src/lxc/stop.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 <stdlib.h>
  25 #include <string.h>
  26 #include <errno.h>
  27 #include <unistd.h>
  28 #include <sys/param.h>
  29 #include <sys/signal.h>
  30 #include <sys/types.h>
  31 #include <sys/stat.h>
  32 #include <fcntl.h>
  33
  34 #include <lxc/lxc.h>
  35 #include <lxc/log.h>
  36
  37 lxc_log_define(lxc_stop, lxc);
  38
  39 #define MAXPIDLEN 20
  40
  41 int lxc_stop(const char *name)
  42 {
  43         char init[MAXPATHLEN];
  44         char val[MAXPIDLEN];
  45         int fd, lock, ret = -LXC_ERROR_INTERNAL;
  46         size_t pid;
  47
  48         lock = lxc_get_lock(name);
  49         if (lock >= 0) {
  50                 lxc_put_lock(lock);
  51                 return -LXC_ERROR_ESRCH;
  52         }
  53
  54         if (lock < 0 && lock != -LXC_ERROR_EBUSY)
  55                 return lock;
  56
  57         snprintf(init, MAXPATHLEN, LXCPATH "/%s/init", name);
  58         fd = open(init, O_RDONLY);
  59         if (fd < 0) {
  60                 SYSERROR("failed to open init file for %s", name);
  61                 goto out_close;
  62         }
  63
  64         if (read(fd, val, sizeof(val)) < 0) {
  65                 SYSERROR("failed to read %s", init);
  66                 goto out_close;
  67         }
  68
  69         pid = atoi(val);
  70
  71         if (kill(pid, SIGKILL)) {
  72                 SYSERROR("failed to kill %zd", pid);
  73                 goto out_close;
  74         }
  75
  76         ret = 0;
  77
  78 out_close:
  79         close(fd);
  80         return ret;
  81 }