test/lxc_low_monitor.c

   1 /*
   2  * lxc: linux Container library
   3  *
   4  * (C) Copyright IBM Corp. 2007, 2008
   5  *
   6  * Authors:
   7  * Daniel Lezcano <dlezcano at fr.ibm.com>
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23 #include <stdio.h>
  24 #include <unistd.h>
  25 #include <string.h>
  26 #include <libgen.h>
  27
  28 #include <lxc.h>
  29
  30 void usage(char *cmd)
  31 {
  32         fprintf(stderr, "%s <command>\n", basename(cmd));
  33         fprintf(stderr, "\t -n <name>   : name of the container\n");
  34         _exit(1);
  35 }
  36
  37 int main(int argc, char *argv[])
  38 {
  39         char opt;
  40         char *name = NULL;
  41         int fd;
  42
  43         while ((opt = getopt(argc, argv, "n:")) != -1) {
  44                 switch (opt) {
  45                 case 'n':
  46                         name = optarg;
  47                         break;
  48                 }
  49         }
  50
  51         if (!name)
  52                 usage(argv[0]);
  53
  54         fd = lxc_monitor_open(name);
  55         if (fd < 0) {
  56                 fprintf(stderr, "failed to open monitor\n");
  57                 return -1;
  58         }
  59
  60         for (;;) {
  61                 lxc_state_t state;
  62                 lxc_monitor_read(fd, &state);
  63                 printf("received changing state '%s'\n", lxc_state2str(state));
  64         }
  65 }