{"id":1632,"date":"2015-11-12T12:17:19","date_gmt":"2015-11-12T04:17:19","guid":{"rendered":"http:\/\/www.51cos.com\/?p=1632"},"modified":"2015-11-12T12:17:19","modified_gmt":"2015-11-12T04:17:19","slug":"linux%e4%b8%adsystem%e5%92%8cexec%e5%87%bd%e6%95%b0%e7%9a%84%e5%8c%ba%e5%88%ab","status":"publish","type":"post","link":"http:\/\/www.51cos.com\/?p=1632","title":{"rendered":"Linux\u4e2dsystem\u548cexec\u51fd\u6570\u7684\u533a\u522b"},"content":{"rendered":"<p>system\u662f\u7528shell\u6765\u8c03\u7528\u7a0b\u5e8f=fork+exec+waitpid\uff0c\u800cexec\u662f\u76f4\u63a5\u8ba9\u4f60\u7684\u7a0b\u5e8f\u4ee3\u66ff\u7528\u6765\u7684\u7a0b\u5e8f\u8fd0\u884c\u3002<\/p>\n<p>system \u662f\u5728\u5355\u72ec\u7684\u8fdb\u7a0b\u4e2d\u6267\u884c\u547d\u4ee4\uff0c\u5b8c\u4e86\u8fd8\u4f1a\u56de\u5230\u4f60\u7684\u7a0b\u5e8f\u4e2d\u3002\u800cexec\u51fd\u6570\u662f\u76f4\u63a5\u5728\u4f60\u7684\u8fdb\u7a0b\u4e2d\u6267\u884c\u65b0\u7684\u7a0b\u5e8f\uff0c\u65b0\u7684\u7a0b\u5e8f\u4f1a\u628a\u4f60\u7684\u7a0b\u5e8f\u8986\u76d6\uff0c\u9664\u975e\u8c03\u7528\u51fa\u9519\uff0c\u5426\u5219\u4f60\u518d\u4e5f\u56de\u4e0d\u5230exec\u540e\u9762\u7684\u4ee3\u7801\uff0c\u5c31\u662f\u8bf4\u4f60\u7684\u7a0b\u5e8f\u5c31\u53d8\u6210\u4e86exec\u8c03\u7528\u7684\u90a3\u4e2a\u7a0b\u5e8f\u4e86\u3002<\/p>\n<p>\u770b\u4e00\u4e0b\uff0c\u4e0b\u9762\u7684\u4f8b\u5b50.<\/p>\n<p>\u4f8b\u5b501<\/p>\n<pre class=\"prettyprint linenums\" >\nsystem(\"your_program\");<br \/>\nprintf(\"You can see me! \");<\/p>\n<p>\u4f8b\u5b502<\/p>\n<pre class=\"prettyprint linenums\" >\nexec(\"your_program\");<br \/>\nprintf(\"You can't see me! \");<\/p>\n<p>\u5728\u4f8b\u5b501\u4e2d\uff0c\u5728\u4f60\u7684\u7a0b\u5e8f\u6267\u884c\u5b8c\u6bd5\u4ee5\u540e\uff0c\u4f1a\u6267\u884cprintf\u8bed\u53e5\u3002<br \/>\n\u5728\u4f8b\u5b502\u4e2d\uff0c\u7531\u4e8eexec\u5c06\u7a0b\u5e8fyour_program\u4ee3\u66ff\u4e86\u672c\u8eab\uff0c\u56e0\u6b64\u7a0b\u5e8f\u4e0d\u518d\u4f1a\u6267\u884cprintf\u8bed\u53e5\u3002<\/p>\n<p>\u5728Linux\u4e0b\uff0cexec\u901a\u5e38\u4f1a\u548cfork\u8bed\u53e5\u4e00\u8d77\u7528\u3002<\/p>\n<p>\u770b\u4e0b\u9762\u7684\u8fd9\u4e2a\u4f8b\u5b50:<\/p>\n<pre class=\"prettyprint linenums\" >\npid_t pid = fork();<br \/>\nif (pid < 0) {\n    printf(\u201cfork error!\u201d);\n    exit(-1);\n} else if (pid == 0) {\n\/\/\u8fd9\u91cc\u662f\u5b50\u8fdb\u7a0b\n    printf(\"I'm son! \");\n\/\/\u6267\u884c\u5176\u5b83\u7684\u7a0b\u5e8f\n    exec(\"your_program\");\n} else {\n\/\/\u8fd9\u91cc\u662f\u7236\u8fdb\u7a0b\n    printf(\"i'm father!\");\n    wait();\/\/\u7b49\u5f85\u5b50\u8fdb\u7a0b\u7ed3\u675f\u540e\u8fd4\u56de\n    exit(0);\n}\n \n<\/p>\n","protected":false},"excerpt":{"rendered":"<p>system\u662f\u7528shell\u6765\u8c03\u7528\u7a0b\u5e8f=fork+exec+waitpid\uff0c\u800cexec\u662f\u76f4\u63a5\u8ba9\u4f60\u7684\u7a0b\u5e8f\u4ee3\u66ff\u7528\u6765\u7684 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-1632","post","type-post","status-publish","format-standard","hentry"],"_links":{"self":[{"href":"http:\/\/www.51cos.com\/index.php?rest_route=\/wp\/v2\/posts\/1632","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.51cos.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.51cos.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.51cos.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.51cos.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1632"}],"version-history":[{"count":2,"href":"http:\/\/www.51cos.com\/index.php?rest_route=\/wp\/v2\/posts\/1632\/revisions"}],"predecessor-version":[{"id":1634,"href":"http:\/\/www.51cos.com\/index.php?rest_route=\/wp\/v2\/posts\/1632\/revisions\/1634"}],"wp:attachment":[{"href":"http:\/\/www.51cos.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1632"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.51cos.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1632"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.51cos.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1632"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}