关于函数wait的使用

文武12

#include<process.h>
void command()
{
     int pid;
     
     if((pid=fork())<0)
        {
               printf("create child process error\n");
        }
     
     if(pid==0)
        {
             printf("\n\n");
             printf("execute child \n");
              exit(0);
   
         }
         wait((int *)0);
}


main()
{
    printf("paraent process\n);
    command();
}
输出结果是：
paraent process

execute child
paraent process
paraent process
execute child
paraent process
paraent process

我想知道wait起到什么作用，他是怎么执行的，请知道者解释一下

xLoneStar

我执行了一下，好像没出现你那么夸张的结果嘛

wait 函数挂起当前进程，直到有某个子进程退出为止。

文武12

这是一本书上的。

mozilla

The  wait  function suspends execution of the current pro-cess until a child has exited, or until a signal is deliv-ered  whose  action is to terminate the current process or to call a  signal  handling  function.   If  a  child  has already  exited by the time of the call (a so-called "zom-bie" process), the function returns immediately.  Any sys- tem resources used by the child are freed.

vimcdoc

[quote:f96ac632fe="文武12"]这是一本书上的。[/quote]

Read the _classic_ books. [APUE, UNP, etc.]