Function GetBootTime

util/datetime/uptime.cpp:14–22

#if defined(_darwin_) || defined(_freebsd_)
namespace {
    TInstant GetBootTime() {
        struct timeval timeSinceBoot;
        size_t len = sizeof(timeSinceBoot);
        int request[2] = {CTL_KERN, KERN_BOOTTIME};
        if (sysctl(request, 2, &timeSinceBoot, &len, nullptr, 0) < 0) {
            ythrow yexception() << "cannot get kern.boottime from sysctl";
        }
        return TInstant::MicroSeconds(timeSinceBoot.tv_sec * 1'000'000 + timeSinceBoot.tv_usec);
    }

    TDuration GetBSDUptime() {
        TInstant beforeNow;