linux-kernel - RE: X86 fpu registers in a signal handler's ucontext

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Message-ID: <20866.18969.21166.669069@pilspetsen.it.uu.se>
Date:	Thu, 2 May 2013 13:12:25 +0200
From:	Mikael Pettersson <mikpe@...uu.se>
To:	"Warlich, Christof" <christof.warlich@...mens.com>
Cc:	richard -rw- weinberger <richard.weinberger@...il.com>,
	Mikael Pettersson <mikpe@...uu.se>,
	Andi Kleen <andi@...stfloor.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: X86 fpu registers in a signal handler's ucontext

Warlich, Christof writes:
 > richard -rw- weinberger <richard.weinberger@...il.com> writes:
 > > Are you telling us that Ubuntu shipped the wrong header file?
 > 
 > Hmm - at least I still don't know how to get the right definition
 > of uc_mcontext (with eglibc-2.13 on Ubuntu 11.10) ...
 > 
 > If I include both signal.h and asm-generic/ucontext.h, gcc reports
 > this error:
 > 
 > /usr/include/asm-generic/ucontext.h:4:8: error: redefinition of 'struct ucontext'
 > /usr/include/i386-linux-gnu/sys/ucontext.h:119:16: error: previous definition of 'struct ucontext'
 > 
 > Thus, signal.h obviously includes the wrong i386-linux-gnu/sys/ucontext.h
 > defining uc_mcontext to be of type mcontext_t.
 > 
 > So is it still me doing something wrong or or _did_ Ubuntu ship
 > the wrong header files?

#include <signal.h>
#include <ucontext.h>

has worked for my SIGFPE handlers on Linux for the last 10+ years on various distros
and target architectures.

Can we stop this thread now?  There is no _kernel_ issue here.
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