{"id":1102,"date":"2018-04-17T19:44:19","date_gmt":"2018-04-17T11:44:19","guid":{"rendered":"https:\/\/damogame.cn:15443\/wordpress\/?p=1102"},"modified":"2018-04-17T19:44:19","modified_gmt":"2018-04-17T11:44:19","slug":"fork-%e8%ae%a1%e7%ae%97%e6%9c%ba%e7%a8%8b%e5%ba%8f%e8%ae%be%e8%ae%a1%e4%b8%ad%e7%9a%84%e5%88%86%e5%8f%89%e5%87%bd%e6%95%b0","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/1102","title":{"rendered":"fork \u8ba1\u7b97\u673a\u7a0b\u5e8f\u8bbe\u8ba1\u4e2d\u7684\u5206\u53c9\u51fd\u6570"},"content":{"rendered":"
\n
\n

fork<\/h1>\n

\uff08\u51fd\u6570\uff09<\/h2>\n

\u7f16\u8f91<\/a><\/dd>\n<\/dl>\n

\n
\u8ba1\u7b97\u673a\u7a0b\u5e8f\u8bbe\u8ba1\u4e2d\u7684\u5206\u53c9\u51fd\u6570\u3002\u8fd4\u56de\u503c\uff1a \u82e5\u6210\u529f\u8c03\u7528\u4e00\u6b21\u5219\u8fd4\u56de\u4e24\u4e2a\u503c\uff0c\u5b50\u8fdb\u7a0b\u8fd4\u56de0\uff0c\u7236\u8fdb\u7a0b<\/a>\u8fd4\u56de\u5b50\u8fdb\u7a0b\u6807\u8bb0\uff1b\u5426\u5219\uff0c\u51fa\u9519\u8fd4\u56de-1\u3002<\/div>\n
fork\u51fd\u6570\u5c06\u8fd0\u884c\u7740\u7684\u7a0b\u5e8f\u5206\u62102\u4e2a\uff08\u51e0\u4e4e\uff09\u5b8c\u5168\u4e00\u6837\u7684\u8fdb\u7a0b\uff0c\u6bcf\u4e2a\u8fdb\u7a0b\u90fd\u542f\u52a8\u4e00\u4e2a\u4ece\u4ee3\u7801\u7684\u540c\u4e00\u4f4d\u7f6e\u5f00\u59cb\u6267\u884c\u7684\u7ebf\u7a0b\u3002\u8fd9\u4e24\u4e2a\u8fdb\u7a0b\u4e2d\u7684\u7ebf\u7a0b\u7ee7\u7eed\u6267\u884c\uff0c\u5c31\u50cf\u662f\u4e24\u4e2a\u7528\u6237\u540c\u65f6\u542f\u52a8\u4e86\u8be5\u5e94\u7528\u7a0b\u5e8f\u7684\u4e24\u4e2a\u526f\u672c\u3002<\/div>\n<\/div>\n
<\/div>\n
\n
\n
\u4e2d\u6587\u540d<\/dt>\n
fork<\/dd>\n
\u5916\u6587\u540d<\/dt>\n
fork<\/dd>\n<\/dl>\n
\n
\u7c7b\u00a0\u00a0\u00a0\u00a0\u578b<\/dt>\n
\u51fd\u6570<\/dd>\n
\u96b6\u00a0\u00a0\u00a0\u00a0\u5c5e<\/dt>\n
\u8ba1\u7b97\u673a<\/dd>\n<\/dl>\n<\/div>\n
\n
\n

\u76ee\u5f55<\/h2>\n
\n
    \n
  1. 1<\/span>\u00a0\u5206\u53c9\u51fd\u6570<\/a><\/span><\/li>\n
  2. \u25aa<\/span>\u00a0\u5934\u6587\u4ef6<\/a><\/span><\/li>\n
  3. \u25aa<\/span>\u00a0\u51fd\u6570\u539f\u578b<\/a><\/span><\/li>\n
  4. \u25aa<\/span>\u00a0\u51fd\u6570\u8bf4\u660e<\/a><\/span><\/li>\n
  5. 2<\/span>\u00a0\u4e2d\u6587\u7ffb\u8bd1<\/a><\/span><\/li>\n<\/ol>\n<\/div>\n<\/div>\n<\/div>\n
    <\/a><\/a><\/a><\/div>\n
    \n

