\u4e0b\u9762\u6211\u4eec\u6765\u8be6\u7ec6\u8bf4\u660e\u6709\u540d\u7ba1\u9053\u7684\u8bfb\u5199\u89c4\u5219\u3002<\/p>\n
3.\u6709\u540d\u7ba1\u9053\u8bfb\u53d6\u89c4\u5219<\/p>\n
(1)\u5982\u679c\u8fdb\u7a0bA\u4e8b\u5148\u5199\u6253\u5f00FIFO\uff0c\u4f46\u5374\u4e0d\u8fdb\u884c\u5199\u64cd\u4f5c\uff08FIFO\u4e2d\u4e3a\u7a7a\uff09\uff0c\u90a3\u4e48\u8fdb\u7a0bB\u5bf9\u5176\u8fdb\u884c\u8bfb\u64cd\u4f5c\u65f6\u5019\u5c06\u4f1a\u963b\u585e\uff0c\u6216\u8005\u76f4\u63a5\u8fd4\u56de-1(\u5f53\u8bbe\u7f6e\u4e86\u975e\u963b\u585e\u6807\u5fd7\u65f6)\u3002
\n\u6211\u4eec\u7ee7\u7eed\u4ee5\u300aLinuxC\u7f16\u7a0b\u5b9e\u6218\u300b\u4e00\u4e66\u4e2d\u7684\u4f8b\u5b50\uff08P252\uff09\u4e3a\u539f\u578b\uff0c\u5bf9procwrite.c\u51fd\u6570\u7a0d\u4f5c\u6539\u52a8\u5373\u53ef\uff0c\u5177\u4f53\u4ee3\u7801\u5982\u4e0b\u3002<\/p>\n
\tprintf(\"Now the writer will sleep 5s..\\n\");\r\n\tsleep(5);\r\n\tprintf(\"Now the writer wake up and will write to FIFO..\\n\");\r\n\twrite(fd,buf,strlen(buf)+1);\r\n\tprintf(\"writer will leave!\\n\");\r\n\tclose(fd);<\/pre>\n\u6211\u4eec\u53ef\u4ee5\u53d1\u73b0,procwrite\u8fdb\u7a0b\u8fd0\u884c\u540e\uff0c\u53d1\u751f\u4e86\u963b\u585e\uff0c\u8fd9\u4e00\u70b9\u53ef\u7528\u4e0a\u6587\u7684\u6253\u5f00\u89c4\u5219\u6765\u89e3\u91ca\u3002\u5f53\u5728\u53e6\u4e00\u4e2a\u7ec8\u7aef\u8fd0\u884cprocread\u8fdb\u7a0b\u540e\uff0c\u6b64\u65f6\u7684procwrite\u6b63\u5e38\u8fd0\u884c\u3002\u7531\u4e8e\u6211\u4eec\u8ba9procwrite\u8fdb\u7a0b\u7761\u77205s\uff0c\u6240\u4ee5\u5f53\u524d\u7ba1\u9053\u7f13\u51b2\u533a\u662f\u7a7a\u7684\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u53e6\u4e00\u7ec8\u7aef\u53d1\u73b0procread\u8fdb\u7a0b\u53d1\u751f\u4e86\u963b\u585e\u3002\u4f46\u5f53procwrite\u7761\u7720\u7ed3\u675f\uff0c\u7ee7\u7eed\u8fd0\u884c\u65f6\uff0cprocread\u8fdb\u7a0b\u53ef\u6b63\u786e\u8bfb\u51fa\u7ba1\u9053\u5185\u6570\u636e\u3002<\/p>\n
\u5982\u679c\u4f60\u7406\u89e3\u4e86\u89c4\u52191\uff0c\u90a3\u4e48\u6211\u4eec\u7ee7\u7eed\u6765\u4e86\u89e3\u4e24\u79cd\u8bfb\u64cd\u4f5c\u963b\u585e\u7684\u60c5\u51b5\u3002<\/p>\n
