{"id":419,"date":"2016-08-25T13:40:47","date_gmt":"2016-08-25T05:40:47","guid":{"rendered":"http:\/\/www.5x44.cn\/?p=419"},"modified":"2016-12-01T15:27:19","modified_gmt":"2016-12-01T07:27:19","slug":"exec%e5%87%bd%e6%95%b0","status":"publish","type":"post","link":"https:\/\/www.5x44.cn\/?p=419","title":{"rendered":"exec\u51fd\u6570"},"content":{"rendered":"<p>\u5f53\u4e00\u4e2a\u8fdb\u7a0b\u8c03\u7528\u67d0\u4e2a<span style=\"color: #993300;\">exec<\/span>\u51fd\u6570\uff08execl, execlp, execle, execv, execvp, execve\uff09\u65f6\uff0c\u8fdb\u7a0b\u4f1a\u88ab\u65b0\u7a0b\u5e8f\u5b8c\u5168\u66ff\u6362\uff0c\u7136\u540e\u65b0\u7a0b\u5e8f\u5f00\u59cb\u5728\u5b83\u7684<span style=\"color: #993300;\">main<\/span>\u51fd\u6570\u5904\u6267\u884c\u3002PID\u5e76\u4e0d\u4f1a\u6539\u53d8\uff0c\u56e0\u4e3a\u65b0\u8fdb\u7a0b\u4e0d\u662f\u88ab\u521b\u5efa\u51fa\u6765\u7684\uff1b<span style=\"color: #993300;\">exec<\/span>\u53ea\u662f\u7528\u65b0\u7a0b\u5e8f\u7684\u6587\u672c\u6bb5\u3001\u6570\u636e\u6bb5\u3001\u5806\u548c\u6808\u6bb5\u66ff\u6362\u5f53\u524d\u7684\u8fdb\u7a0b\u3002<\/p>\n<table class=\"allBorders\" border=\"1\" rules=\"none\" cellspacing=\"0\" cellpadding=\"5\">\n<tbody>\n<tr>\n<td class=\"docTableCell\" align=\"left\" valign=\"top\">\n<pre><span style=\"color: #993300;\">#include &lt;unistd.h&gt;\r\n\r\nint execl(const char *<span class=\"docEmphItalicAlt\">pathname<\/span>, const char *<span class=\"docEmphItalicAlt\">arg0<\/span>, \r\n... \/* (char *)0 *\/ );\r\n\r\nint execv(const char *<span class=\"docEmphItalicAlt\">pathname<\/span>, char *const <span class=\"docEmphItalicAlt\">argv<\/span> []);\r\n\r\nint execle(const char *<span class=\"docEmphItalicAlt\">pathname<\/span>, const char *<span class=\"docEmphItalicAlt\">arg0<\/span>, ...\r\n           \/* (char *)0,  char *const <span class=\"docEmphItalicAlt\">envp<\/span>[] *\/ );\r\n\r\nint execve(const char *<span class=\"docEmphItalicAlt\">pathname<\/span>, char *const\r\n <span class=\"docEmphItalicAlt\">argv<\/span>[], char *const <span class=\"docEmphItalicAlt\">envp<\/span> []);\r\n\r\nint execlp(const char *<span class=\"docEmphItalicAlt\">filename<\/span>, const char *<span class=\"docEmphItalicAlt\">arg0<\/span>,\r\n... \/* (char *)0 *\/ );\r\n\r\nint execvp(const char *<span class=\"docEmphItalicAlt\">filename<\/span>, char *const <span class=\"docEmphItalicAlt\">argv<\/span> []);<\/span><\/pre>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"docTableCell\" align=\"right\" valign=\"top\">\n<p class=\"docText\">All six return: 1 on error, no return on