{"id":54411,"date":"2025-08-13T05:39:58","date_gmt":"2025-08-12T21:39:58","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/54411.html"},"modified":"2025-08-13T05:39:58","modified_gmt":"2025-08-12T21:39:58","slug":"%e3%80%90linux%e7%b3%bb%e7%bb%9f%e3%80%91%e4%b8%87%e5%ad%97%e8%a7%a3%e6%9e%90%ef%bc%8c%e6%96%87%e4%bb%b6io","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/54411.html","title":{"rendered":"\u3010Linux\u7cfb\u7edf\u3011\u4e07\u5b57\u89e3\u6790\uff0c\u6587\u4ef6IO"},"content":{"rendered":"

\u524d\u8a00：<\/h2>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u4e0a\u6587\u6211\u4eec\u8bb2\u5230\u4e86\u8fdb\u7a0b\u7684\u63a7\u5236，\u4e3b\u8981\u5305\u62ec\u4e86\u8fdb\u7a0b\u7684\u521b\u5efa\u3001\u8fdb\u7a0b\u7684\u7ec8\u6b62\u3001\u8fdb\u7a0b\u7684\u7b49\u5f85\u4ee5\u53ca\u8fdb\u7a0b\u7684\u7a0b\u5e8f\u66ff\u6362……\u3010Linux\u7cfb\u7edf\u3011\u8be6\u89e3，\u8fdb\u7a0b\u63a7\u5236-CSDN\u535a\u5ba2<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u672c\u6587\u6211\u4eec\u6765\u8bb2\u8bb2Linux\u4e2d\u4e0b\u4e00\u4e2a\u91cd\u96be\u70b9：\u6587\u4ef6\u7684IO<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u70b9\u70b9\u5173\u6ce8\u5427\u4f6c~\u00a0_(:\u0437\u300d\u2220)_\u00a0\u00a0<\/p>\n

\n

\u7406\u89e3\u6587\u4ef6<\/h2>\n

\u72ed\u4e49\u7406\u89e3<\/h4>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u6587\u4ef6\u5b58\u50a8\u5728\u78c1\u76d8\u4e2d<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u78c1\u76d8\u7684\u6c38\u4e45\u6027\u5b58\u50a8\u4ecb\u8d28，\u56e0\u6b64\u6587\u4ef6\u5728\u78c1\u76d8\u4e0a\u7684\u5b58\u50a8\u7684\u6c38\u4e45\u7684<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u78c1\u76d8\u662f\u5916\u8bbe<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u5bf9\u6587\u4ef6\u7684\u64cd\u4f5c\u672c\u8d28\u4e0a\u90fd\u662f\u5bf9\u5916\u8bbe\u7684\u8f93\u5165\u8f93\u51fa，\u7b80\u79f0IO<\/span>\u00a0<\/p>\n

\u5e7f\u4e49\u7406\u89e3<\/h4>\n

\u00a0 \u00a0 \u00a0 \u00a0 Linux\u4e0b，\u4e00\u5207\u7686\u6587\u4ef6（\u952e\u76d8\u3001\u663e\u793a\u5668\u3001\u78c1\u76d8\u3001\u7f51\u5361…..\u90fd\u662f\u6587\u4ef6，\u4e0b\u9762\u4f1a\u8be6\u7ec6\u4ecb\u7ecd）<\/p>\n

\u6587\u4ef6\u57fa\u672c\u8ba4\u77e5<\/h4>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u6587\u4ef6 = \u5185\u5bb9 + \u5c5e\u6027<\/span><\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u5bf9\u4e8e0KB\u7684\u7a7a\u6587\u4ef6，\u4e5f\u662f\u8981\u5360\u636e\u7a7a\u95f4\u7684，\u56e0\u4e3a\u6709\u5c5e\u6027<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u6240\u6709\u6587\u4ef6\u64cd\u4f5c\u7684\u672c\u8d28\u90fd\u662f\u5bf9\u6587\u4ef6\u5185\u5bb9\u7684\u64cd\u4f5c\u3001\u6587\u4ef6\u5c5e\u6027\u7684\u64cd\u4f5c<\/p>\n

\u7cfb\u7edf\u89d2\u5ea6<\/h4>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u78c1\u76d8\u7684\u7ba1\u7406\u8005\u662f\u64cd\u4f5c\u7cfb\u7edf<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u6587\u4ef6\u64cd\u4f5c\u7684\u672c\u8d28\u662f\u8fdb\u7a0b\u5bf9\u6587\u4ef6\u7684\u64cd\u4f5c<\/span><\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u6587\u4ef6\u8bfb\u5199\u4e0d\u662f\u901a\u8fc7\u5e93\u51fd\u6570，\u800c\u662f\u901a\u8fc7\u6587\u4ef6\u76f8\u5173\u7684\u7cfb\u7edf\u8c03\u7528\u5b9e\u73b0\u7684，\u5e93\u51fd\u6570\u53ea\u662f\u5c01\u88c5\u4e86\u7cfb\u7edf\u8c03\u7528<\/span>（\u65b9\u4fbf\u7528\u6237\u4f7f\u7528，\u4ee5\u53ca\u4fdd\u8bc1\u4e86\u53ef\u79fb\u690d\u6027）<\/p>\n

\n

<\/h2>\n

C\u6587\u4ef6\u63a5\u53e3<\/h2>\n

fopen：\u6253\u5f00\u6587\u4ef6<\/h4>\n

\"\"\"\"<\/h4>\n

#include <stdio.h><\/p>\n

\/\/\u4ee5w\u65b9\u5f0f(write)\u6253\u5f00\u6587\u4ef6
\nint main()
\n{
\n FILE* fp= fopen("testfile","w");
\n if(!fp)
\n {
\n printf("\u6253\u5f00\u5931\u8d25\\\\n");
\n }
\n else
\n {
\n printf("\u6253\u5f00\u6210\u529f\\\\n");
\n }
\n}<\/p>\n

w：\u82e5\u6587\u4ef6\u5b58\u5728，\u5219\u4f1a\u6e05\u7a7a\u6587\u4ef6\u5185\u5bb9
\n \u82e5\u6587\u4ef6\u4e0d\u5b58\u5728，\u8fd9\u4f1a\u65b0\u5efa\u4e00\u4e2a\u6587\u4ef6<\/p>\n

fopen：\u82e5\u6253\u5f00\u6210\u529f，\u8fd4\u56deFILE\u7c7b\u578b\u7684\u6307\u9488
\n \u82e5\u4e0d\u6210\u529f，\u8fd4\u56deNULL
\n\u8865\u5145：
\n#include <stdio.h>
\nint fclose(FILE *stream);<\/p>\n

\u8868\u793a\u5173\u95ed\u5bf9\u5e94\u7684\u6587\u4ef6 <\/p>\n

\u6f14\u793a：<\/p>\n

\"\"<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u8fd0\u884c\u4e4b\u524d\u5e76\u6ca1\u6709\u6587\u4ef6，\u6267\u884c\u8fdb\u7a0b\u540e\u53d1\u73b0\u65b0\u5efa\u4e86\u6587\u4ef6\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u5411\u65b0\u5efa\u7684\u6587\u4ef6\u5199\u5165\u4e00\u4e9b\u6587\u672c\u4fdd\u5b58\u5e76\u9000\u51fa，\u518d\u8fd0\u884c\u8fdb\u7a0b\u3002<\/p>\n

