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 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 #pragma ident "%Z%%M% %I% %E% SMI"
27
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <unistd.h>
31 #include <fcntl.h>
32 #include <string.h>
33 #include <errno.h>
34 #include <sys/types.h>
35 #include <signal.h>
36 #include <libproc.h>
37
38 static int stop(char *);
39 static int lwpstop(int *, const lwpstatus_t *, const lwpsinfo_t *);
40
41 static char *command;
42 static const char *lwps;
43 static struct ps_prochandle *P;
44
45 int
main(int argc,char ** argv)46 main(int argc, char **argv)
47 {
48 int rc = 0;
49
50 if ((command = strrchr(argv[0], '/')) != NULL)
51 command++;
52 else
53 command = argv[0];
54
55 if (argc <= 1) {
56 (void) fprintf(stderr, "usage:\t%s pid[/lwps] ...\n", command);
57 (void) fprintf(stderr,
58 " (stop processes or lwps with /proc request)\n");
59 return (2);
60 }
61
62 while (--argc > 0)
63 rc += stop(*++argv);
64
65 return (rc);
66 }
67
68 static int
stop(char * arg)69 stop(char *arg)
70 {
71 int gcode;
72 int rc = 0;
73
74 if ((P = proc_arg_xgrab(arg, NULL, PR_ARG_PIDS, PGRAB_RETAIN |
75 PGRAB_NOSTOP | PGRAB_FORCE, &gcode, &lwps)) == NULL) {
76 (void) fprintf(stderr, "%s: cannot control %s: %s\n",
77 command, arg, Pgrab_error(gcode));
78 return (1);
79 } else if (lwps != NULL) {
80 /*
81 * The user has provided an lwp specification. Let's consider
82 * the lwp specification as a mask. We iterate over all lwps in
83 * the process and stop every lwp, which matches the mask. If
84 * there is no lwp matching the mask or an error occured during
85 * the iteration, set the return code to 1 as indication of an
86 * error.
87 */
88 int lwpcount = 0;
89
90 (void) Plwp_iter_all(P, (proc_lwp_all_f *)lwpstop, &lwpcount);
91 if (lwpcount == 0) {
92 (void) fprintf(stderr, "%s: cannot control %s:"
93 " no matching LWPs found\n", command, arg);
94 rc = 1;
95 } else if (lwpcount == -1)
96 rc = 1;
97 } else {
98 (void) Pdstop(P); /* Stop the process. */
99 }
100
101 /*
102 * Prelease could change the tracing flags, use Pfree and unset
103 * run-on-last-close flag to prevent the process being set running
104 * after detaching from it.
105 */
106 (void) Punsetflags(P, PR_RLC);
107 Pfree(P);
108 return (rc);
109 }
110
111 /* ARGSUSED */
112 static int
lwpstop(int * lwpcount,const lwpstatus_t * status,const lwpsinfo_t * info)113 lwpstop(int *lwpcount, const lwpstatus_t *status, const lwpsinfo_t *info)
114 {
115 struct ps_lwphandle *L;
116 int gcode;
117
118 if (proc_lwp_in_set(lwps, info->pr_lwpid)) {
119 /*
120 * There is a race between the callback from the iterator and
121 * grabbing of the lwp. If the lwp has already exited, Lgrab
122 * will return the error code G_NOPROC. It's not a real error,
123 * only if there is no lwp matching the specification.
124 */
125 if ((L = Lgrab(P, info->pr_lwpid, &gcode)) != NULL) {
126 (void) Ldstop(L);
127 Lfree(L);
128 if (*lwpcount >= 0)
129 (*lwpcount)++;
130 } else if (gcode != G_NOPROC) {
131 (void) fprintf(stderr, "%s: cannot control %d/%d: %s\n",
132 command, (int)Pstatus(P)->pr_pid,
133 (int)info->pr_lwpid, Lgrab_error(gcode));
134 *lwpcount = -1;
135 }
136 }
137 return (0);
138 }
139