How big is socket receive buffer, and how to control it?

If I use send() on one Linux box to send data to a socket on another
Linux box and use recv() to read the data, how large is the buffer on
the destination box, i.e. how much stuff can I send it before it
overflows or blocks and refuses to take any more?

There is a situation where the receiving host may not get around to
reading the data with recv() for a while.

Is there a way to control the size of the receive buffer, perhaps a
configuration parameter or even a change to a header file and a
recompile of the kernel?

Both hosts in this situation are Pentium 4 running Fedora Core 3 with
512 MB RAM.

Thanks...

C. J. Clegg wrote:
> If I use send() on one Linux box to send data to a socket on another
> Linux box and use recv() to read the data, how large is the buffer on
> the destination box, i.e. how much stuff can I send it before it
> overflows or blocks and refuses to take any more?
>
> There is a situation where the receiving host may not get around to
> reading the data with recv() for a while.

Then there is nothing in the receive buffer.

> Is there a way to control the size of the receive buffer, perhaps a
> configuration parameter or even a change to a header file and a
> recompile of the kernel?

man 7 socket
search for SO_SNDBUF and SO_RCVBUF