MACHgettime.c

/*
Fix for missing realtime clock in OS X
======================================
author: jbenet
os x, compile with: gcc -o testo test.c 
linux, compile with: gcc -o testo test.c -lrt
*/

#include <time.h>
#include <sys/time.h>
#include <stdio.h>

#ifdef __MACH__
  #include <mach/clock.h>
  #include <mach/mach.h>
#endif

void current_utc_time(struct timespec *ts) {
  #ifdef __MACH__ // OS X does not have clock_gettime, use clock_get_time
    clock_serv_t cclock;
    mach_timespec_t mts;
    host_get_clock_service(mach_host_self(), CALENDAR_CLOCK, &cclock);
    clock_get_time(cclock, &mts);
    mach_port_deallocate(mach_task_self(), cclock);
    ts->tv_sec = mts.tv_sec;
    ts->tv_nsec = mts.tv_nsec;
  #else
    clock_gettime(CLOCK_REALTIME, ts);
  #endif
}

int main(int argc, char **argv) {
  struct timespec ts;
  current_utc_time(&ts);
  printf("s:  %lu\n", ts.tv_sec);
  printf("ns: %lu\n", ts.tv_nsec);
  return 0;
}

/*
Endfix
*/