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 #include "lpsched.h"
31
32 /*
33 * terminate() - STOP A CHILD PROCESS
34 *
35 * Note: If you're trying to debug lpsched, and worried about
36 * seeing lots of calls to terminate() in the debug output,
37 * don't be; it gets called once for each entry in the child
38 * process table, whether or not there's such a child.
39 */
40
41 void
terminate(register EXEC * ep)42 terminate(register EXEC *ep)
43 {
44 int retries; /* fix for sunsoft bugid 1108465 */
45
46 if (ep->pid <= 0)
47 return;
48
49 if (ep->flags & EXF_KILLED)
50 return;
51 ep->flags |= EXF_KILLED;
52
53 /*
54 * Theoretically, the following "if-then" is not needed,
55 * but there's some bug in the code that occasionally
56 * prevents us from hearing from a finished child.
57 * (Kill -9 on the child would do that, of course, but
58 * the problem has occurred in other cases.)
59 */
60 if (kill(-ep->pid, SIGTERM) == -1 && errno == ESRCH) {
61 ep->pid = -99;
62 ep->status = SIGTERM;
63 ep->Errno = 0;
64 DoneChildren++;
65 return;
66 }
67
68 /*
69 * Start fix for sunsoft bugid 1108465
70 * the original code here was extremely optimistic, and
71 * under certain circumstances, the pid's would still be
72 * left around. here we get really serious about killing
73 * the sucker.
74 * we patiently wait for the pid to die. if it doesn't
75 * do so in a reasonable amount of time, we get more forceful.
76 * note that the original "ep->pid == -99" is a crude hack;
77 * but that the convention is being followed. sigh.
78 */
79 for (retries = 5; retries > 0; retries--) {
80 /* see if the process is still there */
81 if ((kill(-ep->pid, 0) == -1) && (errno == ESRCH)) {
82 ep->pid = -99;
83 ep->status = SIGTERM;
84 ep->Errno = 0;
85 DoneChildren++;
86 return;
87 } else if (errno == EINTR)
88 break;
89
90 sleep(2);
91 }
92
93 /* if it's still not dead, then get more forceful */
94 for (retries = 5; retries > 0; retries--) {
95 if ((kill(-ep->pid, SIGKILL) == -1) && (errno == ESRCH)) {
96 ep->pid = -99;
97 ep->status = SIGTERM;
98 ep->Errno = 0;
99 DoneChildren++;
100 return;
101 }
102 sleep(3);
103 }
104 /* end of sunsoft bugfix 1108465 */
105 /*
106 * well hardkill didn't work so just flag this request as done
107 */
108 ep->pid = -99;
109 ep->status = SIGTERM;
110 ep->Errno = 0;
111 DoneChildren++;
112 }
113