[lwip-devel] [patch #6861] Support for proper system termination in lwIP

[Iordan Neshev]

Follow-up Comment #3, patch #6861 (project lwip):

>In the past, there have been multiple requests for 'graceful >shutdown' of
the stack and every time, we decided to not >implement it because it's not
used on most platforms (embedded >systems just power off) 
There are exceptions. We have a battery powered GPRS terminal which acquires
information and goes online only for a minute or two every day in order to
send it. I bet there are much users that have similar needs.

We solved the problem by creating and assigning separate .text, .data and
.bss sections only for lwip+netif+ping/.... Then I wrote lwip_reinit() which
does exactly what the startup code in crt0.s does (note: we had to add the
-fno-common compiler option in order to place all lwip's variables in the
dedicated section). We don't need lwip_shutdown() function, we just stop
calling the tcp_tmr(). We don't use an OS if it matters.

> and it requires much code most people will never use
It can be surrounded by something like #if LWIP_SHUTDOWN_SUPPORT

>So, any reason to leave this open?
How about schedule it for 1.4? 

Regards,
Iordan

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