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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
42483a74 | 2 | /*** |
96b2fb93 | 3 | Copyright © 2014 Ivan Shapovalov |
42483a74 IS |
4 | ***/ |
5 | ||
42483a74 | 6 | #include <errno.h> |
cf0fbc49 | 7 | #include <stdio.h> |
42483a74 | 8 | #include <sys/stat.h> |
42483a74 | 9 | |
b5efdb8a LP |
10 | #include "alloc-util.h" |
11 | #include "fileio.h" | |
42483a74 IS |
12 | #include "log.h" |
13 | #include "util.h" | |
42483a74 IS |
14 | |
15 | int main(int argc, char *argv[]) { | |
16 | struct stat st; | |
17 | const char *device; | |
18 | _cleanup_free_ char *major_minor = NULL; | |
19 | int r; | |
20 | ||
21 | if (argc != 2) { | |
22 | log_error("This program expects one argument."); | |
23 | return EXIT_FAILURE; | |
24 | } | |
25 | ||
26 | log_set_target(LOG_TARGET_AUTO); | |
27 | log_parse_environment(); | |
28 | log_open(); | |
29 | ||
30 | umask(0022); | |
31 | ||
ac528e3e LP |
32 | /* Refuse to run unless we are in an initrd() */ |
33 | if (!in_initrd()) | |
34 | return EXIT_SUCCESS; | |
35 | ||
42483a74 IS |
36 | device = argv[1]; |
37 | ||
38 | if (stat(device, &st) < 0) { | |
56f64d95 | 39 | log_error_errno(errno, "Failed to stat '%s': %m", device); |
42483a74 IS |
40 | return EXIT_FAILURE; |
41 | } | |
42 | ||
43 | if (!S_ISBLK(st.st_mode)) { | |
44 | log_error("Resume device '%s' is not a block device.", device); | |
45 | return EXIT_FAILURE; | |
46 | } | |
47 | ||
48 | if (asprintf(&major_minor, "%d:%d", major(st.st_rdev), minor(st.st_rdev)) < 0) { | |
49 | log_oom(); | |
50 | return EXIT_FAILURE; | |
51 | } | |
52 | ||
4c1fc3e4 | 53 | r = write_string_file("/sys/power/resume", major_minor, WRITE_STRING_FILE_CREATE); |
42483a74 | 54 | if (r < 0) { |
da927ba9 | 55 | log_error_errno(r, "Failed to write '%s' to /sys/power/resume: %m", major_minor); |
42483a74 IS |
56 | return EXIT_FAILURE; |
57 | } | |
58 | ||
59 | /* | |
60 | * The write above shall not return. | |
61 | * | |
62 | * However, failed resume is a normal condition (may mean that there is | |
63 | * no hibernation image). | |
64 | */ | |
65 | ||
66 | log_info("Could not resume from '%s' (%s).", device, major_minor); | |
67 | return EXIT_SUCCESS; | |
68 | } |