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Commit | Line | Data |
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576f946d | 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 <mntent.h> | |
29 | #include <unistd.h> | |
30 | #include <string.h> | |
31 | #include <fcntl.h> | |
32 | #include <sys/types.h> | |
33 | #include <sys/stat.h> | |
34 | #include <sys/param.h> | |
35 | #include <sys/inotify.h> | |
36 | #include <netinet/in.h> | |
37 | #include <net/if.h> | |
38 | ||
e2bcd7db | 39 | #include "error.h" |
36eb9bde | 40 | |
576f946d | 41 | #include <lxc/lxc.h> |
36eb9bde CLG |
42 | #include <lxc/log.h> |
43 | ||
44 | lxc_log_define(lxc_cgroup, lxc); | |
576f946d | 45 | |
46 | #define MTAB "/etc/mtab" | |
47 | ||
48 | static int get_cgroup_mount(const char *mtab, char *mnt) | |
49 | { | |
50 | struct mntent *mntent; | |
51 | FILE *file = NULL; | |
52 | int err = -1; | |
53 | ||
54 | file = setmntent(mtab, "r"); | |
55 | if (!file) { | |
36eb9bde | 56 | SYSERROR("failed to open %s", mtab); |
576f946d | 57 | goto out; |
58 | } | |
59 | ||
60 | while ((mntent = getmntent(file))) { | |
61 | if (strcmp(mntent->mnt_type, "cgroup")) | |
62 | continue; | |
63 | strcpy(mnt, mntent->mnt_dir); | |
64 | err = 0; | |
65 | break; | |
66 | }; | |
67 | ||
68 | fclose(file); | |
69 | out: | |
70 | return err; | |
71 | } | |
72 | ||
73 | int lxc_link_nsgroup(const char *name, pid_t pid) | |
74 | { | |
75 | char lxc[MAXPATHLEN]; | |
76 | char nsgroup[MAXPATHLEN]; | |
77 | char cgroup[MAXPATHLEN]; | |
78 | int ret; | |
79 | ||
80 | if (get_cgroup_mount(MTAB, cgroup)) { | |
36eb9bde | 81 | INFO("cgroup is not mounted"); |
576f946d | 82 | return -1; |
83 | } | |
84 | ||
85 | snprintf(lxc, MAXPATHLEN, LXCPATH "/%s/nsgroup", name); | |
86 | snprintf(nsgroup, MAXPATHLEN, "%s/%d", cgroup, pid); | |
87 | ||
88 | unlink(lxc); | |
89 | ret = symlink(nsgroup, lxc); | |
90 | if (ret) | |
36eb9bde | 91 | SYSERROR("failed to create symlink %s->%s", |
576f946d | 92 | nsgroup, lxc); |
93 | return ret; | |
94 | } | |
95 | ||
96 | int lxc_unlink_nsgroup(const char *name) | |
97 | { | |
98 | char nsgroup[MAXPATHLEN]; | |
4e2121f5 | 99 | char path[MAXPATHLEN]; |
576f946d | 100 | |
101 | snprintf(nsgroup, MAXPATHLEN, LXCPATH "/%s/nsgroup", name); | |
4e2121f5 | 102 | |
103 | if (readlink(nsgroup, path, MAXPATHLEN) > 0) | |
104 | rmdir(path); | |
105 | ||
576f946d | 106 | return unlink(nsgroup); |
107 | } | |
108 | ||
576f946d | 109 | int lxc_cgroup_set(const char *name, const char *subsystem, const char *value) |
110 | { | |
e2bcd7db | 111 | int fd, ret = -LXC_ERROR_INTERNAL;; |
576f946d | 112 | char path[MAXPATHLEN]; |
113 | ||
114 | snprintf(path, MAXPATHLEN, LXCPATH "/%s/nsgroup/%s", name, subsystem); | |
115 | ||
116 | fd = open(path, O_WRONLY); | |
117 | if (fd < 0) | |
118 | return -1; | |
119 | ||
120 | if (write(fd, value, strlen(value)) < 0) | |
121 | goto out; | |
122 | ||
123 | ret = 0; | |
124 | out: | |
125 | close(fd); | |
126 | return ret; | |
127 | } | |
128 | ||
129 | int lxc_cgroup_get(const char *name, const char *subsystem, | |
130 | char *value, size_t len) | |
131 | { | |
e2bcd7db | 132 | int fd, ret = -LXC_ERROR_INTERNAL; |
576f946d | 133 | char path[MAXPATHLEN]; |
134 | ||
135 | snprintf(path, MAXPATHLEN, LXCPATH "/%s/nsgroup/%s", name, subsystem); | |
136 | ||
137 | fd = open(path, O_RDONLY); | |
138 | if (fd < 0) | |
139 | return -1; | |
140 | ||
141 | if (read(fd, value, len) < 0) | |
142 | goto out; | |
143 | ||
144 | ret = 0; | |
145 | out: | |
146 | close(fd); | |
147 | return ret; | |
148 | } |