ef5bfcf668
Let's not scatter (private) files in /var around, let's place them all in /var/lib/systemd and below.
133 lines
3.9 KiB
C
133 lines
3.9 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 2013 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 <libudev.h>
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#include "util.h"
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#include "mkdir.h"
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#include "fileio.h"
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int main(int argc, char *argv[]) {
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struct udev *udev = NULL;
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struct udev_device *device = NULL;
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_cleanup_free_ char *saved = NULL;
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int r;
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if (argc != 3) {
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log_error("This program requires two arguments.");
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return EXIT_FAILURE;
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}
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log_set_target(LOG_TARGET_AUTO);
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log_parse_environment();
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log_open();
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umask(0022);
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r = mkdir_p("/var/lib/systemd/backlight", 0755);
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if (r < 0) {
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log_error("Failed to create backlight directory: %s", strerror(-r));
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goto finish;
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}
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udev = udev_new();
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if (!udev) {
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r = log_oom();
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goto finish;
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}
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errno = 0;
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device = udev_device_new_from_subsystem_sysname(udev, "backlight", argv[2]);
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if (!device) {
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if (errno != 0) {
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log_error("Failed to get backlight device: %m");
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r = -errno;
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} else
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r = log_oom();
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goto finish;
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}
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if (!streq_ptr(udev_device_get_subsystem(device), "backlight")) {
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log_error("Not a backlight device: %s", argv[2]);
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r = -ENODEV;
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goto finish;
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}
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saved = strappend("/var/lib/systemd/backlight/", udev_device_get_sysname(device));
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if (!saved) {
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r = log_oom();
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goto finish;
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}
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if (streq(argv[1], "load")) {
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_cleanup_free_ char *value = NULL;
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r = read_one_line_file(saved, &value);
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if (r < 0) {
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if (r == -ENOENT) {
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r = 0;
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goto finish;
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}
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log_error("Failed to read %s: %s", saved, strerror(-r));
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goto finish;
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}
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r = udev_device_set_sysattr_value(device, "brightness", value);
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if (r < 0) {
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log_error("Failed to write system attribute: %s", strerror(-r));
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goto finish;
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}
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} else if (streq(argv[1], "save")) {
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const char *value;
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value = udev_device_get_sysattr_value(device, "brightness");
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if (!value) {
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log_error("Failed to read system attribute: %s", strerror(-r));
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goto finish;
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}
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r = write_string_file(saved, value);
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if (r < 0) {
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log_error("Failed to write %s: %s", saved, strerror(-r));
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goto finish;
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}
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} else {
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log_error("Unknown verb %s.", argv[1]);
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r = -EINVAL;
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goto finish;
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}
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finish:
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if (device)
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udev_device_unref(device);
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if (udev)
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udev_unref(udev);
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return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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