gr_wait.c

来自「这是用C编写IMAP源代码」· C语言 代码 · 共 39 行

/*
 * Program:	UNIX Grim PID Reaper -- wait() version
 *
 * Author:	Mark Crispin
 *		Networks and Distributed Computing
 *		Computing & Communications
 *		University of Washington
 *		Administration Building, AG-44
 *		Seattle, WA  98195
 *		Internet: [e-mail]
 *
 * Date:	30 November 1993
 * Last Edited:	24 October 2000
 * 
 * The IMAP toolkit provided in this Distribution is
 * Copyright 2000 University of Washington.
 * The full text of our legal notices is contained in the file called
 * CPYRIGHT, included with this Distribution.
 */
 
/* Grim PID reaper
 * Accepts: process ID
 *	    kill request flag
 *	    status return value
 */

void grim_pid_reap_status (int pid,int killreq,void *status)
{
  int r;
  if (killreq) {
    kill (pid,SIGHUP);		/* kill if not already dead */
    alarm (10);			/* in case we get hosed */
    while (((r = wait (NIL)) != pid) &&
	   ((r > 0) || ((errno != ECHILD) && (errno != EINTR))));
    alarm (0);			/* cancel the alarm */
  }
  else while (((r = wait (status)) != pid) && ((r > 0) || (errno != ECHILD)));
}