{"id":3117,"date":"2011-06-08T20:54:54","date_gmt":"2011-06-08T12:54:54","guid":{"rendered":"http:\/\/edsionte.com\/techblog\/?p=3117"},"modified":"2011-06-12T15:28:21","modified_gmt":"2011-06-12T07:28:21","slug":"tcp%e5%b9%b6%e5%8f%91%e6%9c%8d%e5%8a%a1%e5%99%a8%e7%a8%8b%e5%ba%8f%e8%ae%be%e8%ae%a1","status":"publish","type":"post","link":"http:\/\/edsionte.com\/techblog\/archives\/3117","title":{"rendered":"TCP\u5e76\u53d1\u670d\u52a1\u5668\u7a0b\u5e8f\u8bbe\u8ba1"},"content":{"rendered":"<h3>TCP\u5ba2\u6237\/\u670d\u52a1\u5668\u7a0b\u5e8f\u8bbe\u8ba1\u6a21\u578b-\u5e76\u53d1\u670d\u52a1\u5668<\/h3>\n<p>\u4e0a\u6587\u4e2d\u6240\u8bf4\u7684\u8fed\u4ee3\u670d\u52a1\u5668\u7b80\u5355\u6613\u61c2\uff0c\u5c06\u5b83\u4f5c\u4e3a\u5b66\u4e60socket\u7f16\u7a0b\u7684\u4f8b\u5b50\u518d\u9002\u5408\u4e0d\u8fc7\u4e86\u3002\u4f46\u662f\u5728\u4e00\u822c\u7684\u5b9e\u9645\u5e94\u7528\u4e2d\u6211\u4eec\u5e76\u4e0d\u4f1a\u4f7f\u7528\u8fd9\u4e2a\u7b80\u5355\u7684\u8fed\u4ee3\u670d\u52a1\u5668\uff0c\u56e0\u4e3a\u8fd9\u6837\u7684\u670d\u52a1\u5668\u6bcf\u6b21\u53ea\u80fd\u670d\u52a1\u4e00\u4e2a\u5ba2\u6237\uff0c\u5982\u679c\u8fd9\u4e2a\u5ba2\u6237\u8bf7\u6c42\u957f\u65f6\u95f4\u5360\u7528\u670d\u52a1\u5668\uff0c\u90a3\u4e48\u5176\u4ed6\u5ba2\u6237\u5c06\u4e00\u76f4\u4e0d\u80fd\u88ab\u670d\u52a1\u3002\u8f83\u4e3a\u7406\u60f3\u7684\u60c5\u51b5\u662f\u670d\u52a1\u5668\u53ef\u4ee5\u540c\u65f6\u4e3a\u591a\u4e2a\u5ba2\u6237\u670d\u52a1\uff0c\u63a5\u4e0b\u6765\u5c06\u8981\u8bf4\u660e\u7684\u5e76\u53d1\u670d\u52a1\u5668\u5c31\u53ef\u4ee5\u6ee1\u8db3\u8fd9\u6837\u7684\u8981\u6c42\u3002<\/p>\n<h4>1.\u5e76\u53d1\u670d\u52a1\u5668\u539f\u7406<\/h4>\n<p>\u5173\u4e8e\u5e76\u53d1\u670d\u52a1\u5668\u7684\u57fa\u672c\u539f\u7406\u53ef\u4ee5\u53c2\u8003\u672c\u535a\u5ba2\u4e4b\u524d\u7684<a href=\"http:\/\/edsionte.com\/techblog\/archives\/2930\" target=\"_blank\">\u6587\u7ae0<\/a>\uff0c\u8fd9\u91cc\u4e0d\u5728\u8d58\u8ff0\u3002\u4e0b\u9762\u5c06\u901a\u8fc7\u4e00\u4e2a\u5177\u6709\u5e76\u53d1\u670d\u52a1\u5668\u7684C\/S\u6a21\u578b\u793a\u4f8b\u6765\u8bf4\u660e\u5e76\u53d1\u670d\u52a1\u5668\u7a0b\u5e8f\u8bbe\u8ba1\u7684\u7ec6\u8282\u3002<\/p>\n<h4>2\u5ba2\u6237\u7a0b\u5e8f\u8bbe\u8ba1<\/h4>\n<p>\u5ba2\u6237\u7a0b\u5e8f\u4e0e\u4e0a\u6587\u6240\u8ff0\u7684\u5ba2\u6237\u7a0b\u5e8f\u7c7b\u4f3c\uff0c\u53ea\u4e0d\u8fc7\u5728\u5ba2\u6237\u7aef\u8fdb\u884cconnect\u4e4b\u540e\uff0c\u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u5668\u4e4b\u95f4\u7684\u6240\u6709\u6570\u636e\u4ea4\u4e92\u90fd\u5c01\u88c5\u5728\u4e86str_cli\u51fd\u6570\u4e2d\u3002\u5ba2\u6237\u7a0b\u5e8f\u4e3b\u51fd\u6570\u5728\u8c03\u7528\u8be5\u51fd\u6570\u65f6\u4e0d\u4ec5\u8981\u5411\u8be5\u51fd\u6570\u4f20\u9012\u5957\u63a5\u5b57\uff0c\u8fd8\u8981\u4f20\u9012\u6807\u51c6\u8f93\u5165\u6587\u4ef6\u6307\u9488stdin\u3002\u5177\u4f53\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre class=\"brush:c\">void str_cli(FILE *fp, int sockfd)\r\n{\r\n\tchar sendline[DATA_MAX], recvline[DATA_MAX];\r\n\r\n\tmemset(sendline, 0, DATA_MAX);\r\n\tmemset(recvline, 0, DATA_MAX);\r\n\r\n\twhile(fgets(sendline, DATA_MAX, fp) != NULL) {\r\n\t\tif (write(sockfd, sendline, strlen(sendline)) &lt; 0) {\r\n\t\t\tprintf(\"write error!\\n\");\r\n\t\t\texit(1);\r\n\t\t}\r\n\r\n\t\tif (read(sockfd, recvline, DATA_MAX) == 0) {\r\n\t\t\tprintf(\"read error!\\n\");\r\n\t\t\texit(1);\r\n\t\t}\r\n\t\tfputs(recvline, stdout);\r\n\r\n          \tmemset(sendline, 0, DATA_MAX);\r\n         \tmemset(recvline, 0, DATA_MAX);\r\n\t}\r\n}<\/pre>\n<p>\u4ece\u5ba2\u6237\u7aef\u7684\u6570\u636e\u4ea4\u4e92\u51fd\u6570str_cli\u4e2d\u53ef\u4ee5\u770b\u51fa\u5ba2\u6237\u7aef\u8fdb\u884c\u7684\u64cd\u4f5c\u5982\u4e0b\uff1a<\/p>\n<p>1.\u5ba2\u6237\u7a0b\u5e8f\u901a\u8fc7fgets\u4ece\u6807\u51c6\u8f93\u5165\u6587\u4ef6\u8bfb\u5165\u6570\u636e\uff0c\u5e76\u901a\u8fc7write\u5c06\u6570\u636e\u53d1\u9001\u81f3\u670d\u52a1\u5668\u7aef\uff1b<\/p>\n<p>2.\u5ba2\u6237\u7a0b\u5e8f\u901a\u8fc7read\u51fd\u6570\u8bfb\u53d6\u670d\u52a1\u5668\u53d1\u6765\u7684\u6570\u636e\uff0c\u5e76\u901a\u8fc7fputs\u5c06\u6570\u636e\u5199\u5165\u6807\u51c6\u8f93\u51fa\u6587\u4ef6\uff1b<\/p>\n<p>3.\u5982\u679cfgets\u8bfb\u5165\u6570\u636e\u9519\u8bef\u65f6\uff0c\u6574\u4e2a\u5faa\u73af\u7ed3\u675f\uff0c\u5ba2\u6237\u7aef\u4e5f\u5c06\u7ed3\u675f\uff1b<\/p>\n<h4>3.\u670d\u52a1\u5668\u7a0b\u5e8f\u8bbe\u8ba1<\/h4>\n<p>\u5e76\u53d1\u670d\u52a1\u5668\u7684\u7ecf\u5178\u6a21\u578b\u5728\u672c\u535a\u5ba2\u4e4b\u524d\u7684\u6587\u7ae0\u4e2d\u6709\u6240\u63d0\u5230\uff0c\u8fd9\u91cc\u53ea\u662f\u7279\u522b\u8bf4\u660e\u670d\u52a1\u5668\u6570\u636e\u5904\u7406\u51fd\u6570\u3002<\/p>\n<pre class=\"brush:c\">void str_echo(int sockfd)\r\n{\r\n\tint n;\r\n\tchar buf[DATA_MAX];\r\n\r\nagain:\r\n\twhile((n = read(sockfd, buf, DATA_MAX)) &gt; 0)\r\n\t\tif (write(sockfd, buf, n) &lt; 0) {\r\n\t\t\tprintf(\"write error!\\n\");\r\n\t\t\texit(1);\r\n\t\t}\r\n\r\n\tif (n &lt; 0 &amp;&amp; errno == EINTR)\r\n\t\tgoto again;\r\n\telse if (n &lt; 0)\r\n\t\tprintf(\"str_echo error!\\n\");\r\n}<\/pre>\n<p>\u670d\u52a1\u5668\u7a0b\u5e8f\u5b8c\u6210\u7684\u5de5\u4f5c\u5982\u4e0b\uff1a<\/p>\n<p>1.\u901a\u8fc7read\u8bfb\u53d6\u5ba2\u6237\u7a0b\u5e8f\u53d1\u9001\u7684\u6570\u636e\uff1b<\/p>\n<p>2.