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 #define _GNU_SOURCE
  25 #include <errno.h>
  26 #include <fcntl.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <time.h>
  31 #include <unistd.h>
  32 #include <sys/file.h>
  33 #include <sys/param.h>
  34 #include <sys/socket.h>
  35 #include <sys/stat.h>
  36 #include <sys/types.h>
  37
  38 #include "cgroup.h"
  39 #include "commands.h"
  40 #include "commands_utils.h"
  41 #include "config.h"
  42 #include "log.h"
  43 #include "lxc.h"
  44 #include "monitor.h"
  45 #include "start.h"
  46 #include "utils.h"
  47
  48 lxc_log_define(state, lxc);
  49
  50 static const char *const strstate[] = {
  51     "STOPPED",  "STARTING", "RUNNING", "STOPPING",
  52     "ABORTING", "FREEZING", "FROZEN",  "THAWED",
  53 };
  54
  55 const char *lxc_state2str(lxc_state_t state)
  56 {
  57         if (state < STOPPED || state > MAX_STATE - 1)
  58                 return NULL;
  59         return strstate[state];
  60 }
  61
  62 lxc_state_t lxc_str2state(const char *state)
  63 {
  64         size_t len;
  65         lxc_state_t i;
  66         len = sizeof(strstate)/sizeof(strstate[0]);
  67         for (i = 0; i < len; i++)
  68                 if (!strcmp(strstate[i], state))
  69                         return i;
  70
  71         ERROR("invalid state '%s'", state);
  72         return -1;
  73 }
  74
  75 lxc_state_t lxc_getstate(const char *name, const char *lxcpath)
  76 {
  77         return lxc_cmd_get_state(name, lxcpath);
  78 }
  79
  80 static int fillwaitedstates(const char *strstates, lxc_state_t *states)
  81 {
  82         char *token;
  83         char *strstates_dup;
  84         int state;
  85
  86         strstates_dup = strdup(strstates);
  87         if (!strstates_dup)
  88                 return -1;
  89
  90         lxc_iterate_parts(token, strstates_dup, "|") {
  91                 state = lxc_str2state(token);
  92                 if (state < 0) {
  93                         free(strstates_dup);
  94                         return -1;
  95                 }
  96
  97                 states[state] = 1;
  98         }
  99         free(strstates_dup);
 100         return 0;
 101 }
 102
 103 int lxc_wait(const char *lxcname, const char *states, int timeout,
 104              const char *lxcpath)
 105 {
 106         int state = -1;
 107         lxc_state_t s[MAX_STATE] = {0};
 108
 109         if (fillwaitedstates(states, s))
 110                 return -1;
 111
 112         for (;;) {
 113                 struct timespec onesec = {
 114                     .tv_sec = 1,
 115                     .tv_nsec = 0,
 116                 };
 117
 118                 state = lxc_cmd_sock_get_state(lxcname, lxcpath, s, timeout);
 119                 if (state >= 0)
 120                         break;
 121
 122                 if (errno != ECONNREFUSED) {
 123                         SYSERROR("Failed to receive state from monitor");
 124                         return -1;
 125                 }
 126
 127                 if (timeout > 0)
 128                         timeout--;
 129
 130                 if (timeout == 0)
 131                         return -1;
 132
 133                 (void)nanosleep(&onesec, NULL);
 134         }
 135
 136         if (state < 0) {
 137                 ERROR("Failed to retrieve state from monitor");
 138                 return -1;
 139         }
 140
 141         TRACE("Retrieved state of container %s", lxc_state2str(state));
 142         if (!s[state])
 143                 return -1;
 144
 145         return 0;
 146 }