{"id":160,"date":"2016-01-28T02:40:28","date_gmt":"2016-01-28T02:40:28","guid":{"rendered":""},"modified":"2016-01-28T02:40:28","modified_gmt":"2016-01-28T02:40:28","slug":"","status":"publish","type":"post","link":"http:\/\/weizn.net\/?p=160","title":{"rendered":"\u5173\u4e8esocket\u8c03\u7528send()\u4ea7\u751fSIGPIPE\u4fe1\u53f7"},"content":{"rendered":"

\n\t    \u5199\u4e86\u4e00\u4e2a\u670d\u52a1\u5668\u7a0b\u5e8f,\u5728Linux\u4e0b\u6d4b\u8bd5.  \u4f46\u662f\u670d\u52a1\u5668\u603b\u662f\u83ab\u540d\u9000\u51fa\uff0c\u6ca1\u6709core\u6587\u4ef6.<\/span>\u6700\u540egdb\u786e\u5b9a\u95ee\u9898\u4e3a, \u5bf9\u4e00\u4e2a\u5bf9\u7aef\u5df2\u7ecf\u5173\u95ed\u7684socket\u8c03\u7528send()\u5c06\u4f1a\u751f\u6210SIGPIPE\u4fe1\u53f7, \u8be5\u4fe1\u53f7\u9ed8\u8ba4\u7ed3\u675f\u8fdb\u7a0b.<\/span>
\n    \u5177\u4f53\u7684\u5206\u6790\u53ef\u4ee5\u7ed3\u5408TCP\u7684”\u56db\u6b21\u63e1\u624b”\u5173\u95ed. TCP\u662f\u5168\u53cc\u5de5\u7684\u4fe1\u9053, \u53ef\u4ee5\u770b\u4f5c\u4e24\u6761\u5355\u5de5\u4fe1\u9053, TCP\u8fde\u63a5\u4e24\u7aef\u7684\u4e24\u4e2a\u7aef\u70b9\u5404\u8d1f\u8d23\u4e00\u6761. \u5f53\u5bf9\u7aef\u8c03\u7528close\u65f6, \u867d\u7136\u672c\u610f\u662f\u5173\u95ed\u6574\u4e2a\u4e24\u6761\u4fe1\u9053, \u4f46\u672c\u7aef\u53ea\u662f\u6536\u5230FIN\u5305. \u6309\u7167TCP\u534f\u8bae\u7684\u8bed\u4e49, \u8868\u793a\u5bf9\u7aef\u53ea\u662f\u5173\u95ed\u4e86\u5176\u6240\u8d1f\u8d23\u7684\u90a3\u4e00\u6761\u5355\u5de5\u4fe1\u9053, \u4ecd\u7136\u53ef\u4ee5\u7ee7\u7eed\u63a5\u6536\u6570\u636e. \u4e5f\u5c31\u662f\u8bf4, \u56e0\u4e3aTCP\u534f\u8bae\u7684\u9650\u5236, \u4e00\u4e2a\u7aef\u70b9\u65e0\u6cd5\u83b7\u77e5\u5bf9\u7aef\u7684socket\u662f\u8c03\u7528\u4e86close\u8fd8\u662fshutdown.<\/span>
\n\u5bf9\u4e00\u4e2a\u5df2\u7ecf\u6536\u5230FIN\u5305\u7684socket\u8c03\u7528read\u65b9\u6cd5, \u5982\u679c\u63a5\u6536\u7f13\u51b2\u5df2\u7a7a, \u5219\u8fd4\u56de0, \u8fd9\u5c31\u662f\u5e38\u8bf4\u7684\u8868\u793a\u8fde\u63a5\u5173\u95ed. \u4f46\u7b2c\u4e00\u6b21\u5bf9\u5176\u8c03\u7528write\u65b9\u6cd5\u65f6, \u5982\u679c\u53d1\u9001\u7f13\u51b2\u6ca1\u95ee\u9898, \u4f1a\u8fd4\u56de\u6b63\u786e\u5199\u5165(\u53d1\u9001). \u4f46\u53d1\u9001\u7684\u62a5\u6587\u4f1a\u5bfc\u81f4\u5bf9\u7aef\u53d1\u9001RST\u62a5\u6587, \u56e0\u4e3a\u5bf9\u7aef\u7684socket\u5df2\u7ecf\u8c03\u7528\u4e86close, \u5b8c\u5168\u5173\u95ed, \u65e2\u4e0d\u53d1\u9001, \u4e5f\u4e0d\u63a5\u6536\u6570\u636e. \u6240\u4ee5, \u7b2c\u4e8c\u6b21\u8c03\u7528write\u65b9\u6cd5(\u5047\u8bbe\u5728\u6536\u5230RST\u4e4b\u540e), \u4f1a\u751f\u6210SIGPIPE\u4fe1\u53f7, \u5bfc\u81f4\u8fdb\u7a0b\u9000\u51fa.<\/span>
\n\u4e3a\u4e86\u907f\u514d\u8fdb\u7a0b\u9000\u51fa, \u53ef\u4ee5\u6355\u83b7SIGPIPE\u4fe1\u53f7, \u6216\u8005\u5ffd\u7565\u5b83, \u7ed9\u5b83\u8bbe\u7f6eSIG_IGN\u4fe1\u53f7\u5904\u7406\u51fd\u6570:<\/span>
\nsignal(SIGPIPE, SIG_IGN);<\/span>
\n\u8fd9\u6837, \u7b2c\u4e8c\u6b21\u8c03\u7528write\u65b9\u6cd5\u65f6, \u4f1a\u8fd4\u56de-1, \u540c\u65f6errno\u7f6e\u4e3aSIGPIPE. \u7a0b\u5e8f\u4fbf\u80fd\u77e5\u9053\u5bf9\u7aef\u5df2\u7ecf\u5173\u95ed.<\/span>\n<\/p>\n

