Re: [lwip-users] opening multiple sockets fails

[Dennis Borgmann]

Hi Simon,

thank you for your help on this. I check the errno when socket returns. 
The returnvalue of socket is "-1" and errno is not altered at all. If I 
set it to "1" prior to this command, it stays being "1" and if I don't 
initialize errno at all, it has the value "0". So, this can't be the 
correct errno of the socket call.

I will try to enhance memory later, but still, this does not seem to 
work the way it should.

Best regards,
Dennis


Am 19.10.2011 10:56, schrieb Simon Goldschmidt:
> Dennis Borgmann<address@hidden>  wrote:
> > It seems like lwIP does not like this. As soon as I open more than one
> > socket, the return value of socket is negative.
> a) A more detailed error number is saved in 'errno'. You should try to get that 
> value somehow to see what's wrong (error numbers are defined in arch.h).
> b) It could be that you just have configured available memory too low. In that case, 
> available resources wouldn't allow you to create a 2nd socket. In that case, you should 
> go through lwipopts.h and increase the some configuration options (see comments in opt.h 
> and the lwip wiki - "http://lwip.wikia.com/wiki/Lwipopts.h"; - for an 
> explanation).
>
> Simon