(2)\u5f53FIFO\u4e2d\u6709\u6570\u636e\u65f6\uff0c\u4f46\u662f\u6b63\u5728\u88ab\u8fdb\u7a0bA\u6240\u8bfb\u53d6\uff0c\u5982\u679cB\u8fdb\u7a0b\u6b64\u65f6\u4e5f\u6b32\u8bfbFIFO\uff0cB\u8fdb\u7a0b\u5c06\u963b\u585e\uff1b\u5982\u679cFIFO\u4e2d\u65e0\u6570\u636e\uff0c\u90a3\u4e48\u8bfb\u8fdb\u7a0b\u4e5f\u5c06\u963b\u585e\uff08\u89c4\u52191\u6240\u8ff0\uff09\u3002\u60f3\u8981\u89e3\u9664\u963b\u585e\u53ea\u8981\u5728\u7ba1\u9053\u5185\u5199\u5165\u6570\u636e\u5373\u53ef\uff0c\u4e0d\u7ba1\u5199\u5165\u591a\u5c11\u6570\u636e\uff0c\u4e5f\u4e0d\u7ba1\u8bfb\u8fdb\u7a0b\u8bf7\u6c42\u8bfb\u591a\u5c11\u6570\u636e\u3002<\/p>\n
\u6211\u4eec\u7ee7\u7eed\u4ee5\u4e0a\u8ff0\u4f8b\u5b50\u4e3a\u539f\u578b\uff0c\u4f46\u662f\u9700\u8981\u4e24\u4e2a\u8bfb\u8fdb\u7a0b\u3002\u9996\u5148procwrite\u8fdb\u7a0b\u5148\u8fdb\u884c\u7b2c\u4e00\u6b21\u5199\uff0c\u7136\u540e\u7761\u772020s\uff0c\u63a5\u7740\u8fdb\u884c\u7b2c\u4e8c\u6b21\u5199\u64cd\u4f5c\uff0c\u8fd9\u662f\u4e3a\u4e86\u89e3\u9664\u56e0\u8bfb\u64cd\u4f5c\u800c\u963b\u585e\u7684\u8fdb\u7a0b\u3002<\/p>\n
\/\/procwrite.c\u90e8\u5206\u4ee3\u7801\r\n\tprintf(\"Now the writer will write data to FIFO..\\n\");\r\n\twrite(fd,buf,strlen(buf)+1);\r\n\tprintf(\"writer will leave!\\n\");\r\n\tsleep(20);\r\n\tstrcpy(buf,\"The write write another data now\");\r\n\twrite(fd,buf,strlen(buf)+1);\r\n\tclose(fd);\r\n\texit(0);<\/pre>\n\u5728procread.c\u7a0b\u5e8f\u4e2d\uff0c\u6211\u4eec\u8ba9\u6b64\u8fdb\u7a0b\u4e00\u6b21\u6027\u53ea\u8bfb\u53d6\u4e00\u4e2a\u5b57\u7b26\u3002<\/p>\n
int n=20;\r\nwhile(n--)\ufeff\r\n{\r\nread(fd,buf,1);\r\nbuf[strlen(buf)]='\\0';\r\nprintf(\"Read content:%s\\n\",buf);\r\nsleep(2);\r\n}\r\nclose(fd);\r\nunlink(FIFO_NAME);\r\nexit(0);<\/pre>\n\u5728procread2.c\u7a0b\u5e8f\u4e2d\uff0c\u6211\u4eec\u8ba9\u6b64\u8fdb\u7a0b\u4e00\u6b21\u6027\u8bfb\u5b8c\u7ba1\u9053\u5185\u6240\u6709\u6570\u636e\u3002<\/p>\n
printf(\"I will read data from FIFO..\\n\");\r\nread(fd,buf,BUF_SIZE);\r\nprintf(\"Read