{"id":512,"date":"2016-09-22T16:34:57","date_gmt":"2016-09-22T08:34:57","guid":{"rendered":"http:\/\/www.5x44.cn\/?p=512"},"modified":"2016-12-01T15:27:19","modified_gmt":"2016-12-01T07:27:19","slug":"%e4%bc%9a%e8%af%9d","status":"publish","type":"post","link":"https:\/\/www.5x44.cn\/?p=512","title":{"rendered":"\u4f1a\u8bdd"},"content":{"rendered":"

\u4f1a\u8bdd\u662f\u4e00\u4e2a\u6216\u591a\u4e2a\u8fdb\u7a0b\u7ec4\u7684\u96c6\u5408\u3002<\/p>\n

\"figure9-6\"<\/p>\n

\u8fdb\u7a0b\u7ec4\u4e2d\u7684\u8fdb\u7a0b\u901a\u5e38\u662f\u7531shell \u7ba1\u9053\u653e\u8fdb\u53bb\u7684\u3002\u4e0a\u56fe\u6240\u793a\u53ef\u80fd\u662f\u7531\u5982\u4e0b\u547d\u4ee4\u5efa\u7acb\u8d77\u6765\u7684\uff1a<\/p>\n

proc1 | proc2 &<\/span><\/p>\n

proc3 | proc4 | proc5<\/span><\/p>\n

\u901a\u8fc7\u8c03\u7528setsid<\/span>\u51fd\u6570\u5c06\u8fdb\u7a0b\u8fde\u63a5\u5230\u4e00\u4e2a\u65b0\u7684\u4f1a\u8bdd\u91cc\u3002<\/p>\n\n\n\n\n
\n
#include <unistd.h>\r\n\r\npid_t setsid(void);\r\n<\/pre>\n<\/td>\n<\/tr>\n
\n

Returns: process group ID if OK, 1 on error<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u5982\u679c\u8c03\u7528\u51fd\u6570\u7684\u8fdb\u7a0b\u4e0d\u662f\u8fdb\u7a0b\u7ec4\u957f\uff0c\u8fd9\u4e2a\u51fd\u6570\u5efa\u7acb\u4e00\u4e2a\u65b0\u4f1a\u8bdd<\/span>\u3002\u8fd9\u65f6\u4f1a\u6709\u4e09\u4ef6\u4e8b\u53d1\u751f\uff1a<\/p>\n

    \n
  1. \u8be5\u8fdb\u7a0b\u4f1a\u53d8\u6210\u65b0\u4f1a\u8bdd\u7684\u4f1a\u8bdd\u957f\uff08session leader\uff09\u3002\uff08\u4f1a\u8bdd\u957f\u5efa\u7acb\u4f1a\u8bdd\uff09\u8fd9\u65f6\u8be5\u8fdb\u7a0b\u662f\u65b0\u4f1a\u8bdd\u4e2d\u552f\u4e00\u7684\u8fdb\u7a0b\u3002<\/li>\n
  2. \u8be5\u8fdb\u7a0b\u4f1a\u53d8\u6210\u65b0\u8fdb\u7a0b\u7ec4\u7684\u8fdb\u7a0b\u7ec4\u957f\uff08process group leader\uff09\u3002\u65b0\u8fdb\u7a0b\u7ec4ID\u662f\u8be5\u8fdb\u7a0b\u7684\u8fdb\u7a0bID\u3002<\/li>\n
  3. \u8be5\u8fdb\u7a0b\u6ca1\u6709\u63a7\u5236\u7ec8\u7aef\u3002\u5982\u679c\u8fdb\u7a0b\u5728\u8c03\u7528setsid<\/span>\u4e4b\u524d\u6709\u63a7\u5236\u7ec8\u7aef\uff0c\u90a3\u4e48\u5173\u8054\u4e5f\u4f1a\u88ab\u7834\u574f\u3002\uff08if the process had a controlling terminal before calling setsid<\/span>, that association is broken\uff09<\/li>\n<\/ol>\n

    \u5982\u679c\u8c03\u7528\u7684\u8fdb\u7a0b\u5df2\u7ecf\u662f\u8fdb\u7a0b\u7ec4\u957f\uff0c\u8fd9\u4e2a\u51fd\u6570\u4f1a\u8fd4\u56de\u4e00\u4e2a\u9519\u8bef<\/span>\u3002\u4e3a\u4e86\u4fdd\u8bc1\u4e0d\u4f1a\u53d1\u751f\u8fd9\u79cd\u60c5\u51b5\uff0c\u5728\u5e73\u65f6\u7684\u7ec3\u4e60\u4e2d\uff0c\u5148\u662f\u8c03\u7528fork<\/span>\uff0c\u4e4b\u540e\u7ed3\u675f\u7236\u8fdb\u7a0b\uff0c\u5b50\u8fdb\u7a0b\u7ee7\u7eed\u8fd0\u884c\u3002\u6211\u4eec\u53ef\u4ee5\u4fdd\u8bc1\u5b50\u8fdb\u7a0b\u4e0d\u662f\u8fdb\u7a0b\u7ec4\u957f\uff0c\u56e0\u4e3a\u7236\u8fdb\u7a0b\u7684\u8fdb\u7a0b\u7ec4ID\u88ab\u5b50\u8fdb\u7a0b\u7ee7\u627f\uff0c\u4f46\u662f\u5b50\u8fdb\u7a0b\u7684ID\u662f\u65b0\u5206\u914d\u7684\u3002\u56e0\u6b64\u5b50\u8fdb\u7a0b\u7684\u8fdb\u7a0bID\u4e0d\u53ef\u80fd\u7b49\u4e8e\u5b83\u7ee7\u627f\u8fc7\u6765\u7684\u8fdb\u7a0b\u7ec4ID.<\/p>\n

