AppLaunchTime.c

#include <sys/sysctl.h>

struct timeval AppLaunchTimeRelativeTo1970(void) {
  id_t pid = getpid();
  int mib[] = { CTL_KERN, KERN_PROC, KERN_PROC_PID, (int)pid };
  const size_t mibSize = sizeof(mib) / sizeof(mib[0]);
  size_t infoSize = 0;

  // Get initial size of KERN_PROC data structure.
  if (sysctl(mib, mibSize, NULL, &infoSize, NULL, 0) != 0) {
    NSCAssert(errno == 0, @"sysctl error - %d", errno);
    struct timeval invalid = { 0, 0 };
    return invalid;
  }
  struct kinfo_proc info;
  if (sysctl(mib, mibSize, &info, &infoSize, NULL, 0) != 0) {
    NSCAssert(errno == 0, @"sysctl error - %d", errno);
    struct timeval invalid = { 0, 0 };
    return invalid;
  }
  return info.kp_proc.p_starttime;
}