4.3BSD-Reno/src/usr.bin/window/wwchild.c

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Edward Wang at The University of California, Berkeley.
 *
 * Redistribution and use in source and binary forms are permitted provided
 * that: (1) source distributions retain this entire copyright notice and
 * comment, and (2) distributions including binaries display the following
 * acknowledgement:  ``This product includes software developed by the
 * University of California, Berkeley and its contributors'' in the
 * documentation or other materials provided with the distribution and in
 * all advertising materials mentioning features or use of this software.
 * Neither the name of the University nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
static char sccsid[] = "@(#)wwchild.c	3.12 (Berkeley) 6/6/90";
#endif /* not lint */

#include "ww.h"
#include <sys/wait.h>

wwchild()
{
	extern errno;
	int olderrno;
	register struct ww **wp;
	union wait w;
	int pid;
	char collected = 0;

	olderrno = errno;
	while ((pid = wait3(&w, WNOHANG|WUNTRACED, (struct rusage *)0)) > 0) {
		for (wp = wwindex; wp < &wwindex[NWW]; wp++) {
			if (*wp && (*wp)->ww_state == WWS_HASPROC
			    && (*wp)->ww_pid == pid) {
				(*wp)->ww_state = WWS_DEAD;
				collected = 1;
				break;
			}
		}
	}
	errno = olderrno;
	/* jump out of wwiomux when somebody dies */
	if (collected)
		wwsetintr();
}