{"id":1144,"date":"2010-08-19T10:52:48","date_gmt":"2010-08-19T02:52:48","guid":{"rendered":"http:\/\/edsionte.com\/techblog\/?p=1144"},"modified":"2010-09-24T13:47:38","modified_gmt":"2010-09-24T05:47:38","slug":"ipc-under-linux-pipe","status":"publish","type":"post","link":"http:\/\/edsionte.com\/techblog\/archives\/1144","title":{"rendered":"IPC under Linux-Pipe"},"content":{"rendered":"<p>\u7ba1\u9053\u662f\u4e00\u79cd\u6700\u57fa\u672c\u7684IPC\u65b9\u5f0f\uff0c\u672c\u6587\u4ee5\u7b14\u8bb0\u5f62\u5f0f\u4ee5\u53ca\u5178\u578b\u7a0b\u5e8f\u6765\u63cf\u8ff0\u7ba1\u9053\u7684\u7279\u70b9\u3002<\/p>\n<p>1.\u7ba1\u9053\u7279\u70b9\u5173\u952e\u5b57<\/p>\n<ul>\n<li>\u534a\u53cc\u5de5\u901a\u4fe1<\/li>\n<li>\u4eb2\u7f18\u8fdb\u7a0b\u95f4\u901a\u4fe1<\/li>\n<li>\u5185\u5b58\u4e2d\u7684\u7279\u6b8a\u6587\u4ef6<\/li>\n<li>\u5728\u672b\u5c3e\u5199\u6570\u636e\uff0c\u5728\u5934\u90e8\u8bfb\u6570\u636e<\/li>\n<\/ul>\n<p>2.\u7ba1\u9053\u521b\u5efa<\/p>\n<p>\u5148\u521b\u5efa\u7ba1\u9053\uff0c\u518d\u521b\u5efa\u8fdb\u7a0b\u3002\u5373\u5148pipe\uff0c\u518dfork\u3002<\/p>\n<p>3.\u4ece\u7ba1\u9053\u4e2d\u8bfb\u6570\u636e<\/p>\n<ul>\n<li>\u7ba1\u9053\u7684\u5199\u7aef\u4e0d\u5b58\u5728\uff0c\u90a3\u4e48\u8fdb\u7a0b\u8ba4\u4e3a\u5df2\u7ecf\u8bfb\u5230\u4e86\u6570\u636e\u7684\u672b\u5c3e\uff0c\u8bfb\u51fd\u6570\u8fd4\u56de\u7684\u5b57\u8282\u6570\u4e3a0\u3002<\/li>\n<li>\u8fd9\u91cc\u6709\u4e09\u4e2a\u540d\u8bcd\uff1aPIPE_BUF\uff0c\u8bf7\u6c42\u8bfb\u53d6\u5b57\u8282\u6570\uff08request_num\uff09,\u7ba1\u9053\u4e2d\u6570\u636e\u91cf\uff08pipe_num\uff09;\u90a3\u4e48\u5173\u4e8e\u8fd9\u4e09\u4e2a\u91cf\u4e4b\u95f4\u7684\u5173\u7cfb\u5982\u4e0b\u56fe\u3002<\/li>\n<\/ul>\n<p>\u4e0b\u9762\u8fd9\u4e2a\u7a0b\u5e8f\u53ef\u4ee5\u52a0\u6df1\u4f60\u5bf9\u4e0a\u8ff0\u8bfb\u89c4\u5219\u7684\u7406\u89e3\uff0c\u5b9e\u73b0\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre class=\"brush:c\">int main()\r\n{\r\n\tint fd[2];\r\n\tint ret,request;\r\n\tchar rbuf[4096];\r\n\tchar wbuf[5000];\r\n\tchar *msg=\"hello,pipe!\",*msg2=\"hello,I come here ,too!\";\r\n\tpid_t pid;\r\n\tint stat_val;\r\n\r\n\tif(pipe(fd)\\&lt;\\0)\r\n\t{\r\n\t\tprintf(\"pipe error\\n\");\r\n\t\texit(1);\r\n\t}\r\n\r\n\tif((pid=fork())==0)\r\n\t{\r\n\t\t\/\/child process write\r\n\t\tclose(fd[0]);\r\n\t\tret=write(fd[1],msg,strlen(msg)+1);\r\n\t\tprintf(\"I am writer and I write %d Byte data\\n\",ret);\r\n          \tsleep(5);\r\n\t\tret=write(fd[1],msg2,strlen(msg2)+1);\r\n\t\tprintf(\"I