{"id":2006,"date":"2016-12-09T11:28:25","date_gmt":"2016-12-09T03:28:25","guid":{"rendered":"http:\/\/www.51cos.com\/?p=2006"},"modified":"2016-12-27T12:17:50","modified_gmt":"2016-12-27T04:17:50","slug":"linux-c%e7%bc%96%e7%a8%8b%ef%bc%9a%e5%a6%82%e4%bd%95%e8%8e%b7%e5%8f%96%e9%85%8d%e7%bd%ae%e6%96%87%e4%bb%b6%e4%b8%ad%e7%9a%84%e5%86%85%e5%ae%b9%ef%bc%8c%e5%b9%b6%e5%9c%a8c%e4%bb%a3%e7%a0%81%e4%b8%ad","status":"publish","type":"post","link":"http:\/\/www.51cos.com\/?p=2006","title":{"rendered":"Linux C\u7f16\u7a0b\uff1a\u5229\u7528\u7ba1\u9053\u83b7\u53d6\u914d\u7f6e\u6587\u4ef6\u4e2d\u7684\u5185\u5bb9\uff0c\u5e76\u5728C\u4ee3\u7801\u4e2d\u76f4\u63a5\u5904\u7406"},"content":{"rendered":"

\u76f4\u63a5\u7ed9\u4ee3\u7801\uff0c\u4ee5\u4e0b\u4ee3\u7801\u662f\u5728\u9a71\u52a8\u914d\u7f6e\u6587\u4ef6\u4e2d\u83b7\u53d6\u5b58\u5728\u7684\u5b57\u7b26\u4e32<\/p>\n

\n
#define SIZE 10<\/p>\n
int main()
\n{
\n    FILE *fp;
\n    char buffer[SIZE];
\n    char *cmd_str=\"cat \/dev\/mydevice | grep 0x1101\";  <\/p>\n
    memset(buffer,'\\0',SIZE);
\n    fp=popen(cmd_str,\"r\");
\n    fread(buffer,SIZE,1,fp);
\n    printf(\"strlen=%d\\n\",strlen(buffer));  \/\/strlen\u5927\u4e8e0\uff0c\u8bf4\u660e\u83b7\u53d6\u5230\u5b57\u7b26\u4e32
\n    pclose(fp);       <\/p>\n
} <\/p>\n
popen()\u51fd\u6570\u901a\u8fc7\u521b\u5efa\u4e00\u4e2a\u7ba1\u9053\uff0c\u8c03\u7528fork()\u4ea7\u751f\u4e00\u4e2a\u5b50\u8fdb\u7a0b\uff0c\u6267\u884c\u4e00\u4e2ashell\u4ee5\u8fd0\u884c\u547d\u4ee4\u6765\u5f00\u542f\u4e00\u4e2a\u8fdb\u7a0b\u3002\u8fd9\u4e2a\u7ba1\u9053\u5fc5\u987b\u7531pclose()\u51fd\u6570\u5173\u95ed\uff0c\u800c\u4e0d\u662ffclose()\u51fd\u6570\u3002<\/p>\n
system\u5c31\u662f\u6267\u884cshell\u547d\u4ee4\u6700\u540e\u8fd4\u56de\u662f\u5426\u6267\u884c\u6210\u529f\uff0cpopen\u6267\u884c\u547d\u4ee4\u5e76\u4e14\u901a\u8fc7\u7ba1\u9053\u548cshell\u547d\u4ee4\u8fdb\u884c\u901a\u4fe1\u3002<\/p>\n
system\u548cpopen\u90fd\u662f\u6267\u884c\u4e86\u7c7b\u4f3c\u7684\u8fd0\u884c\u6d41\u7a0b\uff0c\u5927\u81f4\u662ffork->execl->return\u3002\u4f46\u662f\u6211\u4eec\u770b\u5230system\u5728\u6267\u884c\u671f\u95f4\u8c03\u7528\u8fdb\u7a0b\u4f1a\u4e00\u76f4\u7b49\u5f85shell\u547d\u4ee4\u6267\u884c\u5b8c\u6210(waitpid\u7b49\u5f85\u5b50\u8fdb\u7a0b\u7ed3\u675f)\u624d\u8fd4\u56de\uff0c\u4f46\u662fpopen\u65e0\u987b\u7b49\u5f85shell\u547d\u4ee4\u6267\u884c\u5b8c\u6210\u5c31\u8fd4\u56de\u4e86\u3002\u6211\u4eec\u53ef\u4ee5\u7406\u89e3system\u4e3a\u4e32\u884c\u6267\u884c\uff0c\u5728\u6267\u884c\u671f\u95f4\u8c03\u7528\u8fdb\u7a0b\u653e\u5f03\u4e86\u201d\u63a7\u5236\u6743\u201d\uff0cpopen\u4e3a\u5e76\u884c\u6267\u884c\u3002<\/p>\n
https:\/\/linux.die.net\/man\/3\/popen<\/p>\n","protected":false},"excerpt":{"rendered":"
\u76f4\u63a5\u7ed9\u4ee3\u7801\uff0c\u4ee5\u4e0b\u4ee3\u7801\u662f\u5728\u9a71\u52a8\u914d\u7f6e\u6587\u4ef6\u4e2d\u83b7\u53d6\u5b58\u5728\u7684\u5b57\u7b26\u4e32 #define SIZE 10 int main()  […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-2006","post","type-post","status-publish","format-standard","hentry"],"_links":{"self":[{"href":"http:\/\/www.51cos.com\/index.php?rest_route=\/wp\/v2\/posts\/2006","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=2006"}],"version-history":[{"count":2,"href":"http:\/\/www.51cos.com\/index.php?rest_route=\/wp\/v2\/posts\/2006\/revisions"}],"predecessor-version":[{"id":2031,"href":"http:\/\/www.51cos.com\/index.php?rest_route=\/wp\/v2\/posts\/2006\/revisions\/2031"}],"wp:attachment":[{"href":"http:\/\/www.51cos.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2006"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.51cos.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2006"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.51cos.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2006"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}