{"id":1261,"date":"2010-09-02T21:02:46","date_gmt":"2010-09-02T13:02:46","guid":{"rendered":"http:\/\/edsionte.com\/techblog\/?p=1261"},"modified":"2010-09-24T13:49:43","modified_gmt":"2010-09-24T05:49:43","slug":"%e6%96%87%e4%bb%b6%e6%93%8d%e4%bd%9c%e6%80%bb%e7%bb%93","status":"publish","type":"post","link":"http:\/\/edsionte.com\/techblog\/archives\/1261","title":{"rendered":"\u6587\u4ef6\u64cd\u4f5c\u5b66\u4e60\u7b14\u8bb0(1)"},"content":{"rendered":"

\u5b66\u4e60linuxC\u8bed\u8a00\u6709\u4e00\u9635\u5b50\u4e86\uff0c\u8fd9\u91cc\u6700\u91cd\u8981\u6700\u57fa\u7840\u7684\u90e8\u5206\u5f53\u5c5e\u6587\u4ef6\u64cd\u4f5c\u90e8\u5206\u4e86\uff0c\u6240\u4ee5\u5f88\u6709\u5fc5\u8981\u5728\u5b66\u4e60\u4e00\u6bb5\u65f6\u95f4\u540e\u603b\u7ed3\u4e00\u4e0b\u76f8\u5173\u77e5\u8bc6\u3002<\/p>\n

1.linux\u6587\u4ef6\u7cfb\u7edf\u6700\u7a81\u51fa\u7684\u4e00\u4e2a\u7279\u70b9\u5c31\u662f\u5bf9\u7528\u6237\u8bbf\u95ee\u6743\u9650\u7684\u63a7\u5236\uff0c\u5373\u91c7\u7528ugo\u7684\u8bbf\u95ee\u63a7\u5236\u5f62\u5f0f\u3002<\/p>\n

2.\u5728linuxC\u8bed\u8a00\u4e2d\u6240\u6d89\u53ca\u7684\u6587\u4ef6\u8f93\u5165\u8f93\u51fa\u51fd\u6570\uff0c\u6bd4\u5982open\uff0ccreat\uff0cread\u7b49\uff0c\u5747\u4e0d\u662f\u6807\u51c6C\u4e0b\u7684\u5e93\u51fd\u6570\uff0c\u56e0\u6b64\u7528\u4e0a\u8ff0\u51fd\u6570\u6240\u7f16\u5199\u7684\u7a0b\u5e8f\u4e0d\u65b9\u4fbf\u79fb\u690d\u3002\u4f46\u662f\u8fd9\u4e9b\u51fd\u6570\u6bd4\u6807\u51c6C\u4e0b\u6240\u5bf9\u5e94\u7684\u8f93\u5165\u8f93\u51fa\u51fd\u6570\u901f\u5ea6\u8981\u5feb\u7684\u591a\uff0c\u56e0\u4e3a\u5b83\u4eec\u76f4\u63a5\u6761\u7528\u64cd\u4f5c\u7cfb\u7edf\u3002<\/p>\n

\u63d0\u5230\u8fd9\u4e9b\u51fd\u6570\uff0c\u6211\u4eec\u5c31\u4e0d\u80fd\u4e0d\u63d0\u5230\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002\u8fd9\u4e5f\u662fLinuxC\u4e0e\u6807\u51c6C\u5728\u6587\u4ef6\u64cd\u4f5c\u90e8\u5206\u7684\u4e00\u5927\u4e0d\u540c\u70b9\u3002\u6211\u4eec\u53ef\u4ee5\u56de\u60f3\u5728\u6807\u51c6C\u4e0b\u6211\u4eec\u901a\u5e38\u6253\u5f00\u6587\u4ef6\uff0c\u8fd4\u56de\u7684\u662f\u4e00\u4e2aFILE\u7c7b\u578b\u7684\u6307\u9488\uff1b\u800c\u5728LinuxC\u4e0b\u6211\u4eec\u5219\u8fd4\u56de\u4e00\u4e2a\u6574\u5f62\u53d8\u91cf\u2014\u2014\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/p>\n