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

\u00a0 \u00a0 \u00a0 \u00a0 \u6211\u4eec\u53d1\u73b0，\u5199\u51fa\u7684\u6587\u672c\u4fe1\u606f\u88ab\u6e05\u7a7a\u4e86！<\/p>\n<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 <\/span>\u201c a \u201d\u65b9\u5f0f\u4e0b（append）：<\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>\u82e5\u6587\u4ef6\u5b58\u5728，\u5e76\u4e0d\u4f1a\u6e05\u7a7a\u6587\u4ef6，\u5199\u51fa\u4fe1\u606f\u7684\u65f6\u5019\u662f\u91c7\u7528\u8ffd\u52a0\u7684\u65b9\u5f0f\u5199\u5165\u3002<\/span><\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <\/span>\u82e5\u6587\u4ef6\u4e0d\u5b58\u5728，\u5219\u4f1a\u65b0\u5efa\u6587\u4ef6<\/span><\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 <\/span>\u201c r \u201d\u65b9\u5f0f\u6253\u5f00（read）：<\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>\u82e5\u6587\u4ef6\u5b58\u5728，\u5219\u76f4\u63a5\u6253\u5f00，\u4e0d\u91c7\u53d6\u4efb\u4f55\u63aa\u65bd<\/span><\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <\/span>\u82e5\u6587\u4ef6\u4e0d\u5b58\u5728，\u5219\u6253\u5f00\u5931\u8d25，\u8fd4\u56deNULL<\/span><\/p>\n<\/p>\n

fwrite：\u5199\u6587\u4ef6<\/h4>\n

\"\"<\/p>\n

\"\"<\/p>\n

#include <stdio.h>
\nsize_t fwrite(const void *ptr, size_t size, size_t count, FILE *stream);<\/p>\n

ptr：\u6570\u636e\u7684\u6307\u9488
\nsize：\u6570\u636e\u7684\u5927\u5c0f
\nconut：\u8981\u5199\u5165\u7684\u6570\u636e\u9879\u4e2a\u6570
\nstream：\u8981\u5199\u5165\u6570\u636e\u7684\u6587\u4ef6\u7684\u6307\u9488<\/p>\n

\u8fd4\u56de\u503c：\u82e5\u5168\u90e8\u6210\u529f\u5199\u5165，\u8fd4\u56de\u5199\u5165\u7684\u4e2a\u6570
\n \u82e5\u4e2d\u9014\u51fa\u73b0\u9519\u8bef\u6216\u8fbe\u5230\u6587\u4ef6\u672b\u5c3e，\u8fd4\u56de\u5199\u5165\u7684\u4e2a\u6570\u62160
\n#include <stdio.h>
\n#include <string.h>
\n\/\/\u5199\u6587\u4ef6
\nint main()
\n{
\n \/\/\u4e00\u5207\u5bf9\u6587\u4ef6\u5185\u5bb9\u7684\u64cd\u4f5c，\u90fd\u5fc5\u987b\u5148\u6253\u5f00\u6587\u4ef6
\n FILE* fp=fopen("testfile","w");
\n if(!fp)
\n {
\n printf("\u6253\u5f00\u5931\u8d25\\\\n");
\n }
\n else
\n {
\n \/\/\u5199\u6587\u4ef6
\n const char* msg="Yuzuriha\\\\n";
\n fwrite(msg,strlen(msg),1,fp);
\n \/\/\u5199\u5b8c\u4e4b\u540e\u5173\u95ed\u6587\u4ef6
\n fclose(fp);
\n }
\n}<\/p>\n

\"\"<\/p>\n

\u6ce8\u610f：<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 <\/span>\u5411\u6587\u4ef6\u5199\u5165\u6587\u672c\u65f6，\u6211\u4eec\u4e0d\u80fd\u5199\u5165' \\\\0 '\u3002<\/span><\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 <\/span>\u56e0\u4e3a\u6b64\u7b26\u53f7\u662f\u8bed\u8a00\u5b57\u7b26\u4e32\u7279\u6709\u7684，\u6587\u4ef6\u5e76\u4e0d\u8ba4\u8bc6，\u5199\u5165'\\\\0'\u4f1a\u53d8\u6210\u4e71\u7801<\/span><\/p>\n

<\/h4>\n

fread：\u8bfb\u6587\u4ef6<\/h4>\n

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

size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream);<\/p>\n

ptr：\u6307\u5411\u5b58\u50a8\u6570\u636e\u7684\u5185\u5b58\u7f13\u51b2\u533a\u7684\u6307\u9488
\nsize：\u5355\u4e2a\u6570\u636e\u9879\u7684\u5b57\u8282\u5927\u5c0f（\u6bcf\u6b21\u8bfb\u53d6\u7684\u4e2a\u6570）
\nnmemb：\u671f\u671b\u8bfb\u53d6\u7684\u6570\u636e\u9879\u6570\u91cf
\nstream：\u6587\u4ef6\u6307\u9488（\u7531 fopen \u6253\u5f00）<\/p>\n

\u8fd4\u56de\u503c：\u82e5\u5168\u90e8\u6210\u529f\u8bfb\u53d6，\u8fd4\u56de\u8bfb\u53d6\u4e86\u591a\u5c11\u4e2asize
\n \u82e5\u4e2d\u9014\u51fa\u73b0\u9519\u8bef\u6216\u8fbe\u5230\u6587\u4ef6\u672b\u5c3e，\u8fd4\u56de\u8bfb\u53d6\u7684\u4e2a\u6570\u62160
\n#include <stdio.h>
\n#include <string.h><\/p>\n

int main()
\n{
\n FILE* fp=fopen("testfile","r");
\n if(!fp)
\n {
\n printf("\u6253\u5f00\u5931\u8d25");
\n return 1;
\n }
\n const char* msg="Yuzuriha\\\\n";
\n char buffer[20];
\n \/\/ \u8bfb\u53d6\u5230buffer\u4e2d \u4e00\u6b21\u8bfb\u53d6\u5143\u7d20\u7684\u5927\u5c0f \u8bfb\u53d6\u51e0\u6b21 \u4ecefp\u4e2d\u8bfb\u53d6
\n size_t s=fread(buffer,1,strlen(msg),fp);
\n if(s>0)
\n {
\n \/\/\u6dfb\u52a0'\\\\0'
\n buffer[s]=0;
\n printf("%s",buffer);
\n }
\n \/\/\u68c0\u67e5\u6587\u4ef6\u662f\u5426\u5230\u8fbe\u4e86\u6587\u4ef6\u672b\u5c3e
\n else if(feof(fp))
\n printf("\u5230\u8fbe\u6587\u4ef6\u672b\u5c3e");<\/p>\n

fclose(fp);
\n} <\/p>\n

\"\"<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u53ef\u4ee5\u770b\u5230，\u6211\u4eec\u6210\u529f\u7684\u4ece\u6587\u4ef6\u4e2d\u8bfb\u53d6\u5230\u4e86\u5b57\u7b26\u4e32\u3002<\/p>\n

