diff options
Diffstat (limited to 'lib/monotonic.c')
| -rw-r--r-- | lib/monotonic.c | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/lib/monotonic.c b/lib/monotonic.c new file mode 100644 index 0000000..bb58e15 --- /dev/null +++ b/lib/monotonic.c @@ -0,0 +1,70 @@ +/* + * Please, don't add this file to libcommon because clock_gettime() requires + * -lrt on systems with old libc. + */ +#include <time.h> +#include <signal.h> +#ifdef HAVE_SYSINFO +#include <sys/sysinfo.h> +#endif +#include <sys/time.h> + +#include "c.h" +#include "monotonic.h" + +int get_boot_time(struct timeval *boot_time) +{ +#ifdef CLOCK_BOOTTIME + struct timespec hires_uptime; + struct timeval lores_uptime; +#endif + struct timeval now; +#ifdef HAVE_SYSINFO + struct sysinfo info; +#endif + + if (gettimeofday(&now, NULL) != 0) + return -errno; +#ifdef CLOCK_BOOTTIME + if (clock_gettime(CLOCK_BOOTTIME, &hires_uptime) == 0) { + TIMESPEC_TO_TIMEVAL(&lores_uptime, &hires_uptime); + timersub(&now, &lores_uptime, boot_time); + return 0; + } +#endif +#ifdef HAVE_SYSINFO + /* fallback */ + if (sysinfo(&info) != 0) + return -errno; + + boot_time->tv_sec = now.tv_sec - info.uptime; + boot_time->tv_usec = 0; + return 0; +#else + return -ENOSYS; +#endif +} + +int gettime_monotonic(struct timeval *tv) +{ +#ifdef CLOCK_MONOTONIC + /* Can slew only by ntp and adjtime */ + int ret; + struct timespec ts; + +# ifdef CLOCK_MONOTONIC_RAW + /* Linux specific, can't slew */ + if (!(ret = clock_gettime(CLOCK_MONOTONIC_RAW, &ts))) { +# else + if (!(ret = clock_gettime(CLOCK_MONOTONIC, &ts))) { +# endif + tv->tv_sec = ts.tv_sec; + tv->tv_usec = ts.tv_nsec / 1000; + } + return ret; +#else + return gettimeofday(tv, NULL); +#endif +} + + |