3.open\u51fd\u6570\u53ef\u4ee5\u6253\u5f00\u6700\u591a\u6709\u4e09\u4e2a\u53c2\u6570\u3002\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u6253\u5f00\u6587\u4ef6\u7684\u65b9\u5f0f\uff0c\u53ea\u80fd\u53d6O_RDONLY\uff0cO_WRONLY\uff0cO_RDWR\u4e2d\u7684\u4e00\u4e2a\u3002\u901a\u5e38\u4e0a\u9762\u7684\u53c2\u6570\u8fd8\u4f1a\u4e0e\u5176\u4ed6\u4e00\u4e9b\u6807\u5fd7\u8fdb\u884c\u8d27\u8fd0\u7b97\u3002\u8fd9\u91cc\u53ea\u8bf4\u4e24\u79cd\u6700\u5178\u578b\u7684\u60c5\u51b5\u3002<\/p>\n

O_CREAT|O_EXCL|O_WRONLY:\u8fd9\u79cd\u60c5\u51b5\u53ea\u9002\u5408\u6253\u5f00\u4e00\u4e2a\u4e0d\u5b58\u5728\u7684\u6587\u4ef6\uff1b\u5982\u679c\u8981\u6253\u5f00\u7684\u6587\u4ef6\u5b58\u5728\uff0c\u90a3\u4e48\u5219\u4f1a\u8fd4\u56de\u9519\u8bef\u6807\u5fd7\u3002\u5e76\u4e14\u6b64\u65f6\u4f1a\u7528\u5230\u7b2c\u4e09\u4e2a\u53c2\u6570\uff1a\u5b58\u53d6\u6743\u9650\u3002\u8fd9\u91cc\u5e94\u8be5\u6ce8\u610f\u6587\u4ef6\u7684\u5b58\u53d6\u6743\u9650\u548c\u6253\u5f00\u65b9\u5f0f<\/strong>\u662f\u4e24\u4e2a\u4e0d\u540c\u7684\u6982\u5ff5\u3002\u5177\u4f53\u53ef\u53c2\u770b\u8fd9\u91cc<\/a>\u7684\u6587\u7ae0\u3002<\/p>\n

O_CREAT|O_TRUNC|O_WRONLY:\u8fd9\u79cd\u60c5\u51b5\u5373\u9002\u5408\u6253\u5f00\u4e00\u4e2a\u5df2\u5b58\u5728\u7684\u6587\u4ef6\uff0c\u53c8\u9002\u5408\u6253\u5f00\u4e00\u4e2a\u4e0d\u5b58\u5728\u7684\u6587\u4ef6\u3002\u5982\u679c\u8981\u6253\u5f00\u7684\u6587\u4ef6\u5b58\u5728\uff0c\u90a3\u4e48\u4f1a\u81ea\u52a8\u4f1a\u6e05\u7a7a\u539f\u6587\u4ef6\u4e2d\u7684\u6570\u636e\uff0c\u5373\u6587\u4ef6\u957f\u5ea6\u4e3a0\u3002\u4f46\u662f\u6587\u4ef6\u7684\u5c5e\u6027\u4e0d\u53d8\uff0c\u4e5f\u5c31\u662f\u8bf4\u7b2c\u4e09\u4e2a\u53c2\u6570\u6b64\u65f6\u5931\u6548\u3002<\/p>\n

\u4e0a\u9762\u6211\u4eec\u8bf4\u5230\u4e86\u7b2c\u4e09\u4e2a\u53c2\u6570mode\uff0c\u5b83\u7528\u6765\u8bf4\u660e\u6587\u4ef6\u7684\u5b58\u53d6\u6743\u9650\u3002\u4f46\u662f\u5b9e\u9645\u4e0a\u5b58\u53d6\u6743\u9650\u662fmode\u4e0eumask\u7684\u8fdb\u884c\uff08mode&~umask\uff09\u8fd0\u7b97\u540e\u7684\u6765\u7684\u7ed3\u679c\u3002\u8fd9\u4e00\u70b9\u8fd8\u53ef\u4ee5\u53c2\u89c1\u8fd9\u91cc<\/a>\u7684\u6587\u7ae0\u3002<\/p>\n

