81ea\u5df1\u53ef\u4ee5\u5b9a\u671f\u89e6\u53d1\u7684\u8bbe\u5907<\/p>\n

\"\"<\/p>\n

\u6b64\u65f6，\u64cd\u4f5c\u7cfb\u7edf\u5c31\u53ef\u4ee5\u5728\u786c\u4ef6\u7684\u63a8\u52a8\u4e0b，\u81ea\u52a8\u8c03\u5ea6<\/p>\n

\/\/ Linux \u5185\u68380.11
\n\/\/ main.c
\nsched_init(); \/\/ \u8c03\u5ea6\u7a0b\u5e8f\u521d\u59cb\u5316(\u52a0\u8f7d\u4e86\u4efb\u52a10 \u7684tr, ldtr) （kernel\/sched.c）<\/p>\n

\/\/ \u8c03\u5ea6\u7a0b\u5e8f\u7684\u521d\u59cb\u5316\u2f26\u7a0b\u5e8f\u3002
\nvoid sched_init(void)
\n{
\n …
\n set_intr_gate(0x20, &timer_interrupt);
\n \/\/ \u4fee\u6539\u4e2d\u65ad\u63a7\u5236\u5668\u5c4f\u853d\u7801，\u5141\u8bb8\u65f6\u949f\u4e2d\u65ad\u3002
\n outb(inb_p(0x21) & ~0x01, 0x21);
\n \/\/ \u8bbe\u7f6e\u7cfb\u7edf\u8c03\u2f64\u4e2d\u65ad\u2ed4\u3002
\n set_system_gate(0x80, &system_call);
\n …
\n}<\/p>\n

\/\/ system_call.s
\n_timer_interrupt:
\n …
\n;\/\/ do_timer(CPL)\u6267\u2f8f\u4efb\u52a1\u5207\u6362\u3001\u8ba1\u65f6\u7b49\u2f2f\u4f5c，\u5728kernel\/shched.c,305 \u2f8f\u5b9e\u73b0\u3002
\n call _do_timer ;\/\/ 'do_timer(long CPL)' does everything from<\/p>\n

\/\/ \u8c03\u5ea6\u2f0a\u2f1d
\nvoid do_timer(long cpl)
\n{
\n …
\n schedule();
\n}<\/p>\n

void schedule(void)
\n{
\n …
\n switch_to(next); \/\/ \u5207\u6362\u5230\u4efb\u52a1\u53f7\u4e3anext \u7684\u4efb\u52a1，\u5e76\u8fd0\u2f8f\u4e4b\u3002
\n}<\/p>\n

4.3.3\u6b7b\u5faa\u73af<\/h4>\n

\u82e5\u662f\u8fd9\u6837，\u90a3\u64cd\u4f5c\u7cfb\u7edf\u4e0d\u5c31\u4ec0\u4e48\u4e5f\u4e0d\u7528\u505a\u4e86\u5417？\u662f\u7684，\u64cd\u4f5c\u7cfb\u7edf\u5c31\u662f\u4ec0\u4e48\u4e5f\u4e0d\u7528\u505a，\u9700\u8981\u4ec0\u4e48\u529f\u80fd，\u5c31\u50cf\u4e2d\u65ad\u5411\u91cf\u8868\u4e2d\u6dfb\u52a0\u65b9\u6cd5\u5373\u53ef\u3002\u64cd\u4f5c\u7cfb\u7edf\u7684\u672c\u8d28：\u5c31\u662f\u4e00\u4e2a\u6b7b\u5faa\u73af<\/p>\n

void main(void) \/* \u8fd9\u2fa5\u786e\u5b9e\u662fvoid，\u5e76\u6ca1\u9519\u3002 *\/
\n{ \/* \u5728startup \u7a0b\u5e8f(head.s)\u4e2d\u5c31\u662f\u8fd9\u6837\u5047\u8bbe\u7684\u3002 *\/
\n …
\n\/*
\n* \u6ce8\u610f!! \u5bf9\u4e8e\u4efb\u4f55\u5176\u5b83\u7684\u4efb\u52a1，'pause()'\u5c06\u610f\u5473\u7740\u6211\u4eec\u5fc5\u987b\u7b49\u5f85\u6536\u5230\u2f00\u4e2a\u4fe1\u53f7\u624d\u4f1a\u8fd4
\n* \u56de\u5c31\u7eea\u8fd0\u2f8f\u6001，\u4f46\u4efb\u52a10（task0）\u662f\u552f\u2f00\u7684\u610f\u5916\u60c5\u51b5（\u53c2\u2ec5'schedule()'），\u56e0\u4e3a\u4efb
\n* \u52a10 \u5728\u4efb\u4f55\u7a7a\u95f2\u65f6\u95f4\u2fa5\u90fd\u4f1a\u88ab\u6fc0\u6d3b（\u5f53\u6ca1\u6709\u5176\u5b83\u4efb\u52a1\u5728\u8fd0\u2f8f\u65f6），
\n* \u56e0\u6b64\u5bf9\u4e8e\u4efb\u52a10'pause()'\u4ec5\u610f\u5473\u7740\u6211\u4eec\u8fd4\u56de\u6765\u67e5\u770b\u662f\u5426\u6709\u5176\u5b83\u4efb\u52a1\u53ef\u4ee5\u8fd0\u2f8f，\u5982\u679c\u6ca1
\n* \u6709\u7684\u8bdd\u6211\u4eec\u5c31\u56de\u5230\u8fd9\u2fa5，\u2f00\u76f4\u5faa\u73af\u6267\u2f8f'pause()'\u3002
\n*\/
\n for (;;)
\n pause();
\n} \/\/ end main <\/p>\n

