{"id":72544,"date":"2026-02-05T23:05:47","date_gmt":"2026-02-05T15:05:47","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/72544.html"},"modified":"2026-02-05T23:05:47","modified_gmt":"2026-02-05T15:05:47","slug":"21%e9%87%8d%e8%b0%88%e9%87%8d%e5%ae%9a%e4%b9%89%e7%90%86%e8%a7%a3%e4%b8%80%e5%88%87%e7%9a%86%e6%96%87%e4%bb%b6%e5%8f%8a%e7%bc%93%e5%ad%98%e5%8c%ba","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/72544.html","title":{"rendered":"21:\u91cd\u8c08\u91cd\u5b9a\u4e49\u7406\u89e3\u4e00\u5207\u7686\u201c\u6587\u4ef6\u201c\u53ca\u7f13\u5b58\u533a"},"content":{"rendered":"

🔥\u4e2a\u4eba\u4e3b\u9875：Milestone-\u91cc\u7a0b\u7891<\/p>\n

\u2744\ufe0f\u4e2a\u4eba\u4e13\u680f:\u00a0<<\u529b\u6263hot100>>\u00a0<<C++>><<Linux>><\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0<<Git>><<MySQL>><\/p>\n

🌟\u5fc3\u5411\u5f80\u4e4b\u884c\u5fc5\u80fd\u81f3<\/p>\n

\n

\u00a0\u76ee\u5f55<\/p>\n

\u4e00.\u91cd\u8c08\u91cd\u5b9a\u4e49<\/p>\n

1.1<\/p>\n

\u4e3a\u4ec0\u4e48\u6709\u6807\u51c6\u8f93\u51fa\u4e0e\u6807\u51c6\u9519\u8bef<\/p>\n

\u4e8c.\u7406\u89e3\u4e00\u5207\u7686"\u6587\u4ef6"<\/p>\n

\u4e09.\u7f13\u51b2\u533a :\u89e3\u51b3\u524d\u9762sleep\u5237\u65b0\u95ee\u9898<\/p>\n

5-1 \u4ec0\u4e48\u662f\u7f13\u51b2\u533a<\/p>\n

5.2 \u4e3a\u4ec0\u4e48\u8981\u6709<\/p>\n

5.3 \u7f13\u51b2\u7c7b\u578b<\/p>\n

5.4 \u4ee3\u7801\u5b9e\u6218<\/p>\n

\u56db,\u8bbe\u8ba1\u7b80\u5355\u7684libc\u5e93<\/p>\n

\n

\u4e00.\u91cd\u8c08\u91cd\u5b9a\u4e49<\/h2>\n

\u5e73\u65f6\u6211\u4eec\u91cd\u5b9a\u4e49\u7684\u5199\u6cd5<\/p>\n

[lcb@hcss-ecs-1cde 7]$ .\/a.out > log.txt<\/p>\n

\u4f46\u5176\u5b9e\u662f\u7701\u7565\u4e861,\u7cfb\u7edf\u9ed8\u8ba4\u662f1(\u6807\u51c6\u8f93\u51fa)\u7684\u91cd\u5b9a\u5411\u5199\u5165<\/p>\n

[lcb@hcss-ecs-1cde 7]$ .\/a.out 1 > log.txt <\/p>\n

1.1<\/h3>\n

1 #include <cstdio>
\n 2 #include<iostream>
\n 3 using namespace std;
\n 4 int main()
\n 5 {
\n 6 cout<<"hello cout"<<endl;
\n 7 printf("hello printf\\\\n");
\n 8 cerr<<"hello cerr"<<endl;
\n 9 fprintf(stderr,"hello stderr\\\\n");
\n 10
\n 11 return 0;
\n 12 }<\/p>\n

[lcb@hcss-ecs-1cde 7]$ .\/a.out
\nhello cout
\nhello printf
\nhello cerr
\nhello stderr
\n[lcb@hcss-ecs-1cde 7]$ .\/a.out >log.txt
\nhello cerr
\nhello stderr<\/p>\n

[lcb@hcss-ecs-1cde 7]$ .\/a.out 1 >log.normal 2>log.error
\n[lcb@hcss-ecs-1cde 7]$ cat log.normal
\nhello cout
\nhello printf
\n[lcb@hcss-ecs-1cde 7]$ cat log.error
\nhello cerr
\nhello stderr<\/p>\n

