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#include<sys/types.h>
#include<sys/wait.h>
pid_t wait(int *status);
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pid = wait(NULL);
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/*wait.c*/
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
      
int main()
{
       pid_t pc, pr;
      
       pc = fork();
       if ( pc < 0 ) /* Èç¹û³ö´í */
  {
         printf("create child prcocess error: %s\n", strerror(errno));
         exit(1);
  }
       else if ( pc == 0) /* Èç¹ûÊÇ×Ó½ø³Ì */
       {
         printf("I am child process with pid %d \n", getpid());
         sleep(3);/* Ë¯Ãß3ÃëÖÓ */
         exit(0);
  }
       else /* Èç¹ûÊǸ¸½ø³Ì */
      &nbs


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