\u25cf\u8fd9\u6837，\u64cd\u4f5c\u7cfb\u7edf，\u5c31\u53ef\u4ee5\u5728\u786c\u4ef6\u65f6\u949f\u7684\u63a8\u52a8\u4e0b，\u81ea\u52a8\u8c03\u5ea6\u4e86<\/p>\n

\u25cf\u6240\u4ee5，\u4ec0\u4e48\u662f\u65f6\u95f4\u7247？CPU\u4e3a\u4ec0\u4e48\u6709\u4e3b\u9891？\u4e3a\u4ec0\u4e48\u4e3b\u9891\u8d8a\u5feb，CPU\u8d8a\u5feb？\u4e3b\u9891\u53ef\u4ee5\u4f5c\u4e3aOS\u8c03\u5ea6\u6267\u884c\u901f\u5ea6\u7684\u53c2\u8003\u4e4b\u4e00<\/p>\n

\"\"<\/p>\n

4.3.4\u8f6f\u4e2d\u65ad<\/h4>\n

\u25cf\u4e0a\u8ff0\u786c\u4ef6\u4e2d\u65ad，\u9700\u8981\u786c\u4ef6\u8bbe\u5907\u89e6\u53d1<\/p>\n

\u25cf\u6709\u65e0\u53ef\u80fd，\u56e0\u4e3a\u8f6f\u4ef6\u539f\u56e0，\u4e5f\u80fd\u89e6\u53d1\u4e0a\u9762\u7684\u903b\u8f91？\u6709！<\/p>\n

\u25cf\u4e3a\u8ba9\u64cd\u4f5c\u7cfb\u7edf\u652f\u6301\u8fdb\u884c\u7cfb\u7edf\u8c03\u7528，CPU\u4e5f\u8bbe\u8ba1\u4e86\u5bf9\u5e94\u7684\u6c47\u7f16\u6307\u4ee4（int\u6216syscall），\u53ef\u4ee5\u8ba9CPU\u5185\u90e8\u89e6\u53d1\u4e2d\u65ad\u903b\u8f91<\/p>\n

\u6240\u4ee5： \"\"<\/p>\n

\u95ee\u9898：<\/p>\n

\u25cf\u7528\u6237\u5c42\u5982\u4f55\u628a\u7cfb\u7edf\u8c03\u7528\u53f7\u7ed9\u64cd\u4f5c\u7cfb\u7edf？ \u5bc4\u5b58\u5668（\u5982EAX）<\/p>\n

\u25cf\u64cd\u4f5c\u7cfb\u7edf\u5982\u4f55\u628a\u8fd4\u56de\u503c\u7ed9\u7528\u6237？ \u5bc4\u5b58\u5668\u6216\u7528\u6237\u4f20\u5165\u7684\u7f13\u51b2\u533a\u5730\u5740<\/p>\n

\u25cf\u7cfb\u7edf\u8c03\u7528\u7684\u8fc7\u7a0b，\u5176\u5b9e\u5c31\u662f\u5148int 0x80\u3001syscall\u9677\u5165\u5185\u6838，\u672c\u8d28\u5c31\u662f\u89e6\u53d1\u8f6f\u4e2d\u65ad，CPU\u5c31\u4f1a\u81ea\u52a8\u6267\u884c\u7cfb\u7edf\u8c03\u7528\u7684\u5904\u7406\u65b9\u6cd5，\u800c\u8fd9\u4e2a\u65b9\u6cd5\u4f1a\u6839\u636e\u7cfb\u7edf\u8c03\u7528\u53f7，\u81ea\u52a8\u67e5\u8868\u6267\u884c\u5bf9\u5e94\u7684\u65b9\u6cd5<\/p>\n

