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
38static	int	stop(char *);
39static	int	lwpstop(int *, const lwpstatus_t *, const lwpsinfo_t *);
40
41static	char	*command;
42static	const char *lwps;
43static	struct	ps_prochandle *P;
44
45int
46main(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
68static int
69stop(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 */
112static int
113lwpstop(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