fork子进程执行等待结束代码

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pid_t childpid;                   int nRet = 0;                   if( (childpid =fork()) == 0)                     {                          exit(0);                      }                     else if(childpid == -1)                      {                       nRet = -1;                                         }                     int status = 0;                    for(;;){                       int rpid =waitpid(childpid,&status,0);                        if(rpid ==childpid)                         {                           int rc =WEXITSTATUS(status);                           if( rc != 0)                              nRet = rc;                          }                          else                                  {                                                          nRet = -1;                            }                            break;                   }                   if(0 == nRet)                   {                     //子进程结束执行 }