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Message-ID: <ea3de3f0-ed55-bfcf-f543-a95e38b98599@dronecode.org.uk>
Date: Wed, 6 Jul 2022 15:01:23 +0100
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Subject: Re: Typo in <sys/select.h>?
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To: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>,
        The Cygwin Mailing List <cygwin AT cygwin DOT com>
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On 06/07/2022 08:42, Corinna Vinschen wrote:
> On Jul  5 17:51, Ken Brown wrote:
>> On 7/5/2022 10:13 AM, Lavrentiev, Anton (NIH/NLM/NCBI) [C] via Cygwin wrote:
> 
> I guess we can change FD_SETSIZE to 1024 as on Linux, albeit this has no
> real meaning on Cygwin.  On Linux, select(2) is really only capable to
> handle file descriptors numbers up to descriptor number 1023, but Cygwin
> doesn't have this problem.  FD_SETSIZE == 64 was only something to save
> space.  The bigger FD_SETSIZE, the bigger are the default fd_sets,
> something you don't want on small targets.
> 
> So, yeah, something like
> 
>    #ifndef FD_SETSIZE
>    # ifdef __CYGWIN__
>    #  define FD_SETSIZE      1024
>    # else
>    #  define FD_SETSIZE      64
>    # endif
>    #endif

Remember that 64 is MAXIMUM_WAIT_OBJECTS for WaitForMultipleObjects(), 
the underlying Win32 API used to implement select(), so using more than 
64 hits some complex code to work around that...

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