70 lines
1.3 KiB
C
70 lines
1.3 KiB
C
/*
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* Please, don't add this file to libcommon because clock_gettime() requires
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* -lrt on systems with old libc.
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*/
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#include <time.h>
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#include <signal.h>
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#ifdef HAVE_SYSINFO
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#include <sys/sysinfo.h>
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#endif
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#include <sys/time.h>
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#include "c.h"
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#include "monotonic.h"
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int get_boot_time(struct timeval *boot_time)
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{
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#ifdef CLOCK_BOOTTIME
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struct timespec hires_uptime;
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struct timeval lores_uptime;
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#endif
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struct timeval now;
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#ifdef HAVE_SYSINFO
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struct sysinfo info;
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#endif
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if (gettimeofday(&now, NULL) != 0)
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return -errno;
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#ifdef CLOCK_BOOTTIME
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if (clock_gettime(CLOCK_BOOTTIME, &hires_uptime) == 0) {
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TIMESPEC_TO_TIMEVAL(&lores_uptime, &hires_uptime);
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timersub(&now, &lores_uptime, boot_time);
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return 0;
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}
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#endif
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#ifdef HAVE_SYSINFO
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/* fallback */
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if (sysinfo(&info) != 0)
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return -errno;
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boot_time->tv_sec = now.tv_sec - info.uptime;
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boot_time->tv_usec = 0;
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return 0;
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#else
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return -ENOSYS;
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#endif
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}
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int gettime_monotonic(struct timeval *tv)
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{
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#ifdef CLOCK_MONOTONIC
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/* Can slew only by ntp and adjtime */
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int ret;
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struct timespec ts;
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# ifdef CLOCK_MONOTONIC_RAW
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/* Linux specific, can't slew */
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if (!(ret = clock_gettime(CLOCK_MONOTONIC_RAW, &ts))) {
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# else
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if (!(ret = clock_gettime(CLOCK_MONOTONIC, &ts))) {
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# endif
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tv->tv_sec = ts.tv_sec;
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tv->tv_usec = ts.tv_nsec / 1000;
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}
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return ret;
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#else
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return gettimeofday(tv, NULL);
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#endif
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}
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