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1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
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9 | under the terms of the GNU Lesser General Public License as published by |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
3d20ed6d LP |
11 | (at your option) any later version. |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 16 | Lesser General Public License for more details. |
3d20ed6d | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
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19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
22 | #include <stdlib.h> | |
23 | #include <stdbool.h> | |
24 | #include <errno.h> | |
25 | #include <string.h> | |
26 | #include <libudev.h> | |
27 | ||
28 | #include "util.h" | |
3d20ed6d | 29 | |
06cdd248 | 30 | static int on_ac_power(void) { |
3d20ed6d LP |
31 | int r; |
32 | ||
33 | struct udev *udev; | |
34 | struct udev_enumerate *e = NULL; | |
35 | struct udev_list_entry *item = NULL, *first = NULL; | |
36 | bool found_offline = false, found_online = false; | |
37 | ||
38 | if (!(udev = udev_new())) { | |
39 | r = -ENOMEM; | |
40 | goto finish; | |
41 | } | |
42 | ||
43 | if (!(e = udev_enumerate_new(udev))) { | |
44 | r = -ENOMEM; | |
45 | goto finish; | |
46 | } | |
47 | ||
48 | if (udev_enumerate_add_match_subsystem(e, "power_supply") < 0) { | |
49 | r = -EIO; | |
50 | goto finish; | |
51 | } | |
52 | ||
53 | if (udev_enumerate_scan_devices(e) < 0) { | |
54 | r = -EIO; | |
55 | goto finish; | |
56 | } | |
57 | ||
58 | first = udev_enumerate_get_list_entry(e); | |
59 | udev_list_entry_foreach(item, first) { | |
60 | struct udev_device *d; | |
61 | const char *type, *online; | |
62 | ||
63 | if (!(d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item)))) { | |
64 | r = -ENOMEM; | |
65 | goto finish; | |
66 | } | |
67 | ||
68 | if (!(type = udev_device_get_sysattr_value(d, "type"))) | |
69 | goto next; | |
70 | ||
71 | if (!streq(type, "Mains")) | |
72 | goto next; | |
73 | ||
74 | if (!(online = udev_device_get_sysattr_value(d, "online"))) | |
75 | goto next; | |
76 | ||
77 | if (streq(online, "1")) { | |
78 | found_online = true; | |
79 | break; | |
80 | } else if (streq(online, "0")) | |
81 | found_offline = true; | |
82 | ||
83 | next: | |
84 | udev_device_unref(d); | |
85 | } | |
86 | ||
87 | r = found_online || !found_offline; | |
88 | ||
89 | finish: | |
90 | if (e) | |
91 | udev_enumerate_unref(e); | |
92 | ||
93 | if (udev) | |
94 | udev_unref(udev); | |
95 | ||
96 | return r; | |
97 | } | |
06cdd248 LP |
98 | |
99 | int main(int argc, char *argv[]) { | |
100 | int r; | |
101 | ||
102 | /* This is mostly intended to be used for scripts which want | |
103 | * to detect whether AC power is plugged in or not. */ | |
104 | ||
105 | if ((r = on_ac_power()) < 0) { | |
106 | log_error("Failed to read AC status: %s", strerror(-r)); | |
107 | return EXIT_FAILURE; | |
108 | } | |
109 | ||
110 | return r == 0; | |
111 | } |