    \u5206\u53c9\u51fd\u6570<\/h2>\n

    \u7f16\u8f91<\/a><\/div>\n

    <\/a><\/a><\/a><\/a><\/div>\n
    \n

    \u5934\u6587\u4ef6<\/h3>\n<\/div>\n
    \n
    \n\n\n\n
    \n
    1<\/div>\n
    2<\/div>\n<\/td>\n
    		\n
    \n
    #include<unistd.h>\/*#\u5305\u542b<unistd.h>*\/<\/code><\/div>\n
    #include<sys\/types.h>\/*#\u5305\u542b<sys\/types.h>*\/<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    <\/a><\/a><\/a><\/a><\/div>\n
    \n

    \u51fd\u6570\u539f\u578b<\/h3>\n<\/div>\n
    pid_t fork<\/i>(\u00a0void<\/b>);<\/div>\n
    \uff08pid_t \u662f\u4e00\u4e2a\u5b8f\u5b9a\u4e49<\/a>\uff0c\u5176\u5b9e\u8d28\u662fint \u88ab\u5b9a\u4e49\u5728#include<\/b><sys\/types.h<\/i>>\u4e2d\uff09<\/div>\n
    \u8fd4\u56de\u503c\uff1a \u82e5\u6210\u529f\u8c03\u7528\u4e00\u6b21\u5219\u8fd4\u56de\u4e24\u4e2a\u503c\uff0c\u5b50\u8fdb\u7a0b\u8fd4\u56de0\uff0c\u7236\u8fdb\u7a0b<\/a>\u8fd4\u56de\u5b50\u8fdb\u7a0bID\uff1b\u5426\u5219\uff0c\u51fa\u9519\u8fd4\u56de-1<\/div>\n
    <\/a><\/a><\/a><\/a><\/div>\n
    \n