\u25cf\u7cfb\u7edf\u8c03\u7528\u53f7\u672c\u8d28：\u6570\u7ec4\u4e0b\u6807<\/p>\n

\/\/ sys.h
\n\/\/ \u7cfb\u7edf\u8c03\u2f64\u51fd\u6570\u6307\u9488\u8868\u3002\u2f64\u4e8e\u7cfb\u7edf\u8c03\u2f64\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f(int 0x80)，\u4f5c\u4e3a\u8df3\u8f6c\u8868\u3002
\nextern int sys_setup (); \/\/ \u7cfb\u7edf\u542f\u52a8\u521d\u59cb\u5316\u8bbe\u7f6e\u51fd\u6570\u3002 (kernel\/blk_drv\/hd.c,71)
\nextern int sys_exit (); \/\/ \u7a0b\u5e8f\u9000\u51fa\u3002 (kernel\/exit.c, 137)
\nextern int sys_fork (); \/\/ \u521b\u5efa\u8fdb\u7a0b\u3002 (kernel\/system_call.s, 208)
\nextern int sys_read (); \/\/ \u8bfb\u2f42\u4ef6\u3002 (fs\/read_write.c, 55)
\nextern int sys_write (); \/\/ \u5199\u2f42\u4ef6\u3002 (fs\/read_write.c, 83)
\nextern int sys_open (); \/\/ \u6253\u5f00\u2f42\u4ef6\u3002 (fs\/open.c, 138)
\nextern int sys_close (); \/\/ \u5173\u95ed\u2f42\u4ef6\u3002 (fs\/open.c, 192)
\nextern int sys_waitpid (); \/\/ \u7b49\u5f85\u8fdb\u7a0b\u7ec8\u2f4c\u3002 (kernel\/exit.c, 142)
\nextern int sys_creat (); \/\/ \u521b\u5efa\u2f42\u4ef6\u3002 (fs\/open.c, 187)
\nextern int sys_link (); \/\/ \u521b\u5efa\u2f00\u4e2a\u2f42\u4ef6\u7684\u786c\u8fde\u63a5\u3002 (fs\/namei.c, 721)
\nextern int sys_unlink (); \/\/ \u5220\u9664\u2f00\u4e2a\u2f42\u4ef6\u540d(\u6216\u5220\u9664\u2f42\u4ef6)\u3002 (fs\/namei.c, 663)
\nextern int sys_execve (); \/\/ \u6267\u2f8f\u7a0b\u5e8f\u3002 (kernel\/system_call.s, 200)
\nextern int sys_chdir (); \/\/ \u66f4\u6539\u5f53\u524d\u2f6c\u5f55\u3002 (fs\/open.c, 75)
\nextern int sys_time (); \/\/ \u53d6\u5f53\u524d\u65f6\u95f4\u3002 (kernel\/sys.c, 102)
\nextern int sys_mknod (); \/\/ \u5efa\u2f74\u5757\/\u5b57\u7b26\u7279\u6b8a\u2f42\u4ef6\u3002 (fs\/namei.c, 412)
\nextern int sys_chmod (); \/\/ \u4fee\u6539\u2f42\u4ef6\u5c5e\u6027\u3002 (fs\/open.c, 105)
\nextern int sys_chown (); \/\/ \u4fee\u6539\u2f42\u4ef6\u5bbf\u4e3b\u548c\u6240\u5c5e\u7ec4\u3002 (fs\/open.c, 121)
\nextern int sys_break (); \/\/ (-kernel\/sys.c, 21)
\nextern int sys_stat (); \/\/ \u4f7f\u2f64\u8def\u5f84\u540d\u53d6\u2f42\u4ef6\u7684\u72b6\u6001\u4fe1\u606f\u3002 (fs\/stat.c, 36)
\nextern int sys_lseek (); \/\/ \u91cd\u65b0\u5b9a\u4f4d\u8bfb\/\u5199\u2f42\u4ef6\u504f\u79fb\u3002 (fs\/read_write.c, 25)
\nextern int sys_getpid (); \/\/ \u53d6\u8fdb\u7a0bid\u3002 (kernel\/sched.c, 348)
\nextern int sys_mount (); \/\/ \u5b89\u88c5\u2f42\u4ef6\u7cfb\u7edf\u3002 (fs\/super.c, 200)
\nextern int sys_umount (); \/\/ \u5378\u8f7d\u2f42\u4ef6\u7cfb\u7edf\u3002 (fs\/super.c, 167)
\nextern int sys_setuid (); \/\/ \u8bbe\u7f6e\u8fdb\u7a0b\u2f64\u2f3eid\u3002 (kernel\/sys.c, 143)
\nextern int sys_getuid (); \/\/ \u53d6\u8fdb\u7a0b\u2f64\u2f3eid\u3002 (kernel\/sched.c, 358)
\nextern int sys_stime (); \/\/ \u8bbe\u7f6e\u7cfb\u7edf\u65f6\u95f4\u2f47\u671f\u3002 (-kernel\/sys.c, 148)
\nextern int sys_ptrace (); \/\/ \u7a0b\u5e8f\u8c03\u8bd5\u3002 (-kernel\/sys.c, 26)
\nextern int sys_alarm (); \/\/ \u8bbe\u7f6e\u62a5\u8b66\u3002 (kernel\/sched.c, 338)
\nextern int sys_fstat (); \/\/ \u4f7f\u2f64\u2f42\u4ef6\u53e5\u67c4\u53d6\u2f42\u4ef6\u7684\u72b6\u6001\u4fe1\u606f\u3002(fs\/stat.c, 47)
\nextern int sys_pause (); \/\/ \u6682\u505c\u8fdb\u7a0b\u8fd0\u2f8f\u3002 (kernel\/sched.c, 144)
\nextern int sys_utime (); \/\/ \u6539\u53d8\u2f42\u4ef6\u7684\u8bbf\u95ee\u548c\u4fee\u6539\u65f6\u95f4\u3002 (fs\/open.c, 24)
\nextern int sys_stty (); \/\/ \u4fee\u6539\u7ec8\u7aef\u2f8f\u8bbe\u7f6e\u3002 (-kernel\/sys.c, 31)
\nextern int sys_gtty (); \/\/ \u53d6\u7ec8\u7aef\u2f8f\u8bbe\u7f6e\u4fe1\u606f\u3002 (-kernel\/sys.c, 36)
\nextern int sys_access (); \/\/ \u68c0\u67e5\u2f64\u2f3e\u5bf9\u2f00\u4e2a\u2f42\u4ef6\u7684\u8bbf\u95ee\u6743\u9650\u3002(fs\/open.c, 47)
\nextern int sys_nice (); \/\/ \u8bbe\u7f6e\u8fdb\u7a0b\u6267\u2f8f\u4f18\u5148\u6743\u3002 (kernel\/sched.c, 378)
\nextern int sys_ftime (); \/\/ \u53d6\u2f47\u671f\u548c\u65f6\u95f4\u3002 (-kernel\/sys.c,16)
\nextern int sys_sync (); \/\/ \u540c\u6b65\u2fbc\u901f\u7f13\u51b2\u4e0e\u8bbe\u5907\u4e2d\u6570\u636e\u3002 (fs\/buffer.c, 44)
\nextern int sys_kill (); \/\/ \u7ec8\u2f4c\u2f00\u4e2a\u8fdb\u7a0b\u3002 (kernel\/exit.c, 60)
\nextern int sys_rename (); \/\/ \u66f4\u6539\u2f42\u4ef6\u540d\u3002 (-kernel\/sys.c, 41)
\nextern int sys_mkdir (); \/\/ \u521b\u5efa\u2f6c\u5f55\u3002 (fs\/namei.c, 463)
\nextern int sys_rmdir (); \/\/ \u5220\u9664\u2f6c\u5f55\u3002 (fs\/namei.c, 587)
\nextern int sys_dup (); \/\/ \u590d\u5236\u2f42\u4ef6\u53e5\u67c4\u3002 (fs\/fcntl.c, 42)
\nextern int sys_pipe (); \/\/ \u521b\u5efa\u7ba1\u9053\u3002 (fs\/pipe.c, 71)
\nextern int sys_times (); \/\/ \u53d6\u8fd0\u2f8f\u65f6\u95f4\u3002 (kernel\/sys.c, 156)
\nextern int sys_prof (); \/\/ \u7a0b\u5e8f\u6267\u2f8f\u65f6\u95f4\u533a\u57df\u3002 (-kernel\/sys.c, 46)
\nextern int sys_brk (); \/\/ \u4fee\u6539\u6570\u636e\u6bb5\u2ed3\u5ea6\u3002 (kernel\/sys.c, 168)
\nextern int sys_setgid (); \/\/ \u8bbe\u7f6e\u8fdb\u7a0b\u7ec4id\u3002 (kernel\/sys.c, 72)
\nextern int sys_getgid (); \/\/ \u53d6\u8fdb\u7a0b\u7ec4id\u3002 (kernel\/sched.c, 368)
\nextern int sys_signal (); \/\/ \u4fe1\u53f7\u5904\u7406\u3002 (kernel\/signal.c, 48)
\nextern int sys_geteuid (); \/\/ \u53d6\u8fdb\u7a0b\u6709\u6548\u2f64\u2f3eid\u3002 (kenrl\/sched.c, 363)
\nextern int sys_getegid (); \/\/ \u53d6\u8fdb\u7a0b\u6709\u6548\u7ec4id\u3002 (kenrl\/sched.c, 373)
\nextern int sys_acct (); \/\/ \u8fdb\u7a0b\u8bb0\u5e10\u3002 (-kernel\/sys.c, 77)
\nextern int sys_phys (); \/\/ (-kernel\/sys.c, 82)
\nextern int sys_lock (); \/\/ (-kernel\/sys.c, 87)
\nextern int sys_ioctl (); \/\/ \u8bbe\u5907\u63a7\u5236\u3002 (fs\/ioctl.c, 30)
\nextern int sys_fcntl (); \/\/ \u2f42\u4ef6\u53e5\u67c4\u64cd\u4f5c\u3002 (fs\/fcntl.c, 47)
\nextern int sys_mpx (); \/\/ (-kernel\/sys.c, 92)
\nextern int sys_setpgid (); \/\/ \u8bbe\u7f6e\u8fdb\u7a0b\u7ec4id\u3002 (kernel\/sys.c, 181)
\nextern int sys_ulimit (); \/\/ (-kernel\/sys.c, 97)
\nextern int sys_uname (); \/\/ \u663e\u2f70\u7cfb\u7edf\u4fe1\u606f\u3002 (kernel\/sys.c, 216)
\nextern int sys_umask (); \/\/ \u53d6\u9ed8\u8ba4\u2f42\u4ef6\u521b\u5efa\u5c5e\u6027\u7801\u3002 (kernel\/sys.c, 230)
\nextern int sys_chroot (); \/\/ \u6539\u53d8\u6839\u7cfb\u7edf\u3002 (fs\/open.c, 90)
\nextern int sys_ustat (); \/\/ \u53d6\u2f42\u4ef6\u7cfb\u7edf\u4fe1\u606f\u3002 (fs\/open.c, 19)
\nextern int sys_dup2 (); \/\/ \u590d\u5236\u2f42\u4ef6\u53e5\u67c4\u3002 (fs\/fcntl.c, 36)
\nextern int sys_getppid (); \/\/ \u53d6\u2f57\u8fdb\u7a0bid\u3002 (kernel\/sched.c, 353)
\nextern int sys_getpgrp (); \/\/ \u53d6\u8fdb\u7a0b\u7ec4id，\u7b49\u4e8egetpgid(0)\u3002(kernel\/sys.c, 201)
\nextern int sys_setsid (); \/\/ \u5728\u65b0\u4f1a\u8bdd\u4e2d\u8fd0\u2f8f\u7a0b\u5e8f\u3002 (kernel\/sys.c, 206)
\nextern int sys_sigaction (); \/\/ \u6539\u53d8\u4fe1\u53f7\u5904\u7406\u8fc7\u7a0b\u3002 (kernel\/signal.c, 63)
\nextern int sys_sgetmask (); \/\/ \u53d6\u4fe1\u53f7\u5c4f\u853d\u7801\u3002 (kernel\/signal.c, 15)
\nextern int sys_ssetmask (); \/\/ \u8bbe\u7f6e\u4fe1\u53f7\u5c4f\u853d\u7801\u3002 (kernel\/signal.c, 20)
\nextern int sys_setreuid (); \/\/ \u8bbe\u7f6e\u771f\u5b9e\u4e0e\/\u6216\u6709\u6548\u2f64\u2f3eid\u3002 (kernel\/sys.c,118)
\nextern int sys_setregid (); \/\/ \u8bbe\u7f6e\u771f\u5b9e\u4e0e\/\u6216\u6709\u6548\u7ec4id\u3002 (kernel\/sys.c, 51)<\/p>\n

