Re: [PATCH] Make EWOULDBLOCK be equal to EAGAIN on parisc.

[Mike Frysinger <vapier@gentoo.org>]

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On Thursday 16 January 2014 16:15:33 Helge Deller wrote:
> On 01/16/2014 10:05 PM, Carlos O'Donell wrote:
> > On Thu, Jan 16, 2014 at 3:49 PM, John David Anglin wrote:
> >>> This is an ABI break.
> >>> 
> >>> You can't do this without rebuilding userspace.
> >>> 
> >>> You need debian an gentoo onboard to do this ABI break.
> >> 
> >> This would take about a month on Debian, so I'm against.  Various bits
> >> of kernel code traditionally return EWOULDBLOCK, so any application
> >> code that just checks EWOULDBLOCK would fail.
> > 
> > That's not true if, like all other targets, EWOULDBLOCK == AGAIN. It's
> > only true on hppa, and that's the problem.
> > 
> > The kernel is completely inconsistent about returning EWOULDBLOCK or
> > EAGAIN, and the standards do dictate one or the other so the kernel
> > and glibc are correct to use one or the other to match the standard.
> > 
> > However, user applications are equally sloppy about checking the right
> > value.
> 
> Guy, do you have actual programs which are currently broken and which don't
> check for both? My feeling is, that most programs were fixed, but I might
> be wrong...

my guess is memcached:
https://bugs.gentoo.org/show_bug.cgi?id=498262
-mike

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