src/lxc/state.c

   1 /*
   2  * lxc: linux Container library
   3  *
   4  * (C) Copyright IBM Corp. 2007, 2008
   5  *
   6  * Authors:
   7  * Daniel Lezcano <daniel.lezcano at free.fr>
   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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22  */
  23
  24 #include <errno.h>
  25 #include <fcntl.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <time.h>
  30 #include <unistd.h>
  31 #include <sys/file.h>
  32 #include <sys/param.h>
  33 #include <sys/socket.h>
  34 #include <sys/stat.h>
  35 #include <sys/types.h>
  36
  37 #include "cgroup.h"
  38 #include "commands.h"
  39 #include "commands_utils.h"
  40 #include "config.h"
  41 #include "log.h"
  42 #include "lxc.h"
  43 #include "monitor.h"
  44 #include "start.h"
  45
  46 lxc_log_define(lxc_state, lxc);
  47
  48 static const char *const strstate[] = {
  49     "STOPPED",  "STARTING", "RUNNING", "STOPPING",
  50     "ABORTING", "FREEZING", "FROZEN",  "THAWED",
  51 };
  52
  53 const char *lxc_state2str(lxc_state_t state)
  54 {
  55         if (state < STOPPED || state > MAX_STATE - 1)
  56                 return NULL;
  57         return strstate[state];
  58 }
  59
  60 lxc_state_t lxc_str2state(const char *state)
  61 {
  62         size_t len;
  63         lxc_state_t i;
  64         len = sizeof(strstate)/sizeof(strstate[0]);
  65         for (i = 0; i < len; i++)
  66                 if (!strcmp(strstate[i], state))
  67                         return i;
  68
  69         ERROR("invalid state '%s'", state);
  70         return -1;
  71 }
  72
  73 lxc_state_t lxc_getstate(const char *name, const char *lxcpath)
  74 {
  75         return lxc_cmd_get_state(name, lxcpath);
  76 }
  77
  78 static int fillwaitedstates(const char *strstates, lxc_state_t *states)
  79 {
  80         char *token, *saveptr = NULL;
  81         char *strstates_dup = strdup(strstates);
  82         int state;
  83
  84         if (!strstates_dup)
  85                 return -1;
  86
  87         token = strtok_r(strstates_dup, "|", &saveptr);
  88         while (token) {
  89
  90                 state = lxc_str2state(token);
  91                 if (state < 0) {
  92                         free(strstates_dup);
  93                         return -1;
  94                 }
  95
  96                 states[state] = 1;
  97
  98                 token = strtok_r(NULL, "|", &saveptr);
  99         }
 100         free(strstates_dup);
 101         return 0;
 102 }
 103
 104 extern int lxc_wait(const char *lxcname, const char *states, int timeout,
 105                     const char *lxcpath)
 106 {
 107         int state = -1;
 108         lxc_state_t s[MAX_STATE] = {0};
 109
 110         if (fillwaitedstates(states, s))
 111                 return -1;
 112
 113         for (;;) {
 114                 state = lxc_cmd_sock_get_state(lxcname, lxcpath, s, timeout);
 115                 if (state >= 0)
 116                         break;
 117
 118                 if (errno != ECONNREFUSED) {
 119                         SYSERROR("Failed to receive state from monitor");
 120                         return -1;
 121                 }
 122
 123                 if (timeout > 0)
 124                         timeout--;
 125
 126                 if (timeout == 0)
 127                         return -1;
 128
 129                 sleep(1);
 130         }
 131
 132         if (state < 0) {
 133                 ERROR("Failed to retrieve state from monitor");
 134                 return -1;
 135         }
 136
 137         TRACE("Retrieved state of container %s", lxc_state2str(state));
 138         if (!s[state])
 139                 return -1;
 140
 141         return 0;
 142 }