Re: FD_SETSIZE > 1024 and select() break on intel ?
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 09:06:56 -0800
On Thu, Feb 12, 2009 at 9:02 AM, Shawn Erickson <email@hidden> wrote:
> 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.
Sorry clicked send instead of save...
I meant to point out that this came about as a result of getting Mac
OS X UNIX certified. Review the following to understand what changed
and how to restore "legacy" (aka non-conforming) behavior if you
really need it...
http://developer.apple.com/ReleaseNotes/Darwin/SymbolVariantsRelNotes/index.html
-Shawn
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