    \u51fd\u6570\u8bf4\u660e<\/h3>\n<\/div>\n
    \u4e00\u4e2a\u73b0\u6709\u8fdb\u7a0b\u53ef\u4ee5\u8c03\u7528fork\u51fd\u6570\u521b\u5efa\u4e00\u4e2a\u65b0\u8fdb\u7a0b\u3002\u7531fork\u521b\u5efa\u7684\u65b0\u8fdb\u7a0b\u88ab\u79f0\u4e3a\u5b50\u8fdb\u7a0b\uff08child process\uff09\u3002fork\u51fd\u6570\u88ab\u8c03\u7528\u4e00\u6b21\u4f46\u8fd4\u56de\u4e24\u6b21\u3002\u4e24\u6b21\u8fd4\u56de\u7684\u552f\u4e00\u533a\u522b\u662f\u5b50\u8fdb\u7a0b\u4e2d\u8fd4\u56de0\u503c\u800c\u7236\u8fdb\u7a0b<\/a>\u4e2d\u8fd4\u56de\u5b50\u8fdb\u7a0bID\u3002<\/div>\n
    \u5b50\u8fdb\u7a0b\u662f\u7236\u8fdb\u7a0b\u7684\u526f\u672c\uff0c\u5b83\u5c06\u83b7\u5f97\u7236\u8fdb\u7a0b\u6570\u636e\u7a7a\u95f4\u3001\u5806\u3001\u6808\u7b49\u8d44\u6e90\u7684\u526f\u672c\u3002\u6ce8\u610f\uff0c\u5b50\u8fdb\u7a0b\u6301\u6709\u7684\u662f\u4e0a\u8ff0\u5b58\u50a8\u7a7a\u95f4\u7684\u201c\u526f\u672c\u201d\uff0c\u8fd9\u610f\u5473\u7740\u7236\u5b50\u8fdb\u7a0b\u95f4\u4e0d\u5171\u4eab\u8fd9\u4e9b\u5b58\u50a8\u7a7a\u95f4\u3002<\/div>\n
    UNIX\u5c06\u590d\u5236\u7236\u8fdb\u7a0b\u7684\u5730\u5740\u7a7a\u95f4<\/a>\u5185\u5bb9\u7ed9\u5b50\u8fdb\u7a0b\uff0c\u56e0\u6b64\uff0c\u5b50\u8fdb\u7a0b\u6709\u4e86\u72ec\u7acb\u7684\u5730\u5740\u7a7a\u95f4\u3002\u5728\u4e0d\u540c\u7684UNIX (Like)\u7cfb\u7edf\u4e0b\uff0c\u6211\u4eec\u65e0\u6cd5\u786e\u5b9afork\u4e4b\u540e\u662f\u5b50\u8fdb\u7a0b\u5148\u8fd0\u884c\u8fd8\u662f\u7236\u8fdb\u7a0b\u5148\u8fd0\u884c\uff0c\u8fd9\u4f9d\u8d56\u4e8e\u7cfb\u7edf\u7684\u5b9e\u73b0\u3002\u6240\u4ee5\u5728\u79fb\u690d\u4ee3\u7801\u7684\u65f6\u5019\u6211\u4eec\u4e0d\u5e94\u8be5\u5bf9\u6b64\u4f5c\u51fa\u4efb\u4f55\u7684\u5047\u8bbe\u3002<\/div>\n
    \u4e3a\u4ec0\u4e48fork\u4f1a\u8fd4\u56de\u4e24\u6b21\uff1f<\/b><\/div>\n
    \u7531\u4e8e\u5728\u590d\u5236\u65f6\u590d\u5236\u4e86\u7236\u8fdb\u7a0b<\/a>\u7684\u5806\u6808\u6bb5<\/a>\uff0c\u6240\u4ee5\u4e24\u4e2a\u8fdb\u7a0b\u90fd\u505c\u7559\u5728fork\u51fd\u6570\u4e2d\uff0c\u7b49\u5f85\u8fd4\u56de\u3002\u56e0\u6b64fork\u51fd\u6570\u4f1a\u8fd4\u56de\u4e24\u6b21\uff0c\u4e00\u6b21\u662f\u5728\u7236\u8fdb\u7a0b\u4e2d\u8fd4\u56de\uff0c\u53e6\u4e00\u6b21\u662f\u5728\u5b50\u8fdb\u7a0b\u4e2d\u8fd4\u56de\uff0c\u8fd9\u4e24\u6b21\u7684\u8fd4\u56de\u503c\u662f\u4e0d\u4e00\u6837\u7684\u3002\u8fc7\u7a0b\u5982\u4e0b\u56fe\u3002<\/div>\n
    \n
    \"\"<\/a><\/div>\n<\/div>\n
      \n
    1. \n
      fork\u8c03\u7528\u7684\u4e00\u4e2a\u5947\u5999\u4e4b\u5904\u5c31\u662f\u5b83\u4ec5\u4ec5\u88ab\u8c03\u7528\u4e00\u6b21\uff0c\u5374\u80fd\u591f\u8fd4\u56de\u4e24\u6b21\uff0c\u5b83\u53ef\u80fd\u6709\u4e09\u79cd\u4e0d\u540c\u7684\u8fd4\u56de\u503c\uff1a
      \n\u5728\u7236\u8fdb\u7a0b\u4e2d\uff0cfork\u8fd4\u56de\u65b0\u521b\u5efa\u5b50\u8fdb\u7a0b\u7684\u8fdb\u7a0bID\uff1b<\/div>\n<\/li>\n
    2. \n
