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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <stdio.h>
#include <sys/stat.h>
#include "alloc-util.h"
#include "devnum-util.h"
#include "fileio.h"
#include "initrd-util.h"
#include "log.h"
int main(int argc, char *argv[]) {
struct stat st;
const char *device;
int r;
if (argc != 2) {
log_error("This program expects one argument.");
return EXIT_FAILURE;
}
log_setup();
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_errno(errno, "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;
}
r = write_string_file("/sys/power/resume", FORMAT_DEVNUM(st.st_rdev), WRITE_STRING_FILE_DISABLE_BUFFER);
if (r < 0) {
log_error_errno(r, "Failed to write '" DEVNUM_FORMAT_STR "' to /sys/power/resume: %m", DEVNUM_FORMAT_VAL(st.st_rdev));
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' (" DEVNUM_FORMAT_STR ").", device, DEVNUM_FORMAT_VAL(st.st_rdev));
return EXIT_SUCCESS;
}
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