{"id":3462,"date":"2011-10-27T17:50:07","date_gmt":"2011-10-27T09:50:07","guid":{"rendered":"http:\/\/edsionte.com\/techblog\/?p=3462"},"modified":"2012-03-13T23:43:46","modified_gmt":"2012-03-13T15:43:46","slug":"%e7%9b%ae%e5%bd%95%e6%93%8d%e4%bd%9capi%e5%ba%94%e7%94%a8%e4%b9%8bls%e5%91%bd%e4%bb%a4%e7%9a%84%e5%ae%9e%e7%8e%b0","status":"publish","type":"post","link":"http:\/\/edsionte.com\/techblog\/archives\/3462","title":{"rendered":"\u76ee\u5f55\u64cd\u4f5cAPI\u5e94\u7528\u4e4bls\u547d\u4ee4\u7684\u5b9e\u73b0"},"content":{"rendered":"<p>Linux\u7cfb\u7edf\u4e0b\u6709\u4e00\u7cfb\u5217\u5bf9\u76ee\u5f55\u64cd\u4f5c\u7684API\uff0c\u5982\u679c\u5355\u4e00\u7684\u53bb\u5b66\u4e60\u8fd9\u4e9bAPI\u90a3\u4e48\u5b66\u4e60\u8fc7\u7a0b\u65e0\u7591\u662f\u5355\u8c03\u7684\u3002\u672c\u6587\u4ee5\u5b9e\u73b0Linux\u4e0bls\u547d\u4ee4\u4e3a\u4f8b\uff0c\u7b80\u5355\u8bf4\u660e\u4e0e\u76ee\u5f55\u64cd\u4f5c\u76f8\u5173\u7684API\u3002<\/p>\n<h3>1.\u83b7\u53d6\u6587\u4ef6\u540d<\/h3>\n<p>\u83b7\u53d6\u4e00\u4e2a\u6307\u5b9a\u76ee\u5f55\u4e0b\u7684\u6587\u4ef6\u540d\u5217\u8868\u662fls\u547d\u4ee4\u6700\u57fa\u672c\u7684\u529f\u80fd\u3002\u5bf9\u4e8e\u4e00\u4e2a\u666e\u901a\u6587\u4ef6\u800c\u8a00\uff0c\u8bfb\u6587\u4ef6\u4e2d\u6570\u636e\u7684\u6b65\u9aa4\u662f\uff1aopen()\u6587\u4ef6\uff0cread()\u6587\u4ef6\uff0cclose()\u6587\u4ef6\u3002\u5bf9\u4e8e\u76ee\u5f55\u6587\u4ef6\u800c\u8a00\uff0c\u5b83\u5305\u542b\u7684\u5185\u5bb9\u5c31\u662f\u82e5\u5e72\u4e2a\u76ee\u5f55\u9879\uff0c\u4e00\u4e2a\u76ee\u5f55\u9879\u5373\u5bf9\u5e94\u8be5\u76ee\u5f55\u4e0b\u7684\u4e00\u4e2a\u6587\u4ef6\u3002\u56e0\u6b64\u8bfb\u76ee\u5f55\u7684\u8fc7\u7a0b\u4e0e\u666e\u901a\u6587\u4ef6\u7c7b\u4f3c\uff0c\u4e0d\u8fc7Linux\u4e0b\u7684\u76ee\u5f55\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u6587\u4ef6\uff0c\u56e0\u6b64\u6709\u4e00\u7ec4\u9488\u5bf9\u76ee\u5f55\u64cd\u4f5c\u7684API\uff0c\u5177\u4f53\u5982\u4e0b\uff1a<\/p>\n<pre class=\"brush:c\">       #include &lt; sys\/types.h &gt;\r\n       #include &lt; dirent.h &gt;\r\n\r\n       DIR *opendir(const char *name);\r\n       struct dirent *readdir(DIR *dirp);\r\n       int closedir(DIR *dirp);<\/pre>\n<p>\u8bfb\u76ee\u5f55\u4e4b\u524d\u5fc5\u987b\u7528opendir()\u6253\u5f00\u76ee\u5f55\uff0c\u5b83\u8fd4\u56de\u4e00\u4e2aDIR *\u7c7b\u578b\u7684\u76ee\u5f55\u6d41\uff0c\u5b83\u7c7b\u4f3c\u4e8e\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002\u63a5\u7740\u4f7f\u7528readdir()\u8bfb\u53d6\u8be5\u76ee\u5f55\u6d41\u4e2d\u7684\u76ee\u5f55\u9879\uff0c\u8be5\u51fd\u6570\u6bcf\u6210\u529f\u8c03\u7528\u4e00\u6b21\u5219\u8fd4\u56de\u4e00\u4e2astruct dirent\u7c7b\u578b\u7684\u76ee\u5f55\u9879\u3002\u5f53\u6253\u5f00\u67d0\u4e2a\u76ee\u5f55\u540e\uff0c\u7b2c\u4e00\u6b21\u8c03\u7528\u8be5\u51fd\u6570\u5219\u8fd4\u56de\u5f53\u524d\u76ee\u5f55\u4e0b\u7b2c\u4e00\u4e2a\u6587\u4ef6\u7684\u4fe1\u606f\uff0c\u7b2c\u4e8c\u6b21\u8c03\u7528\u5219\u8fd4\u56de\u7b2c\u4e8c\u4e2a\u6587\u4ef6\u7684\u4fe1\u606f\uff0c\u4ee5\u6b64\u7c7b\u63a8\u3002\u5f53\u8bfb\u5b8c\u8be5\u76ee\u5f55\u4e0b\u7684\u6240\u6709\u6587\u4ef6\u540e\u8fd4\u56deNULL\u3002\u7531\u6b64\u53ef\u89c1\uff0c\u8981\u8bfb\u53d6\u6307\u5b9a\u76ee\u5f55\u4e0b\u7684\u6240\u6709\u76ee\u5f55\u9879\uff0c\u5219\u9700\u8981\u4e00\u4e2a\u5faa\u73af\u7684\u8fc7\u7a0b\u3002\u63cf\u8ff0\u76ee\u5f55\u9879\u7684\u7ed3\u6784\u4f53dirent\u63cf\u8ff0\u5982\u4e0b\uff1a<\/p>\n<pre class=\"brush:c\">          struct dirent {\r\n               ino_t          d_ino;       \/* inode number *\/\r\n               off_t          d_off;       \/* offset to the next dirent *\/\r\n               unsigned short d_reclen;    \/* length of this record *\/\r\n               unsigned char  d_type;      \/* type of file; not supported\r\n                                              by all file system types *\/\r\n               char           d_name[256]; \/* filename *\/\r\n           };<\/pre>\n<p>\u76ee\u5f55\u9879\u4e0e\u76ee\u5f55\u662f\u4e24\u4e2a\u5b8c\u5168\u4e0d\u540c\u7684\u6982\u5ff5\u3002\u6bd4\u5982\u5728\/home\/edsionte\/test\/\u4e0b\u6709\u4e00\u4e2a\u76ee\u5f55\u6587\u4ef6mydir\u548c\u4e00\u4e2a\u6587\u672c\u6587\u4ef6mytxt.txt\uff0c\u90a3\u4e48\u8be5\u76ee\u5f55\u4e0b\u5c31\u5305\u542b\u4e24\u4e2a\u76ee\u5f55\u9879\uff0c\u5206\u522b\u63cf\u8ff0mydir\u548cmytxt.txt\u3002\u4f46\u662f\u901a\u8fc7\u8fd9\u4e24\u4e2a\u76ee\u5f55\u9879\u5e76\u4e0d\u80fd\u76f4\u63a5\u5c31\u8bbf\u95ee\u5230\u5bf9\u5e94\u6587\u4ef6\uff0c\u56e0\u4e3a\u76ee\u5f55\u9879\u53ea\u7528\u4e8e\u63cf\u8ff0\u5f53\u524d\u76ee\u5f55\u4e0b\u7684\u6587\u4ef6\u540d\u7b49\u4fe1\u606f\u3002\u5982\u679c\u8981\u8bbf\u95ee\u8fd9\u4e24\u4e2a\u6587\u4ef6\uff0c\u8fd8\u5fc5\u987b\u83b7\u5f97\/\u3001home\/\u3001edsionte\/\u548ctest\/\u8fd9\u51e0\u4e2a\u76ee\u5f55\u9879\u3002\u7531\u6b64\u53ef\u89c1\uff0c\u76ee\u5f55\u9879\u662f\u7528\u6765\u65b9\u4fbf\u641c\u7d22\u6587\u4ef6\u7684\u7ed3\u6784\u3002<\/p>\n<p>\u