Contents of /trunk/mkinitrd-magellan/klibc/usr/kinit/resume/resumelib.c
Parent Directory | Revision Log
Revision 1122 -
(show annotations)
(download)
Wed Aug 18 21:11:40 2010 UTC (14 years, 1 month ago) by niro
File MIME type: text/plain
File size: 2080 byte(s)
Wed Aug 18 21:11:40 2010 UTC (14 years, 1 month ago) by niro
File MIME type: text/plain
File size: 2080 byte(s)
-updated to klibc-1.5.19
1 | /* |
2 | * Handle resume from suspend-to-disk |
3 | */ |
4 | |
5 | #include <errno.h> |
6 | #include <fcntl.h> |
7 | #include <stdio.h> |
8 | #include <stdlib.h> |
9 | #include <string.h> |
10 | #include <limits.h> |
11 | #include <sys/stat.h> |
12 | #include <sys/sysmacros.h> |
13 | |
14 | #include "kinit.h" |
15 | #include "do_mounts.h" |
16 | #include "resume.h" |
17 | |
18 | #ifndef CONFIG_PM_STD_PARTITION |
19 | # define CONFIG_PM_STD_PARTITION "" |
20 | #endif |
21 | |
22 | int do_resume(int argc, char *argv[]) |
23 | { |
24 | const char *resume_file = CONFIG_PM_STD_PARTITION; |
25 | const char *resume_arg; |
26 | unsigned long long resume_offset; |
27 | |
28 | resume_arg = get_arg(argc, argv, "resume="); |
29 | resume_file = resume_arg ? resume_arg : resume_file; |
30 | /* No resume device specified */ |
31 | if (!resume_file[0]) |
32 | return 0; |
33 | |
34 | resume_arg = get_arg(argc, argv, "resume_offset="); |
35 | resume_offset = resume_arg ? strtoull(resume_arg, NULL, 0) : 0ULL; |
36 | |
37 | /* Fix: we either should consider reverting the device back to |
38 | ordinary swap, or (better) put that code into swapon */ |
39 | /* Noresume requested */ |
40 | if (get_flag(argc, argv, "noresume")) |
41 | return 0; |
42 | return resume(resume_file, resume_offset); |
43 | } |
44 | |
45 | int resume(const char *resume_file, unsigned long long resume_offset) |
46 | { |
47 | dev_t resume_device; |
48 | int powerfd = -1; |
49 | char device_string[64]; |
50 | int len; |
51 | |
52 | resume_device = name_to_dev_t(resume_file); |
53 | |
54 | if (major(resume_device) == 0) { |
55 | fprintf(stderr, "Invalid resume device: %s\n", resume_file); |
56 | goto failure; |
57 | } |
58 | |
59 | if ((powerfd = open("/sys/power/resume", O_WRONLY)) < 0) |
60 | goto fail_r; |
61 | |
62 | len = snprintf(device_string, sizeof device_string, |
63 | "%u:%u:%llu", |
64 | major(resume_device), minor(resume_device), |
65 | resume_offset); |
66 | |
67 | /* This should never happen */ |
68 | if (len >= sizeof device_string) |
69 | goto fail_r; |
70 | |
71 | dprintf("kinit: trying to resume from %s\n", resume_file); |
72 | |
73 | if (write(powerfd, device_string, len) != len) |
74 | goto fail_r; |
75 | |
76 | /* Okay, what are we still doing alive... */ |
77 | failure: |
78 | if (powerfd >= 0) |
79 | close(powerfd); |
80 | dprintf("kinit: No resume image, doing normal boot...\n"); |
81 | return -1; |
82 | |
83 | fail_r: |
84 | fprintf(stderr, "Cannot write /sys/power/resume " |
85 | "(no software suspend kernel support?)\n"); |
86 | goto failure; |
87 | } |