{"id":63,"date":"2014-11-07T16:15:44","date_gmt":"2014-11-07T08:15:44","guid":{"rendered":"http:\/\/www.zhuyanbin.com\/?p=63"},"modified":"2014-11-07T16:15:44","modified_gmt":"2014-11-07T08:15:44","slug":"tcp%e8%bf%9e%e6%8e%a5%e5%bc%82%e5%b8%b8%e6%96%ad%e5%bc%80%e7%9a%84%e6%a3%80%e6%b5%8b","status":"publish","type":"post","link":"https:\/\/www.yanbin888.com\/?p=63","title":{"rendered":"TCP\u8fde\u63a5\u5f02\u5e38\u65ad\u5f00\u7684\u68c0\u6d4b"},"content":{"rendered":"

TCP\u662f\u4e00\u79cd\u9762\u5411\u8fde\u63a5\u7684\u534f\u8bae\uff0c\u8fde\u63a5\u7684\u5efa\u7acb\u548c\u65ad\u5f00\u9700\u8981\u901a\u8fc7\u6536\u53d1\u76f8\u5e94\u7684\u5206\u8282\u6765\u5b9e\u73b0\u3002\u67d0\u4e9b\u65f6\u5019\uff0c\u7531\u4e8e\u7f51\u7edc\u7684\u6545\u969c\u6216\u662f\u4e00\u65b9\u4e3b\u673a\u7684\u7a81\u7136\u5d29\u6e83\u800c\u53e6\u4e00\u65b9\u65e0\u6cd5\u68c0\u6d4b\u5230\uff0c\u4ee5\u81f4\u59cb\u7ec8\u4fdd\u6301\u7740\u4e0d\u5b58\u5728\u7684\u8fde\u63a5\u3002\u4e0b\u9762\u4ecb\u7ecd\u4e00\u79cd\u65b9\u6cd5\u6765\u68c0\u6d4b\u8fd9\u79cd\u5f02\u5e38\u65ad\u5f00\u7684\u60c5\u51b5<\/p>\n

1) \u5728TCP\u534f\u8bae\u4e2d\u63d0\u4f9b\u4e86KEEPALIVE\u68c0\u6d4b\u3002\u8be5\u9009\u9879\u4f7f\u80fd\u540e\uff0c\u5728\u4e00\u4e2aTCP\u8fde\u63a5\u4e0a\uff0c\u82e5\u6307\u5b9a\u7684\u4e00\u6bb5\u65f6\u95f4\u5185\u6ca1\u6709\u6570\u636e\u4ea4\u6362\uff0c\u5219\u81ea\u52a8\u53d1\u9001\u5206\u8282\u7b49\u5f85\u5bf9\u65b9\u786e\u8ba4\u3002<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0SO_KEEPALIVE : \u8be5\u9009\u9879\u8bbe\u7f6e\u662f\u5426\u6253\u5f00\u63a2\u6d4b
\nTCP_KEEPIDLE : \u5f00\u59cb\u53d1\u9001\u63a2\u6d4b\u5206\u8282\u524d\u7b49\u5f85\u7684\u7a7a\u95f2\u65f6\u95f4
\nTCP_KEEPINTVL: \u4e24\u6b21\u53d1\u9001\u63a2\u6d4b\u5206\u8282\u7684\u65f6\u95f4\u95f4\u9694
\nTCP_KEEPCNT: \u5224\u5b9a\u65ad\u5f00\u524d\u53d1\u9001\u63a2\u6d4b\u5206\u8282\u7684\u6b21\u6570<\/p>\n

2) \u8bbe\u5b9a\u63a2\u6d4b\u76f8\u5173\u9009\u9879\u503c<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0int keepalive = 1;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/ \u6253\u5f00\u63a2\u6d4b
\nint keepidle = 60;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/ \u5f00\u59cb\u63a2\u6d4b\u524d\u7684\u7a7a\u95f2\u7b49\u5f85\u65f6\u95f4
\nint keepintvl = 10;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/ \u53d1\u9001\u63a2\u6d4b\u5206\u8282\u7684\u65f6\u95f4\u95f4\u9694
\nint keepcnt = 3;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/ \u53d1\u9001\u63a2\u6d4b\u5206\u8282\u7684\u6b21\u6570<\/p>\n

3) \u8bbe\u7f6e\u5957\u63a5\u5b57\u7684\u5c5e\u6027<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, (void *)&keepalive, sizeof (keepalive) < 0)
\n{
\nperror(\u201cfail to set SO_KEEPALIVE\u201d);
\nexit(-1);
\n}
\nif (setsockopt(sockfd, SOL_TCP, TCP_KEEPIDLE, (void *) &keepidle, sizeof (keepidle) < 0)
\n{
\nperror(\u201cfail to set SO_KEEPIDLE\u201d);
\nexit(-1);
\n}
\nif (setsockopt(sockfd, SOL_TCP, TCP_KEEPINTVL, (void *)&keepintvl, sizeof (keepintvl) < 0)
\n{
\nperror(\u201cfail to set SO_KEEPINTVL\u201d);
\nexit(-1);
\n}
\nif (setsockopt(sockfd, SOL_TCP, TCP_KEEPCNT, (void *)&keepcnt, sizeof (keepcnt) < 0)
\n{
\nperror(\u201cfail to set SO_KEEPALIVE\u201d);
\nexit(-1);
\n}<\/p>\n

\u4e00\u65e6\u6253\u5f00KEEPALIVE\u63a2\u6d4b\uff0c\u5f53TCP\u8fde\u63a5\u5f02\u5e38\u65ad\u5f00\u540e\uff0c\u5bf9sockfd\u8fdb\u884crecv\u64cd\u4f5c\u4f1a\u8fd4\u56de-1\uff0c\u5e76\u4e14errno\u7684\u503c\u4e3aETIMEDOUT\u3002<\/p>\n

\u8fd9\u6837\u4e00\u6765\u5c31\u53ef\u4ee5\u5f88\u65b9\u4fbf\u7684\u5728\u5e94\u7528\u7a0b\u5e8f\u4e2d\u68c0\u6d4bTCP\u8fde\u63a5\u7684\u60c5\u51b5\uff0c\u5982\u679c\u68c0\u6d4b\u5230\u5f02\u5e38\u65ad\u5f00\u6700\u7b80\u5355\u7684\u5904\u7406\u5c31\u662f\u5173\u95ed\u8fde\u63a5\u3002<\/p>\n

link:\u00a0http:\/\/www.embedu.org\/Column\/Column318.htm<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

TCP\u662f\u4e00\u79cd\u9762\u5411\u8fde\u63a5\u7684\u534f\u8bae\uff0c\u8fde\u63a5\u7684\u5efa\u7acb\u548c\u65ad\u5f00\u9700\u8981\u901a\u8fc7\u6536\u53d1\u76f8\u5e94\u7684\u5206\u8282\u6765\u5b9e\u73b0\u3002\u67d0\u4e9b\u65f6\u5019\uff0c\u7531\u4e8e\u7f51\u7edc\u7684\u6545\u969c\u6216\u662f\u4e00\u65b9\u4e3b\u673a …<\/span> Read More →<\/span><\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,2],"tags":[17],"class_list":["post-63","post","type-post","status-publish","format-standard","hentry","category-c","category-linux","tag-socket"],"_links":{"self":[{"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=\/wp\/v2\/posts\/63","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=63"}],"version-history":[{"count":1,"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=\/wp\/v2\/posts\/63\/revisions"}],"predecessor-version":[{"id":64,"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=\/wp\/v2\/posts\/63\/revisions\/64"}],"wp:attachment":[{"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=63"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=63"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=63"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}