112 lines
3.0 KiB
C
112 lines
3.0 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <stdlib.h>
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#include <stdbool.h>
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#include <errno.h>
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#include <string.h>
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#include <libudev.h>
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#include "util.h"
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static int on_ac_power(void) {
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int r;
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struct udev *udev;
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struct udev_enumerate *e = NULL;
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struct udev_list_entry *item = NULL, *first = NULL;
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bool found_offline = false, found_online = false;
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if (!(udev = udev_new())) {
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r = -ENOMEM;
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goto finish;
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}
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if (!(e = udev_enumerate_new(udev))) {
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r = -ENOMEM;
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goto finish;
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}
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if (udev_enumerate_add_match_subsystem(e, "power_supply") < 0) {
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r = -EIO;
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goto finish;
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}
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if (udev_enumerate_scan_devices(e) < 0) {
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r = -EIO;
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goto finish;
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}
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first = udev_enumerate_get_list_entry(e);
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udev_list_entry_foreach(item, first) {
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struct udev_device *d;
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const char *type, *online;
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if (!(d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item)))) {
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r = -ENOMEM;
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goto finish;
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}
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if (!(type = udev_device_get_sysattr_value(d, "type")))
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goto next;
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if (!streq(type, "Mains"))
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goto next;
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if (!(online = udev_device_get_sysattr_value(d, "online")))
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goto next;
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if (streq(online, "1")) {
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found_online = true;
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break;
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} else if (streq(online, "0"))
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found_offline = true;
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next:
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udev_device_unref(d);
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}
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r = found_online || !found_offline;
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finish:
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if (e)
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udev_enumerate_unref(e);
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if (udev)
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udev_unref(udev);
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return r;
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}
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int main(int argc, char *argv[]) {
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int r;
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/* This is mostly intended to be used for scripts which want
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* to detect whether AC power is plugged in or not. */
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if ((r = on_ac_power()) < 0) {
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log_error("Failed to read AC status: %s", strerror(-r));
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return EXIT_FAILURE;
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}
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return r == 0;
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}
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