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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2014 Ivan Shapovalov
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include "log.h"
#include "util.h"
#include "fileio.h"
int main(int argc, char *argv[]) {
struct stat st;
const char *device;
_cleanup_free_ char *major_minor = NULL;
int r;
if (argc != 2) {
log_error("This program expects one argument.");
return EXIT_FAILURE;
}
log_set_target(LOG_TARGET_AUTO);
log_parse_environment();
log_open();
umask(0022);
/* Refuse to run unless we are in an initrd() */
if (!in_initrd())
return EXIT_SUCCESS;
device = argv[1];
if (stat(device, &st) < 0) {
log_error("Failed to stat '%s': %m", device);
return EXIT_FAILURE;
}
if (!S_ISBLK(st.st_mode)) {
log_error("Resume device '%s' is not a block device.", device);
return EXIT_FAILURE;
}
if (asprintf(&major_minor, "%d:%d", major(st.st_rdev), minor(st.st_rdev)) < 0) {
log_oom();
return EXIT_FAILURE;
}
r = write_string_file("/sys/power/resume", major_minor);
if (r < 0) {
log_error_errno(-r, "Failed to write '%s' to /sys/power/resume: %m", major_minor);
return EXIT_FAILURE;
}
/*
* The write above shall not return.
*
* However, failed resume is a normal condition (may mean that there is
* no hibernation image).
*/
log_info("Could not resume from '%s' (%s).", device, major_minor);
return EXIT_SUCCESS;
}
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