87 lines
1.3 KiB
C
87 lines
1.3 KiB
C
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/*
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* Common RTC functions
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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 rtc_adjtime_is_utc(void)
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{
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int utc = 0;
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FILE *f = fopen(ADJTIME_PATH, "r");
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if (f) {
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RESERVE_CONFIG_BUFFER(buffer, 128);
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while (fgets(buffer, sizeof(buffer), f)) {
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int len = strlen(buffer);
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while (len && isspace(buffer[len - 1]))
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len--;
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buffer[len] = 0;
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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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RELEASE_CONFIG_BUFFER(buffer);
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}
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return utc;
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}
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int 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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rtc = open("/dev/rtc", flags);
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if (rtc >= 0)
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return rtc;
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rtc = open("/dev/rtc0", 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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time_t rtc_read_time(int fd, int utc)
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{
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struct tm tm;
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char *oldtz = 0;
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time_t t = 0;
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memset(&tm, 0, sizeof(struct tm));
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xioctl(fd, RTC_RD_TIME, &tm);
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tm.tm_isdst = -1; /* not known */
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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(&tm);
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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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