<\/h4>\n

stdin&stdout&stderr<\/h4>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u5728C\u8bed\u8a00\u4e2d，\u4f1a\u9ed8\u8ba4\u5f00\u542f\u4e09\u4e2a\u8f93\u5165\u8f93\u51fa\u6d41：stdin\u3001stdout\u3001stderr<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u5206\u522b\u4ee3\u8868\u6807\u51c6\u8f93\u5165\u3001\u6807\u51c6\u8f93\u51fa\u3001\u6807\u51c6\u9519\u8bef<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u4ed4\u7ec6\u89c2\u5bdf\u53d1\u73b0，\u8fd9\u4e09\u4e2a\u6d41\u7684\u7c7b\u578b\u90fd\u662fFILE*，fopen\u8fd4\u56de\u503c\u7c7b\u578b，\u2f42\u4ef6\u6307\u9488<\/p>\n

#include <stdio.h><\/p>\n

extern FILE *stdin;
\nextern FILE *stdout;
\nextern FILE *stderr;<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0\u4e0a\u9762\u6211\u4eec\u8bb2\u5230\u4e86，\u6587\u4ef6\u7684\u5199\u5165，\u90a3\u4e48\u5047\u8bbe\u6211\u4eec\u60f3\u8981\u5728\u663e\u793a\u5668\u4e0a\u6253\u5370\u6587\u672c，\u5c31\u4e0d\u53ea\u4e00\u79cd\u65b9\u6cd5\u4e86！<\/p>\n

\"\"<\/p>\n

#include <stdio.h><\/p>\n

int main()
\n{
\n const char* msg="hello yuzuriha\\\\n";
\n fprintf(stdout,msg);
\n} <\/p>\n

\"\"<\/p>\n

\n

<\/h2>\n

\u7cfb\u7edf\u6587\u4ef6IO<\/h2>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u6587\u4ef6IO\u4e0d\u4ec5\u4ec5\u53ea\u6709fopen\u3001fwrite\u7b49\u8bed\u8a00\u63d0\u4f9b\u7684\u63a5\u53e3，\u7cfb\u7edf\u4e5f\u6709\u5bf9\u5e94\u7684\u7cfb\u7edf\u8c03\u7528，\u5e76\u4e14\u7cfb\u7edf\u8c03\u7528\u662f\u8bed\u8a00\u63a5\u53e3\u7684\u6839\u672c<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u4e0b\u9762\u6211\u4eec\u5c31\u6765\u770b\u770b，\u6587\u4ef6IO\u7684\u7cfb\u7edf\u8c03\u7528<\/p>\n

\u6807\u5fd7\u4f4d<\/h4>\n

\u8ba4\u8bc6\u4e00\u4e0b：<\/p>\n

\u5fc5\u9009\u6807\u5fd7\u4f4d： O_RDONLY ：\u53ea\u8bfb（r）
\n O_WRONLY ：\u53ea\u5199（w）
\n O_RDWR ： \u8bfb\u5199（r+）<\/p>\n

\u53ef\u9009\u6807\u5fd7\u4f4d： O_CREAT ： \u65b0\u5efa
\n O_APPEND ： \u8ffd\u52a0
\n O_TRUNC ： \u6e05\u7a7a <\/p>\n

\u4ec0\u4e48\u662f\u6807\u5fd7\u4f4d：<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u6807\u5fd7\u4f4d\u662f\u7528\u4e8e\u6307\u5b9a\u6587\u4ef6\u64cd\u4f5c\u7684\u65b9\u5f0f\u3001\u6743\u9650\u3001\u4ee5\u53ca\u4e00\u4e9b\u7279\u6b8a\u884c\u4e3a\u7684\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u6807\u5fd7\u4f4d\u7684\u672c\u8d28\u662f\u6574\u578b\u5e38\u6570，\u901a\u8fc7\u5b8f\u6765\u5c01\u88c5，\u6bcf\u4e00\u4e2a\u6807\u5fd7\u4f4d\u5bf9\u5e94\u4e00\u4e2a\u552f\u4e00\u7684\u4e8c\u8fdb\u5236\u4f4d\u3002<\/span><\/p>\n<\/p>\n

\u6807\u5fd7\u4f4d\u7684\u539f\u7406\u5982\u4e0b：<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u901a\u8fc7\u5b8f\u5c01\u88c5，\u4e0d\u540c\u6807\u5fd7\u4f4d\u4ee3\u8868\u4e0d\u540c\u7684\u529f\u80fd，\u4e0d\u51b2\u7a81\u7684\u6807\u5fd7\u4f4d\u53ef\u4ee5\u6df7\u7528，\u4f7f\u5176\u540c\u65f6\u4f7f\u7528\u591a\u4e2a\u529f\u80fd\u3002<\/p>\n

#include <stdio.h>
\n#define ONE 1 \/\/0000 0000 0000 0001
\n#define TWO 2 \/\/0000 0000 0000 0010
\n#define THREE 4 \/\/0000 0000 0000 0100<\/p>\n

void func(int f)
\n{
\n if(f&ONE)
\n printf("ONE");
\n if(f&TWO)
\n printf("TWO");
\n if(f&THREE)
\n printf("THREE");
\n printf("\\\\n");
\n}<\/p>\n

int main()
\n{
\n func(ONE);
\n func(ONE|TWO);
\n func(ONE|TWO|THREE);
\n} <\/p>\n

\"\"<\/p>\n

<\/h4>\n

open：\u6253\u5f00\u6587\u4ef6<\/h4>\n

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

\u8fd4\u56de\u503c：\u6210\u529f\u8fd4\u56de\u6587\u4ef6\u63cf\u8ff0\u7b26（file descriptor）
\n \u5931\u8d25\u8fd4\u56de -1 <\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u4e0efopen\u662f\u4f7f\u7528\u533a\u522b\u4e0d\u662f\u5f88\u5927，\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u4e00\u6837\u7684，\u7b2c\u4e8c\u4e2a\u53c2\u6570\u7528\u6807\u5fd7\u4f4d\u4ee3\u66ff\u5373\u53ef\u3002<\/p>\n