      \u5728\u5b50\u8fdb\u7a0b\u4e2d\uff0cfork\u8fd4\u56de0\uff1b<\/div>\n<\/li>\n
    3. \n
      \u5982\u679c\u51fa\u73b0\u9519\u8bef\uff0cfork\u8fd4\u56de\u4e00\u4e2a\u8d1f\u503c<\/a>\u3002<\/div>\n<\/li>\n<\/ol>\n
      \u5728fork\u51fd\u6570\u6267\u884c\u5b8c\u6bd5\u540e\uff0c\u5982\u679c\u521b\u5efa\u65b0\u8fdb\u7a0b\u6210\u529f\uff0c\u5219\u51fa\u73b0\u4e24\u4e2a\u8fdb\u7a0b\uff0c\u4e00\u4e2a\u662f\u5b50\u8fdb\u7a0b\uff0c\u4e00\u4e2a\u662f\u7236\u8fdb\u7a0b\u3002\u5728\u5b50\u8fdb\u7a0b\u4e2d\uff0cfork\u51fd\u6570\u8fd4\u56de0\uff0c\u5728\u7236\u8fdb\u7a0b\u4e2d\uff0cfork\u8fd4\u56de\u65b0\u521b\u5efa\u5b50\u8fdb\u7a0b\u7684\u8fdb\u7a0bID\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7fork\u8fd4\u56de\u7684\u503c\u6765\u5224\u65ad\u5f53\u524d\u8fdb\u7a0b\u662f\u5b50\u8fdb\u7a0b\u8fd8\u662f\u7236\u8fdb\u7a0b\u3002<\/div>\n
      \u5f15\u7528\u4e00\u4f4d\u7f51\u53cb\u7684\u8bdd\u6765\u89e3\u91cafork\u51fd\u6570\u8fd4\u56de\u7684\u503c\u4e3a\u4ec0\u4e48\u5728\u7236\u5b50\u8fdb\u7a0b\u4e2d\u4e0d\u540c\u3002\u201c\u5176\u5b9e\u5c31\u76f8\u5f53\u4e8e\u94fe\u8868\uff0c\u8fdb\u7a0b\u5f62\u6210\u4e86\u94fe\u8868\uff0c\u7236\u8fdb\u7a0b\u7684fork\u51fd\u6570\u8fd4\u56de\u7684\u503c\u6307\u5411\u5b50\u8fdb\u7a0b\u7684\u8fdb\u7a0bid, \u56e0\u4e3a\u5b50\u8fdb\u7a0b\u6ca1\u6709\u5b50\u8fdb\u7a0b\uff0c\u6240\u4ee5\u5176fork\u51fd\u6570\u8fd4\u56de\u7684\u503c\u4e3a0.<\/div>\n
      \u8c03\u7528fork\u4e4b\u540e\uff0c\u6570\u636e\u3001\u5806\u3001\u6808\u6709\u4e24\u4efd\uff0c\u4ee3\u7801\u4ecd\u7136\u4e3a\u4e00\u4efd\u4f46\u662f\u8fd9\u4e2a\u4ee3\u7801\u6bb5<\/a>\u6210\u4e3a\u4e24\u4e2a\u8fdb\u7a0b\u7684\u5171\u4eab\u4ee3\u7801\u6bb5\u90fd\u4ecefork\u51fd\u6570\u4e2d\u8fd4\u56de\uff0c\u7bad\u5934\u8868\u793a\u5404\u81ea\u7684\u6267\u884c\u5904\u3002\u5f53\u7236\u5b50\u8fdb\u7a0b\u6709\u4e00\u4e2a\u60f3\u8981\u4fee\u6539\u6570\u636e\u6216\u8005\u5806\u6808\u65f6\uff0c\u4e24\u4e2a\u8fdb\u7a0b\u771f\u6b63\u5206\u88c2\u3002<\/div>\n
      \u793a\u4f8b\u4ee3\u7801\uff1a<\/div>\n
      \n
      \n\n\n\n
      \n
      1<\/div>\n
      2<\/div>\n
      3<\/div>\n
      4<\/div>\n
      5<\/div>\n
      6<\/div>\n
      7<\/div>\n
      8<\/div>\n
      9<\/div>\n
      10<\/div>\n
      11<\/div>\n
      12<\/div>\n
      13<\/div>\n
      14<\/div>\n
      15<\/div>\n
      16<\/div>\n
      17<\/div>\n
      18<\/div>\n
      19<\/div>\n
      20<\/div>\n
      21<\/div>\n
      22<\/div>\n
      23<\/div>\n<\/td>\n
      		\n
      \n
      #include<sys\/types.h>\/\/\u5bf9\u4e8e\u6b64\u7a0b\u5e8f\u800c\u8a00\u6b64\u5934\u6587\u4ef6types.h\u7528\u4e0d\u5230<\/code><\/div>\n
      #include<unistd.h><\/code><\/div>\n
      #include<stdio.h><\/code><\/div>\n
      #include<stdlib.h><\/code><\/div>\n
      <\/div>\n