\n\t    \u5728linux\u4e0b\u5199socket\u7684\u7a0b\u5e8f\u7684\u65f6\u5019\uff0c\u5982\u679c\u5c1d\u8bd5send\u5230\u4e00\u4e2adisconnected socket\u4e0a\uff0c\u5c31\u4f1a\u8ba9\u5e95\u5c42\u629b\u51fa\u4e00\u4e2aSIGPIPE\u4fe1\u53f7\u3002<\/span>
\n\u8fd9\u4e2a\u4fe1\u53f7\u7684\u7f3a\u7701\u5904\u7406\u65b9\u6cd5\u662f\u9000\u51fa\u8fdb\u7a0b\uff0c\u5927\u591a\u6570\u65f6\u5019\u8fd9\u90fd\u4e0d\u662f\u6211\u4eec\u671f\u671b\u7684\u3002\u56e0\u6b64\u6211\u4eec\u9700\u8981\u91cd\u8f7d\u8fd9\u4e2a\u4fe1\u53f7\u7684\u5904\u7406\u65b9\u6cd5\u3002\u8c03\u7528\u4ee5\u4e0b\u4ee3\u7801\uff0c\u5373\u53ef\u5b89\u5168\u7684\u5c4f\u853dSIGPIPE\uff1a<\/span>
\nsignal \uff08SIGPIPE\uff0c SIG_IGN\uff09\uff1b<\/span>
\n\u6211\u7684\u7a0b\u5e8f\u4ea7\u751f\u8fd9\u4e2a\u4fe1\u53f7\u7684\u539f\u56e0\u662f: <\/span>
\nclient\u7aef\u901a\u8fc7 pipe \u53d1\u9001\u4fe1\u606f\u5230server\u7aef\u540e\uff0c\u5c31\u5173\u95edclient\u7aef, \u8fd9\u65f6server\u7aef,\u8fd4\u56de\u4fe1\u606f\u7ed9 client \u7aef\u65f6\u5c31\u4ea7\u751fBroken pipe \u4fe1\u53f7\u4e86\uff0c\u670d\u52a1\u5668\u5c31\u4f1a\u88ab\u7cfb\u7edf\u7ed3\u675f\u4e86\u3002<\/span>\n<\/p>\n

\n\t\u5bf9\u4e8e\u4ea7\u751f\u4fe1\u53f7\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u4ea7\u751f\u4fe1\u53f7\u524d\u5229\u7528\u65b9\u6cd5 signal(int signum, sighandler_t handler) \u8bbe\u7f6e\u4fe1\u53f7\u7684\u5904\u7406\u3002\u5982\u679c\u6ca1\u6709\u8c03\u7528\u6b64\u65b9\u6cd5\uff0c\u7cfb\u7edf\u5c31\u4f1a\u8c03\u7528\u9ed8\u8ba4\u5904\u7406\u65b9\u6cd5\uff1a\u4e2d\u6b62\u7a0b\u5e8f\uff0c\u663e\u793a\u63d0\u793a\u4fe1\u606f(\u5c31\u662f\u6211\u4eec\u7ecf\u5e38\u9047\u5230\u7684\u95ee\u9898)\u3002\u6211\u4eec\u53ef\u4ee5\u8c03\u7528\u7cfb\u7edf\u7684\u5904\u7406\u65b9\u6cd5\uff0c\u4e5f\u53ef\u4ee5\u81ea\u5b9a\u4e49\u5904\u7406\u65b9\u6cd5\u3002<\/span>\n<\/p>\n

