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     #include <sys/types.h>
     #include <unistd.h>
     pid_t fork(void);
      ‘fork()’º¯ÊýÓÃÓÚ´ÓÒÑ´æÔÚ½ø³ÌÖд´½¨Ò»¸öнø³Ì¡£Ð½ø³Ì³ÆÎª×Ó½ø³Ì£¬¶øÔ­½ø³Ì³ÆÎª¸¸½ø³Ì¡£Äã¿ÉÒÔͨ¹ý¼ì²é‘fork()’º¯ÊýµÄ·µ»ØÖµÖªµÀÄĸöÊǸ¸½ø³Ì£¬ÄĸöÊÇ×Ó½ø³Ì¡£¸¸½ø³ÌµÃµ½µÄ·µ»ØÖµÊÇ×Ó½ø³ÌµÄ½ø³ÌºÅ£¬¶ø×Ó½ø³ÌÔò·µ»Ø0¡£ÒÔÏÂÕâ¸ö·¶Àý³ÌÐò˵Ã÷ËüµÄ»ù±¾¹¦ÄÜ£º
     pid_t pid;
     switch (pid = fork())
     {
     case -1:
         /* ÕâÀïpidΪ-1£¬forkº¯Êýʧ°Ü */
         /* һЩ¿ÉÄܵÄÔ­ÒòÊÇ */
         /* ½ø³ÌÊý»òÐéÄâÄÚ´æÓþ¡ */
         perror("The fork failed!");
         break;
     case 0:
         /* pidΪ0£¬×Ó½ø³Ì */
         /* ÕâÀÎÒÃÇÊǺ¢×Ó£¬Òª×öʲô£¿ */
         /* ... */
         /* µ«ÊÇ×öÍêºó, ÎÒÃÇÐèÒª×öÀàËÆÏÂÃæ£º */
         _exit(0);
     default:
         /* pid´óÓÚ0£¬Îª¸¸½ø³ÌµÃµ½µÄ×Ó½ø³ÌºÅ */
         printf("Child's pid is %d\n",pid);
     }
      µ±È»£¬ÓÐÈË¿ÉÒÔÓÑif() ... else ...’Óï¾äÈ¡´ú‘switch()’Óï¾ä£¬µ«ÊÇÉÏÃæµÄÐÎʽÊÇÒ»¸öÓÐÓõĹßÓ÷½·¨¡£
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client .c
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <linux/input.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#inclu ......

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#pragma comment(lib, "ws2_32.lib")
#include <Winsock2.h>
#include <stdio.h>

void main()
{
//°æ±¾Ð­ÉÌ
WORD wVersionRequested;
WSADATA wsaData;
int err;

wVersionRequested = MAKEWORD(1,1); //0x0101
err = WSAStartup ......

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