5f53\u4e0d\u518d\u4f7f\u7528\u67d0\u4e2a\u5df2\u6253\u5f00\u7684\u76ee\u5f55\u65f6\uff0c\u4f7f\u7528closedir()\u5173\u95ed\u8be5\u76ee\u5f55\u3002\u901a\u8fc7\u4e0a\u8ff0\u4e09\u4e2aAPI\u5c31\u53ef\u4ee5\u5b9e\u73b0\u83b7\u53d6\u6307\u5b9a\u76ee\u5f55\u4e0b\u6587\u4ef6\u540d\u7684\u529f\u80fd\u3002\u4f2a\u4ee3\u7801\u5b9e\u73b0\u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre class=\"brush:c\">int get_file_name(char *path)\r\n{\r\n\tDIR *mydir;\r\n\tstruct dirent *myentry;\r\n\r\n\tif ((mydir = opendir(path)) == NULL) {\r\n\t\tdo_error();\r\n\t}\r\n\r\n\twhile ((myentry = readdir(mydir)) != NULL) {\r\n\t\tprintf(\"%s\\t\", myentry-&gt;d_name);\r\n\t}\r\n\tprintf(\"\\n\");\r\n\tclosedir(mydir);\r\n\r\n\treturn 0;\r\n}<\/pre>\n<p>\u6309\u7167\u8fd9\u79cd\u65b9\u5f0f\u5b9e\u73b0\u7684ls\u547d\u4ee4\u53ea\u80fd\u663e\u793apath\u76ee\u5f55\u4e0b\u7684\u6587\u4ef6\u540d\u79f0\uff0c\u4ec5\u6b64\u800c\u5df2\u3002<\/p>\n<h3>2.\u83b7\u53d6\u6587\u4ef6\u5217\u8868<\/h3>\n<p>\u83b7\u53d6\u6307\u5b9a\u76ee\u5f55\u4e0b\u6587\u4ef6\u540d\u5bf9\u4e8els\u547d\u4ee4\u6765\u8bf4\u8fd8\u8fdc\u8fdc\u4e0d\u591f\uff0c\u6211\u4eec\u9700\u8981\u83b7\u53d6\u6bcf\u4e2a\u6587\u4ef6\u540d\u7684\u5c5e\u6027\u4fe1\u606f\uff0c\u4e5f\u5c31\u662f\u5b9e\u73b0\u7c7b\u4f3cls -l\u7684\u529f\u80fd\u3002\u8981\u5b9e\u73b0\u8be5\u529f\u80fd\u5c31\u5fc5\u987b\u4f7f\u7528stat\u65cf\u51fd\u6570\uff0c\u8be5\u51fd\u6570\u4f1a\u5c06\u6587\u4ef6\u7684\u4fe1\u606f\u8fd4\u56de\u5230\u4f20\u5165\u7684\u53c2\u6570buf\u4e2d\uff0cbuf\u662fstruct stat\u7c7b\u578b\u3002<\/p>\n<pre class=\"brush:c\">       #include &lt; sys\/types.h &gt;\r\n       #include &lt; sys\/stat.h &gt;\r\n       #include &lt; unistd.h &gt;\r\n\r\n       int stat(const char *path, struct stat *buf);\r\n       int fstat(int fd, struct stat *buf);\r\n       int lstat(const char *path, struct stat *buf);\r\n\r\n          struct stat {\r\n               dev_t     st_dev;     \/* ID of device containing file *\/\r\n               ino_t     st_ino;     \/* inode number *\/\r\n               mode_t    st_mode;    \/* protection *\/\r\n               nlink_t   st_nlink;   \/* number of hard links *\/\r\n               uid_t     st_uid;     \/* user ID of owner *\/\r\n               gid_t     st_gid;     \/* group ID of owner *\/\r\n               dev_t     st_rdev;    \/* device ID (if special file) *\/\r\n               off_t     st_size;    \/* total size, in bytes *\/\r\n               