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