am writer and I write %d Byte data\\n\",ret);\r\n\t\tsleep(5);\r\n\t\tclose(fd[1]);\r\n\t\texit(0);\r\n\t}\r\n\telse if(pid\\&gt;\\0)\r\n\t{\r\n\t\t\/\/parent process read\r\n\t\tclose(fd[1]);\r\n\t\trequest=5000;\r\n\t\tret=read(fd[0],rbuf,request);\r\n\t\tprintf(\"when reader request %d Byte,the actual return Bytes is %d\\n\",request,ret);\r\n\t\trequest=10;\r\n\t\tret=read(fd[0],rbuf,request);\r\n\t\tprintf(\"when reader requesr %d Byte,the actual return Bytes is %d\\n\",request,ret);\r\n\t\trequest=100;\r\n\t\tret=read(fd[0],rbuf,request);\r\n\t\tprintf(\"when reader request %d Byte,the actual return Bytes is %d\\n\",request,ret);\r\n\t\trequest=1;\r\n\t\tret=read(fd[0],rbuf,request);\r\n\t\tprintf(\"when reader request %d Byte,the actual return Bytes is %d\\n\",request,ret);\r\n\t\tclose(fd[0]);\r\n\t\texit(0);\r\n\t}\r\n}<\/pre>\n<p>\u8be5\u7a0b\u5e8f\u4e2d\u7236\u8fdb\u7a0b\u8bfb\u6570\u636e\uff0c\u5b50\u8fdb\u7a0b\u53bb\u5199\u6570\u636e\u3002\u81f3\u4e8e\u8fd0\u884c\u8fc7\u7a0b\u8bf7\u4f60\u4eb2\u81ea\u53bb\u5c1d\u8bd5\uff0c\u56e0\u4e3a\u6211\u89c9\u5f97\u6211\u5728\u8fd9\u91cc\u8bf4\u7684\u591a\u4e48\u5177\u4f53\uff0c\u90fd\u4e0d\u53ca\u4f60\u4eb2\u81ea\u53bb\u611f\u53d7\u3002<\/p>\n<p>\u9996\u5148\u4f60\u53ef\u80fd\u4f1a\u60f3\uff1a\u662f\u5426\u5e94\u8be5\u5728\u7236\u8fdb\u7a0b\u6240\u8981\u6267\u884c\u7684\u4ee3\u7801\u524d\u52a0\u4e00\u4e2asleep(1)?\u56e0\u4e3a\u5728\u7236\u8fdb\u7a0b\u8bfb\u4e4b\u524d\uff0c\u7ba1\u9053\u5185\u81f3\u5c11\u5f97\u6709\u6570\u636e\u554a\uff01\u5176\u5b9e\u53ef\u4ee5\u4e0d\u7528\u52a0\u3002\u56e0\u4e3a\u5982\u679c\u7ba1\u9053\u5185\u65e0\u6570\u636e\u53ef\u8bfb\uff0c\u7236\u8fdb\u7a0b\u81ea\u52a8\u963b\u585e\uff0c\u76f4\u81f3\u6709\u6570\u636e\u6216\u8005\u4e0d\u5b58\u5728\u5199\u7aef\u65f6\u624d\u4f1a\u7ee7\u7eed\u8fd0\u884c\u3002<\/p>\n<p>\u5728\u5b50\u8fdb\u7a0b\u7b2c\u4e00\u6b21\u5199\u64cd\u4f5c\u540e\uff0c\u5c31\u7761\u77205\u79d2\uff0c\u6b64\u65f6\u7236\u8fdb\u7a0b\u521a\u597d\u8bfb\u5b8c\u7ba1\u9053\u5185\u7684\u6240\u6709\u6570\u636e\uff0c\u56e0\u4e3a\u8bf7\u6c42\u7684\u6570\u636e\u91cf\u4e3a5000\uff0c\u800cPIPE_BUF\u4e3a4960\u3002\u73b0\u5728\u7ba1\u9053\u5185\u5df2\u7ecf\u65e0\u6570\u636e\u53ef\u8bfb\u4e86\uff0c\u56e0\u6b64\u7236\u8fdb\u7a0b\u963b\u585e\u30025\u79d2\u8fc7\u540e\uff0c\u5b50\u8fdb\u7a0b\u7ee7\u7eed\u5199\u516524Byte\u3002\u7236\u8fdb\u7a0b\u7b2c\u4e8c\u6b21\u8bf7\u6c4210Byte\uff0c\u56e0\u6b64\u6839\u636e\u4e0a\u8ff