\n\t\u7cfb\u7edf\u91cc\u8fb9\u5b9a\u4e49\u4e86\u4e09\u79cd\u5904\u7406\u65b9\u6cd5\uff1a <\/span>
\n(1)SIG_DFL\u4fe1\u53f7\u4e13\u7528\u7684\u9ed8\u8ba4\u52a8\u4f5c:<\/span>
\n\u3000\u3000(a)\u5982\u679c\u9ed8\u8ba4\u52a8\u4f5c\u662f\u6682\u505c\u7ebf\u7a0b\uff0c\u5219\u8be5\u7ebf\u7a0b\u7684\u6267\u884c\u88ab\u6682\u65f6\u6302\u8d77\u3002\u5f53\u7ebf\u7a0b\u6682\u505c\u671f\u95f4\uff0c\u53d1\u9001\u7ed9\u7ebf\u7a0b\u7684\u4efb\u4f55\u9644\u52a0\u4fe1\u53f7\u90fd\u4e0d\u4ea4\u4ed8\uff0c\u76f4\u5230\u8be5\u7ebf\u7a0b\u5f00\u59cb\u6267\u884c\uff0c\u4f46\u662fSIGKILL\u9664\u5916\u3002<\/span>
\n\u3000\u3000(b)\u628a\u6302\u8d77\u4fe1\u53f7\u7684\u4fe1\u53f7\u52a8\u4f5c\u8bbe\u7f6e\u6210SIG_DFL\uff0c\u4e14\u5176\u9ed8\u8ba4\u52a8\u4f5c\u662f\u5ffd\u7565\u4fe1\u53f7 (SIGCHLD)\u3002<\/span>
\n(2)SIG_IGN\u5ffd\u7565\u4fe1\u53f7<\/span>
\n\u3000\u3000(a)\u8be5\u4fe1\u53f7\u7684\u4ea4\u4ed8\u5bf9\u7ebf\u7a0b\u6ca1\u6709\u5f71\u54cd<\/span>
\n\u3000\u3000(b)\u7cfb\u7edf\u4e0d\u5141\u8bb8\u628aSIGKILL\u6216SIGTOP\u4fe1\u53f7\u7684\u52a8\u4f5c\u8bbe\u7f6e\u4e3aSIG_DFL<\/span>
\n3)SIG_ERR  <\/span>\n<\/p>\n

\n\t\u9879\u76ee\u4e2d\u6211\u8c03\u7528\u4e86signal(SIGPIPE, SIG_IGN), \u8fd9\u6837\u4ea7\u751f  SIGPIPE \u4fe1\u53f7\u65f6\u5c31\u4e0d\u4f1a\u4e2d\u6b62\u7a0b\u5e8f\uff0c\u76f4\u63a5\u628a\u8fd9\u4e2a\u4fe1\u53f7\u5ffd\u7565\u6389\u3002<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

\n\t\u6211\u5199\u4e86\u4e00\u4e2a\u670d\u52a1\u5668\u7a0b\u5e8f,\u5728Linux\u4e0b\u6d4b\u8bd5\uff0c\u7136\u540e\u7528C++\u5199\u4e86\u5ba2\u6237\u7aef\u7528\u5343\u4e07\u7ea7\u522b\u6570\u91cf\u7684\u77ed\u94fe\u63a5\u8fdb\u884c\u538b\u529b\u6d4b\u8bd5.  \u4f46\u662f\u670d\u52a1\u5668\u603b\u662f\u83ab\u540d\u9000\u51fa\uff0c\u6ca1\u6709core\u6587\u4ef6.<\/span>
\n\u6700\u540egdb\u786e\u5b9a\u95ee\u9898\u4e3a, \u5bf9\u4e00\u4e2a\u5bf9\u7aef\u5df2\u7ecf\u5173\u95ed\u7684socket\u8c03\u7528\u4e24\u6b21write, \u7b2c\u4e8c\u6b21\u5c06\u4f1a\u751f\u6210SIGPIPE\u4fe1\u53f7, \u8be5\u4fe1\u53f7\u9ed8\u8ba4\u7ed3\u675f\u8fdb\u7a0b.<\/span>
\n\u5177\u4f53\u7684\u5206\u6790\u53ef\u4ee5\u7ed3\u5408TCP\u7684”\u56db\u6b21\u63e1\u624b”\u5173\u95ed. 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