\u901a\u8fc7write\u5c06\u521a\u521a\u8bfb\u5230\u7684\u6570\u636e\u91cd\u65b0\u53d1\u9001\u7ed9\u5ba2\u6237\u7a0b\u5e8f\uff1b<\/p>\n<p>3.\u5982\u679c\u5ba2\u6237\u7aef\u6b63\u5e38\u9000\u51fa\uff0c\u90a3\u4e48\u670d\u52a1\u5668\u7684read\u51fd\u6570\u5c06\u8fd4\u56de0\u5e76\u9000\u51fa\u5faa\u73af\uff1b\u5426\u5219\u5c06\u663e\u793a\u9519\u8bef\u4fe1\u606f\uff1b<\/p>\n<p>\u901a\u8fc7\u4e0a\u8ff0\u5bf9\u5ba2\u6237\u548c\u670d\u52a1\u5668\u7a0b\u5e8f\u7684\u63cf\u8ff0\uff0c\u6211\u4eec\u53ef\u4ee5\u5f97\u77e5\u8be5C\/S\u6a21\u578b\u7684\u5de5\u4f5c\u65b9\u5f0f\u662f\uff1a\u5ba2\u6237\u7a0b\u5e8f\u4ece\u6807\u51c6\u8f93\u5165\u8bfb\u5165\u7528\u6237\u8f93\u5165\u7684\u6570\u636e\uff0c\u5e76\u53d1\u9001\u81f3\u670d\u52a1\u5668\uff1b\u670d\u52a1\u5668\u4ece\u7f51\u7edc\u8f93\u5165\u8bfb\u5165\u8be5\u6570\u636e\uff0c\u7acb\u5373\u5c06\u8bfb\u5165\u7684\u6570\u636e\u53d1\u9001\u7ed9\u5ba2\u6237\u7a0b\u5e8f\uff1b\u5ba2\u6237\u4ece\u7f51\u7edc\u8f93\u5165\u8bfb\u53d6\u670d\u52a1\u5668\u53d1\u6765\u7684\u6570\u636e\uff0c\u5e76\u5c06\u5176\u663e\u793a\u5728\u6807\u51c6\u8f93\u51fa\u4e0a\u3002<\/p>\n<p>\u4e5f\u5c31\u662f\u8bf4\uff0c\u6bcf\u5f53\u7528\u6237\u5728\u5ba2\u6237\u7aef\u8f93\u5165\u6570\u636e\uff0c\u5ba2\u6237\u7aef\u5728\u7ec8\u7aef\u4e0a\u53c8\u4f1a\u7acb\u5373\u56de\u663e\u7528\u6237\u6240\u8f93\u5165\u7684\u6570\u636e\u3002\u56e0\u6b64\uff0c\u6211\u4eec\u5c06\u4e0a\u8ff0\u6240\u4e3e\u4f8b\u7684\u5177\u6709\u5e76\u53d1\u670d\u52a1\u5668\u7684C\/S\u6a21\u578b\u79f0\u4e4b\u4e3a\u56de\u5c04\u5ba2\u6237\/\u670d\u52a1\u5668\u7a0b\u5e8f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>TCP\u5ba2\u6237\/\u670d\u52a1\u5668\u7a0b\u5e8f\u8bbe\u8ba1\u6a21\u578b-\u5e76\u53d1\u670d\u52a1\u5668 \u4e0a\u6587\u4e2d\u6240\u8bf4\u7684\u8fed\u4ee3\u670d\u52a1\u5668\u7b80\u5355\u6613\u61c2\uff0c\u5c06\u5b83\u4f5c\u4e3a\u5b66\u4e60socket\u7f16\u7a0b\u7684\u4f8b\u5b50 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[208],"tags":[223,405],"class_list":["post-3117","post","type-post","status-publish","format-standard","hentry","category-208","tag-tcp","tag-405"],"views":7758,"_links":{"self":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts\/3117","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/comments?post=3117"}],"version-history":[{"count":0,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts\/3117\/revisions"}],"wp:attachment":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/media?parent=3117"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/categories?post=3117"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/tags?post=3117"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}