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 <sys/socket.h>
  33 #include <fcntl.h>
  34
  35 #include <lxc/log.h>
  36 #include <lxc/start.h>
  37
  38 #include "lxc.h"
  39 #include "commands.h"
  40
  41 lxc_log_define(lxc_stop, lxc);
  42
  43 int lxc_stop(const char *name)
  44 {
  45         struct lxc_command command = {
  46                 .request = { .type = LXC_COMMAND_STOP },
  47         };
  48
  49         int ret, stopped = 0;
  50
  51         ret = lxc_command(name, &command,&stopped);
  52         if (ret < 0 && stopped) {
  53                 INFO("'%s' is already stopped", name);
  54                 return 0;
  55         }
  56
  57         if (ret < 0) {
  58                 ERROR("failed to send command");
  59                 return -1;
  60         }
  61
  62         /* we do not expect any answer, because we wait for the connection to be
  63          * closed
  64          */
  65         if (ret > 0) {
  66                 ERROR("failed to stop '%s': %s",
  67                         name, strerror(-command.answer.ret));
  68                 return -1;
  69         }
  70
  71         INFO("'%s' has stopped", name);
  72
  73         return 0;
  74 }
  75
  76 /*----------------------------------------------------------------------------
  77  * functions used by lxc-start mainloop
  78  * to handle above command request.
  79  *--------------------------------------------------------------------------*/
  80 extern int lxc_stop_callback(int fd, struct lxc_request *request,
  81                         struct lxc_handler *handler)
  82 {
  83         struct lxc_answer answer;
  84         int ret;
  85
  86         answer.ret = kill(handler->pid, SIGKILL);
  87         if (!answer.ret) {
  88                 ret = lxc_unfreeze(handler->name);
  89                 if (!ret)
  90                         return 0;
  91
  92                 ERROR("failed to unfreeze container");
  93                 answer.ret = ret;
  94         }
  95
  96         ret = send(fd, &answer, sizeof(answer), 0);
  97         if (ret < 0) {
  98                 WARN("failed to send answer to the peer");
  99                 goto out;
 100         }
 101
 102         if (ret != sizeof(answer)) {
 103                 ERROR("partial answer sent");
 104                 goto out;
 105         }
 106
 107 out:
 108         return -1;
 109 }
 110