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5e97c3fc | 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 | #include <stdio.h> | |
0ad19a3f | 24 | #include <string.h> |
25 | #include <fcntl.h> | |
26 | #include <errno.h> | |
5e97c3fc | 27 | #include <unistd.h> |
5e97c3fc | 28 | #include <sys/types.h> |
0ad19a3f | 29 | #include <sys/types.h> |
30 | #include <sys/param.h> | |
31 | #include <sys/stat.h> | |
32 | #include <sys/file.h> | |
5e97c3fc | 33 | |
b113348e | 34 | #include <lxc/lxc.h> |
36eb9bde | 35 | #include <lxc/log.h> |
e98fe68b | 36 | #include "commands.h" |
36eb9bde CLG |
37 | |
38 | lxc_log_define(lxc_state, lxc); | |
0ad19a3f | 39 | |
40 | static char *strstate[] = { | |
41 | "STOPPED", "STARTING", "RUNNING", "STOPPING", | |
42 | "ABORTING", "FREEZING", "FROZEN", | |
43 | }; | |
44 | ||
45 | const char *lxc_state2str(lxc_state_t state) | |
46 | { | |
47 | if (state < STOPPED || state > MAX_STATE - 1) | |
48 | return NULL; | |
49 | return strstate[state]; | |
50 | } | |
5e97c3fc | 51 | |
0ad19a3f | 52 | lxc_state_t lxc_str2state(const char *state) |
5e97c3fc | 53 | { |
0ad19a3f | 54 | int i, len; |
55 | len = sizeof(strstate)/sizeof(strstate[0]); | |
56 | for (i = 0; i < len; i++) | |
57 | if (!strcmp(strstate[i], state)) | |
58 | return i; | |
3ab87b66 | 59 | |
439358bf | 60 | ERROR("invalid state '%s'", state); |
0ad19a3f | 61 | return -1; |
5e97c3fc | 62 | } |
63 | ||
0ad19a3f | 64 | int lxc_rmstate(const char *name) |
65 | { | |
66 | char file[MAXPATHLEN]; | |
67 | snprintf(file, MAXPATHLEN, LXCPATH "/%s/state", name); | |
68 | unlink(file); | |
5e97c3fc | 69 | return 0; |
70 | } | |
71 | ||
0ad19a3f | 72 | static int freezer_state(const char *name) |
73 | { | |
74 | char freezer[MAXPATHLEN]; | |
75 | char status[MAXPATHLEN]; | |
76 | FILE *file; | |
77 | int err; | |
35d2c3e7 | 78 | |
0ad19a3f | 79 | snprintf(freezer, MAXPATHLEN, |
70a59143 | 80 | LXCPATH "/%s/freezer.state", name); |
0ad19a3f | 81 | |
82 | file = fopen(freezer, "r"); | |
83 | if (!file) | |
84 | return -1; | |
85 | ||
86 | err = fscanf(file, "%s", status); | |
87 | fclose(file); | |
88 | ||
89 | if (err == EOF) { | |
36eb9bde | 90 | SYSERROR("failed to read %s", freezer); |
0ad19a3f | 91 | return -1; |
92 | } | |
93 | ||
94 | return lxc_str2state(status); | |
95 | } | |
96 | ||
e98fe68b DL |
97 | lxc_state_t lxc_getstate(const char *name) |
98 | { | |
99 | struct lxc_command command = { | |
100 | .request = { .type = LXC_COMMAND_STATE }, | |
101 | }; | |
102 | ||
103 | int ret; | |
104 | ||
105 | ret = lxc_command(name, &command); | |
106 | if (ret < 0) { | |
107 | ERROR("failed to send command"); | |
108 | return -1; | |
109 | } | |
110 | ||
111 | if (!ret) { | |
112 | WARN("'%s' has stopped before sending its state", name); | |
113 | return -1; | |
114 | } | |
115 | ||
116 | if (command.answer.ret < 0) { | |
117 | ERROR("failed to get state for '%s': %s", | |
118 | name, strerror(-command.answer.ret)); | |
119 | return -1; | |
120 | } | |
121 | ||
122 | DEBUG("'%s' is in '%s' state", name, lxc_state2str(command.answer.ret)); | |
123 | ||
124 | return command.answer.ret; | |
125 | } | |
126 | ||
0ad19a3f | 127 | lxc_state_t lxc_state(const char *name) |
128 | { | |
129 | int state = freezer_state(name); | |
130 | if (state != FROZEN && state != FREEZING) | |
131 | state = lxc_getstate(name); | |
132 | return state; | |
133 | } | |
e98fe68b DL |
134 | |
135 | /*---------------------------------------------------------------------------- | |
136 | * functions used by lxc-start mainloop | |
137 | * to handle above command request. | |
138 | *--------------------------------------------------------------------------*/ | |
139 | extern int lxc_state_callback(int fd, struct lxc_request *request, | |
140 | struct lxc_handler *handler) | |
141 | { | |
142 | struct lxc_answer answer; | |
143 | int ret; | |
144 | ||
145 | answer.ret = handler->state; | |
146 | ||
147 | ret = send(fd, &answer, sizeof(answer), 0); | |
148 | if (ret < 0) { | |
149 | WARN("failed to send answer to the peer"); | |
150 | goto out; | |
151 | } | |
152 | ||
153 | if (ret != sizeof(answer)) { | |
154 | ERROR("partial answer sent"); | |
155 | goto out; | |
156 | } | |
157 | ||
158 | out: | |
159 | return ret; | |
160 | } | |
161 |