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/* SPDX-License-Identifier: LGPL-2.1+ */
#include <errno.h>
#include <stdio.h>
#include <sys/stat.h>
#include "alloc-util.h"
#include "fileio.h"
#include "log.h"
#include "util.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_setup_service();
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;
}
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, WRITE_STRING_FILE_DISABLE_BUFFER);
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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