Errno: 11, Resource Temporarily Unavailable

Question

I am using c sockets to implement a reliable UDP protocol. I am using the following code to set a timeout on a socket in which I\'m waiting for an acknowledgement. I am not su

Answer 1

When calling recvfrom() on a blocking socket and a time out had been set using setsockopt() it is normal to get the error EAGAIN (11) in case the call to recvfrom() timed out (that is: no data was received in the time period specified as time out).

Verbatim from man recvfrom:

RETURN VALUE

...

ERRORS

... .

EAGAIN or EWOULDBLOCK The socket is marked non-blocking and the receive operation would block, or a receive timeout had been set and the timeout expired before data was received. ...

To get around this: Just call recvfrom () again ... ;-)