\/\/ \u7cfb\u7edf\u8c03\u2f64\u51fd\u6570\u6307\u9488\u8868\u3002\u2f64\u4e8e\u7cfb\u7edf\u8c03\u2f64\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f(int 0x80)，\u4f5c\u4e3a\u8df3\u8f6c\u8868\u3002
\nfn_ptr sys_call_table[] = { sys_setup, sys_exit, sys_fork, sys_read,
\nsys_write, sys_open, sys_close, sys_waitpid, sys_creat, sys_link,
\nsys_unlink, sys_execve, sys_chdir, sys_time, sys_mknod, sys_chmod,
\nsys_chown, sys_break, sys_stat, sys_lseek, sys_getpid, sys_mount,
\nsys_umount, sys_setuid, sys_getuid, sys_stime, sys_ptrace, sys_alarm,
\nsys_fstat, sys_pause, sys_utime, sys_stty, sys_gtty, sys_access,
\nsys_nice, sys_ftime, sys_sync, sys_kill, sys_rename, sys_mkdir,
\nsys_rmdir, sys_dup, sys_pipe, sys_times, sys_prof, sys_brk, sys_setgid,
\nsys_getgid, sys_signal, sys_geteuid, sys_getegid, sys_acct, sys_phys,
\nsys_lock, sys_ioctl, sys_fcntl, sys_mpx, sys_setpgid, sys_ulimit,
\nsys_uname, sys_umask, sys_chroot, sys_ustat, sys_dup2, sys_getppid,
\nsys_getpgrp, sys_setsid, sys_sigaction, sys_sgetmask, sys_ssetmask,
\nsys_setreuid, sys_setregid
\n};<\/p>\n

