procctl.c revision 31897 
1/*
2 * Copryight 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/*
34 * procctl -- clear the event mask, and continue, any specified processes.
35 * This is largely an example of how to use the procfs interface; however,
36 * for now, it is also sometimes necessary, as a stopped process will not
37 * otherwise continue.  (This will be fixed in a later version of the
38 * procfs code, almost certainly; however, this program will still be useful
39 * for some annoying circumstances.)
40 */
41/*
42 * $Id: procctl.c,v 1.2 1997/12/13 03:13:49 sef Exp $
43 */
44
45#include <stdio.h>
46#include <stdlib.h>
47#include <string.h>
48#include <errno.h>
49#include <err.h>
50#include <signal.h>
51#include <fcntl.h>
52#include <sys/ioctl.h>
53#include <sys/pioctl.h>
54
55main(int ac, char **av) {
56  int fd;
57  int i;
58  unsigned int mask;
59  char **command;
60  struct procfs_status pfs;
61
62  for (i = 1; i < ac; i++) {
63    char buf[32];
64
65    sprintf(buf, "/proc/%s/mem", av[i]);
66    fd = open(buf, O_RDWR);
67    if (fd == -1) {
68      if (errno == ENOENT)
69	continue;
70      fprintf(stderr, "%s:  cannot open pid %s:  %s\n",
71	      av[0], av[i], strerror(errno));
72      continue;
73    }
74    if (ioctl(fd, PIOCBIC, ~0) == -1) {
75      fprintf(stderr, "%s:  cannot clear process %s's event mask: %s\n",
76	      av[0], av[i], strerror(errno));
77    }
78    if (ioctl(fd, PIOCCONT, 0) == -1 && errno != EINVAL) {
79      fprintf(stderr, "%s:  cannot continue process %s:  %s\n",
80	      av[0], av[i], strerror(errno));
81    }
82    close(fd);
83  }
84  return 0;
85}
86