{"id":177,"date":"2016-04-23T18:43:50","date_gmt":"2016-04-23T18:43:50","guid":{"rendered":""},"modified":"2016-04-23T18:43:50","modified_gmt":"2016-04-23T18:43:50","slug":"","status":"publish","type":"post","link":"http:\/\/weizn.net\/?p=177","title":{"rendered":"Linux\u4e2d\u7684PIPE_SIZE\u4e0ePIPE_BUF\uff0c\u7ba1\u9053\u6700\u5927\u5199\u5165\u503c\u95ee\u9898"},"content":{"rendered":"

\n\t    \u7b80\u5355\u6765\u8bf4\uff0c\u5728Linux\u4e0b\uff0cpipe\u7684PIPE_BUF\u957f\u5ea6\u9650\u5236\u4e86\u5b83\u5728\u539f\u5b50\u64cd\u4f5c\u4e2d\u4e00\u6b21\u5199\u5165\u7684\u5927\u5c0f\uff0c\u4e3a4096\u5b57\u8282\u3002\u800c<\/span>PIPE_SIZE\u5219\u9650\u5236\u4e86pipe\u7f13\u51b2\u533a\u7684\u6700\u5927\u957f\u5ea6\uff0c\u4e3a64K=65536\u5b57\u8282\u3002<\/span>\u5728\u4f7f\u7528write()\u5411pipe\u4e2d\u5199\u5165\u6570\u636e\u65f6\uff0c\u82e5\u5199\u5165\u957f\u5ea6\u5c0f\u4e8e4096\u5b57\u8282\uff0c\u5219\u6b64\u6b21\u5199\u5165\u52a8\u4f5c\u4e3a\u539f\u5b50\u64cd\u4f5c\uff0c\u5426\u5219\u4f1a\u5206\u6279\u5199\u5165\u3002\u82e5write()\u7684\u5b57\u8282\u6570\u5927\u4e8e\u4e86pipe\u4e2d\u7a7a\u95f2\u7a7a\u95f4\u5927\u5c0f\uff0c\u5219write()\u4f1a\u88ab\u963b\u585e\uff0c\u76f4\u5230pipe\u4e2d\u7684\u6570\u636e\u88ab\u8bfb\u53d6\u51fa\u53bb\u3002\u5f53\u7136\u4e5f\u53ef\u4ee5\u8bbe\u7f6e\u4e3a\u975e\u963b\u585e\u6a21\u5f0f\uff0c\u6b64\u65f6write()\u5219\u4f1a\u8fd4\u56de-1\uff0cerrno\u88ab\u7f6e\u4e3a<\/span>EAGAIN\u9519\u8bef\u3002\u4ee5\u4e0b\u662f\u8f6c\u8f7d\u7684\u4e00\u7bc7\u3002<\/span>\n<\/p>\n

\n\t\n<\/p>\n

\n\t\n<\/p>\n

\n\t\u73b0\u5728\u5f00\u53d1\u7684\u9879\u76ee\u662f\u4ecesolaris\u5230linux\u7684\u5e94\u7528\u79fb\u690d\u3002\u7ecf\u5e38\u7528\u5230popen\u51fd\u6570\uff0c\u4f7f\u75288192\u5b57\u8282\u7684\u6570\u7ec4\u8bfb\u53d6popen\u8f93\u51fa\uff0c\u4f46\u6ca1\u6709\u8fdb\u884c\u6ea2\u51fa\u5224\u65ad\u3002\n<\/p>\n

\n\t\u521a\u5f00\u59cb\u8ba4\u4e3a\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u5185\u5b58\u8d8a\u754c\uff0c\u4f46\u5bf9popen\u548cPIPE\u8c03\u67e5\u4ee5\u540e\uff0c\u7591\u60d1\u8d8a\u6765\u8d8a\u591a\u4e86\u3002\n<\/p>\n

\n\t1\uff09\u95ee\u9898\u7684\u5f15\u51fa\n<\/p>\n

\n\tpopen\u4f7f\u7528\u7ba1\u9053\u6765\u8bb0\u5f55\u88ab\u8c03\u7528\u547d\u4ee4\u7684\u8f93\u51fa\uff0c\u90a3\u4e48popen\u7684\u6700\u5927\u5199\u5165\u5b57\u8282\u6570\u5fc5\u7136\u662f\u7ba1\u9053\u7684\u6700\u5927\u503c\u3002\n<\/p>\n

\n\t\u4f7f\u7528linux\u7684ulimit -a\u6765\u67e5\u770b\u7cfb\u7edf\u9650\u5236\uff1a\n<\/p>\n