[lcb@hcss-ecs-1cde 7]$ .\/a.out > log.normal 2>> log.normal
\n[lcb@hcss-ecs-1cde 7]$ cat log.normal
\nhello cout
\nhello printf
\nhello cerr
\nhello stderr
\n[lcb@hcss-ecs-1cde 7]$ .\/a.out 1 >log.normal 2>&1
\n[lcb@hcss-ecs-1cde 7]$ cat log.normal
\nhello cout
\nhello printf
\nhello cerr
\nhello stderr<\/p>\n

\u4e3a\u4ec0\u4e48\u6709\u6807\u51c6\u8f93\u51fa\u4e0e\u6807\u51c6\u9519\u8bef<\/h3>\n

\u5c06\u5e38\u89c4\u6d88\u606f\u4e0e\u9519\u8bef\u6d88\u606f\u8fdb\u884c\u5206\u79bb<\/p>\n

\u90fd\u6253\u5370\u5230\u4e00\u4e2a\u6587\u4ef6\u5462<\/p>\n

\u4f8b\u5b50<\/p>\n

\u5bf9\u8f93\u51fa\u8fdb\u884c\u91cd\u5b9a\u5411\u540e<\/p>\n

1 #include<stdio.h>
\n 2 #include<unistd.h>
\n 3 #include<sys\/types.h>
\n 4 #include<string.h>
\n 5 #include<sys\/stat.h>
\n 6 #include<fcntl.h>
\n 7 #include<stdio.h>
\n 8 #include <iostream>
\n 9 int main()
\n 10 {
\n 11 int fd =open("myfile.c",O_CREAT | O_WRONLY| O_TRUNC,0666);
\n 12 dup2(fd,1);
\n 13 printf("hello printf\\\\n");
\n 14 std::cout<<"hello cout"<<std::endl;
\n 15 std::cerr<<"hello cerr"<<std::endl;
\n 16 close(fd);
\n 17 return 0;
\n 18 }<\/p>\n

\u53d1\u73b0\u6807\u51c6\u9519\u8bef\u6ca1\u6709\u6539\u53d8\u8f93\u5165\u6587\u4ef6<\/p>\n

[lcb@hcss-ecs-1cde 7]$ g++ 1.c
\n[lcb@hcss-ecs-1cde 7]$ .\/a.out
\nhello cerr
\n[lcb@hcss-ecs-1cde 7]$ vim 1.c
\n[lcb@hcss-ecs-1cde 7]$ cat myfile.c
\nhello printf
\nhello cout<\/p>\n

\u4e8c.\u7406\u89e3\u4e00\u5207\u7686"\u6587\u4ef6"<\/h2>\n

\u5982\u8fdb\u7a0b\u3001\u78c1\u76d8\u3001\u663e\u2f70\u5668\u3001\u952e\u76d8\u8fd9\u6837\u786c\u4ef6\u8bbe\u5907\u4e5f\u88ab\u62bd\u8c61\u6210\u4e86\u2f42\u4ef6，\u4f60\u53ef\u4ee5\u4f7f\u2f64\u8bbf\u95ee\u2f42\u4ef6\u7684\u2f45\u6cd5\u8bbf <\/span><\/p>\n

\u95ee\u5b83\u4eec\u83b7\u5f97\u4fe1\u606f；\u751a\u2f84\u7ba1\u9053，\u4e5f\u662f\u2f42\u4ef6<\/span><\/p>\n

\u5f00\u53d1\u8005\u4ec5\u9700\u8981\u4f7f\u2f64\u2f00\u5957 API \u548c\u5f00\u53d1\u2f2f\u5177，\u5373\u53ef\u8c03\u53d6 Linux \u7cfb\u7edf\u4e2d\u7edd\u2f24\u90e8\u5206\u7684\u8d44\u6e90\u3002\u4e3e\u4e2a\u7b80\u5355\u7684\u4f8b\u2f26，Linux \u4e2d\u2f0f\u4e4e\u6240\u6709\u8bfb（\u8bfb\u2f42\u4ef6，\u8bfb\u7cfb\u7edf\u72b6\u6001，\u8bfbPIPE）\u7684\u64cd\u4f5c\u90fd\u53ef\u4ee5\u2f64 read \u51fd\u6570\u6765\u8fdb\u2f8f；\u2f0f\u4e4e\u6240\u6709\u66f4\u6539（\u66f4\u6539\u2f42\u4ef6，\u66f4\u6539\u7cfb\u7edf\u53c2\u6570，\u5199 PIPE）\u7684\u64cd\u4f5c\u90fd\u53ef\u4ee5\u2f64 write <\/span>
\n \u51fd\u6570\u6765\u8fdb\u2f8f\u3002<\/span><\/p>\n

