Date: Sat, 22 May 2010 11:48:09 -0400
From: Christopher Faylor <cgf-use-the-mailinglist-please AT cygwin DOT com>
To: 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)
Message-ID: <20100522154808.GA14004@ednor.casa.cgf.cx>
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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>
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On Sat, May 22, 2010 at 05:01:11AM -0700, mki-cygwin AT mozone DOT net wrote:
>On Tue, May 18, 2010 at 02:13:56PM -0700, you wrote:
>> > 15-Feb-2010 16:33:36.437 socket: file descriptor exceeds limit (128/64)
>> 
>> Not sure why this is happening other than the default limits not being 
>> honored and/or get botched by setrlimit() in there somewhere...
>
>So the issue with named not being able to bind to the ports is related
>to the default FD_SETSIZE limit of 64.  When accept returns an fd, it
>seems to be some value above 128.  Since FD_SETSIZE is 64, the fd_set
>structures all get created with that size and trying to call select
>with maxfds set to something greater than 64 results in select
>indefinetly spewing -1 with EBADF as errno.
>
>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.

cgf

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