\/\/ \u8c03\u5ea6\u7a0b\u5e8f\u7684\u521d\u59cb\u5316\u2f26\u7a0b\u5e8f\u3002
\nvoid sched_init(void)
\n{
\n …
\n \/\/ \u8bbe\u7f6e\u7cfb\u7edf\u8c03\u2f64\u4e2d\u65ad\u2ed4\u3002
\n set_system_gate(0x80, &system_call);
\n}<\/p>\n

_system_call:
\n cmp eax,nr_system_calls-1 ;\/\/ \u8c03\u2f64\u53f7\u5982\u679c\u8d85\u51fa\u8303\u56f4\u7684\u8bdd\u5c31\u5728eax \u4e2d\u7f6e-1 \u5e76\u9000\u51fa\u3002
\n ja bad_sys_call
\n push ds ;\/\/ \u4fdd\u5b58\u539f\u6bb5\u5bc4\u5b58\u5668\u503c\u3002
\n push es
\n push fs
\n push edx ;\/\/ ebx,ecx,edx \u4e2d\u653e\u7740\u7cfb\u7edf\u8c03\u2f64\u76f8\u5e94\u7684C \u8bed\u2f94\u51fd\u6570\u7684\u8c03\u2f64\u53c2\u6570\u3002
\n push ecx ;\/\/ push %ebx,%ecx,%edx as parameters
\n push ebx ;\/\/ to the system call
\n mov edx,10h ;\/\/ set up ds,es to kernel space
\n mov ds,dx ;\/\/ ds,es \u6307\u5411\u5185\u6838\u6570\u636e\u6bb5(\u5168\u5c40\u63cf\u8ff0\u7b26\u8868\u4e2d\u6570\u636e\u6bb5\u63cf\u8ff0\u7b26)\u3002
\n mov es,dx
\n mov edx,17h ;\/\/ fs points to local data space
\n mov fs,dx ;\/\/ fs \u6307\u5411\u5c40\u90e8\u6570\u636e\u6bb5(\u5c40\u90e8\u63cf\u8ff0\u7b26\u8868\u4e2d\u6570\u636e\u6bb5\u63cf\u8ff0\u7b26)\u3002
\n;\/\/ \u4e0b\u2faf\u8fd9\u53e5\u64cd\u4f5c\u6570\u7684\u542b\u4e49\u662f：\u8c03\u2f64\u5730\u5740 = _sys_call_table + %eax * 4\u3002\u53c2\u2ec5\u5217\u8868\u540e\u7684\u8bf4
\n\u660e\u3002
\n;\/\/ \u5bf9\u5e94\u7684C \u7a0b\u5e8f\u4e2d\u7684sys_call_table \u5728include\/linux\/sys.h \u4e2d，\u5176\u4e2d\u5b9a\u4e49\u4e86\u2f00\u4e2a\u5305\u62ec72
\n\u4e2a
\n;\/\/ \u7cfb\u7edf\u8c03\u2f64C \u5904\u7406\u51fd\u6570\u7684\u5730\u5740\u6570\u7ec4\u8868\u3002
\n call [_sys_call_table+eax*4]
\n push eax ;\/\/ \u628a\u7cfb\u7edf\u8c03\u2f64\u53f7\u2f0a\u6808\u3002
\n mov eax,_current ;\/\/ \u53d6\u5f53\u524d\u4efb\u52a1（\u8fdb\u7a0b）\u6570\u636e\u7ed3\u6784\u5730\u5740??eax\u3002
\n;\/\/ \u4e0b\u2faf97-100 \u2f8f\u67e5\u770b\u5f53\u524d\u4efb\u52a1\u7684\u8fd0\u2f8f\u72b6\u6001\u3002\u5982\u679c\u4e0d\u5728\u5c31\u7eea\u72b6\u6001(state \u4e0d\u7b49\u4e8e0)\u5c31\u53bb\u6267\u2f8f\u8c03\u5ea6\u7a0b
\n\u5e8f\u3002
\n;\/\/ \u5982\u679c\u8be5\u4efb\u52a1\u5728\u5c31\u7eea\u72b6\u6001\u4f46counter[??]\u503c\u7b49\u4e8e0，\u5219\u4e5f\u53bb\u6267\u2f8f\u8c03\u5ea6\u7a0b\u5e8f\u3002
\n cmp dword ptr [state+eax],0 ;\/\/ state
\n jne reschedule
\n cmp dword ptr [counter+eax],0 ;\/\/ counter
\n je reschedule
\n;\/\/ \u4ee5\u4e0b\u8fd9\u6bb5\u4ee3\u7801\u6267\u2f8f\u4ece\u7cfb\u7edf\u8c03\u2f64C \u51fd\u6570\u8fd4\u56de\u540e，\u5bf9\u4fe1\u53f7\u91cf\u8fdb\u2f8f\u8bc6\u522b\u5904\u7406\u3002
\nret_from_sys_call:<\/p>\n

