上代码

学习网络上的文章，  非常感谢

但是和我的环境有点不一样，我简单改了改程序：

[root@localhost wait]# cat waittest.c#include 
     
      #include 
      
       #include 
       
        #include 
        
         #include
         
          main(){    pid_t pc, pr;     pc=fork();    if(pc<0)        printf("Error occured on forking.\n");    else if(pc==0)    {        sleep(4);       exit(0);    }        do    {       pr=waitpid(pc, NULL, WNOHANG);        if(pr==0)       {             printf("No child exited\n");          sleep(1);       }    }while(pr==0);        if(pr==pc)         printf("successfully release child %d\n", pr);    else         printf("some error occured\n");}[root@localhost wait]#
         
        
       
      
     

结束