content:%s\\n\",buf);\r\nclose(fd);\r\nexit(0);<\/pre>\n\u6211\u4eec\u9996\u5148\u8fd0\u884cprocwrite\uff0c\u7136\u540e\u7acb\u9a6c\u8fd0\u884cprocread\uff0c\u53ef\u4ee5\u770b\u5230\u5176\u6bcf\u6b21\u53ea\u8f93\u51fa\u4e00\u4e2a\u5b57\u7b26\uff1b\u63a5\u7740\u6211\u4eec\u8fd0\u884cprocread2\uff0c\u53ef\u4ee5\u770b\u5230\u8fd9\u4e2a\u8fdb\u7a0b\u4e00\u6b21\u6027\u8bfb\u5b8c\u4e86\u7ba1\u9053\u5185\u5269\u4f59\u7684\u6240\u6709\u6570\u636e\uff0c\u800c\u6b64\u65f6\u518d\u770b\u8fd0\u884cprocread\u7684\u90a3\u4e2a\u7ec8\u7aef\uff0c\u53ef\u77e5procread\u8fdb\u7a0b\u53d1\u751f\u4e86\u963b\u585e\uff0c\u4e0d\u8fc7\u518d\u7a0d\u7b49\u7247\u523b\uff0c\u53ef\u53d1\u73b0\u5b83\u6709\u63a5\u7740\u8f93\u51fa\u5b57\u7b26\uff0c\u8fd9\u662f\u56e0\u4e3aprocwrite\u8fdb\u7a0b\u7b2c\u4e8c\u6b21\u7684\u5199\u64cd\u4f5c\u89e3\u9664\u4e86procread\u8fdb\u7a0b\u7684\u963b\u585e\u3002<\/p>\n
\u8fd9\u91cc\u53ea\u662f\u4e3a\u5927\u5bb6\u505a\u4e00\u4e2a\u7b80\u5355\u7684\u6f14\u793a\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u7406\u89e3\u4e0a\u8ff0\u89c4\u5219\u7684\u57fa\u7840\u4e0a\u7f16\u5199\u5176\u4ed6\u7a0b\u5e8f\u53bb\u9a8c\u8bc1\u3002<\/p>\n
4.\u6709\u540d\u7ba1\u9053\u7684\u5199\u89c4\u5219<\/p>\n
\u5982\u679c\u6253\u5f00FIFO\u65f6\uff0c\u6ca1\u6709\u52a0\u975e\u963b\u585e\u6807\u5fd7\uff0c\u90a3\u4e48\u5199\u64cd\u4f5c\u9075\u5faa\u4ee5\u4e0b\u7684\u89c4\u5219\uff1a<\/p>\n
(1)\u5982\u679c\u5199\u5165\u6570\u636e\u7684\u5b57\u8282\u6570\u4e0d\u5927\u4e8ePIPE_BUF\uff08\u6ce8\u610f\uff0c\u4ece\u5185\u68382.6.11\u5f00\u59cb\uff0c\u5176\u503c\u4e3a65536\uff09\uff0cLinux\u5c06\u4fdd\u8bc1\u5199\u64cd\u4f5c\u7684\u539f\u5b50\u6027\u3002\u5f53\u7ba1\u9053\u5185\u7684\u5269\u4f59\u7f13\u51b2\u533a\u5927\u4e8e\u8981\u5199\u5165\u7684\u6570\u636e\u5b57\u8282\u6570\u65f6\uff0c\u90a3\u4e48\u5c06\u4e00\u6b21\u6027\u5199\u5b8c\u6570\u636e\uff1b\u5426\u5219\uff0c\u8fdb\u7a0b\u8fdb\u5165\u7761\u7720\u72b6\u6001\uff0c\u76f4\u81f3\u7ba1\u9053\u5185\u7684\u7f13\u51b2\u533a\u53ef\u4ee5\u5bb9\u7eb3\u8981\u5199\u5165\u7684\u6570\u636e\u4e3a\u6b62\u3002<\/p>\n
(2)\u5982\u679c\u5199\u5165\u7684\u6570\u636e\u5b57\u8282\u6570\u4e0d\u5927\u4e8ePIPE_BUF\uff0c\u90a3\u4e48Linux\u5c06\u4e0d\u4fdd\u8bc1\u5199\u64cd\u4f5c\u7684\u539f\u5b50\u6027\u3002\u7ba1\u9053\u5185\u4e00\u6709\u7a7a\u95f2\u7684\u7f13\u51b2\u533a\uff0c\u5199\u8fdb\u7a0b\u5c31\u53bb\u5199\u6570\u636e\uff0c\u76f4\u81f3\u6240\u6709\u6570\u636e\u90fd\u88ab\u5199\u5b8c\u4e3a\u6b62\u3002<\/p>\n
