85 lines
2.5 KiB
C
85 lines
2.5 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 2014 Ivan Shapovalov
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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 <errno.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include "alloc-util.h"
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#include "fileio.h"
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#include "log.h"
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#include "util.h"
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int main(int argc, char *argv[]) {
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struct stat st;
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const char *device;
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_cleanup_free_ char *major_minor = NULL;
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int r;
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if (argc != 2) {
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log_error("This program expects one argument.");
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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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/* Refuse to run unless we are in an initrd() */
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if (!in_initrd())
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return EXIT_SUCCESS;
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device = argv[1];
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if (stat(device, &st) < 0) {
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log_error_errno(errno, "Failed to stat '%s': %m", device);
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return EXIT_FAILURE;
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}
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if (!S_ISBLK(st.st_mode)) {
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log_error("Resume device '%s' is not a block device.", device);
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return EXIT_FAILURE;
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}
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if (asprintf(&major_minor, "%d:%d", major(st.st_rdev), minor(st.st_rdev)) < 0) {
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log_oom();
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return EXIT_FAILURE;
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}
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r = write_string_file("/sys/power/resume", major_minor, WRITE_STRING_FILE_CREATE);
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if (r < 0) {
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log_error_errno(r, "Failed to write '%s' to /sys/power/resume: %m", major_minor);
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return EXIT_FAILURE;
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}
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/*
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* The write above shall not return.
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*
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* However, failed resume is a normal condition (may mean that there is
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* no hibernation image).
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*/
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log_info("Could not resume from '%s' (%s).", device, major_minor);
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return EXIT_SUCCESS;
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}
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