success<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u524d\u9762\u56db\u4e2a\u51fd\u6570\u4f7f\u7528<em>\u8def\u5f84\u540d<\/em>\u505a\u53c2\u6570\uff0c\u800c\u6700\u540e\u4e24\u4e2a\u4f7f\u7528<em>\u6587\u4ef6\u540d<\/em>\u3002\u5f53\u4f7f\u7528<em>\u6587\u4ef6\u540d<\/em>\u65f6\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\u5982\u679c<em>\u6587\u4ef6\u540d<\/em>\u4e2d\u5305\u542b\u659c\u7ebf\u201c\/\u201d\uff0c\u90a3\u5b83\u662f\u4e00\u4e2a<em>\u8def\u5f84\u540d<\/em>\u3002<\/li>\n<li>\u53e6\u5916\uff0c\u53ef\u6267\u884c\u6587\u4ef6\u7684\u641c\u7d22\u8def\u5f84\u7531<span style=\"color: #993300;\">PATH<\/span>\u73af\u5883\u53d8\u91cf\u6307\u5b9a\u3002<\/li>\n<\/ul>\n<p><span style=\"color: #993300;\">PATH<\/span>\u53d8\u91cf\u5305\u542b\u4e00\u4e2a\u76ee\u5f55\u5217\u8868\uff0c\u88ab\u79f0\u4f5c\u505a\u8def\u5f84\u524d\u7f00\uff0c\u6bcf\u4e2a\u76ee\u5f55\u95f4\u7528\u5192\u53f7\u5206\u9694\u3002\u4f8b\u5982\uff1a<em>name=value<\/em>\u73af\u5883\u53d8\u91cf\u5b57\u7b26\u4e32<\/p>\n<p><span style=\"color: #993300;\">PATH=\/bin:\/usr\/bin:\/usr\/local\/bin\/:.<\/span><\/p>\n<p>\u6307\u5b9a\u4e864\u4e2a\u76ee\u5f55\uff0c\u6700\u540e\u4e00\u4e2a\u6307\u5b9a\u5f53\u524d\u76ee\u5f55\uff08\u4e00\u4e2a\u96f6\u957f\u5ea6\u524d\u7f00\u4e5f\u610f\u5473\u7740\u5f53\u524d\u76ee\u5f55\uff0c\u8fd9\u4e2a\u503c\u53ef\u4ee5\u7531\u4e00\u4e2a\u5192\u53f7\u5728value\u7684\u6700\u5f00\u59cb\u3001\u4e00\u884c\u4e2d\u4e24\u4e2a\u5192\u53f7\u6216\u8005\u5728value\u7684\u6700\u540e\u4e00\u4e2a\u5192\u53f7\u6307\u5b9a\u3002\uff09\u3002<\/p>\n<p>\u5982\u679c<span style=\"color: #993300;\">execlp<\/span>\u6216<span style=\"color: #993300;\">execvp<\/span>\u5728\u8def\u5f84\u524d\u7f00\u7684\u76ee\u5f55\u4e2d\u627e\u4e00\u4e2a\u53ef\u6267\u884c\u6587\u4ef6\uff0c\u4f46\u662f\u8fd9\u4e2a\u6587\u4ef6\u88ab\u8fde\u63a5\u5668\u53d1\u73b0\u5b83\u4e0d\u662f\u53ef\u6267\u884c\u7684\uff08isn&#8217;t a machine executable that was generated by the link editor\uff09\uff0c\u90a3\u4e48\u51fd\u6570\u5047\u5b9a\u8fd9\u4e2a\u6587\u4ef6\u662f\u4e00\u4e2ashell\u811a\u672c\uff0c\u5e76\u5c1d\u8bd5\u4f7f\u7528<span style=\"color: #993300;\">\/bin\/sh<\/span>\u6253\u5f00\u8be5\u6587\u4ef6\u3002<\/p>\n<p>\u53e6\u4e00\u4e2a\u4e0d\u540c\uff1a\u662f\u4f20\u8f93\u7684\u53c2\u6570\u5217\u8868\uff08<span style=\"color: #993300;\">l<\/span>\u4ee3\u8868list\uff0c<span style=\"color: #993300;\">v<\/span>\u4ee3\u8868vector\uff09\u3002<span style=\"color: #993300;\">execl<\/span>, <span style=\"color: #993300;\">execlp<\/span>\u548c<span style=\"color: #993300;\">execle<\/span>\u51fd\u6570\u5b83\u4eec\u4e3a\u65b0\u7a0b\u5e8f\u6307\u5b9a\u7684\u6bcf\u4e00\u4e2a\u547d\u4ee4\u884c\u53c2\u6570\u90fd\u662f\u5206\u5f00\u7684\u53c2\u6570\uff0c\u547d\u4ee4\u884c\u53c2\u6570\u7ed3\u5c3e\u4ee5null\u6307\u9488\u7ed3\u5c3e\u3002\u5bf9\u4e8e<span