blksize_t st_blksize; \/* blocksize for file system I\/O *\/\r\n               blkcnt_t  st_blocks;  \/* number of 512B blocks allocated *\/\r\n               time_t    st_atime;   \/* time of last access *\/\r\n               time_t    st_mtime;   \/* time of last modification *\/\r\n               time_t    st_ctime;   \/* time of last status change *\/\r\n           };<\/pre>\n<p>\u5f97\u5230\u4e86\u6bcf\u4e2a\u6587\u4ef6\u7684stat\u7ed3\u6784\uff0c\u5c31\u53ef\u4ee5\u6309\u7167\u9700\u6c42\u663e\u793a\u6587\u4ef6\u7684\u5c5e\u6027\u4fe1\u606f\u3002\u5bf9\u4e8estat\u65cf\u51fd\u6570\uff0c\u4e0d\u7ba1\u4f7f\u7528\u54ea\u4e00\u4e2a\u90fd\u5fc5\u987b\u83b7\u5f97\u6587\u4ef6\u7684\u7edd\u5bf9\u8def\u5f84\u3002\u5728\u672c\u6587\u7b2c\u4e00\u90e8\u5206\u4e2d\u901a\u8fc7\u8bfb\u53d6\u6307\u5b9a\u76ee\u5f55\u4e0b\u7684\u76ee\u5f55\u9879\uff0c\u53ea\u80fd\u901a\u8fc7d_name\u5b57\u6bb5\u83b7\u5f97\u76ee\u5f55\u9879\u540d\u5b57\uff0c\u56e0\u6b64\u4f7f\u7528stat\u51fd\u6570\u4e4b\u524d\u5fc5\u987b\u5408\u6210\u6bcf\u4e2a\u6587\u4ef6\u7684\u7edd\u5bf9\u8def\u5f84\u3002\u83b7\u53d6\u6587\u4ef6\u5217\u8868\u7684\u5b9e\u73b0\u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre class=\"brush:c\">int get_file_name(char *path)\r\n{\r\n\tDIR *mydir;\r\n\tstruct dirent *myentry;\r\n\r\n\tif ((mydir = opendir(dirpath)) == NULL) {\r\n\t\tdo_error();\r\n\t}\r\n\r\n\twhile ((myentry = readdir(mydir)) != NULL) {\r\n\t\tprintf(\"%s\\t\", myentry-&gt;d_name);\r\n\t\tstrcat(tmpbuf, dirpath);\r\n\t\tstrcat(tmpbuf, myentry-&gt;d_name);\r\n\t\tstruct stat myfstat;\r\n\t\tif (stat(tmpbuf, &amp;myfstat) == -1) {\r\n\t\t\tdo_error();\r\n\t\t}\r\n\t\tprint_file_stat(myfstat);\r\n\t\tprintf(\"\\n\");\r\n\t\tmemset(tmpbuf, len);\r\n\t}\r\n\tclosedir(mydir);\r\n\r\n\treturn 0;\r\n}<\/pre>\n<p>\u5176\u4e2d\uff0cprint_file_stat\u51fd\u6570\u53ef\u4ee5\u6309\u7167\u4f60\u7684\u5177\u4f53\u9700\u6c42\u663e\u793a\u5f53\u524d\u6587\u4ef6\u7684\u5404\u79cd\u5c5e\u6027\uff0c\u6bd4\u5982\u5173\u4e8e\u6587\u4ef6\u7684\u5404\u79cd\u65f6\u95f4\uff0c\u6587\u4ef6\u5927\u5c0f\u7b49\u3002\u672c\u8d28\u4e0a\u5c31\u662f\u5c06dirent\u7ed3\u6784\u4e2d\u7684\u76f8\u5173\u5b57\u6bb5\u6253\u5370\u3002<\/p>\n<h3>3. 