Home | History | Annotate | Download | only in lpsched
      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 
     22 /*
     23  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
     28 /*	  All Rights Reserved  	*/
     29 
     30 
     31 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     32 
     33 #include "lpsched.h"
     34 
     35 /*
     36  * terminate() - STOP A CHILD PROCESS
     37  *
     38  * Note:  If you're trying to debug lpsched, and worried about
     39  *        seeing lots of calls to terminate() in the debug output,
     40  *        don't be; it gets called once for each entry in the child
     41  *        process table, whether or not there's such a child.
     42  */
     43 
     44 void
     45 terminate(register EXEC *ep)
     46 {
     47 	int retries;		/* fix for sunsoft bugid 1108465	*/
     48 
     49 	if (ep->pid <= 0)
     50 		return;
     51 
     52 	if (ep->flags & EXF_KILLED)
     53 		return;
     54 	ep->flags |= EXF_KILLED;
     55 
     56 	/*
     57 	 * Theoretically, the following "if-then" is not needed,
     58 	 * but there's some bug in the code that occasionally
     59 	 * prevents us from hearing from a finished child.
     60 	 * (Kill -9 on the child would do that, of course, but
     61 	 * the problem has occurred in other cases.)
     62 	 */
     63 	if (kill(-ep->pid, SIGTERM) == -1 && errno == ESRCH) {
     64 		ep->pid = -99;
     65 		ep->status = SIGTERM;
     66 		ep->Errno = 0;
     67 		DoneChildren++;
     68 		return;
     69 	}
     70 
     71 	/*
     72 	 * Start fix for sunsoft bugid 1108465
     73 	 * the original code here was extremely optimistic, and
     74 	 * under certain circumstances, the pid's would still be
     75 	 * left around. here we get really serious about killing
     76 	 * the sucker.
     77 	 * we patiently wait for the pid to die. if it doesn't
     78 	 * do so in a reasonable amount of time, we get more forceful.
     79 	 * note that the original "ep->pid == -99" is a crude hack;
     80 	 * but that the convention is being followed. sigh.
     81 	 */
     82 	for (retries = 5; retries > 0; retries--) {
     83 		/* see if the process is still there		*/
     84 		if ((kill(-ep->pid, 0) == -1) && (errno == ESRCH)) {
     85 			ep->pid = -99;
     86 			ep->status = SIGTERM;
     87 			ep->Errno = 0;
     88 			DoneChildren++;
     89 			return;
     90 		} else if (errno == EINTR)
     91 			break;
     92 
     93 		sleep(2);
     94 	}
     95 
     96 	/* if it's still not dead, then get more forceful	*/
     97 	for (retries = 5; retries > 0; retries--) {
     98 		if ((kill(-ep->pid, SIGKILL) == -1) && (errno == ESRCH)) {
     99 			ep->pid = -99;
    100 			ep->status = SIGTERM;
    101 			ep->Errno = 0;
    102 			DoneChildren++;
    103 			return;
    104 		}
    105 		sleep(3);
    106 	}
    107 	/* end of sunsoft bugfix 1108465	*/
    108 	/*
    109 	 * well hardkill didn't work so just flag this request as done
    110 	 */
    111 	ep->pid = -99;
    112 	ep->status = SIGTERM;
    113 	ep->Errno = 0;
    114 	DoneChildren++;
    115 }
    116