/** {@inheritDoc} */
@Override
public long getSystemUptime() {
IntByReference size = new IntByReference();
if (0 != SystemB.INSTANCE.sysctlbyname("kern.boottime", null, size, null, 0)) {
LOG.error("Failed to get Boot Time. Error code: " + Native.getLastError());
return 0L;
}
// This should point to a 16-byte structure. If not, this code is valid
if (size.getValue() != 16)
throw new UnsupportedOperationException("sysctl kern.boottime should be 16 bytes but isn't.");
Pointer p = new Memory(size.getValue() + 1);
if (0 != SystemB.INSTANCE.sysctlbyname("kern.boottime", p, size, null, 0)) {
LOG.error("Failed to get Boot Time. Error code: " + Native.getLastError());
return 0L;
}
// p now points to a 16-bit timeval structure for boot time.
// First 8 bytes are seconds, second 8 bytes are microseconds (ignore)
return System.currentTimeMillis() / 1000 - p.getLong(0);
}
public final long getLong(long offset) {
checkBounds(offset, 8);
return ptr.getLong(offset);
}