gr_wait.c
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- /*
- * 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: MRC@CAC.Washington.EDU
- *
- * Date: 30 November 1993
- * Last Edited: 9 October 1995
- *
- * Copyright 1995 by the University of Washington
- *
- * Permission to use, copy, modify, and distribute this software and its
- * documentation for any purpose and without fee is hereby granted, provided
- * that the above copyright notice appears in all copies and that both the
- * above copyright notice and this permission notice appear in supporting
- * documentation, and that the name of the University of Washington not be
- * used in advertising or publicity pertaining to distribution of the software
- * without specific, written prior permission. This software is made available
- * "as is", and
- * THE UNIVERSITY OF WASHINGTON DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED,
- * WITH REGARD TO THIS SOFTWARE, INCLUDING WITHOUT LIMITATION ALL IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND IN
- * NO EVENT SHALL THE UNIVERSITY OF WASHINGTON BE LIABLE FOR ANY SPECIAL,
- * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
- * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, TORT
- * (INCLUDING NEGLIGENCE) OR STRICT LIABILITY, ARISING OUT OF OR IN CONNECTION
- * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- */
-
- /* 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)));
- }