[3320] | 1 | /*
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| 2 | * Common RTC functions
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| 3 | *
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| 4 | * Licensed under GPLv2, see file LICENSE in this source tree.
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| 5 | */
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| 6 |
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| 7 | #include "libbb.h"
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| 8 | #include "rtc_.h"
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| 9 |
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| 10 | #if ENABLE_FEATURE_HWCLOCK_ADJTIME_FHS
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| 11 | # define ADJTIME_PATH "/var/lib/hwclock/adjtime"
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| 12 | #else
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| 13 | # define ADJTIME_PATH "/etc/adjtime"
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| 14 | #endif
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| 15 |
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| 16 | int FAST_FUNC rtc_adjtime_is_utc(void)
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| 17 | {
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| 18 | int utc = 0;
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| 19 | FILE *f = fopen_for_read(ADJTIME_PATH);
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| 20 |
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| 21 | if (f) {
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| 22 | char buffer[128];
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| 23 |
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| 24 | while (fgets(buffer, sizeof(buffer), f)) {
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| 25 | if (strncmp(buffer, "UTC", 3) == 0) {
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| 26 | utc = 1;
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| 27 | break;
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| 28 | }
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| 29 | }
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| 30 | fclose(f);
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| 31 | }
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| 32 |
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| 33 | return utc;
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| 34 | }
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| 35 |
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| 36 | int FAST_FUNC rtc_xopen(const char **default_rtc, int flags)
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| 37 | {
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| 38 | int rtc;
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| 39 |
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| 40 | if (!*default_rtc) {
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| 41 | *default_rtc = "/dev/rtc";
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| 42 | rtc = open(*default_rtc, flags);
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| 43 | if (rtc >= 0)
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| 44 | return rtc;
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| 45 | *default_rtc = "/dev/rtc0";
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| 46 | rtc = open(*default_rtc, flags);
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| 47 | if (rtc >= 0)
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| 48 | return rtc;
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| 49 | *default_rtc = "/dev/misc/rtc";
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| 50 | }
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| 51 |
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| 52 | return xopen(*default_rtc, flags);
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| 53 | }
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| 54 |
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| 55 | void FAST_FUNC rtc_read_tm(struct tm *ptm, int fd)
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| 56 | {
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| 57 | memset(ptm, 0, sizeof(*ptm));
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| 58 | xioctl(fd, RTC_RD_TIME, ptm);
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| 59 | ptm->tm_isdst = -1; /* "not known" */
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| 60 | }
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| 61 |
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| 62 | time_t FAST_FUNC rtc_tm2time(struct tm *ptm, int utc)
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| 63 | {
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| 64 | char *oldtz = oldtz; /* for compiler */
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| 65 | time_t t;
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| 66 |
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| 67 | if (utc) {
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| 68 | oldtz = getenv("TZ");
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| 69 | putenv((char*)"TZ=UTC0");
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| 70 | tzset();
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| 71 | }
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| 72 |
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| 73 | t = mktime(ptm);
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| 74 |
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| 75 | if (utc) {
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| 76 | unsetenv("TZ");
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| 77 | if (oldtz)
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| 78 | putenv(oldtz - 3);
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| 79 | tzset();
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| 80 | }
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| 81 |
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| 82 | return t;
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| 83 | }
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