struct file {
\n…
\n1
\n2
\n3
\n4
\nstruct inode *f_inode; \/* cached value *\/
\nconst struct file_operations *f_op;
\n…
\natomic_long_t f_count; \/\/ \u8868\u2f70\u6253\u5f00\u2f42\u4ef6\u7684\u5f15\u2f64\u8ba1\u6570，\u5982\u679c\u6709\u591a\u4e2a\u2f42\u4ef6\u6307\u9488\u6307
\n\u5411\u5b83，\u5c31\u4f1a\u589e\u52a0f_count\u7684\u503c\u3002
\nunsigned int f_flags; \/\/ \u8868\u2f70\u6253\u5f00\u2f42\u4ef6\u7684\u6743\u9650
\nfmode_t f_mode; \/\/ \u8bbe\u7f6e\u5bf9\u2f42\u4ef6\u7684\u8bbf\u95ee\u6a21\u5f0f,\u4f8b\u5982：\u53ea\u8bfb，\u53ea\u5199\u7b49\u3002\u6240
\n\u6709\u7684\u6807\u5fd7\u5728\u5934\u2f42\u4ef6<fcntl.h> \u4e2d\u5b9a\u4e49
\nloff_t f_pos; \/\/ \u8868\u2f70\u5f53\u524d\u8bfb\u5199\u2f42\u4ef6\u7684\u4f4d\u7f6e
\n…
\n} __attribute__((aligned(4))); \/* lest something weird decides that 2 is OK
\n*\/ <\/p>\n

\u4e09.\u7f13\u51b2\u533a :\u89e3\u51b3\u524d\u9762sleep\u5237\u65b0\u95ee\u9898<\/h2>\n

5-1 \u4ec0\u4e48\u662f\u7f13\u51b2\u533a <\/span><\/h3>\n

\u7f13\u51b2\u533a\u662f\u5185\u5b58\u7a7a\u95f4\u7684\u2f00\u90e8\u5206\u3002\u4e5f\u5c31\u662f\u8bf4，\u5728\u5185\u5b58\u7a7a\u95f4\u4e2d\u9884\u7559\u4e86\u2f00\u5b9a\u7684\u5b58\u50a8\u7a7a\u95f4，\u8fd9\u4e9b\u5b58\u50a8\u7a7a\u95f4\u2f64\u6765\u7f13\u51b2\u8f93\u2f0a\u6216\u8f93\u51fa\u7684\u6570\u636e，\u8fd9\u90e8\u5206\u9884\u7559\u7684\u7a7a\u95f4\u5c31\u53eb\u505a\u7f13\u51b2\u533a\u3002\u7f13\u51b2\u533a\u6839\u636e\u5176\u5bf9\u5e94\u7684\u662f\u8f93\u2f0a\u8bbe\u5907\u8fd8\u662f\u8f93\u51fa\u8bbe \u5907，\u5206\u4e3a\u8f93\u2f0a\u7f13\u51b2\u533a\u548c\u8f93\u51fa\u7f13\u51b2\u533a\u3002<\/span><\/p>\n

