[Lksctp-developers] Re: connect() for socket API(lksctp)

[Sridhar S. <sr...@us...>]

On Fri, 7 Nov 2003, Hanping Long wrote:

> Hi,
> 
> I have one question regarding the connect() call. 
> For the nonblocking socket in LKSCTP, will connect() block as TCP does?  
> If yes, how long will it block(I mean how many RTT)?  
> Will it the same as graceful shutdown close() call?

It is not true that TCP blocks even when a TCP socket is set nonblocking. It
returns immediately with EINPROGRESS error.
The same is true with SCTP socket set to nonblocking.

In case of a blocking socket(which is the default), connect() blocks until
the association is established(4-way handshake is completed) or the connection 
is refused.

close() by default doesn't block for the graceful shutdown completion. It
simply starts the shutdown process by sending a SHUTDOWN and returns. But it 
can be made to block using SO_LINGER socket option where you can specify the 
max. duration for which to block using linger time.

Thanks
Sridhar