Contents of /tags/mkinitrd-6_3_2/busybox/libbb/rtc.c
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Tue Sep 14 20:33:28 2010 UTC (14 years ago) by niro
File MIME type: text/plain
File size: 1490 byte(s)
Tue Sep 14 20:33:28 2010 UTC (14 years ago) by niro
File MIME type: text/plain
File size: 1490 byte(s)
tagged 'mkinitrd-6_3_2'
1 | /* |
2 | * Common RTC functions |
3 | * |
4 | * Licensed under GPLv2, see file LICENSE in this tarball for details. |
5 | */ |
6 | |
7 | #include "libbb.h" |
8 | #include "rtc_.h" |
9 | |
10 | #if ENABLE_FEATURE_HWCLOCK_ADJTIME_FHS |
11 | # define ADJTIME_PATH "/var/lib/hwclock/adjtime" |
12 | #else |
13 | # define ADJTIME_PATH "/etc/adjtime" |
14 | #endif |
15 | |
16 | int FAST_FUNC rtc_adjtime_is_utc(void) |
17 | { |
18 | int utc = 0; |
19 | FILE *f = fopen_for_read(ADJTIME_PATH); |
20 | |
21 | if (f) { |
22 | char buffer[128]; |
23 | |
24 | while (fgets(buffer, sizeof(buffer), f)) { |
25 | int len = strlen(buffer); |
26 | |
27 | while (len && isspace(buffer[len - 1])) |
28 | len--; |
29 | |
30 | buffer[len] = 0; |
31 | |
32 | if (strncmp(buffer, "UTC", 3) == 0) { |
33 | utc = 1; |
34 | break; |
35 | } |
36 | } |
37 | fclose(f); |
38 | } |
39 | |
40 | return utc; |
41 | } |
42 | |
43 | int FAST_FUNC rtc_xopen(const char **default_rtc, int flags) |
44 | { |
45 | int rtc; |
46 | |
47 | if (!*default_rtc) { |
48 | *default_rtc = "/dev/rtc"; |
49 | rtc = open(*default_rtc, flags); |
50 | if (rtc >= 0) |
51 | return rtc; |
52 | *default_rtc = "/dev/rtc0"; |
53 | rtc = open(*default_rtc, flags); |
54 | if (rtc >= 0) |
55 | return rtc; |
56 | *default_rtc = "/dev/misc/rtc"; |
57 | } |
58 | |
59 | return xopen(*default_rtc, flags); |
60 | } |
61 | |
62 | void FAST_FUNC rtc_read_tm(struct tm *ptm, int fd) |
63 | { |
64 | memset(ptm, 0, sizeof(*ptm)); |
65 | xioctl(fd, RTC_RD_TIME, ptm); |
66 | ptm->tm_isdst = -1; /* "not known" */ |
67 | } |
68 | |
69 | time_t FAST_FUNC rtc_tm2time(struct tm *ptm, int utc) |
70 | { |
71 | char *oldtz = oldtz; /* for compiler */ |
72 | time_t t; |
73 | |
74 | if (utc) { |
75 | oldtz = getenv("TZ"); |
76 | putenv((char*)"TZ=UTC0"); |
77 | tzset(); |
78 | } |
79 | |
80 | t = mktime(ptm); |
81 | |
82 | if (utc) { |
83 | unsetenv("TZ"); |
84 | if (oldtz) |
85 | putenv(oldtz - 3); |
86 | tzset(); |
87 | } |
88 | |
89 | return t; |
90 | } |