=Start=<\/p>\n
\u4e4b\u524d\u5728\u7b2c\u4e00\u6b21\u5b66\u4e60Go \u8bed\u8a00\u7684\u65f6\u5019\u5176\u5b9e\u6574\u7406\u4e86\u4e00\u7bc7\u6587\u7ae0\u300cLinux\u4e0b\u5b88\u62a4\u8fdb\u7a0b\u7684Golang\u8bed\u8a00\u5b9e\u73b0<\/a>\u300d\uff0c\u4f46\u56e0\u4e3a\u540e\u7eed\u6709\u5176\u4ed6\u4e8b\u60c5\uff0c\u6240\u4ee5\u5c31\u6ca1\u6709\u7ee7\u7eed\u4e0b\u53bb\u4e86\u3002\u6700\u8fd1\u521a\u597d\u5728\u590d\u4e60Go \u8bed\u8a00\uff0c\u6240\u4ee5\u60f3\u7740\u518d\u6574\u7406\u5b9e\u8df5\u4e00\u4e0b\u7528Go \u8bed\u8a00\u5b9e\u73b0\u5b88\u62a4\u8fdb\u7a0b\u7684\u529f\u80fd\uff0c\u5c31\u6709\u4e86\u8fd9\u7bc7\u6587\u7ae0\u3002<\/p>\n \u9996\u5148\uff0c\u5982\u679c\u4f60\u53ea\u662f\u60f3\u5b9e\u73b0\u7c7b\u4f3c\u4e8e\u5b88\u62a4\u8fdb\u7a0b\u5728\u540e\u53f0\u9ed8\u9ed8\u8fd0\u884c\u7684\u529f\u80fd\u7684\u8bdd\uff0c\u53ef\u4ee5\u8003\u8651\u5148\u7528 <\/p>\n \u5982\u679c\u4f60\u8fd8\u662f\u5e0c\u671b\u80fd\u7528Go \u8bed\u8a00\u5b9e\u73b0\u4e00\u4e2adaemon\u8fdb\u7a0b\uff0c\u53ef\u4ee5\u53c2\u8003\u4e00\u4e0b\u8fd9\u6bb5\u4ee3\u7801\uff08\u5728Linux\u73af\u5883\u4e0b\u6d4b\u8bd5\u9a8c\u8bc1OK\uff0cmacOS\u672a\u901a\u8fc7\uff09\uff1a<\/p>\n \u5982\u679c\u4f60\u7528C\u6216\u662f\u5176\u5b83\u7f16\u7a0b\u8bed\u8a00\u5f00\u53d1\u8fc7daemon\u8fdb\u7a0b\u7684\u8bdd\u4f60\u5c31\u4f1a\u53d1\u73b0\uff0c\u5b9e\u73b0daemon\u7684\u4e3b\u8981\u903b\u8f91\u6b65\u9aa4\u5728\u5404\u4e2a\u8bed\u8a00\u4e2d\u90fd\u662f\u4e00\u6837\u7684\uff1a<\/p>\n 1\u3001\u521b\u5efa\u5b50\u8fdb\u7a0b\uff0c\u7236\u8fdb\u7a0b\u9000\u51fa fork() \u53ea\u4e0d\u8fc7\u5728Go \u8bed\u8a00\u4e2d\uff0c\u5bf9\u6211\u6765\u8bf4\uff0c\u73b0\u5728\u5b9e\u73b0\u8d77\u6765\u6700\u5927\u7684\u95ee\u9898\u5728\u4e8e\u2014\u2014\u4e0d\u8bba\u662fSyscall.RawSyscall()\u8fd8\u662fSyscall.Syscall()\u5b83\u4eec\u7684\u8d44\u6599\u90fd\u592a\u5c11\u4e86\uff0c\u53c2\u6570\u3001\u8fd4\u56de\u503c\u7684\u529f\u80fd\u548c\u4f5c\u7528\u90fd\u53ea\u80fd\u9760\u731c\u2026\u2026<\/p>\n <\/p>\n =END=<\/p>\n","protected":false},"excerpt":{"rendered":" =Start= \u7f18\u7531\uff1a \u4e4b\u524d\u5728\u7b2c\u4e00\u6b21\u5b66\u4e60Go \u8bed\u8a00\u7684\u65f6\u5019\u5176\u5b9e\u6574\u7406\u4e86\u4e00\u7bc7\u6587\u7ae0\u300cLinux\u4e0b\u5b88\u62a4\u8fdb\u7a0b\u7684Golang […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23,7,12],"tags":[717,564,1247],"class_list":["post-4157","post","type-post","status-publish","format-standard","hentry","category-knowledgebase-2","category-programing","category-tools","tag-daemon","tag-golang","tag-syscall"],"views":7747,"_links":{"self":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/4157","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/comments?post=4157"}],"version-history":[{"count":1,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/4157\/revisions"}],"predecessor-version":[{"id":4158,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/4157\/revisions\/4158"}],"wp:attachment":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/media?parent=4157"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/categories?post=4157"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/tags?post=4157"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}\u6b63\u6587\uff1a<\/h4>\n
\u53c2\u8003\u89e3\u7b54\uff1a<\/h5>\n
go build<\/code>\u00a0\u547d\u4ee4\u6784\u5efa\u51fa\u53ef\u6267\u884c\u7a0b\u5e8f\uff0c\u7136\u540e\uff08\u4e8c\u8005\u9009\u5176\u4e00\u5373\u53ef\uff09\uff1a<\/p>\n\n
package main\r\n\r\nimport (\r\n \"fmt\"\r\n \"log\"\r\n \"os\"\r\n \"runtime\"\r\n \"syscall\"\r\n \"time\"\r\n)\r\n\r\nfunc daemon(nochdir, noclose int) int {\r\n var ret, ret2 uintptr\r\n var err syscall.Errno\r\n darwin := runtime.GOOS == \"darwin\"\r\n \/\/ \u5982\u679c\u5f53\u524d\u8fdb\u7a0b\u7684ppid\u7b49\u4e8e1\uff0c\u5219\u8868\u660e\u5df2\u7ecf\u662f\u4e00\u4e2a\u5b88\u62a4\u8fdb\u7a0b\u4e86\uff0c\u76f4\u63a5\u8fd4\u56de\u5373\u53ef(already a daemon)\r\n if syscall.Getppid() == 1 {\r\n return 0\r\n }\r\n \/\/ \u901a\u8fc7 syscall \u5305\u8c03\u7528 fork \u6d3e\u751f\u5b50\u8fdb\u7a0b\r\n ret, ret2, err = syscall.RawSyscall(syscall.SYS_FORK, 0, 0, 0)\r\n if err != 0 {\r\n log.Println(\"syscall.RawSyscall\")\r\n return -1\r\n }\r\n \/\/ ret2 \u8868\u793a\u5b50\u8fdb\u7a0b\u6536\u5230\u7684 fork \u8fd4\u56de\uff08\u6682\u4e0d\u5b8c\u5168\u786e\u5b9a\uff1f\uff09\uff0c\u6b63\u5e38\u6d3e\u751f\u60c5\u51b5\u4e0b ret2 \u5e94\u8be5\u7b49\u4e8e0\r\n if ret2 < 0 {\r\n os.Exit(-1)\r\n }\r\n \/\/ \u9488\u5bf9 darwin \u7cfb\u7edf\u7684\u9519\u8bef\u5904\u7406\uff08\u6ca1\u5565\u7528\uff0c\u5728macOS\u4e0a\u8fd8\u662f\u8dd1\u4e0d\u4e86\uff09\r\n if darwin && ret2 == 1 {\r\n log.Printf(\"OS: %v, ret: %v, ret2: %v\\n\", darwin, ret, ret2)\r\n \/\/ ret = 0\r\n }\r\n \/\/ ret \u8868\u793afork\u6210\u529f\u6267\u884c\u540e\u4ea7\u751f\u7684\u5b50\u8fdb\u7a0b\u7684pid\uff08\u7531\u7236\u8fdb\u7a0b\u63a5\u6536\uff09\r\n if ret > 0 {\r\n os.Exit(0) \/\/ \u9000\u51fa\u5f53\u524d\u7684\u7236\u8fdb\u7a0b\r\n }\r\n\r\n \/\/ create a new SID for the child process\r\n s_ret, s_errno := syscall.Setsid()\r\n if s_errno != nil {\r\n log.Printf(\"Error: syscall.Setsid errno: %d\", s_errno)\r\n }\r\n if s_ret < 0 {\r\n log.Println(\"syscall.Setsid\")\r\n return -1\r\n }\r\n\r\n \/\/ \u8c03\u7528 fork \u6d3e\u751f\u5b50\u8fdb\u7a0b\r\n ret, ret2, err = syscall.RawSyscall(syscall.SYS_FORK, 0, 0, 0)\r\n if err != 0 {\r\n log.Println(\"syscall.RawSyscall\")\r\n return -1\r\n }\r\n \/\/ ret2 \u8868\u793a\u5b50\u8fdb\u7a0b\u6536\u5230\u7684 fork \u8fd4\u56de\uff0c\u6b63\u5e38\u6d3e\u751f\u60c5\u51b5\u4e0b ret2 \u5e94\u8be5\u7b49\u4e8e0\r\n if ret2 < 0 {\r\n os.Exit(-1)\r\n }\r\n \/\/ ret \u8868\u793afork\u6210\u529f\u6267\u884c\u540e\u4ea7\u751f\u7684\u5b50\u8fdb\u7a0b\u7684pid\uff08\u7531\u7236\u8fdb\u7a0b\u63a5\u6536\uff09\r\n if ret > 0 {\r\n os.Exit(0) \/\/ \u9000\u51fa\u5f53\u524d\u7684\u7236\u8fdb\u7a0b\r\n }\r\n\r\n if nochdir == 0 {\r\n os.Chdir(\"\/\")\r\n }\r\n \/* Change the file mode mask *\/\r\n _ = syscall.Umask(0)\r\n\r\n if noclose == 0 {\r\n f, e := os.OpenFile(\"\/dev\/null\", os.O_RDWR, 0)\r\n if e == nil {\r\n fd := f.Fd()\r\n syscall.Dup2(int(fd), int(os.Stdin.Fd()))\r\n syscall.Dup2(int(fd), int(os.Stdout.Fd()))\r\n syscall.Dup2(int(fd), int(os.Stderr.Fd()))\r\n }\r\n }\r\n return 0\r\n}\r\n\r\nfunc main() {\r\n daemon(0, 1)\r\n for {\r\n fmt.Println(\"hello\")\r\n time.Sleep(2 * time.Second)\r\n }\r\n}<\/pre>\n
\n2\u3001\u5b50\u8fdb\u7a0b\u521b\u5efa\u65b0\u4f1a\u8bdd setsid()
\n3\u3001\u518d\u6b21\u521b\u5efa\u5b50\u8fdb\u7a0b\u7ed3\u675f\u5f53\u524d\u8fdb\u7a0b fork() #\u901a\u8fc7\u4f7f\u8fdb\u7a0b\u4e0d\u518d\u662f\u4f1a\u8bdd\u9996\u8fdb\u7a0b\u6765\u7981\u6b62\u8fdb\u7a0b\u91cd\u65b0\u6253\u5f00\u63a7\u5236\u7ec8\u7aef
\n4\u3001\u6539\u53d8\u5f53\u524d\u5de5\u4f5c\u76ee\u5f55 chdir()
\n5\u3001\u91cd\u8bbe\u6587\u4ef6\u6743\u9650\u63a9\u7801 umask()
\n6\u3001\u5173\u95ed\u65e0\u5173\u6587\u4ef6\u63cf\u8ff0\u7b26 close()<\/p>\n
\n\u4e00\u4e2a\u8fdb\u7a0b\u662f\u5426\u662f\u5b88\u62a4\u8fdb\u7a0b\u7684\u9a8c\u8bc1\u65b9\u6cd5\uff08\u5224\u65ad\u662f\u5426\u7b26\u5408\u5982\u4e0b\u8981\u6c42\uff09\uff1a<\/strong><\/h6>\n
\n
\u53c2\u8003\u94fe\u63a5\uff1a<\/h5>\n
\n
\nhttps:\/\/golang.org\/src\/syscall\/syscall_unix.go?s=751:820#L21<\/a>
\nhttps:\/\/godoc.org\/golang.org\/x\/sys\/unix#RawSyscall<\/a><\/li>\n