Error paa non-blocking socket

Er folgende fejl er ok:

"Resource temporarily unavailable"

Er det den fejl de i man siderne omtaler som EAGAIN?

Fra man:

If no messages are available at the socket, the receive calls wait  for
a message to arrive, unless the socket is nonblocking (see fcntl(2)) in
which case the value -1 is returned and the external variable errno set
to EAGAIN. 

Vi har nemlig en non-blocking socket.