#include <stdio.h>
\n#include <sys\/types.h>
\n#include <sys\/stat.h>
\n#include <fcntl.h>
\n#include <unistd.h><\/p>\n

int main()
\n{
\n int fd=open("testfile",O_WRONLY|O_CREAT|O_TRUNC);
\n if(fd<0)
\n {
\n perror("open");
\n return 1;
\n } <\/p>\n

printf("\u6253\u5f00\u6210\u529f\\\\n");
\n close(fd);
\n} <\/p>\n

\"\"<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u6211\u4eec\u53ef\u4ee5\u770b\u5230\u6253\u5f00\u6210\u529f\u4e86，\u5e76\u4e14\u4f7f\u7528\u4e863\u6807\u5fd7\u4f4d，\u542b\u4e49\u662f：\u53ea\u8bfb\u3001\u65b0\u5efa\u3001\u6e05\u7a7a\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u5176\u5b9e\u5c31\u76f8\u5f53\u4e0efopen\u7684"w"\u6253\u5f00\u65b9\u5f0f！<\/span><\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u8fd9\u91cc\u6211\u4eec\u6253\u5f00\u7684\u662f\u4e4b\u524d\u5c31\u4ee5\u53ca\u5b58\u5728\u7684\u6587\u4ef6，\u90a3\u6211\u4eec\u518d\u6253\u5f00\u4e0d\u5b58\u5728\u7684\u6587\u4ef6\u770b\u770b\u6548\u679c：<\/p>\n

include <sys\/types.h>
\n#include <sys\/stat.h>
\n#include <fcntl.h>
\n#include <unistd.h><\/p>\n

int main()
\n{
\n int fd=open("newfile",O_WRONLY|O_CREAT|O_TRUNC);
\n if(fd<0)
\n {
\n perror("open");
\n return 1;
\n } <\/p>\n

printf("\u6253\u5f00\u6210\u529f\\\\n");
\n close(fd);
\n} <\/p>\n

\"\"<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u5f88\u597d\u6211\u4eec\u6253\u5f00\u6210\u529f\u4e86，\u4e5f\u540c\u65f6\u65b0\u5efa\u4e86\u4e00\u4e2a\u65b0\u6587\u4ef6\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u4f46\u662f\u6211\u4eec\u53d1\u73b0，\u8fd9\u4e2a\u65b0\u5efa\u6587\u4ef6\u7684\u6743\u9650\u662f\u4e0d\u5bf9\u7684，\u6211\u4eec\u4ece\u6ca1\u6709\u89c1\u8fc7S\u6743\u9650\u3002<\/span><\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u4e8e\u662f\u8fd9\u65f6，\u6211\u4eec\u5c31\u9700\u8981\u4f20\u9012\u7b2c\u4e09\u4e2a\u53c2\u6570\u4e86：mode，\u7ed9\u5b9a\u65b0\u6587\u4ef6\u7684\u6743\u9650\u3002<\/span><\/p>\n

#include <stdio.h>
\n#include <sys\/types.h>
\n#include <sys\/stat.h>
\n#include <fcntl.h>
\n#include <unistd.h><\/p>\n

int main()
\n{
\n int fd=open("newfile",O_WRONLY|O_CREAT|O_TRUNC,0666);
\n if(fd<0)
\n {
\n perror("open");
\n return 1;
\n } <\/p>\n

printf("\u6253\u5f00\u6210\u529f\\\\n");
\n close(fd);
\n}<\/p>\n

\"\"<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u8fd9\u4e0b\u53ef\u4ee5\u770b\u5230\u6743\u9650\u662f\u6b63\u5e38\u7684\u4e86\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u6709\u7ec6\u5fc3\u7684\u540c\u5b66\u53ef\u80fd\u53d1\u73b0\u4e86，\u6587\u4ef6\u6743\u9650\u5e76\u4e0d\u662f\u6211\u4eec\u7ed9\u5b9a\u7684666\u3002\u8fd9\u662f\u56e0\u4e3a\u7cfb\u7edf\u4e2d\u5b58\u5728\u6743\u9650\u63a9\u7801umask\u3002<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u611f\u5174\u8da3\u7684\u540c\u5b66\u53ef\u4ee5\u770b\u770b\u8fd9\u7bc7\u6587\u7ae0：\u3010Linux\u3011\u6743\u9650\u76f8\u5173\u6307\u4ee4_linux \u6743\u9650\u5c55\u793a-CSDN\u535a\u5ba2<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5728：\u76ee\u5f55\u6743\u9650\u95ee\u9898 -> 3.\u7f3a\u7701\u6743\u9650\u3002<\/p>\n<\/p>\n

close：\u5173\u95ed\u6587\u4ef6<\/h4>\n

#include <unistd.h>
\nint close(int fd); \/\/ fd \u4e3a open \u51fd\u6570\u8fd4\u56de\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/p>\n

\u8fd4\u56de\u503c：\u6210\u529f\u8fd4\u56de 0，\u5931\u8d25\u8fd4\u56de -1 <\/p>\n

write：\u5199\u6587\u4ef6<\/h4>\n

#include <unistd.h>
\nssize_t write(int fd, const void *buf, size_t count);<\/p>\n

fd：\u6587\u4ef6\u63cf\u8ff0\u7b26（\u7531 open \u51fd\u6570\u8fd4\u56de，\u6807\u8bc6\u5df2\u6253\u5f00\u7684\u8d44\u6e90）
\nbuf：\u6307\u5411\u5185\u5b58\u4e2d\u5f85\u5199\u5165\u6570\u636e\u7684\u7f13\u51b2\u533a（\u5982\u5b57\u7b26\u4e32\u3001\u5b57\u8282\u6570\u7ec4）
\ncount：\u8bf7\u6c42\u5199\u5165\u7684\u5b57\u8282\u6570<\/p>\n

\u6210\u529f：\u8fd4\u56de\u5b9e\u9645\u5199\u5165\u7684\u5b57\u8282\u6570（\u53ef\u80fd\u5c0f\u4e8e count，\u9700\u5faa\u73af\u5904\u7406）
\n\u5931\u8d25：\u8fd4\u56de -1（\u9700\u901a\u8fc7 errno \u67e5\u770b\u9519\u8bef\u539f\u56e0，\u5982\u8d44\u6e90\u5173\u95ed\u3001\u6743\u9650\u4e0d\u8db3）
\n#include <stdio.h>
\n#include <sys\/types.h>
\n#include <sys\/stat.h>
\n#include <fcntl.h>
\n#include <unistd.h><\/p>\n

int main()
\n{
\n int fd=open("newfile",O_WRONLY|O_CREAT|O_TRUNC,0666);
\n if(fd<0)
\n {
\n perror("open");
\n return 1;
\n } <\/p>\n

const char* msg="hello yuzuriha\\\\n";
\n write(fd,msg,strlen(msg));
\n close(fd);
\n}<\/p>\n

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

read：\u8bfb\u6587\u4ef6<\/h4>\n

#include <unistd.h>
\nssize_t read(int fd, void *buf, size_t count);<\/p>\n

fd：\u6587\u4ef6\u63cf\u8ff0\u7b26（\u7531 open \u51fd\u6570\u8fd4\u56de，\u6807\u8bc6\u5df2\u6253\u5f00\u7684\u8d44\u6e90，\u5982\u6587\u4ef6\u3001socket）
\nbuf：\u6307\u5411\u5185\u5b58\u4e2d\u7528\u4e8e\u63a5\u6536\u6570\u636e\u7684\u7f13\u51b2\u533a（\u9700\u63d0\u524d\u5206\u914d\u7a7a\u95f4，\u5982\u5b57\u7b26\u6570\u7ec4）
\ncount：\u671f\u671b\u8bfb\u53d6\u7684\u6700\u5927\u5b57\u8282\u6570（\u53d7\u7f13\u51b2\u533a\u5927\u5c0f\u9650\u5236）<\/p>\n