style=\"color: #993300;\">execv<\/span>, <span style=\"color: #993300;\">execvp<\/span>\u548c<span style=\"color: #993300;\">execve<span style=\"color: #000000;\">\u4f20\u9012\u7ed9\u65b0\u7a0b\u5e8f<\/span><\/span>\u7684\u53c2\u6570\u90fd\u5b58\u50a8\u5728\u4e00\u4e2a\u6307\u9488\u6570\u7ec4\uff08array of pointer\uff09\u4e2d\u3002<\/p>\n<p>\u4e0b\u9762\u662f<span style=\"color: #993300;\">execl, execlp\u548cexecle<\/span>\u7684\u53c2\u6570\u5217\u8868\u5b9e\u4f8b\uff1a<\/p>\n<table border=\"0\" width=\"100%\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td valign=\"top\">\n<pre><span style=\"color: #993300;\">char *<span class=\"docEmphItalicAlt\">arg0<\/span>, char *<span class=\"docEmphItalicAlt\">arg1<\/span>, ..., char *<span class=\"docEmphItalicAlt\">argn<\/span>, (char *)0\r\n<\/span><\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u6700\u540e\u7684\u7a7a\u6307\u9488\u5982\u679c\u8981\u7528\u5e38\u91cf<span style=\"color: #993300;\">0<\/span>\u7684\u8bdd\uff0c\u5fc5\u987b\u8fdb\u884c\u663e\u793a\u7684\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\uff0c\u5982\u679c\u4e0d\u8fd9\u4e48\u505a\uff0c\u5b83\u4f1a\u88ab\u89e3\u91ca\u6210\u6574\u578b\uff0c\u5982\u679c\u7cfb\u7edf\u4e2d\u7684\u6574\u578b\u548cchar*\u7684\u5927\u5c0f\u4e0d\u4e00\u6837\uff0c\u90a3\u4e48<span style=\"color: #993300;\">exe<\/span>c\u51fd\u6570\u6536\u5230\u8fd9\u4e2a\u53c2\u6570\u4f1a\u51fa\u9519\u3002<\/p>\n<p>\u6700\u540e\u4e00\u4e2a\u4e0d\u540c\uff1a\u4f20\u9001\u73af\u5883\u53d8\u91cf\u5217\u8868\u5230\u65b0\u7a0b\u5e8f\u4e2d\u3002\u4e24\u4e2a\u7ed3\u5c3e\u4ee3<span style=\"color: #993300;\">e<\/span>\u7684\u51fd\u6570\uff08<span style=\"color: #993300;\">execle, execve<\/span>\uff09\u5141\u8bb8\u6211\u4eec\u4f20\u9001\u4e00\u4e2a\u542b\u6709\u73af\u5883\u5b57\u7b26\u4e32\u7684\u6307\u9488\u6570\u7ec4\uff08array of pointer\uff09\u7ed9\u65b0\u7a0b\u5e8f\u3002\u5176\u5b83\u56db\u4e2a\u51fd\u6570\u5728\u8c03\u7528\u8fdb\u7a0b\u4e2d\u4f7f\u7528<span style=\"color: #993300;\">environ<\/span>\u53d8\u91cf\u590d\u5236\u5f53\u524d\u73af\u5883\u53d8\u91cf\u7ed9\u65b0\u7a0b\u5e8f\u3002\uff08\u5982\u679c\u7cfb\u7edf\u652f\u6301<span style=\"color: #993300;\">setenv<\/span>\u548c<span style=\"color: #993300;\">putenv<\/span>\uff0c\u90a3\u6211\u4eec\u53ef\u4ee5\u6539\u53d8\u5f53\u524d\u7684\u73af\u5883\u53d8\u91cf\u548c\u5b50\u8fdb\u7a0b\u7684\u73af\u5883\u53d8\u91cf\uff0c\u4f46\u662f\u4e0d\u80fd\u6539\u53d8\u7236\u8fdb\u7a0b\u7684\uff09\u4e00\u822c\u4e00\u4e2a\u8fdb\u7a0b\u7684\u73af\u5883\u53d8\u91cf\u4f1a\u4f20\u7ed9\u4ed6\u7684\u5b50\u8fdb\u7a0b\uff0c\u4f46\u662f\u5728\u4e00\u4e9b\u6848\u4f8b\u4e2d\uff0c\u8fdb\u7a0b\u60f3\u4e3a\u5b50\u8fdb\u7a0b\u6307\u5b9a\u67d0\u4e9b\u73af\u5883\u53d8\u91cf\u3002<\/p>\n<p>\u516d\u4e2aexec\u51fd\u6570\u4e0d\u65b9\u4fbf\u8bb0\u5fc6\u3002\u901a\u8fc7\u51e0\u4e2a\u5b57\u6bcd\u6765\u533a\u5206\u5b83\u4eec\u7684\u7528\u5904\uff1a<\/p>\n<p>\u5b57\u6bcd<span