usr.sbin/procctl/procctl.c

   1 /*
   2  * Copyright 1997 Sean Eric Fagan
   3  * Copyright (c) 2004 Liam J. Foy <liamfoy@sepulcrum.org>
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by Sean Eric Fagan
  16  * 4. Neither the name of the author may be used to endorse or promote
  17  *    products derived from this software without specific prior written
  18  *    permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * $FreeBSD: src/usr.sbin/procctl/procctl.c,v 1.6 2000/02/21 10:22:39 ru Exp $
  33  * $DragonFly: src/usr.sbin/procctl/procctl.c,v 1.3 2004/12/06 21:13:51 liamfoy Exp $
  34  */
  35
  36 /*
  37  * procctl -- clear the event mask, and continue, any specified processes.
  38  * This is largely an example of how to use the procfs interface; however,
  39  * for now, it is also sometimes necessary, as a stopped process will not
  40  * otherwise continue.  (This will be fixed in a later version of the
  41  * procfs code, almost certainly; however, this program will still be useful
  42  * for some annoying circumstances.)
  43  */
  44
  45 #include <err.h>
  46 #include <errno.h>
  47 #include <fcntl.h>
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51 #include <unistd.h>
  52 #include <sys/ioctl.h>
  53 #include <sys/param.h>
  54 #include <sys/pioctl.h>
  55
  56 static void     usage(void);
  57
  58 int
  59 main(int argc, char **argv)
  60 {
  61         int c, vflag, fd;
  62
  63         vflag = 0;
  64         while ((c = getopt(argc, argv, "v")) != -1) {
  65                 switch (c) {
  66                 case 'v':
  67                         vflag = 1;
  68                         break;
  69                 default:
  70                         usage();
  71                 }
  72         }
  73
  74         argc -= optind;
  75         argv += optind;
  76
  77         if (argc == 0)
  78                 usage();
  79
  80         for (; *argv; ++argv) {
  81                 char buf[MAXPATHLEN];
  82
  83                 snprintf(buf, sizeof(buf), "/proc/%s/mem", *argv);
  84                 fd = open(buf, O_RDWR);
  85                 if (fd == -1) {
  86                         if (!vflag && errno == ENOENT)
  87                                 continue;
  88                         warn("cannot open pid %s", *argv);
  89                         continue;
  90                 }
  91
  92                 if (ioctl(fd, PIOCBIC, ~0) == -1)
  93                         warn("cannot clear process %s's event mask", *argv);
  94                 else if (vflag)
  95                         printf("successfully cleared process %s\n", *argv);
  96
  97                 if (ioctl(fd, PIOCCONT, 0) == -1 && errno != EINVAL)
  98                         warn("cannot continue process %s", *argv);
  99                 else if (vflag)
 100                         printf("process %s continued\n", *argv);
 101                 close(fd);
 102         }
 103         return 0;
 104 }
 105
 106 static void
 107 usage(void)
 108 {
 109
 110         fprintf(stderr, "usage: procctl [-v] pid...\n");
 111         exit(EXIT_FAILURE);
 112 }