\u8fd4\u56de\u503c：
\n\u6210\u529f：\u8fd4\u56de\u5b9e\u9645\u8bfb\u53d6\u7684\u5b57\u8282\u6570（\u53ef\u80fd\u5c0f\u4e8e count，\u5982\u8d44\u6e90\u4e2d\u5269\u4f59\u6570\u636e\u4e0d\u8db3\u6216\u88ab\u4fe1\u53f7\u4e2d\u65ad）
\n\u5230\u8fbe\u672b\u5c3e：\u8fd4\u56de 0（\u5982\u6587\u4ef6\u8bfb\u53d6\u5230\u672b\u5c3e，\u65e0\u66f4\u591a\u6570\u636e）
\n\u5931\u8d25：\u8fd4\u56de -1（\u9700\u901a\u8fc7 errno \u67e5\u770b\u9519\u8bef\u539f\u56e0，\u5982\u8d44\u6e90\u5173\u95ed\u3001\u6743\u9650\u4e0d\u8db3）
\n#include <stdio.h>
\n#include <sys\/types.h>
\n#include <sys\/stat.h>
\n#include <fcntl.h>
\n#include <unistd.h>
\n#include <string.h><\/p>\n

int main()
\n{
\n \/\/\u8bfb\u53d6\u4e0d\u9700\u8981\u65b0\u5efa\u3001\u4e5f\u4e0d\u9700\u8981\u6e05\u7a7a
\n int fd=open("newfile",O_RDNOLY);
\n if(fd<0)
\n {
\n perror("open");
\n return 1;
\n } <\/p>\n

const char* msg="hello yuzuriha\\\\n";
\n char buffer[20];
\n read(fd,buffer,strlen(msg));
\n printf("%s",buffer);
\n \/\/ write(fd,msg,strlen(msg));
\n close(fd);
\n}<\/p>\n

\"\"<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u6211\u4eec\u77e5\u9053C\u8bed\u8a00\u7684\u6587\u4ef6IO\u63a5\u53e3\u662f\u8fd4\u56deFILE* \u7c7b\u578b\u7684\u6307\u9488，\u800c\u7cfb\u7edf\u8c03\u7528\u7684\u63a5\u53e3\u662f\u8fd4\u56defd\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u8bed\u8a00\u5c42\u7684\u63a5\u53e3\u5e95\u5c42\u662f\u4e00\u5b9a\u5c01\u88c5\u4e86\u7cfb\u7edf\u8c03\u7528\u7684，\u6240\u4ee5FILE\u4e2d\u4e00\u5b9a\u662f\u5c01\u88c5\u4e86fd<\/span>\u4e86\u7684\u3002\u00a0 \u00a0 \u00a0 \u00a0\u00a0<\/p>\n<\/p>\n

fd：\u6587\u4ef6\u63cf\u8ff0\u7b26<\/h4>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u7cfb\u7edf\u8c03\u7528\u63a5\u53e3open\u4f1a\u8fd4\u56defd，write\u4e0eread\u4e5f\u4f9d\u9760fd\u6765\u5b9a\u4f4d\u6587\u4ef6\u3002\u3001<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u90a3\u4e48fd\u5230\u5e95\u662f\u4e2a\u4ec0\u4e48\u4e1c\u897f？<\/p>\n

\u6211\u4eec\u5148\u591a\u770b\u770b\u51e0\u4e2a\u6587\u4ef6\u7684fd：<\/p>\n

#include <stdio.h>
\n#include <sys\/types.h>
\n#include <sys\/stat.h>
\n#include <fcntl.h>
\n#include <unistd.h>
\n#include <string.h><\/p>\n

int main()
\n{<\/p>\n

int fd1=open("h1",O_WRONLY|O_REAET|,0666);
\n int fd2=open("h2",O_WRONLY|O_REAET|,0666);
\n int fd3=open("h3",O_WRONLY|O_REAET|,0666);
\n int fd4=open("h4",O_WRONLY|O_REAET|,0666);<\/p>\n

printf("fd1:%d\\\\n",fd1);
\n printf("fd2:%d\\\\n",fd2);
\n printf("fd3:%d\\\\n",fd3);
\n printf("fd4:%d\\\\n",fd4);<\/p>\n

} <\/p>\n

\"\"<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u770b\u5230\u8fde\u7eed\u9012\u589e\u7684\u6570，\u4e0d\u77e5\u9053\u5927\u5bb6\u4f1a\u8054\u60f3\u5230\u4ec0\u4e48？\u6570\u7ec4\u4e0b\u6807？<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u5bf9\u6ca1\u9519，\u5c31\u662f\u6570\u7ec4\u4e0b\u6807\u3002\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 fd\u7684\u672c\u8d28\u5c31\u662f\u6570\u7ec4\u4e0b\u6807！<\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\"\"<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u5bf9\u6587\u4ef6\u7684\u64cd\u4f5c，\u672c\u8d28\u662f\u8fdb\u7a0b\u5bf9\u6587\u4ef6\u7684\u64cd\u4f5c<\/span>\u3002\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u8fdb\u7a0b\u7684PCB\u4e2d，\u6709\u4e00\u4e2a\u6307\u9488：struct files_struct* files，\u6307\u5411\u4e00\u4e2a\u7ed3\u6784\u4f53：struct file_struct\u3002\u800c\u8fd9\u4e2a\u7ed3\u6784\u4f53\u4e2d\u6709\u6307\u9488\u6570\u7ec4：fd_array[ ]，\u7528\u4e8e\u4fdd\u5b58\u4e0d\u540c\u6587\u4ef6\u5c5e\u6027\u7684\u7ed3\u6784\u4f53\u5730\u5740\u3002\u6211\u4eec\u6240\u8bb2\u7684fd\u5176\u5b9e\u5c31\u662f\u8fd9\u4e2a\u6570\u7ec4\u7684\u4e0b\u6807<\/span>\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u6211\u4eec\u77e5\u9053\u6587\u4ef6=\u5c5e\u6027+\u5185\u5bb9<\/span>\u3002\u5c5e\u6027\u7531\u7ed3\u6784\u4f53struct file\u4fdd\u5b58<\/span>，\u800c\u5185\u5bb9\u8981\u52a0\u8f7d\u5230\u6587\u4ef6\u7f13\u51b2\u533a\u4e2d<\/span>\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u8865\u5145：\u7cfb\u7edf\u4f1a\u9ed8\u8ba4\u6253\u5f003\u4e2a\u8f93\u51fa\u6d41：\u6807\u51c6\u8f93\u5165\u3001\u6807\u51c6\u8f93\u51fa\u3001\u6807\u51c6\u9519\u8bef，\u5206\u522b\u5360\u7528fd：0\u30011\u30012\u3002\u6240\u4ee5\u6211\u4eec\u4e0a\u9762\u7684\u770b\u5230\u7684\u6587\u4ef6fd\u662f\u4ece3\u5f00\u59cb\u7684<\/span>\u3002<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/p>\n

fd\u7684\u5206\u914d\u89c4\u5219<\/h4>\n

\u00a0 \u00a0 \u00a0 \u00a0 <\/span>\u5206\u914d\u89c4\u5219\u4e3a：\u5206\u914d\u6ca1\u6709\u88ab\u5360\u7528\u7684\u6700\u5c0f\u7684fd<\/span><\/p>\n