style=\"color: #993300;\">p<\/span>\uff1a\u610f\u5473\u7740\u51fd\u6570\u4f7f\u7528<em>filename<\/em>\u53c2\u6570\u5e76\u4f7f\u7528<span style=\"color: #993300;\">PATH<\/span>\u73af\u5883\u53d8\u91cf\u67e5\u627e\u53ef\u6267\u884c\u6587\u4ef6\u3002<\/p>\n<p>\u5b57\u6bcd<span style=\"color: #993300;\">l<\/span>\uff1a\u610f\u5473\u7740\u4f7f\u7528\u53c2\u6570\u5217\u8868\uff0c\u5b83\u548c\u5b57\u6bcdv\u662f\u4e92\u65a5\u7684\u3002<\/p>\n<p>\u5b57\u6bcd<span style=\"color: #993300;\">v<\/span>\uff1a\u610f\u5473\u7740\u53c2\u6570\u5217\u8868\u4f7f\u7528\u6570\u7ec4\u5411\u91cf\u3002<\/p>\n<p>\u5b57\u6bcd<span style=\"color: #993300;\">e<\/span>\uff1a\u610f\u5473\u7740\u4f7f\u7528\u6570\u7ec4\u5411\u91cf\u4ee3\u66ff\u4f7f\u7528\u5f53\u524d\u73af\u5883\u53d8\u91cf\u3002<\/p>\n<table class=\"allBorders\" border=\"1\" rules=\"groups\" cellspacing=\"0\" cellpadding=\"5\">\n<thead>\n<tr>\n<th class=\"rightBorder bottomBorder thead\" scope=\"col\" align=\"center\" valign=\"top\">\n<p class=\"docText\"><span class=\"docEmphRoman\">Function<\/span><\/p>\n<\/th>\n<th class=\"rightBorder bottomBorder thead\" scope=\"col\" align=\"center\" valign=\"top\">\n<p class=\"docText\"><span class=\"docEmphRoman\"><span class=\"docEmphasis\">pathname<\/span><\/span><\/p>\n<\/th>\n<th class=\"rightBorder bottomBorder thead\" scope=\"col\" align=\"center\" valign=\"top\">\n<p class=\"docText\"><span class=\"docEmphRoman\"><span class=\"docEmphasis\">filename<\/span><\/span><\/p>\n<\/th>\n<th class=\"rightBorder bottomBorder thead\" scope=\"col\" align=\"center\" valign=\"top\">\n<p class=\"docText\"><span class=\"docEmphRoman\">Arg list<\/span><\/p>\n<\/th>\n<th class=\"rightBorder bottomBorder thead\" scope=\"col\" align=\"center\" valign=\"top\">\n<p class=\"docText\"><span class=\"docEmphRoman\"><span class=\"docEmphasis\">argv<\/span>[]<\/span><\/p>\n<\/th>\n<th class=\"rightBorder bottomBorder thead\" scope=\"col\" align=\"center\" valign=\"top\">\n<p class=\"docText\"><span class=\"docEmphRoman\"><tt>environ<\/tt><\/span><\/p>\n<\/th>\n<th class=\"bottomBorder thead\" scope=\"col\" align=\"center\" valign=\"top\">\n<p class=\"docText\"><span class=\"docEmphRoman\"><span class=\"docEmphasis\">envp<\/span>[]<\/span><\/p>\n<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"rightBorder\" align=\"left\" valign=\"top\">\n<p class=\"docText\"><tt>execl<\/tt><\/p>\n<\/td>\n<td