[lwip-devel] [bug #28968] some request & DNS bug

[David Empson]

Follow-up Comment #4, bug #28968 (project lwip):

Mac OS X (derived from BSD Unix, and certified as standard Unix) appears to
be the same as Linux.

If you use setsockopt() to enable SO_RCVTIMEO, and insufficient data is
received, then recv() will return after the timeout period. If no data was
received, recv() returns -1 and errno is set to EAGAIN (EWOULDBLOCK is
#defined as EAGAIN). If some data was received (but not enough to satisfy the
length parameter) then a reduced count is returned but no error is reported.

The ETIMEDOUT error means that the connection has timed out (hence is
unusable), so it is a fatal error.

Regarding the Windows API: in a somewhat old copy of MSDN, I can't see
mention of any mechanism for a timeout on recv(), and there is no SO_RCVTIMEO,
so Windows doesn't have a defined error code for that situation (unless one
has been added since 2001).

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