#include <sys/param.h>
#include <sys/sysctl.h>
#if defined(__DragonFly__) || defined(__FreeBSD__)
#include <sys/user.h>
#endif

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int main(int argc, char *argv[])
{
#if defined(__NetBSD__)
  int mib[6] = { CTL_KERN, KERN_PROC2, KERN_PROC_PID, getpid(), sizeof(struct kinfo_proc2), 1 };
#elif defined(__OpenBSD__)
  int mib[6] = { CTL_KERN, KERN_PROC, KERN_PROC_PID, getpid(), sizeof(struct kinfo_proc), 1 };
#else
  int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PID, getpid() };
#endif
  size_t buffer_size;

#if defined(__NetBSD__) || defined(__OpenBSD__)
  if (sysctl(mib, 6, NULL, &buffer_size, NULL, 0))
#else
  if (sysctl(mib, 4, NULL, &buffer_size, NULL, 0))
#endif
    return 0;

#if defined(__NetBSD__)
  struct kinfo_proc2 *proc = (struct kinfo_proc2 *) malloc(buffer_size);
#else
  struct kinfo_proc *proc = (struct kinfo_proc *) malloc(buffer_size);
#endif

  if (sysctl(mib, 4, proc, &buffer_size, NULL, 0)) {
    free(proc);
    return 0;
  }

#if defined(__APPLE__)
  printf("%lds %ldus\n", proc->kp_proc.p_un.__p_starttime.tv_sec, proc->kp_proc.p_un.__p_starttime.tv_usec);
#elif defined(__DragonFly__)
  printf("%lds %ldus\n", proc->kp_start.tv_sec, proc->kp_start.tv_usec);
#elif defined(__FreeBSD__)
  printf("%lds %ldus\n", proc->ki_start.tv_sec, proc->ki_start.tv_usec);
#else
  printf("%lds %ldus\n", proc->p_ustart_sec, proc->p_ustart_usec);
#endif

  return 0;
}