class=\"rightBorder\" align=\"center\" valign=\"top\">\n<p class=\"docText\">\u2022<\/p>\n<\/td>\n<td class=\"rightBorder\" align=\"left\" valign=\"top\"><\/td>\n<td class=\"rightBorder\" align=\"center\" valign=\"top\">\n<p class=\"docText\">\u2022<\/p>\n<\/td>\n<td class=\"rightBorder\" align=\"left\" valign=\"top\"><\/td>\n<td class=\"rightBorder\" align=\"center\" valign=\"top\">\n<p class=\"docText\">\u2022<\/p>\n<\/td>\n<td class=\"docTableCell\" align=\"left\" valign=\"top\"><\/td>\n<\/tr>\n<tr>\n<td class=\"rightBorder\" align=\"left\" valign=\"top\">\n<p class=\"docText\"><tt>execlp<\/tt><\/p>\n<\/td>\n<td class=\"rightBorder\" align=\"left\" valign=\"top\"><\/td>\n<td class=\"rightBorder\" align=\"center\" valign=\"top\">\n<p class=\"docText\">\u2022<\/p>\n<\/td>\n<td class=\"rightBorder\" align=\"center\" valign=\"top\">\n<p class=\"docText\">\u2022<\/p>\n<\/td>\n<td class=\"rightBorder\" align=\"left\" valign=\"top\"><\/td>\n<td class=\"rightBorder\" align=\"center\" valign=\"top\">\n<p class=\"docText\">\u2022<\/p>\n<\/td>\n<td class=\"docTableCell\" align=\"left\" valign=\"top\"><\/td>\n<\/tr>\n<tr>\n<td class=\"rightBorder\" align=\"left\" valign=\"top\">\n<p class=\"docText\"><tt>execle<\/tt><\/p>\n<\/td>\n<td class=\"rightBorder\" align=\"center\" valign=\"top\">\n<p class=\"docText\">\u2022<\/p>\n<\/td>\n<td class=\"rightBorder\" align=\"left\" valign=\"top\"><\/td>\n<td class=\"rightBorder\" align=\"center\" valign=\"top\">\n<p class=\"docText\">\u2022<\/p>\n<\/td>\n<td class=\"rightBorder\" align=\"left\" valign=\"top\"><\/td>\n<td class=\"rightBorder\" align=\"left\" valign=\"top\"><\/td>\n<td class=\"docTableCell\" align=\"center\" valign=\"top\">\n<p class=\"docText\">\u2022<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"rightBorder\" align=\"left\" valign=\"top\">\n<p class=\"docText\"><tt>execv<\/tt><\/p>\n<\/td>\n<td class=\"rightBorder\" align=\"center\" valign=\"top\">\n<p class=\"docText\">\u2022<\/p>\n<\/td>\n<td class=\"rightBorder\" align=\"left\" valign=\"top\"><\/td>\n<td class=\"rightBorder\" align=\"left\" valign=\"top\"><\/td>\n<td class=\"rightBorder\" align=\"center\" valign=\"top\">\n<p class=\"docText\">\u2022<\/p>\n<\/td>\n<td class=\"rightBorder\" align=\"center\" valign=\"top\">\n<p class=\"docText\">\u2022<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"rightBorder\" align=\"left\" valign=\"top\">\n<p class=\"docText\"><tt>execvp<\/tt><\/p>\n<\/td>\n<td class=\"rightBorder\" align=\"left\" valign=\"top\"><\/td>\n<td class=\"rightBorder\" align=\"center\" valign=\"top\">\n<p class=\"docText\">\u2022<\/p>\n<\/td>\n<td class=\"rightBorder\" align=\"left\" valign=\"top\"><\/td>\n<td