\u25cf\u90a3\u4e3a\u4ec0\u4e48\u6211\u4eec\u7528\u7684\u7cfb\u7edf\u8c03\u7528，\u4ece\u6765\u6ca1\u6709\u89c1\u8fc7int 0x80\u6216syscall\u5462？\u90fd\u662f\u76f4\u63a5\u8c03\u7528\u4e0a\u5c42\u7684\u51fd\u6570？<\/p>\n

\u25cf\u90a3\u662f\u56e0\u4e3aLinux\u7684gnu\u00a0C\u6807\u51c6\u5e93，\u7ed9\u6211\u4eec\u628a\u51e0\u4e4e\u6240\u6709\u7684\u7cfb\u7edf\u8c03\u7528\u5168\u90e8\u5c01\u88c5\u4e86<\/p>\n

\"\"<\/p>\n

\u25cf#define SYS_ify(syscall_name) __NR_##syscall_name：\u662f\u4e00\u4e2a\u5b8f\u5b9a\u4e49，\u7528\u4e8e\u5c06\u7cfb\u7edf\u8c03\u7528\u7684\u540d\u79f0\u8f6c\u6362\u4e3a\u5bf9\u5e94\u7684\u7cfb\u7edf\u8c03\u7528\u53f7\u3002\u5982：SYS_ify(open)\u4f1a\u88ab\u5c55\u5f00\u4e3a__NR_open<\/p>\n

\u25cf\u800c\u7cfb\u7edf\u8c03\u7528\u53f7，\u4e0d\u662fglibc\u63d0\u4f9b\u7684，\u662f\u5185\u6838\u63d0\u4f9b\u7684，\u5185\u6838\u63d0\u4f9b\u7cfb\u7edf\u8c03\u7528\u5165\u53e3\u5c55\u5f00\u51fd\u6570man 2 syscall，\u6216\u8005\u76f4\u63a5\u63d0\u4f9b\u6c47\u7f16\u7ea7\u522b\u8f6f\u4e2d\u65ad\u547d\u4ee4int or syscall，\u5e76\u63d0\u4f9b\u5bf9\u5e94\u7684\u5934\u6587\u4ef6\u6216\u5f00\u53d1\u5165\u53e3，\u8ba9\u4e0a\u5c42\u8bed\u8a00\u7684\u8bbe\u8ba1\u8005\u4f7f\u7528\u7cfb\u7edf\u8c03\u7528\u53f7，\u5b8c\u6210\u7cfb\u7edf\u8c03\u7528\u8fc7\u7a0b<\/p>\n

\u6e90\u4ee3\u7801\u8def\u5f84：linux-2.6.18\\\\linux-2.6.18\\\\include\\\\asm-x86_64\\\\unistd.h
\n\/* at least 8 syscall per cacheline *\/
\n#define __NR_read 0
\n__SYSCALL(__NR_read, sys_read)
\n#define __NR_write 1
\n__SYSCALL(__NR_write, sys_write)
\n#define __NR_open 2
\n__SYSCALL(__NR_open, sys_open)
\n#define __NR_close 3
\n__SYSCALL(__NR_close, sys_close)
\n#define __NR_stat 4
\n__SYSCALL(__NR_stat, sys_newstat)
\n#define __NR_fstat 5
\n__SYSCALL(__NR_fstat, sys_newfstat)
\n#define __NR_lstat 6
\n__SYSCALL(__NR_lstat, sys_newlstat)
\n#define __NR_poll 7
\n__SYSCALL(__NR_poll, sys_poll)<\/p>\n

