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0ad19a3f | 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 | #define _GNU_SOURCE | |
24 | #include <stdio.h> | |
25 | #undef _GNU_SOURCE | |
26 | #include <stdlib.h> | |
27 | #include <errno.h> | |
28 | #include <unistd.h> | |
29 | #include <string.h> | |
30 | #include <fcntl.h> | |
31 | #include <sys/types.h> | |
0ad19a3f | 32 | #include <sys/param.h> |
0ad19a3f | 33 | |
e2bcd7db | 34 | #include "error.h" |
00b3c2e2 | 35 | |
36eb9bde | 36 | #include <lxc/log.h> |
00b3c2e2 | 37 | #include <lxc/cgroup.h> |
36eb9bde CLG |
38 | |
39 | lxc_log_define(lxc_freezer, lxc); | |
0ad19a3f | 40 | |
41 | static int freeze_unfreeze(const char *name, int freeze) | |
42 | { | |
14ad6bfd | 43 | char *nsgroup; |
84701151 | 44 | char freezer[MAXPATHLEN], *f; |
14ad6bfd | 45 | int fd, ret; |
0ad19a3f | 46 | |
14ad6bfd MN |
47 | ret = lxc_cgroup_path_get(&nsgroup, name); |
48 | if (ret) | |
49 | return -1; | |
50 | ||
51 | snprintf(freezer, MAXPATHLEN, "%s/freezer.state", nsgroup); | |
0ad19a3f | 52 | |
53 | fd = open(freezer, O_WRONLY); | |
54 | if (fd < 0) { | |
36eb9bde | 55 | SYSERROR("failed to open freezer for '%s'", name); |
06efeb5c | 56 | return -1; |
0ad19a3f | 57 | } |
58 | ||
84701151 | 59 | if (freeze) { |
60 | f = "FROZEN"; | |
61 | ret = write(fd, f, strlen(f) + 1) < 0; | |
62 | } else { | |
63 | f = "THAWED"; | |
64 | ret = write(fd, f, strlen(f) + 1) < 0; | |
65 | ||
66 | /* compatibility code with old freezer interface */ | |
67 | if (ret) { | |
68 | f = "RUNNING"; | |
69 | ret = write(fd, f, strlen(f) + 1) < 0; | |
70 | } | |
71 | } | |
72 | ||
0ad19a3f | 73 | close(fd); |
74 | if (ret) | |
36eb9bde | 75 | SYSERROR("failed to write to '%s'", freezer); |
06efeb5c | 76 | |
14ad6bfd | 77 | return ret; |
0ad19a3f | 78 | } |
79 | ||
80 | int lxc_freeze(const char *name) | |
81 | { | |
66aeffc7 | 82 | return freeze_unfreeze(name, 1); |
0ad19a3f | 83 | } |
84 | ||
85 | int lxc_unfreeze(const char *name) | |
86 | { | |
66aeffc7 | 87 | return freeze_unfreeze(name, 0); |
0ad19a3f | 88 | } |
89 |