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git.ipfire.org Git - thirdparty/systemd.git/blob - src/ac-power.c
1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
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
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
30 static int on_ac_power(void) {
34 struct udev_enumerate
*e
= NULL
;
35 struct udev_list_entry
*item
= NULL
, *first
= NULL
;
36 bool found_offline
= false, found_online
= false;
38 if (!(udev
= udev_new())) {
43 if (!(e
= udev_enumerate_new(udev
))) {
48 if (udev_enumerate_add_match_subsystem(e
, "power_supply") < 0) {
53 if (udev_enumerate_scan_devices(e
) < 0) {
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
;
63 if (!(d
= udev_device_new_from_syspath(udev
, udev_list_entry_get_name(item
)))) {
68 if (!(type
= udev_device_get_sysattr_value(d
, "type")))
71 if (!streq(type
, "Mains"))
74 if (!(online
= udev_device_get_sysattr_value(d
, "online")))
77 if (streq(online
, "1")) {
80 } else if (streq(online
, "0"))
87 r
= found_online
|| !found_offline
;
91 udev_enumerate_unref(e
);
99 int main(int argc
, char *argv
[]) {
102 /* This is mostly intended to be used for scripts which want
103 * to detect whether AC power is plugged in or not. */
105 if ((r
= on_ac_power()) < 0) {
106 log_error("Failed to read AC status: %s", strerror(-r
));