0\u6211\u4eec\u6240\u8bf4\u7684\u8bfb\u89c4\u5219\uff0cread\u51fd\u6570\u8fd4\u56de10\u3002\u7236\u8fdb\u7a0b\u7b2c\u4e09\u6b21\u8bf7\u6c42\u8bfb100Byte\u7684\u6570\u636e\uff0c\u6839\u636e\u4e0a\u8ff0\u8bfb\u89c4\u5219\uff0c\u4ed6\u5c06\u8fd4\u56de\u7ba1\u9053\u5185\u6240\u6709\u6570\u636e\u7684\u5b57\u8282\u6570\uff0c\u56e0\u6b64read\u51fd\u6570\u8fd4\u56de14Byte\u3002<\/p>\n<p>\u7236\u8fdb\u7a0b\u7b2c\u56db\u6b21\u8bf7\u6c42\u8bfb\u524d\uff0c\u7ba1\u9053\u5df2\u7ecf\u7a7a\u4e86\uff0c\u6309\u7167\u6211\u4eec\u521a\u6240\u8bf4\u7684\uff0c\u7236\u8fdb\u7a0b\u73b0\u5728\u5e94\u8be5\u963b\u585e\u4e86\u3002\u56e0\u6b64\u5728\u5b50\u8fdb\u7a0b\u7761\u77205\u79d2\u540e\uff0c\u7236\u8fdb\u7a0b\u53d1\u73b0\u8bfb\u7aef\u5df2\u7ecf\u5173\u95ed\uff0c\u56e0\u6b64\u8bfb\u51fd\u6570\u8fd4\u56de0\u3002<\/p>\n<p>4.\u4ece\u7ba1\u9053\u4e2d\u5199\u6570\u636e<\/p>\n<ul>\n<li>\u53ea\u6709\u7ba1\u9053\u8bfb\u7aef\u5b58\u5728\u65f6\uff0c\u7ba1\u9053\u5199\u6570\u636e\u624d\u6709\u610f\u4e49\u3002<\/li>\n<li>\u5199\u6570\u636e\u65f6\uff0cLinux\u4e0d\u80fd\u4fdd\u8bc1\u5199\u5165\u7684\u539f\u5b50\u6027\u3002<\/li>\n<\/ul>\n<p>\u5173\u4e8e\u5199\u6570\u636e\u7684\u7b2c\u4e00\u6761\u89c4\u5219\uff0c\u5f88\u597d\u53bb\u9a8c\u8bc1\uff0c\u6bd4\u5982\u4e0a\u8ff0\u7a0b\u5e8f\uff0c\u5982\u679c\u5728\u7236\u8fdb\u7a0b\u4e00\u5f00\u59cb\u5c31\u5173\u95ed\u4e24\u4e2a\u7aef\uff0c\u90a3\u4e48\u5b50\u8fdb\u7a0b\u5c06\u4f1a\u81ea\u52a8\u9000\u51fa\u3002\u4f46\u662f\u5982\u679c\u5c06\u5b50\u8fdb\u7a0b\u7684\u8bfb\u7aef\u4e0d\u5173\u95ed\uff0c\u90a3\u4e48\u5b50\u8fdb\u7a0b\u662f\u53ef\u4ee5\u6b63\u5e38\u5199\u5165pipe\u7684\u3002\u56e0\u6b64\uff0c\u5728\u5199\u7ba1\u9053\u65f6\uff0c\u5e94\u8be5\u81f3\u5c11\u4fdd\u8bc1\u4e00\u4e2a\u8fdb\u7a0b\u7684\u7684\u8bfb\u7aef\u662f\u6253\u5f00\u7684\u3002<\/p>\n<p>\u5173\u4e8e\u5199\u6570\u636e\u7684\u975e\u539f\u5b50\u6027\u662f\u6307\uff0c\u5982\u679c\u8981\u5199\u5165A\u5b57\u8282\u7684\u6570\u636e\uff0c\u800c\u6b64\u65f6\u7ba1\u9053\u5185\u53ea\u6709B\u5b57\u8282\u7684\u7f13\u51b2\u533a\uff0c\u800c\u4e14A&gt;B\u3002\u90a3\u4e48\u6b64\u65f6\u5199\u7aef\u7684\u8fdb\u7a0b\u5c31\u4f1a\u5206\u6279\u5199\u5165\u6570\u636e\uff1a\u5148\u5199\u5165B\u5b57\u8282\uff0c\u7136\u540e\u518d\u5199\u5165(A-B)\u5b57\u8282\u3002\u7279\u6b8a\u7684\uff0c\u5f53A-B\u4ecd\u7136\u5927\u4e8ePIPE_BUF\u7684\u65f6\u5019\uff0c\u90a3\u4e48\u8fd8\u662f\u5148\u5199PIPE_BUF\u5b57\u8282\uff0c\u7136\u540e\u518d\u5199(A-B-PIPE_BUF)\u5b57\u8282