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Date: Fri, 29 Nov 2019 17:09:37 +0300
From: Andrey Repin <anrdaemon AT yandex DOT ru>
Reply-To: cygwin AT cygwin DOT com
Message-ID: <126481108.20191129170937@yandex.ru>
To: All <cygwin AT cygwin DOT com>, cygwin AT cygwin DOT com
Subject: Re: 1.7.1: Bind 9.6.0-P1 on Vista: could not listen on UDP socket: not enough   free resources (patch attached)
In-Reply-To: <20100522204508.GB21401@cyclonus.mozone.net>
References: <4B796E07 DOT 6080203 AT hp DOT com> <20100518211356 DOT GA18141 AT cyclonus DOT mozone DOT net>   <20100522120111 DOT GA21401 AT cyclonus DOT mozone DOT net>  <20100522154808 DOT GA14004 AT ednor DOT casa DOT cgf DOT cx>  <20100522204508 DOT GB21401 AT cyclonus DOT mozone DOT net>
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Greetings, All!

>> >The workaround I found was to recompile the sources, but making sure
>> >that -DFD_SETSIZE=16384 is defined during the configure stage.  Patch
>> >attached below.
>> >
>> >Can someone please update the port with this bumped up FD_SETSIZE patch?
>> 
>> If FD_SETSIZE is used to control what goes into one of the fd_set arguments
>> to select() this won't work too well.
>> 
>> fd's are allocated monotonically starting with 0 so if accept() is really 
>> returning something greater than 63 someone should figure out why.

> Actually digging into it, named requires at least a minimum of 128.  It 
> then, as a result, issues fcntl(fd, FD_DUPFD, reserved), where reserved is
> the minimum value of 128 if the socket is determined to be a udp one.
> If fd's greater than 64 were truely invalid then duping the fd with the
> reserved range greater than 64 should have resulted in -1 with errno of 
> EBADF just like select did.

> Besides, I believe the only deficiency here is that bind's configure
> isn't smart enough to auto correct the FD_SETSIZE when it detects it's
> under cygwin.  Other utilities more than likely already do this part 
> automatically for you during the configure stage...

> Anyhow, I did a private build using cygport and the patch attached in my
> previous response, and the resulting named (and utilities/libraries) are
> working quite well.

This is still a problem, just hit it today. :(

Setting sockets to any number above 128 crashes named.exe.


-- 
With best regards,
Andrey Repin
Friday, November 29, 2019 17:08:06

Sorry for my terrible english...


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