class=\"rightBorder\" align=\"center\" valign=\"top\">\n<p class=\"docText\">\u2022<\/p>\n<\/td>\n<td class=\"rightBorder\" align=\"center\" valign=\"top\">\n<p class=\"docText\">\u2022<\/p>\n<\/td>\n<td class=\"docTableCell\" align=\"left\" valign=\"top\"><\/td>\n<\/tr>\n<tr>\n<td class=\"rightBorder bottomBorder\" align=\"left\" valign=\"top\">\n<p class=\"docText\"><tt>execve<\/tt><\/p>\n<\/td>\n<td class=\"rightBorder bottomBorder\" align=\"center\" valign=\"top\">\n<p class=\"docText\">\u2022<\/p>\n<\/td>\n<td class=\"rightBorder bottomBorder\" align=\"left\" valign=\"top\"><\/td>\n<td class=\"rightBorder bottomBorder\" align=\"left\" valign=\"top\"><\/td>\n<td class=\"rightBorder bottomBorder\" align=\"center\" valign=\"top\">\n<p class=\"docText\">\u2022<\/p>\n<\/td>\n<td class=\"rightBorder bottomBorder\" align=\"left\" valign=\"top\"><\/td>\n<td class=\"bottomBorder\" align=\"center\" valign=\"top\">\n<p class=\"docText\">\u2022<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"rightBorder\" align=\"left\" valign=\"top\">\n<p class=\"docText\">(letter in name)<\/p>\n<\/td>\n<td class=\"rightBorder\" align=\"left\" valign=\"top\"><\/td>\n<td class=\"rightBorder\" align=\"center\" valign=\"top\">\n<p class=\"docText\"><tt>p<\/tt><\/p>\n<\/td>\n<td class=\"rightBorder\" align=\"center\" valign=\"top\">\n<p class=\"docText\"><tt>l<\/tt><\/p>\n<\/td>\n<td class=\"rightBorder\" align=\"center\" valign=\"top\">\n<p class=\"docText\"><tt>v<\/tt><\/p>\n<\/td>\n<td class=\"rightBorder\" align=\"left\" valign=\"top\"><\/td>\n<td class=\"docTableCell\" align=\"center\" valign=\"top\">\n<p class=\"docText\"><tt>e<\/tt><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u4e0d\u540c\u7684\u7cfb\u7edf\u5bf9\u53c2\u6570\u5217\u8868\u548c\u73af\u5883\u53d8\u91cf\u5217\u8868\u7684\u957f\u5ea6\u90fd\u6709\u9650\u5236\u3002\u8fd9\u4e2a\u9650\u5236\u662f\u901a\u8fc7<span style=\"color: #993300;\">ARG_MAX<\/span>\u5b9a\u4e49\u7684\u3002\u5728POSIX.1\u4e0a\uff0c\u8fd9\u4e2a\u503c\u7684\u957f\u5ea6\u81f3\u5c11\u662f4096\u5b57\u8282\u3002<\/p>\n<p>\u4e3a\u4e86\u7ed5\u5f00\u53c2\u6570\u957f\u5ea6\u7684\u9650\u5236\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528<span style=\"color: #993300;\">xargs<\/span>\u547d\u4ee4\u62c6\u5f00\u957f\u53c2\u6570\u5217\u8868\u3002<\/p>\n<p>\u4f7f\u7528<span style=\"color: #993300;\">exec<\/span>\u51fd\u6570\u53ef\u4ee5\u7ee7\u627f\u5230\u8fd9\u4e9b\u5c5e\u6027\uff1a<\/p>\n<ul>\n<li>PID\u548c\u7236\u8fdb\u7a0b\u7684PID<\/li>\n<li>\u5b9e\u9645\u7684\u7528\u6237ID\u548c\u5b9e\u9645\u7684\u7ec4ID<\/li>\n<li>\u9644\u52a0\u7ec4ID<\/li>\n<li>\u8fdb\u7a0b\u7ec4ID<\/li>\n<li>\u4f1a\u8bddID<\/li>\n<li>\u63a7\u5236\u7740\u7684\u7ec8\u7aef<\/li>\n<li>Time