\n
    \n
  1. \n\t\t\t[syscom@sysbase0-0 linux]$ ulimit -a  \n\t\t<\/li>\n
  2. \n\t\t\tcore file size          (blocks, -c) 0  \n\t\t<\/li>\n
  3. \n\t\t\tdata seg size           (kbytes, -d) unlimited  \n\t\t<\/li>\n
  4. \n\t\t\tscheduling priority             (-e) 0  \n\t\t<\/li>\n
  5. \n\t\t\tfile size               (blocks, -f) unlimited  \n\t\t<\/li>\n
  6. \n\t\t\tpending signals                 (-i) 16204  \n\t\t<\/li>\n
  7. \n\t\t\tmax locked memory       (kbytes, -l) 64  \n\t\t<\/li>\n
  8. \n\t\t\tmax memory size         (kbytes, -m) unlimited  \n\t\t<\/li>\n
  9. \n\t\t\topen files                      (-n) 1024  \n\t\t<\/li>\n
  10. \n\t\t\tpipe size            (512 bytes, -p) 8  \n\t\t<\/li>\n
  11. \n\t\t\tPOSIX message queues     (bytes, -q) 819200  \n\t\t<\/li>\n
  12. \n\t\t\treal-time priority              (-r) 0  \n\t\t<\/li>\n
  13. \n\t\t\tstack size              (kbytes, -s) 8192  \n\t\t<\/li>\n
  14. \n\t\t\tcpu time               (seconds, -t) unlimited  \n\t\t<\/li>\n
  15. \n\t\t\tmax user processes              (-u) 1024  \n\t\t<\/li>\n
  16. \n\t\t\tvirtual memory          (kbytes, -v) unlimited  \n\t\t<\/li>\n
  17. \n\t\t\tfile locks                      (-x) unlimited  \n\t\t<\/li>\n<\/ol>\n<\/div>\n

    \n\t\u67e5\u770bsolaris\u7684\u7cfb\u7edf\u9650\u5236\uff1a\n<\/p>\n

    \n
      \n
    1. \n\t\t\tbash-3.00$ ulimit -a  \n\t\t<\/li>\n
    2. \n\t\t\tcore file size        (blocks, -c) unlimited  \n\t\t<\/li>\n
    3. \n\t\t\tdata seg size         (kbytes, -d) unlimited  \n\t\t<\/li>\n
    4. \n\t\t\tfile size             (blocks, -f) unlimited  \n\t\t<\/li>\n
    5. \n\t\t\topen files                    (-n) 256  \n\t\t<\/li>\n
    6. \n\t\t\tpipe size          (512 bytes, -p) 10  \n\t\t<\/li>\n
    7. \n\t\t\tstack size            (kbytes, -s) 8192  \n\t\t<\/li>\n
    8. \n\t\t\tcpu time             (seconds, -t) unlimited  \n\t\t<\/li>\n
    9. \n\t\t\tmax user processes            (-u) 29995  \n\t\t<\/li>\n
    10. \n\t\t\tvirtual memory        (kbytes, -v) unlimited  \n\t\t<\/li>\n<\/ol>\n<\/div>\n

      \u53ef\u4ee5\u770b\u5230\u5728linux\u7cfb\u7edf\u4e0apipe size \u4e3a512bytes * 8= 4096bytes\u3002solaris\u7cfb\u7edf\u4e0apipe size\u4e3a512bytes * 10= 5120bytes\u3002
      <\/p>\n

      \n\t\u65e0\u8bba\u662f4096\u8fd8\u662f5120\u90fd\u662f\u8fdc\u8fdc\u5c0f\u4e8e8912\u7684\u3002\u56e0\u6b64\u4f7f\u75288912\u5b57\u8282\u7684buf\u6765\u8bfb\u53d6popen\u7684\u8f93\u51fa\u65f6\u7edd\u5bf9\u4e0d\u4f1a\u51fa\u73b0\u5185\u5b58\u8d8a\u754c\u95ee\u9898\u4e86\u3002\n<\/p>\n

      \n\t\n<\/p>\n

      \n\t2\uff09\u95ee\u9898\u7684\u6df1\u5165\n<\/p>\n

      \n\t\u901a\u8fc7ulimit\u770b\u4f3c\u5f97\u5230\u4e86\u6b63\u786e\u7684\u7ed3\u679c\uff0c\u4f46\u5728\u5b9e\u9645\u6d4b\u8bd5\u4e2d\u5374\u8ba9\u4eba\u5927\u8dcc\u773c\u955c\uff01\n<\/p>\n

