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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