5.2 \u4e3a\u4ec0\u4e48\u8981\u6709<\/h3>\n

\u8bfb\u5199\u2f42\u4ef6\u65f6，\u5982\u679c\u4e0d\u4f1a\u5f00\u8f9f\u5bf9\u2f42\u4ef6\u64cd\u4f5c\u7684\u7f13\u51b2\u533a，\u76f4\u63a5\u901a\u8fc7\u7cfb\u7edf\u8c03\u2f64\u5bf9\u78c1\u76d8\u8fdb\u2f8f\u64cd\u4f5c(\u8bfb\u3001\u5199\u7b49)，\u90a3\u4e48 \u6bcf\u6b21\u5bf9\u2f42\u4ef6\u8fdb\u2f8f\u2f00\u6b21\u8bfb\u5199\u64cd\u4f5c\u65f6，\u90fd\u9700\u8981\u4f7f\u2f64\u8bfb\u5199\u7cfb\u7edf\u8c03\u2f64\u6765\u5904\u7406\u6b64\u64cd\u4f5c，\u5373\u9700\u8981\u6267\u2f8f\u2f00\u6b21\u7cfb\u7edf\u8c03 \u2f64，\u6267\u2f8f\u2f00\u6b21\u7cfb\u7edf\u8c03\u2f64\u5c06\u6d89\u53ca\u5230CPU\u72b6\u6001\u7684\u5207\u6362，\u5373\u4ece\u2f64\u2f3e\u7a7a\u95f4\u5207\u6362\u5230\u5185\u6838\u7a7a\u95f4，\u5b9e\u73b0\u8fdb\u7a0b\u4e0a\u4e0b\u2f42\u7684 \u5207\u6362，\u8fd9\u5c06\u635f\u8017\u2f00\u5b9a\u7684CPU\u65f6\u95f4，\u9891\u7e41\u7684\u78c1\u76d8\u8bbf\u95ee\u5bf9\u7a0b\u5e8f\u7684\u6267\u2f8f\u6548\u7387\u9020\u6210\u5f88\u2f24\u7684\u5f71\u54cd\u3002 <\/span><\/p>\n

\u4e3a\u4e86\u51cf\u5c11\u4f7f\u2f64\u7cfb\u7edf\u8c03\u2f64\u7684\u6b21\u6570，\u63d0\u2fbc\u6548\u7387，\u6211\u4eec\u5c31\u53ef\u4ee5\u91c7\u2f64\u7f13\u51b2\u673a\u5236\u3002\u2f50\u5982\u6211\u4eec\u4ece\u78c1\u76d8\u2fa5\u53d6\u4fe1\u606f\u53ef <\/span><\/p>\n

\u4ee5\u5728\u78c1\u76d8\u2f42\u4ef6\u8fdb\u2f8f\u64cd\u4f5c\u65f6，\u53ef\u4ee5\u2f00\u6b21\u4ece\u2f42\u4ef6\u4e2d\u8bfb\u51fa\u2f24\u91cf\u7684\u6570\u636e\u5230\u7f13\u51b2\u533a\u4e2d，\u4ee5\u540e\u5bf9\u8fd9\u90e8\u5206\u7684\u8bbf\u95ee\u5c31\u4e0d \u9700\u8981\u518d\u4f7f\u2f64\u7cfb\u7edf\u8c03\u2f64\u4e86，\u7b49\u7f13\u51b2\u533a\u7684\u6570\u636e\u53d6\u5b8c\u540e\u518d\u53bb\u78c1\u76d8\u4e2d\u8bfb\u53d6，\u8fd9\u6837\u5c31\u53ef\u4ee5\u51cf\u5c11\u78c1\u76d8\u7684\u8bfb\u5199\u6b21\u6570，\u518d\u52a0\u4e0a\u8ba1\u7b97\u673a\u5bf9\u7f13\u51b2\u533a\u7684\u64cd\u4f5c\u2f24 \u5feb\u4e8e\u5bf9\u78c1\u76d8\u7684\u64cd\u4f5c，\u6545\u5e94\u2f64\u7f13\u51b2\u533a\u53ef\u2f24 \u63d0\u2fbc\u8ba1\u7b97\u673a\u7684\u8fd0\u2f8f\u901f\u5ea6\u3002<\/span><\/p>\n

\u5982\u4f60\u4e70\u4e86\u4e00\u5927\u5806\u5feb\u9012,\u5982\u679c\u6765\u4e00\u4e2a,\u6253\u7535\u8bdd\u53eb\u4f60\u53bb\u62ff,\u4f60\u5c31\u8981\u4e2d\u6b62\u81ea\u5df1\u7684\u4e8b\u53bb\u62ff,\u4f46\u5982\u679c\u6709\u4e86\u83dc\u9e1f\u9a7f\u7ad9,\u5c31\u53ef\u4ee5\u4e00\u5b9a\u6570\u91cf\u518d\u53bb\u62ff,\u6548\u7387\u5927\u5927\u63d0\u9ad8<\/p>\n