4.creat\u51fd\u6570\u4e5f\u53ef\u4ee5\u6253\u5f00\u6216\u521b\u5efa\u4e00\u4e2a\u6587\u4ef6\u3002\u4e0eopen\u4e0d\u540c\u7684\u662f\uff0ccreat\u51fd\u6570\u65e2\u53ef\u4ee5\u6253\u5f00\u4e00\u4e2a\u5b58\u5728\u7684\u6587\u4ef6\uff0c\u53c8\u53ef\u4ee5\u6253\u5f00\u4e00\u4e2a\u4e0d\u5b58\u5728\u7684\u6587\u4ef6\u3002\u56e0\u6b64\u624dcreat\u51fd\u6570\u76f8\u5f53\u4e8e\u8fd9\u6837\u4f7f\u7528open\u51fd\u6570\uff1aopen(const char* pathname,(O_CREAT|O_TRUNC|O_WRONLY),mode_t mode)\u3002\u4e0d\u8fc7\u5e94\u8be5\u6ce8\u610f\u7684\uff0ccreat\u51fd\u6570\u53ea\u80fd\u4ee5\u53ea\u5199\u65b9\u5f0f\u6253\u5f00\u6216\u521b\u5efa\u4e00\u4e2a\u6587\u4ef6\u3002<\/p>\n

5.\u8bfb\u5199\u51fd\u6570\u4f7f\u7528\u8d77\u6765\u6bd4\u8f83\u7b80\u5355\uff0c\u6210\u529f\u8c03\u7528\u4f1a\u8fd4\u56de\u5b9e\u9645\u8bfb\uff08\u6216\u5199\uff09\u7684\u5b57\u8282\u6570\u3002\u4e00\u822c\u5728\u4f7f\u7528\u8fd9\u4e24\u4e2a\u51fd\u6570\u7684\u540c\u65f6\u4f1a\u7528if\u8bed\u53e5\u5bf9\u8fd4\u56de\u503c\u52a0\u4ee5\u5224\u65ad\uff0c\u4ee5\u786e\u5b9a\u8c03\u7528\u662f\u5426\u6b63\u5e38\u3002\u6bd4\u5982\u5177\u4f53\u4ee3\u7801\u53ef\u53c2\u8003\u5982\u4e0b\uff1a<\/p>\n

