\u5728Linux\u7cfb\u7edf\u7684\u76ee\u5f55\/var\/run\u4e0b\u9762\u4e00\u822c\u6211\u4eec\u90fd\u4f1a\u770b\u5230\u5f88\u591a\u7684*.pid\u6587\u4ef6\u3002\u800c\u4e14\u5f80\u5f80\u65b0\u5b89\u88c5\u7684\u7a0b\u5e8f\u5728\u8fd0\u884c\u540e\u4e5f\u4f1a\u5728\/var\/run\u76ee\u5f55\u4e0b\u9762\u4ea7\u751f\u81ea\u5df1\u7684pid\u6587\u4ef6\u3002\u90a3\u4e48\u8fd9\u4e9bpid\u6587\u4ef6\u6709\u4ec0\u4e48\u4f5c\u7528\u5462\uff1f\u5b83\u7684\u5185\u5bb9\u53c8\u662f\u4ec0\u4e48\u5462\uff1f<\/p>\n
(1) pid\u6587\u4ef6\u7684\u5185\u5bb9\uff1apid\u6587\u4ef6\u4e3a\u6587\u672c\u6587\u4ef6\uff0c\u5185\u5bb9\u53ea\u6709\u4e00\u884c, \u8bb0\u5f55\u4e86\u8be5\u8fdb\u7a0b\u7684ID\u3002<\/p>\n
\u7528cat\u547d\u4ee4\u53ef\u4ee5\u770b\u5230\u3002<\/p>\n
(2) pid\u6587\u4ef6\u7684\u4f5c\u7528\uff1a\u9632\u6b62\u8fdb\u7a0b\u542f\u52a8\u591a\u4e2a\u526f\u672c\u3002\u53ea\u6709\u83b7\u5f97pid\u6587\u4ef6(\u56fa\u5b9a\u8def\u5f84\u56fa\u5b9a\u6587\u4ef6\u540d)\u5199\u5165\u6743\u9650(F_WRLCK)\u7684\u8fdb\u7a0b\u624d\u80fd\u6b63\u5e38\u542f\u52a8\u5e76\u628a\u81ea\u8eab\u7684PID\u5199\u5165\u8be5\u6587\u4ef6\u4e2d\u3002\u5176\u5b83\u540c\u4e00\u4e2a\u7a0b\u5e8f\u7684\u591a\u4f59\u8fdb\u7a0b\u5219\u81ea\u52a8\u9000\u51fa\u3002<\/p>\n
(3) \u7f16\u7a0b\u6280\u5de7\uff1a<\/p>\n
\u8c03\u7528fcntl\u8bbe\u7f6epid\u6587\u4ef6\u7684\u9501\u5b9aF_SETLK\u72b6\u6001\uff0c\u5176\u4e2d\u9501\u5b9a\u7684\u6807\u5fd7\u4f4dF_WRLCK\u3002<\/p>\n
\u5982\u679c\u6210\u529f\u9501\u5b9a\uff0c\u5219\u5199\u5165\u8fdb\u7a0b\u5f53\u524dPID\uff0c\u8fdb\u7a0b\u7ee7\u7eed\u5f80\u4e0b\u6267\u884c\u3002<\/p>\n
\u5982\u679c\u9501\u5b9a\u4e0d\u6210\u529f\uff0c\u8bf4\u660e\u5df2\u7ecf\u6709\u540c\u6837\u7684\u8fdb\u7a0b\u5728\u8fd0\u884c\u4e86\uff0c\u5f53\u524d\u8fdb\u7a0b\u7ed3\u675f\u9000\u51fa\u3002<\/p>\n
lock.l_type = F_WRLCK;
\nlock.l_whence = SEEK_SET;<\/p>\n
if (fcntl(fd, F_SETLK, &lock) < 0){
\n\/\/\u9501\u5b9a\u4e0d\u6210\u529f, \u9000\u51fa……
\n}
\nsprintf (buf, “%d\\n”, (int) pid);
\npidsize = strlen(buf);
\nif ((tmp = write (fd, buf, pidsize)) != (int)pidsize){
\n\/\/\u5199\u5165\u4e0d\u6210\u529f, \u9000\u51fa……
\n}<\/p>\n
(4) \u4e00\u4e9b\u6ce8\u610f\u4e8b\u9879\uff1a
\ni) \u5982\u679c\u8fdb\u7a0b\u9000\u51fa\uff0c\u5219\u8be5\u8fdb\u7a0b\u52a0\u7684\u9501\u81ea\u52a8\u5931\u6548\u3002
\nii) \u5982\u679c\u8fdb\u7a0b\u5173\u95ed\u4e86\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26fd\uff0c \u5219\u52a0\u7684\u9501\u5931\u6548\u3002(\u6574\u4e2a\u8fdb\u7a0b\u8fd0\u884c\u671f\u95f4\u4e0d\u80fd\u5173\u95ed\u6b64\u6587\u4ef6\u63cf\u8ff0\u7b26)
\niii) \u9501\u7684\u72b6\u6001\u4e0d\u4f1a\u88ab\u5b50\u8fdb\u7a0b\u7ee7\u627f\u3002\u5982\u679c\u8fdb\u7a0b\u5173\u95ed\u5219\u9501\u5931\u6548\u800c\u4e0d\u7ba1\u5b50\u8fdb\u7a0b\u662f\u5426\u5728\u8fd0\u884c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5728Linux\u7cfb\u7edf\u7684\u76ee\u5f55\/var\/run\u4e0b\u9762\u4e00\u822c\u6211\u4eec\u90fd\u4f1a\u770b\u5230\u5f88\u591a\u7684*.pid\u6587\u4ef6\u3002\u800c\u4e14\u5f80\u5f80\u65b0\u5b89\u88c5\u7684\u7a0b\u5e8f\u5728\u8fd0\u884c\u540e\u4e5f … \u9605\u8bfb\u66f4\u591a<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[3,49,5],"tags":[834],"class_list":["post-3380","post","type-post","status-publish","format-standard","hentry","category-hemanual","category-linux","category-jishu","tag-pid"],"aioseo_notices":[],"jetpack_featured_media_url":"","jetpack-related-posts":[],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts\/3380","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/comments?post=3380"}],"version-history":[{"count":1,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts\/3380\/revisions"}],"predecessor-version":[{"id":3381,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts\/3380\/revisions\/3381"}],"wp:attachment":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/media?parent=3380"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/categories?post=3380"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/tags?post=3380"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}