\u9a8c\u8bc1：<\/p>\n

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

\u00a0 \u00a0 \u00a0 \u00a0 \u5173\u95ed\u4e86fd=0\u7684\u4f4d\u7f6e，\u6211\u4eec\u53ef\u4ee5\u53d1\u73b0\u4e4b\u524d\u65b0\u6253\u5f00\u7684\u6587\u4ef6\u5c31\u5360\u7528\u4e86fd=0\u7684\u4f4d\u7f6e\u3002<\/p>\n<\/p>\n

\u91cd\u5b9a\u5411<\/h4>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5728\u6211\u4eec\u4e4b\u524d\u5b66\u4e60Linux\u6307\u4ee4\u7684\u65f6\u5019，\u5c31\u5df2\u7ecf\u4e86\u89e3\u8fc7\u4e86\u91cd\u5b9a\u5411，\u4e0b\u9762\u6211\u4eec\u6765\u770b\u770b\u91cd\u5b9a\u5411\u662f\u5982\u4f55\u5b9e\u73b0\u7684\u3010Linux\u3011\u521d\u89c1，\u57fa\u7840\u6307\u4ee4-CSDN\u535a\u5ba2<\/p>\n

\"\"<\/p>\n

\u00a0\u91cd\u5b9a\u5411\u7684\u672c\u8d28\u662f：<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u8ba9\u5176\u4ed6\u6587\u4ef6\u5360\u7528\u8f93\u5165\u8f93\u51fa，\u8ba9\u5176\u4ed6\u6587\u4ef6\u4ee3\u66ffstdin\u3001stdout\u3002<\/p>\n

\"\"<\/p>\n

#include <stdio.h>
\n#include <sys\/types.h>
\n#include <sys\/stat.h>
\n#include <fcntl.h>
\n#include <unistd.h>
\n#include <string.h><\/p>\n

int main()
\n{
\n close(1);
\n \/\/h\u6587\u4ef6\u83b7\u5f97fd=1
\n int fd=open("testfile",O_WRONLY|O_CREAT,0666);
\n} <\/p>\n

dup2\u63a5\u53e3<\/h5>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u4f7f\u7528dup2\u63a5\u53e3，\u6211\u4eec\u5c31\u53ef\u4ee5\u4e00\u952e\u5b8c\u6210\u4e0a\u9762\u7684\u64cd\u4f5c，\u4e0d\u7528\u5173\u95ed\u3001\u6253\u5f00….\u8fd9\u4e9b\u7e41\u7410\u7684\u6b65\u9aa4！<\/p>\n

#include <unistd.h>
\nint dup2(int oldfd, int newfd);<\/p>\n

\u6838\u5fc3\u4f5c\u7528\u662f\u5c06\u65b0\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26 newfd \u6307\u5411\u65e7\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26 oldfd \u6240\u5173\u8054\u7684\u6587\u4ef6
\n\u4f7f\u5f97\u4e24\u4e2a\u63cf\u8ff0\u7b26\u6700\u7ec8\u6307\u5411\u540c\u4e00\u4e2a\u6587\u4ef6<\/p>\n

\u8fd4\u56de\u503c
\n\u6210\u529f：\u8fd4\u56de\u65b0\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26 newfd
\n\u5931\u8d25：\u8fd4\u56de -1，\u5e76\u8bbe\u7f6e\u5168\u5c40\u53d8\u91cf errno \u4ee5\u6307\u793a\u9519\u8bef\u539f\u56e0 <\/p>\n

\u8f93\u51fa\u91cd\u5b9a\u5411<\/h5>\n

#include <stdio.h>
\n#include <sys\/types.h>
\n#include <sys\/stat.h>
\n#include <fcntl.h>
\n#include <unistd.h>
\n#include <string.h><\/p>\n

\/\/\u8f93\u51fa\u91cd\u5b9a\u5411：\u6253\u5370\u4fe1\u606f\u4e0d\u5728\u663e\u793a\u5668，\u800c\u5728\u5176\u4ed6\u6587\u4ef6
\nint main()
\n{
\n int fd=open("myfile",O_WRONLY|O_CREAT,0666);
\n if(fd<0)
\n {
\n perror("open");
\n return 1;
\n } <\/p>\n

dup2(fd,1);\/\/\u8ba91\u6307\u5411fd\u5173\u8054\u7684\u6587\u4ef6
\n printf("%s","\u4f60\u597d\u4e16\u754c\\\\n");
\n} <\/p>\n

\"\"<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u6211\u4eec\u53ef\u4ee5\u770b\u5230，\u4fe1\u606f\u6253\u5370\u5230\u4e86myfile\u6587\u4ef6\u4e2d<\/p>\n<\/p>\n

\u8f93\u5165\u91cd\u5b9a\u5411<\/h5>\n

#include <stdio.h>
\n#include <sys\/types.h>
\n#include <sys\/stat.h>
\n#include <fcntl.h>
\n#include <unistd.h>
\n#include <string.h><\/p>\n

\/\/\u8f93\u5165\u91cd\u5b9a\u5411
\nint main()
\n{
\n int fd=open("myfile", O_RDONLY);
\n if(fd<0)
\n {
\n perror("open");
\n return 1;
\n } <\/p>\n

char buffer[20];
\n dup2(fd,0);\/\/\u8ba90\u6307\u5411fd\u7684\u5173\u8054\u6587\u4ef6
\n int n=read(0,buffer,sizeof(buffer)-1); \/\/\u4ece0\u8bfb\u53d6\u4fe1\u606f，\u8bfb\u53d6\u5230buffer\u4e2d
\n if(n==-1)
\n perror("read failed");
\n else
\n buffer[n]=0; \/\/\u6dfb\u52a0\\\\0
\n printf("%s\\\\n",buffer);
\n} <\/p>\n

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

\u6807\u51c6\u9519\u8bef<\/h5>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u9519\u8bef\u4fe1\u606f\u4e0e\u8f93\u51fa\u4fe1\u606f，\u5176\u5b9e\u90fd\u662f\u6253\u5370\u5728\u663e\u793a\u5668\u4e0a\u7684，\u8fd9\u4e5f\u5c31\u610f\u5473\u8fd9\u5b83\u4eec\u90fd\u6307\u5411\u540c\u4e00\u4e2a\u6587\u4ef6<\/span>\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u6253\u5370\u9519\u8bef\u3001\u6253\u5370\u4fe1\u606f\u662f\u4e0d\u540c\u7684\u51fd\u6570：perror\u3001printf\u3002\u8fd9\u662f\u56e0\u4e3a\u4f7f\u7528\u4e86\u91cd\u5b9a\u5411，\u628a\u5e38\u89c4\u4fe1\u606f\u4e0e\u9519\u8bef\u4fe1\u606f\u8fdb\u884c\u4e86\u5206\u79bb！<\/span><\/p>\n

