| /* 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; |
| } |