5.3 \u7f13\u51b2\u7c7b\u578b<\/h3>\n

\u6807\u51c6I\/O\u63d0\u4f9b\u4e863\u79cd\u7c7b\u578b\u7684\u7f13\u51b2\u533a\u3002 <\/span><\/p>\n

\u2022 <\/span><\/p>\n

\u5168\u7f13\u51b2\u533a：\u8fd9\u79cd\u7f13\u51b2\u2f45\u5f0f\u8981\u6c42\u586b\u6ee1\u6574\u4e2a\u7f13\u51b2\u533a\u540e\u624d\u8fdb\u2f8fI\/O\u7cfb\u7edf\u8c03\u2f64\u64cd\u4f5c\u3002\u5bf9\u4e8e\u78c1\u76d8\u2f42\u4ef6\u7684\u64cd\u4f5c\u901a <\/span><\/p>\n

\u5e38\u4f7f\u2f64\u5168\u7f13\u51b2\u7684\u2f45\u5f0f\u8bbf\u95ee\u3002 <\/span><\/p>\n

\u2022 <\/span><\/p>\n

\u2f8f\u7f13\u51b2\u533a：\u5728\u2f8f\u7f13\u51b2\u60c5\u51b5\u4e0b，\u5f53\u5728\u8f93\u2f0a\u548c\u8f93\u51fa\u4e2d\u9047\u5230\u6362\u2f8f\u7b26\u65f6，\u6807\u51c6I\/O\u5e93\u51fd\u6570\u5c06\u4f1a\u6267\u2f8f\u7cfb\u7edf\u8c03\u2f64 <\/span><\/p>\n

\u64cd\u4f5c\u3002\u5f53\u6240\u64cd\u4f5c\u7684\u6d41\u6d89\u53ca\u2f00\u4e2a\u7ec8\u7aef\u65f6（\u4f8b\u5982\u6807\u51c6\u8f93\u2f0a\u548c\u6807\u51c6\u8f93\u51fa），\u4f7f\u2f64\u2f8f\u7f13\u51b2\u2f45\u5f0f\u3002\u56e0\u4e3a\u6807\u51c6 <\/span><\/p>\n

I\/O\u5e93\u6bcf\u2f8f\u7684\u7f13\u51b2\u533a\u2ed3\u5ea6\u662f\u56fa\u5b9a\u7684，\u6240\u4ee5\u53ea\u8981\u586b\u6ee1\u4e86\u7f13\u51b2\u533a，\u5373\u4f7f\u8fd8\u6ca1\u6709\u9047\u5230\u6362\u2f8f\u7b26，\u4e5f\u4f1a\u6267\u2f8f <\/span><\/p>\n

I\/O\u7cfb\u7edf\u8c03\u2f64\u64cd\u4f5c，\u9ed8\u8ba4\u2f8f\u7f13\u51b2\u533a\u7684\u2f24\u2f29\u4e3a1024\u3002 <\/span><\/p>\n

\u4e3a\u4e86\u7b26\u5408\u7528\u6237\u9605\u8bfb\u4e60\u60ef<\/span><\/p>\n

\u2022 <\/span><\/p>\n

\u2f46\u7f13\u51b2\u533a：\u2f46\u7f13\u51b2\u533a\u662f\u6307\u6807\u51c6I\/O\u5e93\u4e0d\u5bf9\u5b57\u7b26\u8fdb\u2f8f\u7f13\u5b58，\u76f4\u63a5\u8c03\u2f64\u7cfb\u7edf\u8c03\u2f64\u3002\u6807\u51c6\u51fa\u9519\u6d41stderr\u901a <\/span><\/p>\n

\u5e38\u662f\u4e0d\u5e26\u7f13\u51b2\u533a\u7684，\u8fd9\u4f7f\u5f97\u51fa\u9519\u4fe1\u606f\u80fd\u591f\u5c3d\u5feb\u5730\u663e\u2f70\u51fa\u6765\u3002 <\/span><\/p>\n

\u9664\u4e86\u4e0a\u8ff0\u5217\u4e3e\u7684\u9ed8\u8ba4\u5237\u65b0\u2f45\u5f0f，\u4e0b\u5217\u7279\u6b8a\u60c5\u51b5\u4e5f\u4f1a\u5f15\u53d1\u7f13\u51b2\u533a\u7684\u5237\u65b0： <\/span><\/p>\n

