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Re: [lwip-users] lwip_accept() blocks for non-blocking sockets ?


From: Jonathan Larmour
Subject: Re: [lwip-users] lwip_accept() blocks for non-blocking sockets ?
Date: Tue, 30 Sep 2008 17:52:30 +0100
User-agent: Thunderbird 1.5.0.12 (X11/20070530)

Tamas Somogyi wrote:
> Hi,
> 
> It seems that lwip_accept() blocks the calling thread even if the
> listening socket is set to non-blocking mode - see sample code below.
> Is it the normal behaviour or a bug?

Normal behaviour. Only non-blocking reads are implemented in lwip.

However lwIP does have receive timeouts, which also affect accepts. Perhaps
that might be useful. Enable LWIP_SO_RCVTIMEO in lwipopts.h, and do a call
to lwip_setsockopt, e.g.:

int timeout = 1000; /* 1000 msecs */
err = lwip_setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout));

Jifl
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