Re: As long as we are talking about sockets

[Scott Klement <klemscot@xxxxxxxxxxxx>]

With non-blocking sockets, it's possible (even likely) that you'll do
a recv() and get back zero bytes.  With blocking sockets, however, the
system will not return from the call to recv until there  is actually data
to read.

In fact, that's the difference between blocking & non-blocking.
non-blocking always returns immediately, it never waits for data.   so if
there's currently data in the receive buffer, it'll return it, otherwise
it returns nothing.    Blocking, on the other hand, will "block" (wait) on
the recv() call until data appears.

Oh, and any time I mention "recv()" the same is also true for "read()".
Just in case that comes up again today :)


On Mon, 22 Apr 2002, Bartell, Aaron L. (TC) wrote:
>
> If I connect to the IBM HTTP server (Original) via a socket program is it
> possible for it to pass back to me zero (0) bytes on the first read if the
> network traffic is too high and then above zero values for consecutive
> reads?
>