#define __NR_lseek 8
\n__SYSCALL(__NR_lseek, sys_lseek)
\n#define __NR_mmap 9
\n__SYSCALL(__NR_mmap, sys_mmap)
\n#define __NR_mprotect 10
\n__SYSCALL(__NR_mprotect, sys_mprotect)
\n#define __NR_munmap 11
\n__SYSCALL(__NR_munmap, sys_munmap)
\n#define __NR_brk 12
\n__SYSCALL(__NR_brk, sys_brk)
\n#define __NR_rt_sigaction 13
\n__SYSCALL(__NR_rt_sigaction, sys_rt_sigaction)
\n#define __NR_rt_sigprocmask 14
\n__SYSCALL(__NR_rt_sigprocmask, sys_rt_sigprocmask)
\n#define __NR_rt_sigreturn 15
\n__SYSCALL(__NR_rt_sigreturn, stub_rt_sigreturn)<\/p>\n

…<\/p>\n

\u6216\u90e8\u5206\u7248\u672c\u5728glibc\u4e2d，\u5e93\u51fd\u6570\u8c03\u7528\u5b9e\u73b0\u65b9\u5f0f：<\/p>\n

# define INTERNAL_SYSCALL_NCS(name, err, nr, args…) \\\\
\n({ \\\\
\n unsigned long int resultvar; \\\\
\n LOAD_ARGS_##nr (args) \\\\
\n LOAD_REGS_##nr \\\\
\n asm volatile ( \\\\
\n "syscall\\\\n\\\\t" \\\\
\n : "=a" (resultvar) \\\\
\n : "0" (name) ASM_ARGS_##nr : "memory", "cc", "r11", "cx"); \\\\
\n (long int) resultvar; })<\/p>\n

4.3.5\u7f3a\u9875\u4e2d\u65ad，\u5185\u5b58\u788e\u7247\u5904\u7406，\u9664\u96f6\u91ce\u6307\u9488\u9519\u8bef<\/h4>\n

void trap_init(void)
\n{
\n int i;
\n set_trap_gate(0,&divide_error);\/\/ \u8bbe\u7f6e\u9664\u64cd\u4f5c\u51fa\u9519\u7684\u4e2d\u65ad\u5411\u91cf\u503c\u3002\u4ee5\u4e0b\u96f7\u540c\u3002
\n set_trap_gate(1,&debug);
\n set_trap_gate(2,&nmi);
\n set_system_gate(3,&int3); \/* int3-5 can be called from all *\/
\n set_system_gate(4,&overflow);
\n set_system_gate(5,&bounds);
\n set_trap_gate(6,&invalid_op);
\n set_trap_gate(7,&device_not_available);
\n set_trap_gate(8,&double_fault);
\n set_trap_gate(9,&coprocessor_segment_overrun);
\n set_trap_gate(10,&invalid_TSS);
\n set_trap_gate(11,&segment_not_present);
\n set_trap_gate(12,&stack_segment);
\n set_trap_gate(13,&general_protection);
\n set_trap_gate(14,&page_fault);
\n set_trap_gate(15,&reserved);
\n set_trap_gate(16,&coprocessor_error);
\n \/\/ \u4e0b\u2faf\u5c06int17-48 \u7684\u9677\u9631\u2ed4\u5148\u5747\u8bbe\u7f6e\u4e3areserved，\u4ee5\u540e\u6bcf\u4e2a\u786c\u4ef6\u521d\u59cb\u5316\u65f6\u4f1a\u91cd\u65b0\u8bbe\u7f6e\u2f83\u2f30\u7684\u9677\u9631
\n \u2ed4\u3002
\n for (i=17;i<48;i++)
\n set_trap_gate(i,&reserved);
\n set_trap_gate(45,&irq13);\/\/ \u8bbe\u7f6e\u534f\u5904\u7406\u5668\u7684\u9677\u9631\u2ed4\u3002
\n outb_p(inb_p(0x21)&0xfb,0x21);\/\/ \u5141\u8bb8\u4e3b8259A \u82af\u2f5a\u7684IRQ2 \u4e2d\u65ad\u8bf7\u6c42\u3002
\n outb(inb_p(0xA1)&0xdf,0xA1);\/\/ \u5141\u8bb8\u4ece8259A \u82af\u2f5a\u7684IRQ13 \u4e2d\u65ad\u8bf7\u6c42\u3002
\n set_trap_gate(39,&parallel_interrupt);\/\/ \u8bbe\u7f6e\u5e76\u2f8f\u2f1d\u7684\u9677\u9631\u2ed4\u3002
\n}<\/p>\n

\u25cf\u7f3a\u9875\u4e2d\u65ad，\u5185\u5b58\u788e\u7247\u5904\u7406，\u9664\u96f6\u91ce\u6307\u9488\u9519\u8bef，\u8fd9\u4e9b\u95ee\u9898，\u5168\u90e8\u90fd\u4f1a\u88ab\u8f6c\u5316\u79f0CPU\u5185\u90e8\u7684\u8f6f\u4e2d\u65ad，\u7136\u540e\u8d70\u4e2d\u65ad\u5904\u7406\u4f8b\u7a0b，\u5b8c\u6210\u6240\u6709\u5904\u7406\u3002\u6709\u7684\u662f\u8fdb\u884c\u7533\u8bf7\u5185\u5b58，\u586b\u5145\u9875\u8868，\u8fdb\u884c\u6620\u5c04\u7684\u3002\u6709\u7684\u662f\u7528\u6765\u5904\u7406\u5185\u5b58\u788e\u7247\u7684，\u6709\u7684\u662f\u7528\u6765\u7ed9\u76ee\u6807\u8fdb\u884c\u53d1\u9001\u4fe1\u53f7，\u6740\u6389\u8fdb\u7a0b\u7b49<\/p>\n

