From owner-freebsd-current  Sun Feb 10 16:10:54 2002
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Date: Sun, 10 Feb 2002 19:10:36 -0500 (EST)
From: Daniel Eischen <eischen@pcnet1.pcnet.com>
To: Bruce Evans <bde@zeta.org.au>
Cc: Kevin Day <toasty@shell.dragondata.com>, current@FreeBSD.ORG,
	bde@FreeBSD.ORG
Subject: Re: function name collision on "getcontext" with ports/editors/joe
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On Mon, 11 Feb 2002, Bruce Evans wrote:
> On Sun, 10 Feb 2002, Daniel Eischen wrote:
> 
> > Hmm, <sys/signal.h> includes <sys/ucontext.h>.  I'm not sure why though.
> > bde might know.
> 
> <sys/signal.h> includes <machine/signal.h> for the normal namespace
> pollution that was needed to use sigreturn(2) (except sigreturn(2)
> itself isn't actually declared anywhere).  Including <sys/ucontext.h>
> gives the corresponding namespace pollution for using the current
> sigreturn(2).  This is probably a mistake.  (Don't believe the
> sigreturn man page; it documents osigreturn(2) for the i386 only.)
> Programs shouldn't have any problems with this, since they should
> define _POSIX_SOURCE if they only want the POSIX namespace ;-).

Poking about on a Solaris 8 system shows that they have a
<ucontext.h> that defines the {get,set,make,swap}context
prototypes.  <ucontext.h> also includes <sys/ucontext.h>
to get the definitions for ucontext_t.

Under FreeBSD, <ucontext.h> is a link to <sys/ucontext.h>,
which both declare ucontext_t and {get,set,make,swap}context.

What do you recommend we do?  Should we not include <sys/ucontext.h>
from <sys/signal.h>, or do what Solaris does, or just leave
everything as is?

-- 
Dan Eischen



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