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      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
     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
     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
    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