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0ad19a3f | 1 | /* |
2 | * lxc: linux Container library | |
3 | * | |
4 | * (C) Copyright IBM Corp. 2007, 2008 | |
5 | * | |
6 | * Authors: | |
9afe19d6 | 7 | * Daniel Lezcano <daniel.lezcano at free.fr> |
0ad19a3f | 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 | |
250b1eec | 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
0ad19a3f | 22 | */ |
d06245b8 | 23 | |
d38dd64a CB |
24 | #ifndef _GNU_SOURCE |
25 | #define _GNU_SOURCE 1 | |
26 | #endif | |
27 | #include <errno.h> | |
28 | #include <fcntl.h> | |
0ad19a3f | 29 | #include <stdio.h> |
0ad19a3f | 30 | #include <stdlib.h> |
0ad19a3f | 31 | #include <string.h> |
0ad19a3f | 32 | #include <sys/param.h> |
d38dd64a CB |
33 | #include <sys/types.h> |
34 | #include <unistd.h> | |
0ad19a3f | 35 | |
2202afc9 | 36 | #include "cgroup.h" |
974a8aba | 37 | #include "commands.h" |
d38dd64a | 38 | #include "config.h" |
e2bcd7db | 39 | #include "error.h" |
f2363e38 | 40 | #include "log.h" |
4fb3cba5 | 41 | #include "lxc.h" |
fd5838e5 | 42 | #include "monitor.h" |
fd5838e5 | 43 | #include "state.h" |
37ef15bb | 44 | #include "string_utils.h" |
36eb9bde | 45 | |
ac2cecc4 | 46 | lxc_log_define(freezer, lxc); |
0ad19a3f | 47 | |
5a087e05 CB |
48 | static int do_freeze_thaw(bool freeze, struct lxc_conf *conf, const char *name, |
49 | const char *lxcpath) | |
4fb3cba5 | 50 | { |
fd5838e5 | 51 | int ret; |
4fb3cba5 | 52 | char v[100]; |
2202afc9 | 53 | struct cgroup_ops *cgroup_ops; |
4fb3cba5 | 54 | const char *state = freeze ? "FROZEN" : "THAWED"; |
974a8aba CB |
55 | size_t state_len = 6; |
56 | lxc_state_t new_state = freeze ? FROZEN : THAWED; | |
4fb3cba5 | 57 | |
5a087e05 | 58 | cgroup_ops = cgroup_init(conf); |
2202afc9 CB |
59 | if (!cgroup_ops) |
60 | return -1; | |
61 | ||
62 | ret = cgroup_ops->set(cgroup_ops, "freezer.state", state, name, lxcpath); | |
fd5838e5 | 63 | if (ret < 0) { |
2202afc9 | 64 | cgroup_exit(cgroup_ops); |
fd5838e5 | 65 | ERROR("Failed to freeze %s", name); |
4fb3cba5 DE |
66 | return -1; |
67 | } | |
fd5838e5 CB |
68 | |
69 | for (;;) { | |
2202afc9 | 70 | ret = cgroup_ops->get(cgroup_ops, "freezer.state", v, sizeof(v), name, lxcpath); |
fd5838e5 | 71 | if (ret < 0) { |
2202afc9 | 72 | cgroup_exit(cgroup_ops); |
fd5838e5 | 73 | ERROR("Failed to get freezer state of %s", name); |
4fb3cba5 DE |
74 | return -1; |
75 | } | |
fd5838e5 CB |
76 | |
77 | v[99] = '\0'; | |
78 | v[lxc_char_right_gc(v, strlen(v))] = '\0'; | |
79 | ||
974a8aba | 80 | ret = strncmp(v, state, state_len); |
fd5838e5 | 81 | if (ret == 0) { |
2202afc9 | 82 | cgroup_exit(cgroup_ops); |
974a8aba CB |
83 | lxc_cmd_serve_state_clients(name, lxcpath, new_state); |
84 | lxc_monitor_send_state(name, new_state, lxcpath); | |
4fb3cba5 DE |
85 | return 0; |
86 | } | |
fd5838e5 | 87 | |
4fb3cba5 DE |
88 | sleep(1); |
89 | } | |
90 | } | |
ae5c8b8e | 91 | |
5a087e05 | 92 | int lxc_freeze(struct lxc_conf *conf, const char *name, const char *lxcpath) |
0ad19a3f | 93 | { |
974a8aba | 94 | lxc_cmd_serve_state_clients(name, lxcpath, FREEZING); |
9123e471 | 95 | lxc_monitor_send_state(name, FREEZING, lxcpath); |
5a087e05 | 96 | return do_freeze_thaw(true, conf, name, lxcpath); |
0ad19a3f | 97 | } |
98 | ||
5a087e05 | 99 | int lxc_unfreeze(struct lxc_conf *conf, const char *name, const char *lxcpath) |
0ad19a3f | 100 | { |
5a087e05 | 101 | return do_freeze_thaw(false, conf, name, lxcpath); |
0ad19a3f | 102 | } |