summaryrefslogtreecommitdiff
path: root/src/ac-power.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/ac-power.c')
-rw-r--r--src/ac-power.c111
1 files changed, 111 insertions, 0 deletions
diff --git a/src/ac-power.c b/src/ac-power.c
new file mode 100644
index 0000000000..24a68e717e
--- /dev/null
+++ b/src/ac-power.c
@@ -0,0 +1,111 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2010 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <stdlib.h>
+#include <stdbool.h>
+#include <errno.h>
+#include <string.h>
+#include <libudev.h>
+
+#include "util.h"
+
+static int on_ac_power(void) {
+ int r;
+
+ struct udev *udev;
+ struct udev_enumerate *e = NULL;
+ struct udev_list_entry *item = NULL, *first = NULL;
+ bool found_offline = false, found_online = false;
+
+ if (!(udev = udev_new())) {
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ if (!(e = udev_enumerate_new(udev))) {
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ if (udev_enumerate_add_match_subsystem(e, "power_supply") < 0) {
+ r = -EIO;
+ goto finish;
+ }
+
+ if (udev_enumerate_scan_devices(e) < 0) {
+ r = -EIO;
+ goto finish;
+ }
+
+ first = udev_enumerate_get_list_entry(e);
+ udev_list_entry_foreach(item, first) {
+ struct udev_device *d;
+ const char *type, *online;
+
+ if (!(d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item)))) {
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ if (!(type = udev_device_get_sysattr_value(d, "type")))
+ goto next;
+
+ if (!streq(type, "Mains"))
+ goto next;
+
+ if (!(online = udev_device_get_sysattr_value(d, "online")))
+ goto next;
+
+ if (streq(online, "1")) {
+ found_online = true;
+ break;
+ } else if (streq(online, "0"))
+ found_offline = true;
+
+ next:
+ udev_device_unref(d);
+ }
+
+ r = found_online || !found_offline;
+
+finish:
+ if (e)
+ udev_enumerate_unref(e);
+
+ if (udev)
+ udev_unref(udev);
+
+ return r;
+}
+
+int main(int argc, char *argv[]) {
+ int r;
+
+ /* This is mostly intended to be used for scripts which want
+ * to detect whether AC power is plugged in or not. */
+
+ if ((r = on_ac_power()) < 0) {
+ log_error("Failed to read AC status: %s", strerror(-r));
+ return EXIT_FAILURE;
+ }
+
+ return r == 0;
+}