linux-kernel - Re: [PATCH 21/21] posix_types: Remove fd

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Date:	Wed, 08 Feb 2012 13:30:55 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	David Howells <dhowells@...hat.com>
CC:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH 21/21] posix_types: Remove fd_set macros

On 02/08/2012 01:24 PM, David Howells wrote:
> H. Peter Anvin<hpa@...or.com>  wrote:
>
>> Anyway, select() paraphernalia goes in<sys/time.h>  (as opposed to
>> <time.h>), poll() paraphernalia goes in<sys/poll.h>, and the linux/*
>> files mimics that.
>
> That doesn't seem to be so - at least not for my copy of glibc:
>
> /usr/include/sys/select.h:/* fd_set for select and pselect.  */
> /usr/include/sys/select.h:  } fd_set;
> /usr/include/sys/select.h:#define       FD_ISSET(fd, fdsetp)    __FD_ISSET (fd, fdsetp)
>
> Besides, this is inside the kernel.  The I/O polling architecture definitions
> (which includes select) ought to be in one place there, not spread out all
> over the place.
>

I think <sys/select.h> is more recent, but anyway, look at the existing 
<linux/time.h> and you see why it's there.

It's fine to say it shouldn't be, but then ALL the definitions should 
move (and that should be a separate change from this patchset)... but do 
note that some of those macro definitions (which I did NOT change) are 
exported to user space so make those changes with care.

	-hpa


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