#include <stdio.h>
\n#include <sys\/types.h>
\n#include <sys\/stat.h>
\n#include <fcntl.h>
\n#include <unistd.h>
\n#include <string.h><\/p>\n

int main()
\n{
\n printf("hello\\\\n");
\n perror("erro");
\n} <\/p>\n

\"\"<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u5982\u4e0a\u56fe，\u76f4\u63a5\u8fd0\u884c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u4fe1\u606f\u90fd\u6253\u5370\u51fa\u6765\u4e86\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u4f46\u662f\u5f53\u6211\u5c06\u8f93\u51fa\u91cd\u5b9a\u5411\u5230log.txt\u6587\u4ef6\u4e2d，\u53d1\u73b0\u9519\u8bef\u4fe1\u606f\u5e76\u6ca1\u6709\u91cd\u5b9a\u5411，\u800c\u662f\u6253\u5370\u4e86\u51fa\u6765，\u8fd9\u662f\u4e3a\u4ec0\u4e48？<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u56e0\u4e3a\u8f93\u51fa\u91cd\u5b9a\u5411，\u662f\u9488\u5bf9\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e3a1\u7684\u6587\u4ef6，\u6240\u4ee5\u5bf9\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e3a2\u7684\u6587\u4ef6\u65e0\u6548\u3002<\/p>\n

\u5176\u5b8c\u6574\u5199\u6cd5\u4e3a：<\/p>\n

.\/sysIO 1>log.txt <\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u60f3\u8981\u90fd\u5199\u5165log.txt\u4e2d\u6709\u4e24\u79cd\u65b9\u6cd5：<\/p>\n

\u6cd5\u4e00：
\nhyc@hyc-alicloud:~\/linux\/\u6587\u4ef6IO$ .\/sysIO 1>log.txt 2>>log.txt
\nhyc@hyc-alicloud:~\/linux\/\u6587\u4ef6IO$ cat log.txt
\nhello
\nSuccess<\/p>\n

\u6cd5\u4e8c：\u63a8\u8350！
\nhyc@hyc-alicloud:~\/linux\/\u6587\u4ef6IO$ .\/sysIO 1>log.txt 2>&1
\n（&1 \u662f Shell \u8bed\u6cd5\u7684\u4e00\u90e8\u5206，\u7528\u4e8e \u5f15\u7528\u6587\u4ef6\u63cf\u8ff0\u7b26）
\nhyc@hyc-alicloud:~\/linux\/\u6587\u4ef6IO$ cat log.txt
\nerro: Success
\nhello<\/p>\n

\n

\u7406\u89e3\u201c\u4e00\u5207\u7686\u6587\u4ef6\u201d<\/h2>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5728windows\u4e2d\u662f\u6587\u4ef6\u7684\u4e1c\u897f，\u5b83\u4eec\u5728linux\u4e2d\u4e5f\u662f\u6587\u4ef6；\u5176\u6b21\u2f00\u4e9b\u5728windows\u4e2d\u4e0d\u662f\u6587\u4ef6\u7684\u4e1c\u897f，\u6bd4\u5982\u8fdb\u7a0b\u3001\u78c1\u76d8\u3001\u663e\u793a\u5668\u3001\u952e\u76d8\u8fd9\u6837\u786c\u4ef6\u8bbe\u5907\u4e5f\u88ab\u62bd\u8c61\u6210\u4e86\u6587\u4ef6，\u4f60\u53ef\u4ee5\u4f7f\u7528\u8bbf\u95ee\u6587\u4ef6\u7684\u65b9\u6cd5\u8bbf\u95ee\u5b83\u4eec\u83b7\u5f97\u4fe1\u606f<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u50cf\u8fdb\u7a0b\u3001\u78c1\u76d8\u3001\u663e\u793a\u5668\u3001\u952e\u76d8\u8fd9\u6837\u7684\u786c\u4ef6\u8bbe\u5907，\u662f\u901a\u8fc7\u9a71\u52a8\u7a0b\u5e8f（struct device）\u7ba1\u7406\u7684，\u800c\u6307\u5411\u9a71\u52a8\u7a0b\u5e8f\u7684\u6307\u9488\u662f\u5b58\u653e\u5728struct file\u4e2d\u7684\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u800c\u5bf9\u4e8estruct file，\u6211\u4eec\u4e0a\u9762\u8bb2\u5230\u4e86\u5982\u4e0b\u5173\u7cfb：<\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u4e0a\u56fe\u4e2d\u7684\u5916\u8bbe，\u6bcf\u4e2a\u8bbe\u5907\u90fd\u53ef\u4ee5\u6709\u81ea\u5df1\u7684read\u3001write，\u4f46\u2f00\u5b9a\u662f\u5bf9\u5e94\u7740\u4e0d\u540c\u7684\u64cd\u4f5c\u65b9\u6cd5！\u4f46\u901a\u8fc7 struct file \u4e0b file_operation \u4e2d\u7684\u5404\u79cd\u51fd\u6570\u56de\u8c03，\u8ba9\u6211\u4eec\u5f00\u53d1\u8005\u53ea\u7528file\u4fbf\u53ef\u8c03\u53d6Linux\u7cfb\u7edf\u4e2d\u7edd\u5927\u90e8\u5206\u7684\u8d44\u6e90！\u8fd9\u4fbf\u662f\u201clinux\u4e0b\u4e00\u5207\u7686\u6587\u4ef6\u201d\u7684\u6838\u5fc3\u7406\u89e3\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 Linux\u4e0b\u4e00\u5207\u7686\u6587\u4ef6！<\/p>\n

\n

\u7f13\u51b2\u533a<\/h2>\n

\u4ec0\u4e48\u662f\u7f13\u51b2\u533a？<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u5185\u5b58\u4e2d\u7684\u4e00\u6bb5\u7a7a\u95f4\u3002<\/p>\n

\u4e3a\u4ec0\u4e48\u8981\u5f15\u5165\u7f13\u51b2\u533a？<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u63d0\u9ad8\u6548\u7387：\u63d0\u9ad8\u4f7f\u7528\u8005\u7684\u6548\u7387\u3002<\/p>\n

\u4ee3\u7801\u4e00：
\n#include <stdio.h>
\n#include <sys\/stat.h>
\n#include <fcntl.h>
\n#include <unistd.h>
\n#include <string.h><\/p>\n

int main()
\n{
\n close(1);
\n int fd = open("log.txt", O_WRONLY | O_CREAT | O_TRUNC, 0666);
\n if (fd < 0)
\n {
\n perror("open");
\n return 1;
\n } <\/p>\n

printf("fd:%d",fd);
\n printf("hello Yuzuriha\\\\n");
\n printf("hello Yuzuriha\\\\n");
\n printf("hello Yuzuriha\\\\n");<\/p>\n

const char* msg="\u4f60\u597d\\\\n";
\n write(fd,msg,strlen(msg));
\n}<\/p>\n

\u4ee3\u7801\u4e8c：
\n#include <stdio.h>
\n#include <sys\/stat.h>
\n#include <fcntl.h>
\n#include <unistd.h>
\n#include <string.h><\/p>\n

int main()
\n{
\n close(1);
\n int fd = open("log.txt", O_WRONLY | O_CREAT | O_TRUNC, 0666);
\n if (fd < 0)
\n {
\n perror("open");
\n return 1;
\n } <\/p>\n

printf("fd:%d",fd);
\n printf("hello Yuzuriha\\\\n");
\n printf("hello Yuzuriha\\\\n");
\n printf("hello Yuzuriha\\\\n");<\/p>\n

const char* msg="\u4f60\u597d\\\\n";
\n write(fd,msg,strlen(msg));
\n close(fd);
\n} <\/p>\n