\u6240\u4ee5：<\/p>\n

\u25cf\u64cd\u4f5c\u7cfb\u7edf\u5c31\u662f\u8d9f\u5728\u4e2d\u65ad\u5904\u7406\u4f8b\u7a0b\u4e0a\u7684\u4ee3\u7801\u5757<\/p>\n

\u25cfCPU\u5185\u90e8\u7684\u8f6f\u4e2d\u65ad，\u6bd4\u5982int 0x80\u6216\u8005syscall，\u6211\u4eec\u53eb\u505a\u9677\u9631<\/p>\n

\u25cfCPU\u5185\u90e8\u7684\u8f6f\u4e2d\u65ad，\u6bd4\u5982\u9664\u96f6\/\u91ce\u6307\u9488\u7b49，\u6211\u4eec\u53eb\u505a\u5f02\u5e38<\/p>\n

4.4\u5982\u4f55\u7406\u89e3\u7528\u6237\u6001\u548c\u5185\u6838\u6001<\/h3>\n

\"\"<\/p>\n

\"\"<\/p>\n

\u7ed3\u8bba：<\/p>\n

\u25cf\u64cd\u4f5c\u7cfb\u7edf\u65e0\u8bba\u600e\u4e48\u5207\u6362\u8fdb\u7a0b，\u90fd\u80fd\u627e\u5230\u540c\u4e00\u4e2a\u64cd\u4f5c\u7cfb\u7edf\u3002\u5373\u64cd\u4f5c\u7cfb\u7edf\u8c03\u7528\u53d1\u6cd5\u7684\u6267\u884c，\u662f\u5728\u8fdb\u7a0b\u7684\u5730\u5740\u7a7a\u95f4\u4e2d\u6267\u884c\u7684<\/p>\n

\u25cf\u7528\u6237\u6001\u5c31\u662f\u6267\u884c\u7528\u6237[0,3]GB\u65f6\u6240\u5904\u7684\u72b6\u6001<\/p>\n

\u25cf\u5185\u6838\u6001\u5c31\u662f\u6267\u884c\u5185\u6838[3,4]GB\u65f6\u6240\u5904\u7684\u72b6\u6001<\/p>\n

\u25cf\u533a\u5206\u5c31\u662f\u6309\u7167CPU\u5185\u7684CPL\u51b3\u5b9a，CPL（Current Privilege Level），\u5373\u5f53\u524d\u7279\u6743\u7ea7\u522b<\/p>\n

\u25cf\u4e00\u822c\u6267\u884cint 0x80\u6216syscall\u8f6f\u4e2d\u65ad，CPL\u4f1a\u5728\u6821\u9a8c\u4e4b\u540e\u81ea\u52a8\u53d8\u66f4<\/p>\n<\/p>\n<\/p><\/p>\n","protected":false},"excerpt":{"rendered":"

💁\u200d\u2642\ufe0f\u4e2a\u4eba\u4e3b\u9875：\u8fdb\u51fb\u7684\u8346\u68d8 👇\u4f5c\u8005\u5176\u5b83\u4e13\u680f： \u300a\u6570\u636e\u7ed3\u6784\u4e0e\u7b97\u6cd5\u300b\u300a\u7b97\u6cd5\u300b\u300aC\u8d77\u59cb\u4e4b\u8def\u300b\u300aLinux\u300b \u76ee\u5f55
\n1.\u4fe1\u53f7\u524d\u5bfc
\n2.\u4ea7\u751f\u4fe1\u53f7
\n3.\u4fdd\u5b58\u4fe1\u53f7
\n4.\u6355\u6349\u4fe1\u53f7
\n5.\u53ef\u91cd\u5165\u51fd\u6570
\n6.volatile
\n7.SIGCHLD\u4fe1\u53f7
\n8.\u9644\u5f55 3.\u4fdd\u5b58\u4fe1\u53f7 3.1\u4fe1\u53f7\u76f8\u5173\u6982\u5ff5
\n\u25cf\u5b9e\u9645\u6267\u884c\u4fe1\u53f7\u7684\u5904\u7406\u52a8\u4f5c\u79f0\u4e3a\u4fe1\u53f7\u9012\u8fbe（Delivery）
\n\u25cf\u4fe1\u53f7\u4ece\u4ea7\u751f\u5230\u9012\u8fbe\u4e4b\u95f4\u7684\u72b6\u6001&#xff0c<\/p>\n","protected":false},"author":2,"featured_media":120597,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[8606,58,2710,43,44],"topic":[],"class_list":["post-120611","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-8606","tag-linux","tag-2710","tag-43","tag-44"],"yoast_head":"\nLinux\u7cfb\u7edf\u2014\u2014\u8fdb\u7a0b\u4fe1\u53f7\u4e4b\u4fdd\u5b58\u548c\u6355\u6349\u4fe1\u53f7 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/120611.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Linux\u7cfb\u7edf\u2014\u2014\u8fdb\u7a0b\u4fe1\u53f7\u4e4b\u4fdd\u5b58\u548c\u6355\u6349\u4fe1\u53f7 - 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