      \n\t\u6d4b\u8bd5\u7a0b\u5e8f\uff1a\n<\/p>\n

      \n\ttest_popen.c\n<\/p>\n

      \n
        \n
      1. \n\t\t\t#include<stdio.h>  \n\t\t<\/li>\n
      2. \n\t\t\tint main()  \n\t\t<\/li>\n
      3. \n\t\t\t{  \n\t\t<\/li>\n
      4. \n\t\t\t    FILE        *fp;  \n\t\t<\/li>\n
      5. \n\t\t\t    int i;  \n\t\t<\/li>\n
      6. \n\t\t\t    char        *p;  \n\t\t<\/li>\n
      7. \n\t\t\t    char        buf[128];  \n\t\t<\/li>\n
      8. \n\t\t\t    fp = popen(“.\/test_print”, “r”);  \n\t\t<\/li>\n
      9. \n\t\t\t    if(fp ==NULL) {  \n\t\t<\/li>\n
      10. \n\t\t\t        printf(“NG\\n”);  \n\t\t<\/li>\n
      11. \n\t\t\t        return -1;  \n\t\t<\/li>\n
      12. \n\t\t\t    }  \n\t\t<\/li>\n
      13. \n\t\t\t    fgets(buf, 128, fp);  \n\t\t<\/li>\n
      14. \n\t\t\t    pclose(fp);  \n\t\t<\/li>\n
      15. \n\t\t\t    return 0;  \n\t\t<\/li>\n
      16. \n\t\t\t}  \n\t\t<\/li>\n<\/ol>\n<\/div>\n

        test_print.c<\/p>\n

        \n
          \n
        1. \n\t\t\t#include <stdio.h>  \n\t\t<\/li>\n
        2. \n\t\t\tint main()  \n\t\t<\/li>\n
        3. \n\t\t\t{  \n\t\t<\/li>\n
        4. \n\t\t\t    unsigned int i;  \n\t\t<\/li>\n
        5. \n\t\t\t    for(i=0; i<0xffffffff;i++)  \n\t\t<\/li>\n
        6. \n\t\t\t        printf(“a”);  \n\t\t<\/li>\n
        7. \n\t\t\t    return 0;  \n\t\t<\/li>\n
        8. \n\t\t\t}  \n\t\t<\/li>\n<\/ol>\n<\/div>\n



          \n\u5c06test_popen.c \u548ctest_print.c\u5206\u522b\u7f16\u8bd1\u4e3atest_popen\u548ctest_print\uff0c\u8fd0\u884ctest_popen\uff0c\u7a0b\u5e8f\u7adf\u7136\u6b63\u5e38\u8fd0\u884c\uff01test_print\u660e\u660e\u8f93\u51fa\u4e864G\u7684\u5b57\u7b26\u554a<\/p>\n

          \n\t\n<\/p>\n

          \n\t3\uff09\u63a2\u7a76\u539f\u7406\u3002\n<\/p>\n

          \n\t\u901a\u8fc7man 7 pipe\u6765\u7406\u89e3PIPE\uff08\u6211\u7684man\u7248\u672c\u662f1.6f\uff09\n<\/p>\n

          \n
            \n
          1. \n\t\t\tPIPE_BUF  \n\t\t<\/li>\n
          2. \n\t\t\t      POSIX.1-2001 says that write(2)s of less than PIPE_BUF  bytes  must  be  \n\t\t<\/li>\n
          3. \n\t\t\t      atomic:  the  output  data  is  written  to  the  pipe  as a contiguous  \n\t\t<\/li>\n
          4. \n\t\t\t      sequence.  Writes of more than PIPE_BUF bytes may  be  non-atomic:  the  \n\t\t<\/li>\n
          5. \n\t\t\t      kernel  may  interleave  the data with data written by other processes.  \n\t\t<\/li>\n
          6. \n\t\t\t      POSIX.1-2001 requires PIPE_BUF to be at least 512  bytes.   (On  Linux,  \n\t\t<\/li>\n
          7. \n\t\t\t      PIPE_BUF  is  4096 bytes.)  The precise semantics depend on whether the  \n\t\t<\/li>\n
          8. \n\t\t\t      file descriptor is non-blocking (O_NONBLOCK), whether there are  multi-  \n\t\t<\/li>\n
          9. \n\t\t\t      ple writers to the pipe, and on n, the number of bytes to be written:  \n\t\t<\/li>\n<\/ol>\n<\/div>\n



            \nPIPE_BUF\u786e\u5b9e\u4e3a4096\uff0c\u4f46PIPE_BUF\u662f\u6307\u539f\u5b50\u5199\u7684\u6700\u5927\u503c\uff0c4kb\u521a\u597d\u662f1page size\uff0c\u5e76\u4e0d\u662f\u6307PIPE SIZE<\/p>\n