left until alarm clock<\/li>\n<li>\u5f53\u524d\u7684\u5de5\u4f5c\u76ee\u5f55<\/li>\n<li>\u6839\u76ee\u5f55<\/li>\n<li>\u521b\u5efa\u6587\u4ef6\u7684\u63a9\u7801<\/li>\n<li>\u6587\u4ef6\u9501<\/li>\n<li>\u8fdb\u7a0b\u4fe1\u53f7\u63a9\u7801\uff08Process signal mask\uff09<\/li>\n<li>\u5f85\u5904\u7406\u4fe1\u53f7\uff08pending signal\uff09<\/li>\n<li>\u8d44\u6e90\u9650\u5236\uff08resource limits\uff09<\/li>\n<li><span style=\"color: #993300;\">tms_utime<\/span>, <span style=\"color: #993300;\">tms_stime<\/span>, <span style=\"color: #993300;\">tms_cutime<\/span>\u548c<span style=\"color: #993300;\">tms_cstime<\/span>\u7684\u503c<\/li>\n<\/ul>\n<p>\u6253\u5f00\u6587\u4ef6\u7684\u5904\u7406\u4f9d\u8d56\u4e8e\u6bcf\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684<span style=\"color: #993300;\">close-on-exec<\/span>\u6807\u8bb0\u7684\u503c\u3002\u5982\u679c\u8bbe\u7f6e\u4e86\u8fd9\u4e2a\u6807\u8bb0\uff0c\u7ecf\u8fc7<span style=\"color: #993300;\">exec<\/span>\u540e\u4f1a\u5173\u95ed\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u5426\u5219\u662f\u4e00\u76f4\u6253\u5f00\u7684\u3002\u9ed8\u8ba4\u662f\u4e00\u76f4\u6253\u5f00\u7684\uff0c\u9664\u975e\u4f7f\u7528<span style=\"color: #993300;\">fcntl<\/span>\u8bbe\u7f6e<span style=\"color: #993300;\">close-on-exec<\/span>\u6807\u8bb0\u3002<\/p>\n<p>POSIX.1\u6307\u5b9a\u901a\u8fc7exec\u65f6\u8981\u5173\u95ed\u6253\u5f00\u7684\u6587\u4ef6\u5939\u6d41\u3002\u8fd9\u901a\u5e38\u7531<span style=\"color: #993300;\">opendir<\/span>\u51fd\u6570\u8c03\u7528<span style=\"color: #993300;\">fcntl<\/span>\u8bbe\u7f6eclose-on-exec\u6807\u8bb0\u5b8c\u6210\u3002<\/p>\n<p>\u6ce8\u610f\u4f7f\u7528<span style=\"color: #993300;\">exec<\/span>\u65f6\uff0c\u5b9e\u9645\u7528\u6237ID\u548c\u5b9e\u9645\u7ec4ID\u88ab\u4fdd\u5b58\u4e0b\u6765\u4e86\uff0c\u4f46\u662f\u6709\u6548ID\u7684\u6539\u53d8\u8981\u6839\u636e\u88ab\u6267\u884c\u7a0b\u5e8f\u7684SUID\u548cSGID\u4f4d\u7684\u72b6\u6001\u3002\u5982\u679c\u65b0\u7a0b\u5e8f\u8bbe\u7f6e\u4e86SUID\uff0c\u90a3\u4e48\u6709\u6548\u7528\u6237ID\u4f1a\u53d8\u6210\u7a0b\u5e8f\u6240\u6709\u8005\u7684ID\u3002\u5426\u5219\u6709\u6548ID \u4e0d\u80fd\u6539\u53d8\u3002\u6709\u6548\u7ec4ID\u4e5f\u662f\u540c\u6837\u7684\u65b9\u6cd5\u3002\uff08<em><span style=\"color: #ff6600;\">SUID<\/span>\uff0c\u5f53\u8fd0\u884c\u8be5\u6587\u4ef6\u65f6\uff0c\u8fdb\u7a0b\u7684\u6709\u6548\u7528\u6237ID\u53d8\u6210\u6587\u4ef6\u6240\u6709\u8005<\/em>\uff09<\/p>\n<p>\u5728\u5f88\u591aUNIX\u7cfb\u7edf\u5b9e\u73b0\u4e2d\uff0c\u53ea\u6709<strong><span style=\"text-decoration: underline;\"><span style=\"color: #993300; text-decoration: underline;\">execve<\/span><\/span><\/strong>\u662f\u7cfb\u7edf\u8c03\u7528\uff0c\u5176\u5b83\u4e94\u4e2a\u7a0b\u5e8f\u90fd\u4ec5\u4ec5\u662f\u5e93\u51fd\u6570\uff0c<span style=\"text-decoration: underline; color: #993300;\"><strong>\u5b83\u4eec\u6700\u7ec8\u8c03\u7528\u8fd9\u4e2a\u7cfb\u7edf\u8c03\u7528<\/strong><\/span>\u3002\u4e0b\u9762\u56fe\u89e36\u4e2a\u51fd\u6570\u7684\u5173\u7cfb\uff1a<\/p>\n<figure id=\"attachment_429\" aria-describedby=\"caption-attachment-429\" style=\"width: 666px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-429\" src=\"http:\/\/blog.5x44.cn\/wp-content\/uploads\/2016\/08\/exec_function.jpg\" alt=\"6\u4e2aexec\u51fd\u6570\u7684\u5173\u7cfb\" width=\"666\" height=\"154\" srcset=\"https:\/\/www.5x44.cn\/wp-content\/uploads\/2016\/08\/exec_function.jpg 666w, https:\/\/www.5x44.cn\/wp-content\/uploads\/2016\/08\/exec_function-300x69.jpg 300w\" sizes=\"auto, (max-width: 666px) 100vw, 666px\" \/><figcaption id=\"caption-attachment-429\" class=\"wp-caption-text\">6\u4e2aexec\u51fd\u6570\u7684\u5173\u7cfb<\/figcaption><\/figure>\n<p>\u5728\u8fd9\u4e2a\u56fe\u4e2d\u5e93\u51fd\u6570<span style=\"color: #993300;\">execlp<\/span>\u548c<span style=\"color: #993300;\">execvp<\/span>\u5904\u7406<span style=\"color: #993300;\">PATH<\/span>\u73af\u5883\u53d8\u91cf\uff0c\u67e5\u627e\u7b2c\u4e00\u4e2a\u5305\u51fd<em>filename<\/em>\u7684\u53ef\u6267\u884c\u6587\u4ef6\u7684\u76ee\u5f55\u524d\u7f00\u3002<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5f53\u4e00\u4e2a\u8fdb\u7a0b\u8c03\u7528\u67d0\u4e2aexec\u51fd\u6570\uff08execl, execlp, execle, execv, execvp, execve\uff09\u65f6\uff0c\u8fdb\u7a0b\u4f1a\u88ab\u65b0\u7a0b\u5e8f\u5b8c\u5168\u66ff\u6362\uff0c\u7136\u540e\u65b0\u7a0b\u5e8f&#8230;<\/p>\n<p class=\"read-more\"><a class=\"btn btn-default\" href=\"https:\/\/www.5x44.cn\/?p=419\"> Read More<span class=\"screen-reader-text\">  Read More<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[],"class_list":["post-419","post","type-post","status-publish","format-standard","hentry","category-apue"],"_links":{"self":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts\/419","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=419"}],"version-history":[{"count":12,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts\/419\/revisions"}],"predecessor-version":[{"id":475,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts\/419\/revisions\/475"}],"wp:attachment":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=419"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=419"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=419"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}