hi Martin,
Thanks for the insight ,
I also came across this in opt.h
/**
* The maximum allowed backlog for TCP listen netconns.
* This backlog is used unless another is explicitly specified.
* 0xff is the maximum (u8_t).
*/
#ifndef TCP_DEFAULT_LISTEN_BACKLOG
#define TCP_DEFAULT_LISTEN_BACKLOG 0xff //default=0xff
#endif
and
/**
* MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP connections.
* (requires the LWIP_TCP option)
*/
#ifndef MEMP_NUM_TCP_PCB_LISTEN
#define MEMP_NUM_TCP_PCB_LISTEN 8 //default=8
#endif
in the case of 0 is a invalid value then the lwip should default to
TCP_DEFAULT_LISTEN_BACKLOG but not 1
also i thinlk 0 is a valid value ,I have used it before in some previous
projects under linux bsd and wince.
I will check again MIN and MAX values of backlog ,
somebody let me know will this it affect anything if I remove ths check.
from BSD manual
----------
If the *back_log* parameter specifies a value greater than the maximum
{SOMAXCONN} allowed, the specified value will be ignored and SOMAXCONN will
be used. If the *back_log* parameter specifies a negative value, the
specified value will be ignored and zero will be used.
----------
Regards,
Mrutyunjay B Patel
On Tue, Feb 22, 2011 at 6:29 PM, Mrutyunjay <[email protected]> wrote:
> hi ,
> from comment in lwipopt.h is only a flag to enable backloging option to
> tcp listening ports ,
> not the count of listning as you are saying,
>
> The count of listning queue should be controlled by the second parameter in
> the listen socket API,
>
> /* Listen on Socket
> * Keep Server on listening mode
> */
> if (listen(server_socket, MAXCLIENT) == -1)
>
> /**
> * TCP_LISTEN_BACKLOG: Enable the backlog option for tcp listen pcb.
> */
> #define TCP_LISTEN_BACKLOG 0 //Default = 0 == off
>
> also the call flow follows to following net conn api
> the comment says
> /**
> * Set a TCP netconn into listen mode
> *
> * @param conn the tcp netconn to set to listen mode
> * @param backlog the listen backlog, only used if TCP_LISTEN_BACKLOG==1
> * @return ERR_OK if the netconn was set to listen (UDP and RAW netconns
> * don't return any error (yet?))
> */
> err_t
> netconn_listen_with_backlog(struct netconn *conn, u8_t backlog)
>
>
> Regards,
> Mrutyunjay B Patel
>
>
>
> On Tue, Feb 22, 2011 at 5:51 PM, Simon Goldschmidt <[email protected]>wrote:
>
>>
>> Mrutyunjay <[email protected]> wrote:
>> > if i set TCP_LISTEN_BACKLOG 0 , I can see 1 active connection and 8 in
>> > queue , 9th connection is rejected.
>>
>> Setting TCP_LISTEN_BACKLOG==0 means "disabled". In this case, backlog is
>> limited by the number of PCBs.
>>
>> > if i set TCP_LISTEN_BACKLOG 1 , I can see 1 active connection and 1 in
>> > queue.
>>
>> In lwIP, the listen backlog is the number of incoming connections queued
>> for accept(), meaning once you accepted one connection, another one is free
>> to be queued for the next accept call. Open client connections previously
>> accepted do not count in here.
>>
>> SWimon
>> --
>> GMX DSL Doppel-Flat ab 19,99 Euro/mtl.! Jetzt mit
>> gratis Handy-Flat! http://portal.gmx.net/de/go/dsl
>>
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>
>
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