如何在C语言中使用等待联合

Question

union wait wstat;
        pid_t pid;

        while(1)
        {
            pid = wait3(&wstat,WNOHANG,(struct rusage *)NULL);
            if(pid == 0 )
                return;
            else if(pid == -1)
                return;
            else
            {
                fprintf(stderr,"\nProcess with PID : %d exited with return value: %d\n",pid,wstat.w_retcode);
                deleteJob(pid);
            }
        }

我正在尝试在unix shell上使用等待联合，但我无法使用它，因为我遇到了错误

wait' isn't known
warning: implicit declaration of function

wait3']的存储大小

工会等待wstat; pid_t pid; while（1）{pid = wait3（＆wstat，WNOHANG，（struct rusage *）NULL）; if（pid == 0）返回;其他...

Answer 1

您应添加以下包含文件：