From 6b160e490d4d77596c1603d34d0a1ca0579a82da Mon Sep 17 00:00:00 2001 From: Mike Frysinger Date: Fri, 15 Feb 2008 02:27:19 +0000 Subject: split some rtc funcs out of hwclock and into an rtc header/lib so that the new rtcwake applet as well as hwclock can utilize the same code --- libbb/rtc.c | 86 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 86 insertions(+) create mode 100644 libbb/rtc.c (limited to 'libbb/rtc.c') diff --git a/libbb/rtc.c b/libbb/rtc.c new file mode 100644 index 000000000..4cbf32206 --- /dev/null +++ b/libbb/rtc.c @@ -0,0 +1,86 @@ +/* + * Common RTC functions + */ + +#include "libbb.h" +#include "rtc_.h" + +#if ENABLE_FEATURE_HWCLOCK_ADJTIME_FHS +# define ADJTIME_PATH "/var/lib/hwclock/adjtime" +#else +# define ADJTIME_PATH "/etc/adjtime" +#endif + +int rtc_adjtime_is_utc(void) +{ + int utc = 0; + FILE *f = fopen(ADJTIME_PATH, "r"); + + if (f) { + RESERVE_CONFIG_BUFFER(buffer, 128); + + while (fgets(buffer, sizeof(buffer), f)) { + int len = strlen(buffer); + + while (len && isspace(buffer[len - 1])) + len--; + + buffer[len] = 0; + + if (strncmp(buffer, "UTC", 3) == 0) { + utc = 1; + break; + } + } + fclose(f); + + RELEASE_CONFIG_BUFFER(buffer); + } + + return utc; +} + +int rtc_xopen(const char *default_rtc, int flags) +{ + int rtc; + + if (!default_rtc) { + rtc = open("/dev/rtc", flags); + if (rtc >= 0) + return rtc; + rtc = open("/dev/rtc0", flags); + if (rtc >= 0) + return rtc; + default_rtc = "/dev/misc/rtc"; + } + + return xopen(default_rtc, flags); +} + +time_t rtc_read_time(int fd, int utc) +{ + struct tm tm; + char *oldtz = 0; + time_t t = 0; + + memset(&tm, 0, sizeof(struct tm)); + xioctl(fd, RTC_RD_TIME, &tm); + tm.tm_isdst = -1; /* not known */ + + if (utc) { + oldtz = getenv("TZ"); + putenv((char*)"TZ=UTC0"); + tzset(); + } + + t = mktime(&tm); + + if (utc) { + unsetenv("TZ"); + if (oldtz) + putenv(oldtz - 3); + tzset(); + } + + return t; +} -- cgit v1.2.3