      int<\/code>\u00a0main(<\/code>int<\/code>\u00a0argc,<\/code>char<\/code>\u00a0*argv[])<\/code>\/*\u6574\u6570\u7c7b\u578b\u4e3b\u51fd\u6570*\/<\/code><\/div>\n
      {<\/code><\/div>\n
      pid_t\u00a0pid=fork();<\/code>\/*\u4f20\u9012\u53c2\u6570*\/<\/code><\/div>\n
      if<\/code>(pid<0)<\/code>\/*\u5982\u679c(\u8fdb\u7a0b\u6807\u8bb0<0)*\/<\/code><\/div>\n
      {<\/code><\/div>\n
      fprintf<\/code>(stderr,<\/code>\"\u9519\u8bef\uff01\"<\/code>);<\/code><\/div>\n
      }<\/code><\/div>\n
      else<\/code>\u00a0if<\/code>(pid==0)<\/code>\/*\u5426\u5219\u5982\u679c(\u8fdb\u7a0b\u6807\u8bb0==0)*\/<\/code><\/div>\n
      {<\/code><\/div>\n
      printf<\/code>(<\/code>\"\u767e\u5ea6\u767e\u79d1\uff1a\u8fd9\u662f\u5b50\u8fdb\u7a0b\uff01\"<\/code>);<\/code><\/div>\n
      exit<\/code>(0);<\/code><\/div>\n
      }<\/code><\/div>\n
      else<\/code>\/*\u5426\u5219*\/<\/code>{<\/code><\/div>\n
      printf<\/code>(<\/code>\"\u767e\u5ea6\u767e\u79d1\uff1a\u8fd9\u662f\u7236\u8fdb\u7a0b\uff01\u5b50\u8fdb\u7a0b\u7684\u8fdb\u7a0b\u6807\u8bb0\u4e3a=%d\"<\/code>,pid);<\/code><\/div>\n
      }<\/code><\/div>\n
      \/\/\u53ef\u80fd\u9700\u8981\u65f6\u5019wait\u6216waitpid\u51fd\u6570\u7b49\u5f85\u5b50\u8fdb\u7a0b\u7684\u7ed3\u675f\u5e76\u83b7\u53d6\u7ed3\u675f\u72b6\u6001<\/code><\/div>\n
      exit<\/code>(0);<\/code><\/div>\n
      }<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
      \u6ce8\u610f\uff01\u6837\u4f8b\u4ee3\u7801\u4ec5\u4f9b\u53c2\u8003\uff0c\u6837\u4f8b\u4ee3\u7801\u5b58\u5728\u7740\u7236\u8fdb\u7a0b\u5728\u5b50\u8fdb\u7a0b\u7ed3\u675f\u524d\u7ed3\u675f\u7684\u53ef\u80fd\u6027\u3002\u5fc5\u8981\u7684\u65f6\u5019\u53ef\u4ee5\u4f7f\u7528wait\u6216 waitpid\u51fd\u6570\u8ba9\u7236\u8fdb\u7a0b\u7b49\u5f85\u5b50\u8fdb\u7a0b\u7684\u7ed3\u675f\u5e76\u83b7\u53d6\u5b50\u8fdb\u7a0b\u7684\u8fd4\u56de\u72b6\u6001<\/a>\u3002<\/div>\n
      fork()\u5728Linux\u7cfb\u7edf\u4e2d\u7684\u8fd4\u56de\u503c\u662f\u6ca1\u6709NULL\u7684.<\/div>\n
      Error Codes<\/div>\n
      \u51fa\u9519\u8fd4\u56de\u9519\u8bef\u4fe1\u606f\u5982\u4e0b:<\/div>\n
      EAGAIN<\/i><\/div>\n
      \u8fbe\u5230\u8fdb\u7a0b\u6570\u4e0a\u9650.<\/div>\n
      ENOMEM<\/i><\/div>\n
      \u6ca1\u6709\u8db3\u591f\u7a7a\u95f4\u7ed9\u4e00\u4e2a\u65b0\u8fdb\u7a0b\u5206\u914d.<\/div>\n
      fork\u51fd\u6570\u7684\u7279\u70b9\u6982\u62ec\u8d77\u6765\u5c31\u662f\u201c\u8c03\u7528\u4e00\u6b21\uff0c\u8fd4\u56de\u4e24\u6b21\u201d\uff0c\u5728\u7236\u8fdb\u7a0b<\/a>\u4e2d\u8c03\u7528\u4e00\u6b21\uff0c\u5728\u7236\u8fdb\u7a0b\u548c\u5b50\u8fdb\u7a0b\u4e2d\u5404\u8fd4\u56de\u4e00\u6b21\u3002<\/div>\n
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      [1]<\/sup><\/a><\/div>\n
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