\u4ee3\u7801\u4e00：<\/p>\n

\"\"<\/p>\n

\u4ee3\u7801\u4e8c：<\/p>\n

\"\"<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u6211\u4eec\u53d1\u73b0\u4ee3\u7801\u4e8c，\u5176\u5b9e\u5c31\u6bd4\u4ee3\u7801\u4e00，\u5728\u7ed3\u5c3e\u591a\u4e86\u4e00\u4e2aclose\u7684\u51fd\u6570\u3002\u4e3a\u4ec0\u4e48\u5e93\u51fd\u6570\u6253\u5370\u7684\u4fe1\u606f\u6ca1\u6709\u4e86？<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u5982\u4e0b\u56fe：<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u5b9e\u9645\u4e0a\u6211\u4eec\u5b58\u5728\u4e24\u79cd\u7f13\u51b2\u533a：\u8bed\u8a00\u5c42\u7f13\u51b2\u533a（\u7528\u6237\u7ea7）\u3001\u6587\u4ef6\u7f13\u51b2\u533a（\u5185\u6838\u7ea7）<\/span>\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u800c\u6211\u4eec\u4f7f\u7528\u8bed\u8a00\u63a5\u53e3<\/span>\u7684\u8bdd，\u6570\u636e\u4f1a\u5148\u52a0\u8f7d\u5230\u8bed\u8a00\u5c42\u7684\u7f13\u51b2\u533a<\/span>，\u6ee1\u8db3\u6761\u4ef6\u540e\u624d\u4f1a\u5237\u65b0\u5230\u6587\u4ef6\u7f13\u51b2\u533a（\u5185\u6838\u7ea7）\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u6211\u4eec\u4f7f\u7528\u7cfb\u7edf\u63a5\u53e3<\/span>\u7684\u8bdd，\u6570\u636e\u5219\u4f1a\u76f4\u63a5\u52a0\u8f7d\u5230\u6587\u4ef6\u7f13\u51b2\u533a（\u5185\u6838\u7ea7）<\/span>\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u518d\u770b\u6211\u4eec\u4e0a\u9762\u7684\u4ee3\u7801，\u6211\u4eec\u4f1a\u53d1\u73b0，\u5728\u8fdb\u7a0b\u8fd8\u6ca1\u6709\u9000\u51fa\u7684\u65f6\u5019，\u6587\u4ef6\u5c31\u5df2\u7ecf\u5173\u95ed\u4e86\u3002\u5f53\u8fdb\u7a0b\u9000\u51fa，\u60f3\u8981\u901a\u8fc7\u6587\u4ef6\u63cf\u8ff0\u7b26（fd）\u627e\u5230\u5bf9\u5e94\u7684struct_file\u3001\u6587\u4ef6\u7f13\u51b2\u533a\u65f6，\u53d1\u73b0\u5df2\u7ecf\u627e\u4e0d\u5230\u4e86！\u4e8e\u662f\u6570\u636e\u6ca1\u80fd\u6210\u529f\u5237\u65b0\u5230\u6587\u4ef6\u7f13\u51b2\u533a！<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u8865：\u5176\u5b9e\u4e0d\u8bba\u662f\u52a0\u8f7d\u3001\u5237\u65b0\u6216\u662f\u5176\u4ed6\u7684\u6570\u636e\u6d41\u52a8，\u5176\u672c\u8d28\u90fd\u662f\u62f7\u8d1d！\u4e0d\u8981\u60f3\u590d\u6742\u4e86！<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u8ba1\u7b97\u673a\u6570\u636e\u6d41\u52a8\u7684\u672c\u8d28\u90fd\u662f：\u62f7\u8d1d！<\/span><\/p>\n

\"\"<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 C\u8bed\u8a00\u5e93\u7684\u5237\u65b0\u89c4\u5219\u5982\u56fe，\u5176\u4e2d\u5f3a\u5236\u5237\u65b0\u4f7f\u7528：fflush\u51fd\u6570\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u5f53\u7136，\u6587\u4ef6\u7f13\u51b2\u533a（\u5185\u6838\u7ea7）\u4e5f\u6709\u5bf9\u5e94\u7684\u5237\u65b0\u89c4\u5219，\u4f46\u6211\u4eec\u5e76\u4e0d\u5173\u5fc3，\u7531OS\u81ea\u4e3b\u51b3\u5b9a！<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 <\/span>\u53e6\u5916，\u6211\u4eec\u5e38\u8bf4\u7684\u7f13\u51b2\u533a\u90fd\u662f\u8bf4\u7684\u662f：\u8bed\u8a00\u5c42\u7684\u7f13\u51b2\u533a！<\/span>\u00a0 \u00a0 \u00a0 \u00a0\u00a0<\/p>\n<\/p>\n

\u7f13\u51b2\u533a\u5728\u54ea\u91cc？<\/h4>\n

\u8bed\u8a00\u5c42\u7f13\u51b2\u533a（\u7528\u6237\u7ea7）：<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u6211\u4eec\u90fd\u77e5\u9053C\u8bed\u8a00\u7684\u6587\u4ef6\u7ba1\u7406\u662f\u6709\u4e00\u4e2aFILE\u7684，\u90a3\u4e48FILE\u662f\u4ec0\u4e48\u5462？<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u5176\u5b9eFILE\u662f\u4e00\u4e2a\u7531C\u8bed\u8a00\u63d0\u4f9b\u7684\u7ed3\u6784\u4f53，C\u8bed\u8a00\u7684\u7f13\u51b2\u533a\u5177\u4f53\u5b58\u653e\u4f4d\u7f6e\u4e0d\u5355\u4e00，\u4f46FILE \u7ed3\u6784\u4f53\u4fdd\u5b58\u4e86\u6307\u5411\u7f13\u51b2\u533a\u7684\u5730\u5740，\u8fd9\u6837\u5c31\u80fd\u627e\u5230\u5e76\u64cd\u4f5c\u7f13\u51b2\u533a！<\/span><\/p>\n<\/p>\n

\u6587\u4ef6\u7f13\u51b2\u533a（\u5185\u6838\u7ea7）<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u5185\u6838\u7ea7\u7f13\u51b2\u533a\u5b58\u653e\u5728\u5185\u5b58\u4e2d\u7684，\u5bf9\u5e94\u5728\u865a\u62df\u5730\u5740\u7a7a\u95f4\u4e2d\u7684\u5185\u6838\u7a7a\u95f4\u3002<\/p>\n

\"\"<\/p>\n","protected":false},"excerpt":{"rendered":"

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