    Single UNIX Specification\u53ea\u6709\u201c\u4f1a\u8bdd\u957f\u201d\u8fd9\u4e2a\u6982\u5ff5\u3002\u8fd9\u91cc\u6ca1\u6709\u7c7b\u4f3c\u8fdb\u7a0b\u7ec4ID\u6216\u8fdb\u7a0bID\u4e00\u6837\u7684\u201c\u4f1a\u8bddID\u201d\u7684\u6982\u5ff5\u3002\u5f88\u660e\u663e\uff0c\u4f1a\u8bdd\u957f\u662f\u4e00\u4e2a\u6709\u552f\u4e00\u8fdb\u7a0bID\u7684\u5355\u72ec\u8fdb\u7a0b\uff0c\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u548c\u8fd9\u4e2a\u4f1a\u8bdd\u957f\u901a\u8baf\u3002\u8fd9\u79cd\u4f1a\u8bddID\u7684\u6982\u5ff5\u662f\u4eceSVR4\u5f15\u5165\u7684\u3002\u5386\u53f2\u4e0a\uff0c\u57fa\u4e8eBSD\u7684\u7cfb\u7edf\u4e0d\u652f\u6301\u8fd9\u79cd\u6982\u5ff5\uff0c\u4f46\u662f\u4e5f\u5df2\u7ecf\u5f00\u59cb\u66f4\u65b0\u5305\u542b\u5b83\u3002getsid<\/span>\u51fd\u6570\u8fd4\u56de\u4e00\u4e2a\u8fdb\u7a0b\u7684\u4f1a\u8bdd\u957f\u7684\u8fdb\u7a0b\u7ec4ID\u3002getsid<\/span>\u51fd\u6570\u5df2\u7ecf\u505a\u4e3aXSI\u6269\u5c55\u88ab\u5305\u542b\u5728Single UNIX Specification\u4e2d\u3002<\/p>\n

    \u4f1a\u8bddID\u548c\u201c\u4f1a\u8bdd\u957f\u7684\u8fdb\u7a0b\u7ec4ID\u201d\u76f8\u7b49\uff0c\u56e0\u4e3a\u4f1a\u8bdd\u957f\u4e00\u76f4\u662f\u8fdb\u7a0b\u7ec4\u957f\u3002<\/p>\n

    getsid<\/span>\u51fd\u6570\u8fd4\u56de\u8fdb\u7a0b\u4f1a\u8bdd\u957f\u7684\u8fdb\u7a0b\u7ec4ID\u3002<\/p>\n\n\n\n
    \n\n\n\n\n
    \n
    #include <unistd.h>\r\n\r\npid_t getsid(pid_t pid<\/span>);\r\n<\/span><\/pre>\n<\/td>\n<\/tr>\n
    \n

    Returns: session leader’s process group ID if OK, 1 on error<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u5982\u679cpid<\/em>\u662f0\uff08\u96f6\uff09\uff0cgetsid<\/span>\u8fd4\u56de\u8c03\u7528\u8fdb\u7a0b\u7684\u4f1a\u8bdd\u957f\u7684\u8fdb\u7a0b\u7ec4ID\u3002\u51fa\u4e8e\u5b89\u5168\u539f\u56e0\uff0c\u5982\u679cpid<\/em>\u548c\u8c03\u7528\u8fdb\u7a0b\u4e0d\u5728\u540c\u4e00\u4f1a\u8bdd\u7684\u8bdd\uff0c\u4e00\u4e9b\u5b9e\u73b0\u53ef\u4ee5\u9650\u5236\u8c03\u7528\u8fdb\u7a0b\u83b7\u5f97\u4f1a\u8bdd\u957f\u7684\u8fdb\u7a0b\u7ec4ID\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

    \u4f1a\u8bdd\u662f\u4e00\u4e2a\u6216\u591a\u4e2a\u8fdb\u7a0b\u7ec4\u7684\u96c6\u5408\u3002 \u8fdb\u7a0b\u7ec4\u4e2d\u7684\u8fdb\u7a0b\u901a\u5e38\u662f\u7531shell \u7ba1\u9053\u653e\u8fdb\u53bb\u7684\u3002\u4e0a\u56fe\u6240\u793a\u53ef\u80fd\u662f\u7531\u5982\u4e0b\u547d\u4ee4\u5efa\u7acb\u8d77\u6765\u7684\uff1a proc1 | proc2 & p…<\/p>\n

    Read More Read More<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[],"class_list":["post-512","post","type-post","status-publish","format-standard","hentry","category-apue"],"_links":{"self":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts\/512","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=512"}],"version-history":[{"count":8,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts\/512\/revisions"}],"predecessor-version":[{"id":521,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts\/512\/revisions\/521"}],"wp:attachment":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=512"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=512"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=512"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}