\u5982\u679c\u6253\u5f00FIFO\u7684\u65f6\u5019\u52a0\u5165\u4e86\u963b\u585e\u6807\u5fd7\uff0c\u90a3\u4e48\u5199\u64cd\u4f5c\u9075\u5faa\u4e00\u4e0b\u89c4\u5219\uff1a<\/p>\n
(1)\u5982\u679c\u8981\u5199\u5165\u6570\u636e\u7684\u5b57\u8282\u6570\u5927\u4e8ePIPE_BUF\uff0c\u90a3\u4e48linux\u5c06\u4e0d\u4f1a\u4fdd\u8bc1\u5199\u5165\u7684\u539f\u5b50\u6027\u3002\u5728\u5199\u6ee1\u6240\u6709FIFO\u7a7a\u95f2\u7f13\u51b2\u533a\u540e\uff0c\u5199\u64cd\u4f5c\u8fd4\u56de\u3002<\/p>\n
(2)\u5982\u679c\u8981\u5199\u5165\u7684\u6570\u636e\u7684\u5b57\u8282\u6570\u4e0d\u5927\u4e8ePIPE_BUF\uff0c\u90a3\u4e48linux\u5c06\u4fdd\u8bc1\u5199\u5165\u7684\u539f\u5b50\u6027\u3002\u5982\u679c\u5f53\u524dFIFO\u7a7a\u95f2\u7f13\u51b2\u533a\u80fd\u591f\u5bb9\u7eb3\u8bf7\u6c42\u5199\u5165\u7684\u5b57\u8282\u6570\uff0c\u5199\u5b8c\u540e\u6210\u529f\u8fd4\u56de\uff1b\u5982\u679c\u5f53\u524dFIFO\u7a7a\u95f2\u7f13\u51b2\u4e0d\u80fd\u591f\u5bb9\u7eb3\u8bf7\u6c42\u5199\u5165\u7684\u5b57\u8282\u6570\uff0c\u5219\u8fd4\u56deEAGAIN\u9519\u8bef\uff0c\u63d0\u9192\u4ee5\u540e\u518d\u5199\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e0b\u9762\u6211\u4eec\u6765\u8be6\u7ec6\u8bf4\u660e\u6709\u540d\u7ba1\u9053\u7684\u8bfb\u5199\u89c4\u5219\u3002 3.\u6709\u540d\u7ba1\u9053\u8bfb\u53d6\u89c4\u5219 (1)\u5982\u679c\u8fdb\u7a0bA\u4e8b\u5148\u5199\u6253\u5f00FIFO\uff0c\u4f46\u5374\u4e0d\u8fdb\u884c\u5199 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[140],"tags":[139,108,141,138,402],"class_list":["post-1186","post","type-post","status-publish","format-standard","hentry","category-140","tag-ipc","tag-linux","tag-141","tag-138","tag-402"],"views":9537,"_links":{"self":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts\/1186","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=1186"}],"version-history":[{"count":0,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts\/1186\/revisions"}],"wp:attachment":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/media?parent=1186"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/categories?post=1186"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/tags?post=1186"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}