procctl.c revision 31565 
1/*
2 * procctl -- clear the event mask, and continue, any specified processes.
3 * This is largely an example of how to use the procfs interface; however,
4 * for now, it is also sometimes necessary, as a stopped process will not
5 * otherwise continue.  (This will be fixed in a later version of the
6 * procfs code, almost certainly; however, this program will still be useful
7 * for some annoying circumstances.)
8 */
9/*
10 * $Id$
11 */
12
13#include <stdio.h>
14#include <stdlib.h>
15#include <string.h>
16#include <errno.h>
17#include <err.h>
18#include <signal.h>
19#include <fcntl.h>
20#include <sys/ioctl.h>
21#include <sys/pioctl.h>
22
23main(int ac, char **av) {
24  int fd;
25  int i;
26  unsigned int mask;
27  char **command;
28  struct procfs_status pfs;
29
30  for (i = 1; i < ac; i++) {
31    char buf[32];
32
33    sprintf(buf, "/proc/%s/mem", av[i]);
34    fd = open(buf, O_RDWR);
35    if (fd == -1) {
36      if (errno == ENOENT)
37	continue;
38      fprintf(stderr, "%s:  cannot open pid %s:  %s\n",
39	      av[0], av[i], strerror(errno));
40      continue;
41    }
42    mask = ~0;
43    if (ioctl(fd, PIOCBIC, &mask) == -1) {
44      fprintf(stderr, "%s:  cannot clear process %s's event mask: %s\n",
45	      av[0], av[i], strerror(errno));
46    }
47    mask = 0;
48    if (ioctl(fd, PIOCCONT, &mask) == -1 && errno != EINVAL) {
49      fprintf(stderr, "%s:  cannot continue process %s:  %s\n",
50	      av[0], av[i], strerror(errno));
51    }
52    close(fd);
53  }
54  return 0;
55}
56