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class=\"brush:c\">       \r\n       #include < unistd.h >\r\n       int chdir(const char *path);<\/pre>\n<p>chdir()\u7528\u4e8e\u5c06\u5f53\u524d\u5de5\u4f5c\u76ee\u5f55\u5207\u6362\u5230path\u6307\u5b9a\u7684\u76ee\u5f55\uff0c\u5982\u679c\u5207\u6362\u6210\u529f\u5219\u8fd4\u56de0\uff0c\u5426\u5219\u8fd4\u56de-1\u3002\u636e\u6b64\uff0c\u4fee\u6539\u540e\u7684ls\u547d\u4ee4\u5b9e\u73b0\u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre class=\"brush:c\">int get_file_name(char *path)\r\n{\r\n\tDIR *mydir;\r\n\tstruct dirent *myentry;\r\n\r\n\tif ((mydir = opendir(dirpath)) == NULL) {\r\n\t\tdo_error();\r\n\t}\r\n\r\n\twhile ((myentry = readdir(mydir)) != NULL) {\r\n\t\tprintf(\"%s\\t\", myentry-&gt;d_name);\r\n\t\tstrcat(tmpbuf, dirpath);\r\n\t\tstrcat(tmpbuf, myentry-&gt;d_name);\r\n\t\tstruct stat myfstat;\r\n\t\tif (stat(tmpbuf, &amp;myfstat) == -1) {\r\n\t\t\tdo_error();\r\n\t\t}\r\n\t\tprint_file_stat(myfstat);\r\n\r\n\t\tif (chdir(tmpbuf) == -1) {\r\n\t\t\tprint_no_chdir();\r\n\t\t} else {\r\n\t\t\tprint_chdir();\r\n\t\t}\r\n\t\tprintf(\"\\n\");\r\n\t\tmemset(tmpbuf, len);\r\n\t}\r\n\tclosedir(mydir);\r\n\r\n\treturn 0;\r\n}<\/pre>\n<p>\u5982\u679c\u5207\u6362\u6210\u529f\uff0c\u901a\u8fc7print_no_chdir()\u6253\u5370\u53ef\u5207\u6362\u6807\u5fd7\uff0c\u5426\u5219\u6253\u5370\u4e0d\u53ef\u5207\u6362\u6807\u5fd7\u3002\u4e0a\u8ff0\u7684ls\u5b9e\u73b0\u65b9\u5f0f\u53ea\u662f\u57fa\u672c\u6a21\u578b\uff0c\u611f\u5174\u8da3\u7684\u7ae5\u978b\u53ef\u4ee5\u5728\u6b64\u57fa\u7840\u4e0a\u52a0\u4ee5\u6539\u8fdb\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Linux\u7cfb\u7edf\u4e0b\u6709\u4e00\u7cfb\u5217\u5bf9\u76ee\u5f55\u64cd\u4f5c\u7684API\uff0c\u5982\u679c\u5355\u4e00\u7684\u53bb\u5b66\u4e60\u8fd9\u4e9bAPI\u90a3\u4e48\u5b66\u4e60\u8fc7\u7a0b\u65e0\u7591\u662f\u5355\u8c03\u7684\u3002\u672c\u6587\u4ee5\u5b9e\u73b0Li [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[272,273,271],"class_list":["post-3462","post","type-post","status-publish","format-standard","hentry","category-linuxc","tag-272","tag-273","tag-271"],"views":6767,"_links":{"self":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts\/3462","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/comments?post=3462"}],"version-history":[{"count":0,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts\/3462\/revisions"}],"wp:attachment":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/media?parent=3462"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/categories?post=3462"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/tags?post=3462"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}