if((ret=read(fd,read_buf,len))<0)\r\n{\r\n     my_error(\"read\",__LINE__);\r\n}<\/pre>\n
\u8fd9\u91cc\u5e76\u6ca1\u6709\u4e25\u683c\u89c4\u5b9a\u8fd4\u56de\u503c\u5fc5\u987b\u7b49\u4e8e\u8bfb\uff08\u6216\u5199\uff09\u7684\u5b57\u8282\u6570\uff0c\u56e0\u4e3a\u6709\u53ef\u80fd\u5f53\u524d\u6587\u4ef6\u7684\u8bfb\u5199\u6307\u9488\u4e0e\u6587\u4ef6\u672b\u5c3e\u7684\u504f\u79fb\u91cf\u5c0f\u4e8e\u8981\u8bfb\uff08\u6216\u5199\uff09\u7684\u5b57\u8282\u6570\uff08\u901a\u4fd7\u7684\u8bf4\u5c31\u662f\u4e0d\u591f\u8bfb\u6216\u5199\uff09\uff0c\u8fd9\u79cd\u60c5\u51b5\u5728\u4e0d\u4e25\u683c\u8981\u6c42\u7684\u60c5\u51b5\u4e0b\u4e5f\u7b97\u6b63\u5e38\u8bfb\u53d6\u3002<\/p>\n
6.\u6211\u4eec\u5e76\u4e0d\u662f\u5e0c\u671b\u6bcf\u6b21\u90fd\u4ece\u6587\u4ef6\u5934\u5f00\u59cb\u8bfb\u6216\u5199\uff0c\u90a3\u4e48\u8fd9\u91cc\u5c31\u8981\u6d89\u53ca\u5230\u6587\u4ef6\u7684\u8bfb\u5199\u6307\u9488\u7684\u79fb\u52a8\u4e86\u3002lseek\u51fd\u6570\u7684\u4f5c\u7528\u662f\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e3afd\u7684\u6587\u4ef6\u4ecewhence\u5904\u5f00\u59cb\u79fb\u52a8offset\u4e2a\u5b57\u8282\u3002\u4e0d\u7ba1\u53c2\u6570\u5982\u4f55\u642d\u914d\uff0clseek\u6210\u529f\u8c03\u7528\u540e\uff0c\u90fd\u4f1a\u8fd4\u56de\u5f53\u524d\u7684\u8bfb\u5199\u4f4d\u7f6e\uff0c\u4e5f\u5c31\u662f\u8ddd\u79bb\u6587\u4ef6\u5f00\u5934\u7684\u5b57\u8282\u6570\u3002\u6839\u636e\u5404\u4e2a\u53c2\u6570\u7684\u542b\u4e49\uff0c\u5c31\u4f1a\u53c8\u4e0b\u9762\u7684\u51e0\u79cd\u5e38\u7528\u65b9\u6cd5\uff1a<\/p>\n
\u5c06\u6587\u4ef6\u8bfb\u5199\u6307\u9488\u79fb\u52a8\u5230\u6587\u4ef6\u5f00\u59cb\uff1alseek(fd,0,SEEK_SET);<\/p>\n
\u5c06\u6587\u4ef6\u8bfb\u5199\u6307\u9488\u79fb\u52a8\u5230\u6587\u4ef6\u7ed3\u5c3e\uff1alseek(fd,0,SEEK_END);<\/p>\n
\u83b7\u53d6\u6587\u4ef6\u8bfb\u5199\u6307\u9488\u5f53\u524d\u7684\u4f4d\u7f6e\uff1aret=lseek(fd,0,SEEK_CUR);<\/p>\n
lseek\u5141\u8bb8\u5c06\u6587\u4ef6\u6307\u9488\u8bbe\u7f6e\u5230\u6587\u4ef6\u7ed3\u675f\u7b26\u4e4b\u540e\uff0c\u4f46\u8fd9\u5e76\u4e0d\u6539\u53d8\u6587\u4ef6\u7684\u5927\u5c0f\u3002\u5982\u679c\u7ee7\u7eed\u5bf9EOF\u4e4b\u540e\u7684\u4f4d\u7f6e\u5199\u6570\u636e\uff0c\u90a3\u4e48\u4e4b\u524d\u7684EOF\u4e4b\u5904\u4e0e\u4e4b\u540e\u5199\u5165\u7684\u6570\u636e\u4e4b\u95f4\u5c06\u5b58\u5728\u4e00\u6bb5\u201c\u7a7a\u9699\u201d\u3002\u5982\u679c\u7528read\u8bfb\u53d6\u8fd9\u6bb5\u95f4\u9694\u7684\u6570\u636e\uff0c\u90a3\u4e48\u53ef\u4ee5\u53d1\u73b0\u6570\u636e\u4e3a0\uff0c\u5176\u5b9e\u8fd9\u6bb5\u7a7a\u9699\u4e2d\u586b\u5145\u7684\u662f’\\0’\u3002\u6bd4\u5982\u7528lseek\u51fd\u6570\u4ece\u6587\u4ef6\u672b\u5c3e\u79fb\u52a810\u4e2a\u5b57\u8282\uff0c\u518d\u7ee7\u7eed\u5199\u5165\u65b0\u6570\u636e\uff0c\u90a3\u4e48\u65e7\u6570\u636e\u548c\u65b0\u6570\u636e\u4e4b\u95f4\u5c06\u670910\u4e2a’\\0’\u3002<\/p>\n
