Re: [lwip-users] lwip_select never returns value > 0

[pekez]

So far I have used SO_RCVTIMEO socket functionality for timeout, and I have always received data. Never had problems with it. However, I would like to switch to select() for timeouts, because of some various reasons.

On 14.3.2017 13:50, address@hidden wrote:

If you do not use select call, Are you able to receive anything? It may be possible that since there is no data available select will eventually timeout.

 

Regards,

Ajay bhargav

 

 

From: pekez
Sent: Tuesday, March 14, 2017 6:17 PM
To: Mailing list for lwIP users
Subject: Re: [lwip-users] lwip_select never returns value > 0

 

Hi Ajay,

I have just checked it. Since timeout always expires, return value of lwip_select() is always 0. Therefore no errno is set.

On 14.3.2017 13:40, address@hidden wrote:

Hi Nenad,

 

Did you check errno?

 

Regards,

Ajay Bhargav

 

 

From: pekez
Sent: Tuesday, March 14, 2017 5:51 PM
To: Mailing list for lwIP users
Subject: [lwip-users] lwip_select never returns value > 0

 

Hi people,

 

I am trying to use lwip_select in combination with lwip_recv. I have

done it like this so far:

 

FD_ZERO(&rfds);

FD_SET(new_sd, &rfds);

tv.tv_sec = 0;

tv.tv_usec = 200000;

 

if (lwip_select(new_sd + 1, &rfds, NULL, NULL, &tv) > 0)

{

     lwip_recv()

 

}

 

No matter what, timeout always exceeds. Am I doing anything wrong?

Should I include some lwip option in order to use lwip_select()?

I am using lwip v1.4.1.

 

Regards,

Nenad

 

 

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