\u7684\u6570\u636e\u3002\u5982\u679c\u5f53\u524d\u5728\u5199\u5165\u6700\u540e\u4e00\u6279\u6570\u636e\u524d\uff0c\u53ef\u4ee5\u4e00\u6b21\u6027\u5199\u5165\u7ba1\u9053\uff0c\u90a3\u4e48\u6b64\u65f6\u5199\u51fd\u6570\u5c06\u8fd4\u56de\u5199\u5165\u7684\u5b57\u8282\u6570\uff0c\u800c\u4e0d\u662f\u7b49\u6240\u6709\u6570\u636e\u90fd\u5199\u5b8c\u6bd5\u540e\u518d\u8fd4\u56de\u5199\u5165\u7684\u5b57\u8282\u6570\u3002<\/p>\n<p>\u4e0b\u9762\u8fd9\u4e2a\u7a0b\u5e8f\u8bf7\u52a1\u5fc5\u4eb2\u81ea\u52a8\u624b\u9a8c\u8bc1\u3002<\/p>\n<pre class=\"brush:c\">int main()\r\n{\r\n\tint fd[2];\r\n\tint ret,request;\r\n\tchar rbuf[50000];\r\n\tchar wbuf[65000];\r\n\tchar wbuf2[100000];\r\n\tchar *msg=\"hello,pipe!\",*msg2=\"hello,I come here ,too!\";\r\n\tpid_t pid;\r\n\tint stat_val;\r\n\r\n\tif(pipe(fd)\\&lt;\\0)\r\n\t{\r\n\t\tprintf(\"pipe error\\n\");\r\n\t\texit(1);\r\n\t}\r\n\r\n\tif((pid=fork())==0)\r\n\t{\r\n\t\t\/\/child process write\r\n\t\tclose(fd[0]);\r\n\t\tret=write(fd[1],wbuf,65000);\r\n\t\tprintf(\"I am writer and I write %d Byte data\\n\",ret);\r\n\t\tret=write(fd[1],wbuf2,100000);\r\n\t\tprintf(\"I am writer and I write %d Byte data\\n\",ret);\r\n\t\tprintf(\"writer has over\\n\");\r\n\t\tclose(fd[1]);\r\n\t\texit(0);\r\n\t}\r\n\telse if(pid\\&gt;\\0)\r\n\t{\r\n\t\t\/\/parent process read\r\n\/\/\t\tsleep(3);\r\n\t\tclose(fd[1]);\r\n\t\twhile(1)\r\n\t\t{\r\n\t\t\tsleep(1);\r\n\t\t\tret=read(fd[0],rbuf,10000);\r\n\t\t\tprintf(\"I am reader and the num of reading data is %d\\n\",ret);\r\n\t\t}\r\n\t\tclose(fd[0]);\r\n\t\texit(0);\r\n\t}\r\n}<\/pre>\n<p>\u5728\u7a0b\u5e8f\u8fd0\u884c\u540e\uff0c\u5f53\u7b2c\u4e03\u6b21\u663e\u793a\u5df2\u7ecf\u8bfb\u4e8610000\u5b57\u8282\u65f6\uff0c\u5c31\u8bf4\u660e\u4e86\u5199\u7ba1\u9053\u65f6\u7684\u975e\u539f\u5b50\u6027\u3002\u56e0\u4e3a\u5982\u679c\u5199\u662f\u539f\u5b50\u6027\u7684\uff0c\u5373\u4fbf\u5148\u5199\u5165\u768465000\u5b57\u8282\u88ab\u8bfb\u8d70\uff0c\u90a3\u4e48\u4e5f\u4e0d\u53ef\u80fd\u4e00\u6b21\u6027\u5168\u90e8\u5199\u5165100000\u5b57\u8282\uff08\u56e0\u4e3aPIPE_BUF\u4e3a65536\uff09\u3002\u5f53\u7b2c\u4e03\u6b21\u63d0\u793a\u5df2\u8bfb\u516510000\u5b57\u8282\u65f6\uff0c\u8bf4\u660e\u5148\u5c06\u4e00\u90e8\u5206\u6570\u636e\u5199\u5165\u4e86\u7ba1\u9053\u5185\u7684\u7a7a\u95f2\u533a\uff0c\u5426\u5219\u7b2c\u4e03\u6b21\u8bfb\u5165\u63d0\u793a\u53ea\u663e\u793a\u5df2\u8bfb\u51655000\u5b57\u8282\u3002  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