{"id":155336,"date":"2020-08-29T08:46:32","date_gmt":"2020-08-29T00:46:32","guid":{"rendered":"http:\/\/4563.org\/?p=155336"},"modified":"2020-08-29T08:46:32","modified_gmt":"2020-08-29T00:46:32","slug":"%e5%85%b3%e4%ba%8e-execlp%e5%92%8c-waitpid%e7%9a%84%e4%b8%80%e4%b8%aa%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=155336","title":{"rendered":"\u5173\u4e8e execlp()\u548c waitpid()\u7684\u4e00\u4e2a\u95ee\u9898"},"content":{"rendered":"<div>\n<div>\n<div>\n<h1>                  \u5173\u4e8e execlp()\u548c waitpid()\u7684\u4e00\u4e2a\u95ee\u9898               <\/h1>\n<p> <\/p>\n<div>\n<div> <span>\u8cc7\u6df1\u5927\u4f6c : zxCoder <\/span>  <span><i><\/i> 6<\/span> <\/div>\n<div> <\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<div isfirst=\"1\"> <\/p>\n<p>\u6211\u5728\u8bfb\u4e00\u4e2a OJ \u5224\u9898\u6838\u5fc3\u7684\u4ee3\u7801\uff0c\u91cc\u9762\u5173\u4e8e\u7279\u5224\u7684\u4ee3\u7801\uff0cfork \u4e86\u4e00\u4e2a\u5b50\u8fdb\u7a0b\uff0c\u8c03\u7528 execlp()\u53bb\u6267\u884c spj\uff0c\u6ca1\u6709\u62a5\u9519\uff0c\u4f46\u662f\u7236\u8fdb\u7a0b\u91cc waitpid()\u5c31\u62a5\u9519\u4e86\uff0c\u8fd4\u56de\u503c\u662f-1\uff0c\u9519\u8bef\u7801 10\uff0cno child processes\uff0c\u8fd9\u662f\u600e\u4e48\u56de\u4e8b<\/p>\n<pre><code>    int status = 0;     pid_t pid_spj = fork();     if (pid_spj &lt; 0) {         LOG_WARNING(\"error for spj failed, %d:%s\", errno, strerror(errno));         output_result(judge_conf::OJ_SE, -errno, judge_conf::EXIT_COMPARE_SPJ_FORK);         exit(judge_conf::EXIT_COMPARE_SPJ_FORK);     } else if (pid_spj == 0) {         freopen(file_spj.c_str(), \"w\", stdout);         if (EXIT_SUCCESS == malarm(ITIMER_REAL, judge_conf::spj_time_limit)) {             log_close();             if (execlp((spj_path + \"\/\" + problem::spj_exe_file).c_str(),                        problem::spj_exe_file.c_str(), input_file.c_str(),                        output_file.c_str(), output_file_std.c_str(), NULL) &lt; 0) {                 printf(\"spj execlp errorn\");             }         }     } else {         \/\/no child process         if (waitpid(pid_spj, &amp;status, 0) &lt; 0) {             LOG_BUG(\"waitpid failed, %d:%s\", errno, strerror(errno));             output_result(judge_conf::OJ_SE, -errno, judge_conf::EXIT_COMPARE_SPJ_WAIT);             exit(judge_conf::EXIT_COMPARE_SPJ_WAIT);         }     }  <\/code><\/pre>\n<\/p><\/div>\n<div> <b>\u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (<span>1<\/span>)        <\/div>\n<div> <\/div>\n<\/p><\/div>\n<\/p><\/div>\n<ul>\n<li data-pid=\"3285921\" data-uid=\"2\">\n<div>\n<div>\n<div> <span>\u8cc7\u6df1\u5927\u4f6c : Nitroethane <\/span>  <\/div>\n<div> <i title=\"\u5f15\u7528\"><\/i>  <span>          <\/span> <\/div>\n<\/p><\/div>\n<div>                                                             \u9519\u8bef\u7801\u7ed9\u4f60\u8bf4\u4e86\u554a\uff0c\u6ca1\u6709\u5b50\u8fdb\u7a0b\u3002waitpid \u51fd\u6570\u662f\u7236\u8fdb\u7a0b\u7b49\u5f85\u5b50\u8fdb\u7a0b\u7684\u7ed3\u675f\uff0c\u5982\u679c\u8fd4\u56de ECHILD\uff0c\u4e5f\u5c31\u662f 10\uff0c\u8bf4\u660e\u8c03\u7528\u8fdb\u7a0b\u6ca1\u6709 PID \u4e3a pid_spj \u7684\u5b50\u8fdb\u7a0b                                                            <\/div>\n<\/p><\/div>\n<\/li>\n<li>\n","protected":false},"excerpt":{"rendered":"<p>\u5173\u4e8e execlp()\u548c wait&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/155336"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=155336"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/155336\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=155336"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=155336"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=155336"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}