Re: [lwip-users] Nonblocking sockets problem

[Simon Goldschmidt]

"Åke Forslund" <address@hidden> wrote:
> Hi again, this is not the original code but a implementation of the
> problem in our simple telnet-server for debug. Code below. In our original 
> code
> we use ioctlsocket() to set non-blocking but using lwip_ fcntl() makes no
> difference.

The code you sent works for me with one slight modification: you have to check 
the return value of lwip_accept() to be >= 0 to enter the first while(1) loop. 
Better yet, use select to see if accept will succeed (put lSocketRecv on the 
readset).

You don't check the return value of lwip_accept() although calling it on a 
nonblocking socket: unless there's actually a new connection pending -1 will be 
returned. Then of course, the inner while(1) loop is never exited because you 
will never receive 'q' without a client (lwip_read() always returns -1 as 
new_fd is -1).

Simon
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