\u6211\u4eec\u90fd\u77e5\u9053\u5b57\u7b26\u4e32\u5747\u4ee5’\\0’\u7ed3\u5c3e\uff0c\u6240\u4ee5\u6211\u4eec\u76f4\u63a5\u8f93\u51fa\u8bfb\u53d6\u6587\u4ef6\u7684\u90a3\u4e2a\u5b57\u7b26\u4e32\u662f\u4e0d\u884c\u7684\uff0c\u56e0\u4e3a\u5b83\u53ea\u4f1a\u8f93\u51fa\u7a7a\u9699\u524d\u7684\u6570\u636e\uff08\u65e7\u6570\u636e\uff09\u3002\u56e0\u6b64\u6211\u4eec\u5f97\u4e00\u4e2a\u5b57\u7b26\u4e00\u4e2a\u5b57\u7b26\u7684\u8f93\u51fa\uff0c\u8fd9\u6837\u624d\u80fd\u5c06\u65b0\u65e7\u6570\u636e\u90fd\u8f93\u51fa\u3002\u4f46\u8fd9\u6837\u4ecd\u7136\u4e0d\u80fd\u8f93\u51fa\u7a7a\u9699\u4e2d\u7684\u6570\u636e\uff0c\u4e0d\u8fc7\u7528od -c filename\u547d\u4ee4\u5c31\u53ef\u4ee5\u67e5\u770b\u6587\u4ef6\u4e2d\u7684\u6bcf\u4e00\u4e2a\u5b57\u7b26\uff0c\u5305\u62ec\u7a7a\u9699\u4e2d\u7684’\\0’\u3002<\/p>\n
7.\u521d\u6b21\u5b66\u4e60dup\u51fd\u6570\u53ef\u80fd\u4e0d\u80fd\u771f\u5b9e\u4f53\u4f1a\u5176\u7528\u9014\u3002\u4e0d\u8fc7\u6d89\u53ca\u5230\u8f93\u5165\u8f93\u51fa\u91cd\u5b9a\u4f4d\u65f6\uff0c\u5b83\u7684\u5a01\u529b\u5c31\u663e\u793a\u4e86\u51fa\u6765\u3002\u6bd4\u8f83\u7279\u522b\u7684\u662f\uff0cdup\u51fd\u6570\u6bcf\u6b21\u90fd\u8fd4\u56de\u7cfb\u7edf\u5185\u5c1a\u672a\u4f7f\u7528\u7684\u6700\u5c0f\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002\u5728\u524d\u9762\u6211\u4eec\u4e00\u8d77\u5206\u6790\u7ba1\u9053\u5e94\u7528\u7684\u65f6\u5019\uff0c\u6709\u4e00\u4e2a\u4e3b\u7a0b\u5e8f\u76d1\u63a7\u5b50\u7a0b\u5e8f\u7684\u4f8b\u5b50\u3002\u7531\u4e8e\u5b50\u7a0b\u5e8fexec\u540e\uff0c\u4ee5\u524d\u90a3\u4e9b\u6570\u636e\uff08\u6bd4\u5982\u7ba1\u9053\u7684\u63cf\u8ff0\u7b26\uff09\u5c06\u8361\u7136\u65e0\u5b58\uff0c\u6240\u4ee5\u6211\u4eec\u9700\u8981\u7528dup\u8fdb\u884c\u4e00\u4e9b\u91cd\u5b9a\u4f4d\u3002\u5177\u4f53\u6765\u770b\uff1a<\/p>\n
\tswitch(pid)\r\n\t{\r\n\t\tcase -1:\r\n\t\t\tperror(\"fork failed\");\r\n\t\t\texit(1);\r\n\t\tcase 0:\r\n\t\t\tclose(0);\r\n                        dup(fd[0]);\r\n\t\t\texecve(\"ctrlprocess\",(void*)argv,environ);\r\n\t\t\texit(0);\r\n\t\tdefault:\r\n\t\t\tclose(fd[0]);\r\n\t\t\twrite(fd[1],argv[1],strlen(argv[1]));\r\n\t\t\tbreak;\r\n\r\n\t}<\/pre>\n
\u53ef\u4ee5\u770b\u5230\u7236\u8fdb\u7a0b\u8d1f\u8d23\u5411\u7ba1\u9053\u5199\u6570\u636e\u3002\u800c\u5b50\u8fdb\u7a0b\u8131\u79bb\u7236\u8fdb\u7a0b\u524d\u5148\u5c06\u6807\u51c6\u8f93\u5165\u7aef\u5173\u95ed\uff0c\u7136\u540e\u518d\u5bf9\u7ba1\u9053\u7684\u8f93\u51fa\u7aefdup\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u63a5\u7740\u5c31\u53ef\u4ee5\u6267\u884c\u65b0\u7684\u7a0b\u5e8fctrlprocess\u4e86\u3002\u800c\u65b0\u7684\u5b50\u8fdb\u7a0b\u53ea\u9700\u5728\u6807\u51c6\u8f93\u5165\u7aef\u8bfb\u6570\u636e\u5c31\u53ef\u4ee5\u4e86\u3002<\/p>\n
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