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