64 lines
1.7 KiB
C
64 lines
1.7 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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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_setup_service();
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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_DISABLE_BUFFER);
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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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