1. <\/span>
\n \u7f13\u51b2\u533a\u6ee1\u65f6； <\/span><\/p>\n

2. <\/span>
\n \u6267\u2f8fflush\u8bed\u53e5； <\/span><\/p>\n

3. <\/span>
\n \u8fdb\u7a0b\u7ed3\u675f<\/span><\/p>\n

\"\"<\/p>\n<\/p>\n

5.4 \u4ee3\u7801\u5b9e\u6218<\/h3>\n

#include<stdio.h>
\n 2 #include<unistd.h>
\n 3 #include<stdlib.h>
\n 4 int main()
\n 5 {
\n 6 \/\/\u5e93\u51fd\u6570
\n 7 printf("hello printf\\\\n");
\n 8 fprintf(stdout,"hello fprintf\\\\n");
\n 9 const char*s="hello fwrite\\\\n";
\nE> 10 fwrite(s,strlen(s),1,stdout);
\n 11
\n 12 \/\/\u7cfb\u7edf\u8c03\u7528
\n 13 const char*ss="hello write\\\\n";
\nE> 14 write(1,ss,strlen(ss));
\n 15 fork();
\n 16 return 0;
\n 17 }
\n ~<\/p>\n

\u7ed3\u679c\u601d\u8003<\/p>\n

[lcb@hcss-ecs-1cde 8]$ .\/a.out
\nhello printf
\nhello fprintf
\nhello fwrite
\nhello write
\n[lcb@hcss-ecs-1cde 8]$ .\/a.out > log.txt
\n[lcb@hcss-ecs-1cde 8]$ cat log.txt
\nhello write
\nhello printf
\nhello fprintf
\nhello fwrite
\nhello printf
\nhello fprintf
\nhello fwrite<\/p>\n

\u4e3a\u4ec0\u4e48\u76f4\u63a5\u5c55\u5f00\u4e0e\u91cd\u5b9a\u5411\u5c55\u5f00,\u7ed3\u679c\u4e0d\u4e00\u6837<\/p>\n

\u539f\u56e0\u662f\u91cd\u5b9a\u5411,\u5bfc\u81f4\u7a0b\u5e8f\u8fd8\u672a\u7ed3\u675f,\u90a3\u4e48\u5b50\u8fdb\u7a0b\u7ed3\u675f,\u5c31\u4f1a\u5237\u65b0\u4e00\u6b21,\u7236\u8fdb\u7a0b\u7ed3\u675f,\u518d\u5237\u65b0\u4e00\u6b21<\/p>\n

\u56db,\u8bbe\u8ba1\u7b80\u5355\u7684libc\u5e93<\/h2>\n

mystdio.c<\/p>\n

#include"mystdio.h"
\n 2 #include<string.h>
\n 3 MyFile*bymyfile(int flag,int fd )
\n 4 {
\nE> 5 MyFile*file=(Myfile*)malloc(sizeof(MyFile));
\n 6 file->filefd=fd;
\n 7 file->flag=flag;
\n 8 file->flushflag=Line_flush;
\n 9 file->bufferlen=0;
\n 10 memset(file->outbuffer,0,sizeof(file->outbuffer));
\n 11 }
\nE> 12 MyFile*Myfileopenl(const char* path,cosnt char*mode)
\n 13 {
\n 14 int fd=-1;
\n 15 int flag=0;
\nE> 16 if(strcmp(mode,"w")==0)
\n 17 {
\nE> 18 flag= O_CREAT | O_WRONLY | O_TRUNC;
\nE> 19 fd=open(path,flag,0666);
\n 20
\n 21 }
\nE> 22 else if(strcmp(mode,"a")==0)
\n 23 {
\nE> 24 flag= O_CREAT | O_WRONLY | O_APPEND;
\nE> 25 fd=open(path,flag,0666);
\n 26 }
\nE> 27 else if(strcmp(mode,"r")==0)
\n 28 {
\nE> 29 flag = O_RDWE
\nE> 30 fd=open(path,flag,0666);
\n 31 }
\nE> 32 if(fd ==-1) reutnr NULL;
\n 33 return bymyfile(flag,fd);
\n 34 }
\n 35 void Myfileclose(MyFile*file)
\n 36 {
\n 37 if(file->filefd<0) return;
\n 38 Myflush();
\n 39 close(file->filefd);
\n 40 free(file);
\n 41 }
\n 42 int*Myfilewrite(MyFile*file,const char * ptr,size_t len)
\n 43 {
\n 44 \/\/\u5199\u5165\u5373\u4f7f\u62f7\u8d1d
\n 45 memcpy(file->outbuffer+file->bufferlen,ptr,len);
\n 46 file->bufferlen+=len;
\n 47 \/\/2.\u5c1d\u8bd5\u5224\u65ad\u662f\u5426\u6ee1\u8db3\u5237\u65b0\u6761\u4ef6
\n 48 if(file->flushflag&Line_FLUSH&&file->outbuffer[file->bufferlen-1]=='\\\\n')
\n 49 Myflush(file);
\n 50 }
\n 51 void Myflush(MyFile*file)
\n 52 {
\n 53 if(file->filefd<0) return;
\n 54 \/\/\u5199\u5165\u5373\u662f\u62f7\u8d1d
\n 55 write(file->filefd,file->outbuffer,file->bufferlen);
\n 56 file->bufferlen=0;
\n 57 }<\/p>\n

