procctl.c revision 57373 
1/*
2 * Copyright 1997 Sean Eric Fagan
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 * 3. All advertising materials mentioning features or use of this software
13 *    must display the following acknowledgement:
14 *	This product includes software developed by Sean Eric Fagan
15 * 4. Neither the name of the author may be used to endorse or promote
16 *    products derived from this software without specific prior written
17 *    permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 */
32
33#ifndef lint
34static const char rcsid[] =
35  "$FreeBSD: head/usr.sbin/procctl/procctl.c 57373 2000-02-21 10:22:39Z ru $";
36#endif /* not lint */
37
38/*
39 * procctl -- clear the event mask, and continue, any specified processes.
40 * This is largely an example of how to use the procfs interface; however,
41 * for now, it is also sometimes necessary, as a stopped process will not
42 * otherwise continue.  (This will be fixed in a later version of the
43 * procfs code, almost certainly; however, this program will still be useful
44 * for some annoying circumstances.)
45 */
46
47#include <err.h>
48#include <errno.h>
49#include <fcntl.h>
50#include <signal.h>
51#include <stdio.h>
52#include <stdlib.h>
53#include <string.h>
54#include <unistd.h>
55#include <sys/ioctl.h>
56#include <sys/pioctl.h>
57
58int
59main(int ac, char **av) {
60  int fd;
61  int i;
62
63  for (i = 1; i < ac; i++) {
64    char buf[32];
65
66    snprintf(buf, sizeof(buf), "/proc/%s/mem", av[i]);
67    fd = open(buf, O_RDWR);
68    if (fd == -1) {
69      if (errno == ENOENT)
70	continue;
71      warn("cannot open pid %s", av[i]);
72      continue;
73    }
74    if (ioctl(fd, PIOCBIC, ~0) == -1)
75      warn("cannot clear process %s's event mask", av[i]);
76    if (ioctl(fd, PIOCCONT, 0) == -1 && errno != EINVAL)
77      warn("cannot continue process %s", av[i]);
78    close(fd);
79  }
80  return 0;
81}
82