84 lines
1.4 KiB
C
84 lines
1.4 KiB
C
/*
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* Common RTC functions
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*
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* Licensed under GPLv2, see file LICENSE in this tarball for details.
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*/
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#include "libbb.h"
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#include "rtc_.h"
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#if ENABLE_FEATURE_HWCLOCK_ADJTIME_FHS
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# define ADJTIME_PATH "/var/lib/hwclock/adjtime"
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#else
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# define ADJTIME_PATH "/etc/adjtime"
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#endif
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int FAST_FUNC rtc_adjtime_is_utc(void)
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{
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int utc = 0;
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FILE *f = fopen_for_read(ADJTIME_PATH);
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if (f) {
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char buffer[128];
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while (fgets(buffer, sizeof(buffer), f)) {
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if (strncmp(buffer, "UTC", 3) == 0) {
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utc = 1;
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break;
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}
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}
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fclose(f);
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}
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return utc;
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}
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int FAST_FUNC rtc_xopen(const char **default_rtc, int flags)
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{
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int rtc;
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if (!*default_rtc) {
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*default_rtc = "/dev/rtc";
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rtc = open(*default_rtc, flags);
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if (rtc >= 0)
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return rtc;
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*default_rtc = "/dev/rtc0";
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rtc = open(*default_rtc, flags);
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if (rtc >= 0)
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return rtc;
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*default_rtc = "/dev/misc/rtc";
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}
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return xopen(*default_rtc, flags);
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}
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void FAST_FUNC rtc_read_tm(struct tm *ptm, int fd)
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{
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memset(ptm, 0, sizeof(*ptm));
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xioctl(fd, RTC_RD_TIME, ptm);
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ptm->tm_isdst = -1; /* "not known" */
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}
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time_t FAST_FUNC rtc_tm2time(struct tm *ptm, int utc)
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{
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char *oldtz = oldtz; /* for compiler */
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time_t t;
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if (utc) {
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oldtz = getenv("TZ");
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putenv((char*)"TZ=UTC0");
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tzset();
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}
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t = mktime(ptm);
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if (utc) {
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unsetenv("TZ");
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if (oldtz)
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putenv(oldtz - 3);
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tzset();
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}
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return t;
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}
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