mystdio.h<\/p>\n

#pragma once 1 #include"mystdio.h"
\n 2 #include<stdio.h> | 2 #include<string.h>
\n 3 #define MAX_SIZE 1024 | 3 MyFile*bymyfile(int flag,int fd )
\n 4 #define none_flush 0001 | 4 {
\n 5 #define Line_flush 0002 |E> 5 MyFile*file=(Myfile*)malloc(sizeof(MyFile));
\n 6 #define ALL_flush 0003 | 6 file->filefd=fd;
\n 7 typedef struct MyFile{ | 7 file->flag=flag;
\n 8 int filefd;\/\/\u6587\u4ef6\u6807\u8bc6\u7b26 | 8 file->flushflag=Line_flush;
\n 9 int flag;\/\/ | 9 file->bufferlen=0;
\n 10 int flushflag; | 10 memset(file->outbuffer,0,sizeof(file->outbuffer));
\n 11 char outbuffer[1024]; | 11 }
\n 12 int bufferlen; |E> 12 MyFile*Myfileopenl(const char* path,cosnt char*mode)
\n 13 } MyFile; | 13 {
\nE> 14 MyFile*Myfileopenl(const char* path,cont char*mode); | 14 int fd=-1;
\n 15 void*Myfileclose(MyFile*file); | 15 int flag=0;
\n 16 int*Myfilewrite(const void *ptr,size_t size,size_t numb,MyFile*file); |E> 16 if(strcmp(mode,"w")==0)
\n 17 void Myflush(MyFile*file); <\/p>\n","protected":false},"excerpt":{"rendered":"

🔥\u4e2a\u4eba\u4e3b\u9875：Milestone-\u91cc\u7a0b\u7891
\n\u2744\ufe0f\u4e2a\u4eba\u4e13\u680f:\u00a0<>\u00a0<><> <><>
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\n1.1
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\n\u4e8c.\u7406\u89e3\u4e00\u5207\u7686\\”\u6587\u4ef6\\”
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\n5.2 \u4e3a\u4ec0\u4e48\u8981\u6709
\n5.3 \u7f13\u51b2\u7c7b\u578b
\n5.4 \u4ee3\u7801\u5b9e\u6218
\n\u56db,\u8bbe\u8ba1\u7b80\u5355\u7684libc\u5e93 \u4e00.\u91cd\u8c08\u91cd\u5b9a\u4e49 <\/p>\n","protected":false},"author":2,"featured_media":72543,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[55,174,58,190,1813,427,398],"topic":[],"class_list":{"0":"post-72544","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","6":"hentry","7":"category-server","8":"tag-c","10":"tag-linux","11":"tag-190","12":"tag-1813","13":"tag-427","14":"tag-398"},"yoast_head":"\n21:\u91cd\u8c08\u91cd\u5b9a\u4e49\u7406\u89e3\u4e00\u5207\u7686\u201c\u6587\u4ef6\u201c\u53ca\u7f13\u5b58\u533a - \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\/72544.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"21:\u91cd\u8c08\u91cd\u5b9a\u4e49\u7406\u89e3\u4e00\u5207\u7686\u201c\u6587\u4ef6\u201c\u53ca\u7f13\u5b58\u533a - 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