            \n\t\u5728\u8c37\u6b4c\u4e0a\u641c\u7d22\u5185\u6838\u6e90\u7801\uff0c\u57283.10\u7684\u5185\u6838\u4e2d\u6709\u5982\u4e0b\uff1a\n<\/p>\n

            \n\t\n<\/p>\n

            \n\t\n<\/p>\n

            \n\t133 \/* Differs from PIPE_BUF in that PIPE_SIZE is the length of the actual 
            \n134    memory allocation, whereas PIPE_BUF makes atomicity guarantees.  *\/  
            \n135 #define PIPE_SIZE               PAGE_SIZE  
            \n\u660e\u786e\u8bf4\u660e\u4e86PIPE_BUF\u548cPIPE_SIZE\u7684\u4e0d\u540c \u8fdb\u4e00\u6b65\u8c03\u67e5\uff0c\u53d1\u73b0\u57282.6.11\u4e4b\u524d\uff0cPIPE_SIZE\u4e3a4k\uff0c\u4e4b\u540e\u5185\u6838\u4e2dPIPE_SIZE\u4e3a64k\uff0c\u90a3\u4e3a\u4f55\u80fd\u5199\u5165\u591a\u8fbe4G\u7684\u5b57\u7b26\u5462\uff1f 
            \n\u8fd9\u65f6\u6211\u60f3\u5230\u4e86popen\u7684\u6e90\u7801\uff0c\u67e5\u770b\u4e86popen\u5728BSD\u7684\u5b9e\u73b0\uff0c\u9664\u4e86\u4f7f\u7528pipe\u51fd\u6570\u5916\uff0c\u4e0esystem\u8c03\u7528\u5e76\u65e0\u533a\u522b\u3002\n<\/p>\n

            \n\t\u70b9\u6211\u67e5\u770bpopen\u6e90\u4ee3\u7801<\/a>\n<\/p>\n

            4\uff09\u7ed3\u8bba<\/p>\n

            \n\t\u4f9d\u8d56linux\u7684pipe\u7279\u6027\u7684\u7a0b\u5e8f\u5e76\u4e0d\u662f\u597d\u7684\u8bbe\u8ba1\uff0c\u975e\u5e38\u5bb9\u6613\u51fa\u4e71\u5b50\uff08\u76ee\u524d\u8fd8\u672a\u53d1\u751f\uff09\uff0c\u6700\u597d\u8fd8\u662f\u8001\u8001\u5b9e\u5b9e\u5730\u505a\u5185\u5b58\u8d8a\u754c\u5224\u65ad\uff0c\u964d\u4f4e\u4e0e\u7cfb\u7edf\u7684\u8026\u5408\u6027\u3002\n<\/p>\n

            \n\t\n<\/p>\n

            \n\thttp:\/\/blog.csdn.net\/judwenwen2009\/article\/details\/44134415\n<\/p>\n

            \n\tby judwenwen2009<\/p>\n","protected":false},"excerpt":{"rendered":"

            \n\t\u73b0\u5728\u5f00\u53d1\u7684\u9879\u76ee\u662f\u4ecesolaris\u5230linux\u7684\u5e94\u7528\u79fb\u690d\u3002\u7ecf\u5e38\u7528\u5230popen\u51fd\u6570\uff0c\u4f7f\u75288192\u5b57\u8282\u7684\u6570\u7ec4\u8bfb\u53d6popen\u8f93\u51fa\uff0c\u4f46\u6ca1\u6709\u8fdb\u884c\u6ea2\u51fa\u5224\u65ad\u3002\n<\/p>\n

            \n\t\u521a\u5f00\u59cb\u8ba4\u4e3a\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u5185\u5b58\u8d8a\u754c\uff0c\u4f46\u5bf9popen\u548cPIPE\u8c03\u67e5\u4ee5\u540e\uff0c\u7591\u60d1\u8d8a\u6765\u8d8a\u591a\u4e86\u3002\n<\/p>\n

            \n\t1\uff09\u95ee\u9898\u7684\u5f15\u51fa\n<\/p>\n

            \n\tpopen\u4f7f\u7528\u7ba1\u9053\u6765\u8bb0\u5f55\u88ab\u8c03\u7528\u547d\u4ee4\u7684\u8f93\u51fa\uff0c\u90a3\u4e48popen\u7684\u6700\u5927\u5199\u5165\u5b57\u8282\u6570\u5fc5\u7136\u662f\u7ba1\u9053\u7684\u6700\u5927\u503c\u3002\n<\/p>\n

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