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Re: FD_SETSIZE > 1024 and select() break on intel ?
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Re: FD_SETSIZE > 1024 and select() break on intel ?


  • Subject: Re: FD_SETSIZE > 1024 and select() break on intel ?
  • From: Shawn Erickson <email@hidden>
  • Date: Thu, 12 Feb 2009 09:02:53 -0800

On Thu, Feb 12, 2009 at 7:08 AM, Nicolas Berloquin <email@hidden> wrote:
>> Sounds like you should read up on FD_SETSIZE in man select:
>>
>>> The behavior of these macros is undefined if a descriptor value is less
>>> than zero or greater than or equal to
>>> FD_SETSIZE
>
> yes, but it works/worked fine when compiled in PPC !!!

You may have found an edge case but it doesn't mean what you are doing
is expected to work.

> Actually some versions of select() are defined to accept values > FD_SETSIZE
> as long as you take
> care to allocate the memory yourself.
> and it's not specifically described in the universal app guide...

>From the man page (10.5 system)...

COMPATIBILITY
     select() now returns with errno set to EINVAL when nfds is
greater than FD_SETSIZE.  Use a smaller
     value for nfds or compile with -D_DARWIN_UNLIMITED_SELECT.

-Shawn
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  • Follow-Ups:
    • Re: FD_SETSIZE > 1024 and select() break on intel ?
      • From: Shawn Erickson <email@hidden>
References: 
 >FD_SETSIZE > 1024 and select() break on intel ? (From: Nicolas Berloquin <email@hidden>)
 >Re: FD_SETSIZE > 1024 and select() break on intel ? (From: Frederick Cheung <email@hidden>)
 >Re: FD_SETSIZE > 1024 and select() break on intel ? (From: Nicolas Berloquin <email@hidden>)

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