ptools/pstop/pstop.c

	pstop.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 1994-1999 by Sun Microsystems, Inc.
 * All rights reserved.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <signal.h>
#include <libproc.h>

static  int stop(char *);
static  int perr(char *);

static  char    *command;
static  char    *procname;

int
main(int argc, char **argv)
{
    int rc = 0;

    if ((command = strrchr(argv[0], '/')) != NULL)
        command++;
    else
        command = argv[0];

    if (argc <= 1) {
        (void) fprintf(stderr, "usage:\t%s pid ...\n", command);
        (void) fprintf(stderr,
            "  (stop processes with /proc request)\n");
        return (2);
    }

    while (--argc > 0)
        rc += stop(*++argv);

    return (rc);
}

static int
stop(char *arg)
{
    char ctlfile[100];
    long ctl[1];
    int ctlfd, gcode;
    pid_t pid;

    procname = arg;     /* for perr() */
    if ((pid = proc_arg_psinfo(arg, PR_ARG_PIDS, NULL, &gcode)) == -1) {
        (void) fprintf(stderr, "%s: cannot control %s: %s\n",
            command, arg, Pgrab_error(gcode));
        return (1);
    }

    (void) sprintf(ctlfile, "/proc/%d/ctl", (int)pid);
    errno = 0;
    if ((ctlfd = open(ctlfile, O_WRONLY)) >= 0) {
        ctl[0] = PCDSTOP;
        (void) write(ctlfd, ctl, sizeof (long));
        (void) close(ctlfd);
    }

    return (perr(NULL));
}

static int
perr(char *s)
{
    if (errno == 0)
        return (0);
    if (s)
        (void) fprintf(stderr, "%s: ", procname);
    else
        s = procname;
    perror(s);
    return (1);
}