os:: unix:: io:: AsRawFd
A trait to extract the raw unix file descriptor from an underlying object.
This is only available on unix platforms and must be imported in order
to call the method. Windows platforms have a corresponding
AsRawSocket set of traits.
Extracts the raw file descriptor.
This method does not pass ownership of the raw file descriptor to the caller. The descriptor is only guaranteed to be valid while the original object has not yet been destroyed.