{"id":527,"date":"2024-05-06T17:27:10","date_gmt":"2024-05-06T09:27:10","guid":{"rendered":"http:\/\/www.madbull.site\/?p=527"},"modified":"2024-05-06T17:34:36","modified_gmt":"2024-05-06T09:34:36","slug":"%e5%87%bd%e6%95%b0%e6%b5%8b%e8%af%95-fork","status":"publish","type":"post","link":"https:\/\/www.madbull.site\/?p=527","title":{"rendered":"\u51fd\u6570\u6d4b\u8bd5&#8211;fork"},"content":{"rendered":"\n<div class=\"wp-block-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\">\n<p><strong>fork\u4e09\u4e2a\u5b50\u8fdb\u7a0b\uff0c\u7b49\u5f85\u4ed6\u4eec\u9000\u51fa\u7684\u72b6\u6001<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include \"stdio.h\"\n#include \"stdlib.h\"\n#include &lt;unistd.h&gt;\n#include &lt;sys\/types.h&gt;\n#include &lt;sys\/wait.h&gt;\n\nint main(void) {\n    int child_ret;\n    pid_t pid_fork, pid_ret;\n    printf(\"before fork\\n\");\n    int count = 3 ; \n\nnext:\n    if ((pid_fork = fork()) &lt; 0) {\n        \/\/ fork \u51fa\u9519\n        printf(\"fork error\");\n    } else if (pid_fork == 0) {\n        \/\/ \u5b50\u8fdb\u7a0b\n        printf(\"child : process's pid=%d,sleep 1 sec\\n\", getpid());\n        sleep(count);\n        printf(\"child : process's pid=%d, quit\\n\",getpid());\n        printf(\"--------------------------------------------\\n\");\n        return 10 ;\n        \/\/ exit(3);\n    } else {\n        count -- ; \n        if(count &gt;0 ) goto next ;\n        printf(\"father : parent process wait child terminate...\\n\");\n        while(1) {\n            pid_ret = wait(&amp;child_ret);   \/\/ \u5982\u679c\u6ca1\u6709\u5b50\u8fdb\u7a0b\uff0c\u5219\u8fd4\u56de -1 \u7acb\u5373\u8fd4\u56de\n            printf(\"father : wait process's pid=%d,status=0x%X,exit value=%d(0x%X) child_ret = %d\\n=========================\\n\\n\", pid_ret, child_ret,\n                       WEXITSTATUS(child_ret), WEXITSTATUS(child_ret), child_ret);\n            if(pid_ret == -1) break ;\n            usleep(500000) ;\n        }\n        printf(\"father : over...\\n\");\n    }\n\n    exit(0);\n} <\/code><\/pre>\n\n\n\n<div style=\"margin-top:var(--wp--preset--spacing--20);margin-bottom:var(--wp--preset--spacing--20);height:5px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<\/div>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"713\" height=\"500\" src=\"https:\/\/www.madbull.site\/wp-content\/uploads\/2024\/05\/fork.png\" alt=\"\" class=\"wp-image-535\" srcset=\"https:\/\/www.madbull.site\/wp-content\/uploads\/2024\/05\/fork.png 713w, https:\/\/www.madbull.site\/wp-content\/uploads\/2024\/05\/fork-300x210.png 300w\" sizes=\"auto, (max-width: 713px) 100vw, 713px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>fork wait \u6d4b\u8bd5<\/p>\n","protected":false},"author":1,"featured_media":450,"comment_status":"open","ping_status":"open","sticky":false,"template":"single-with-sidebar","format":"standard","meta":{"footnotes":""},"categories":[156,154],"tags":[170,171,172],"class_list":["post-527","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-c-c","category-154","tag-fork","tag-wait","tag-172"],"_links":{"self":[{"href":"https:\/\/www.madbull.site\/index.php?rest_route=\/wp\/v2\/posts\/527","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.madbull.site\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.madbull.site\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.madbull.site\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.madbull.site\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=527"}],"version-history":[{"count":4,"href":"https:\/\/www.madbull.site\/index.php?rest_route=\/wp\/v2\/posts\/527\/revisions"}],"predecessor-version":[{"id":536,"href":"https:\/\/www.madbull.site\/index.php?rest_route=\/wp\/v2\/posts\/527\/revisions\/536"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.madbull.site\/index.php?rest_route=\/wp\/v2\/media\/450"}],"wp:attachment":[{"href":"https:\/\/www.madbull.site\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=527"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.madbull.site\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=527"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.madbull.site\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=527"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}