Date: Wed, 29 May 2002 10:53:16 -0700 From: Peter Wemm <peter@wemm.org> To: Poul-Henning Kamp <phk@critter.freebsd.dk> Cc: John Baldwin <jhb@FreeBSD.ORG>, Julian Elischer <julian@elischer.org>, FreeBSD current users <current@FreeBSD.ORG> Subject: Re: Seeking OK to commit KSE MIII Message-ID: <20020529175316.1BC1438CC@overcee.wemm.org> In-Reply-To: <430.1022694008@critter.freebsd.dk>
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Poul-Henning Kamp wrote: > In message <XFMail.20020529124710.jhb@FreeBSD.org>, John Baldwin writes: > > >+ frame = td->td_frame; > >+ frame->tf_eax = retval; /* Child returns zero */ > >+ frame->tf_edx = aux; /* I dunno */ > > > >You could always ask about that instead of having a I dunno comment. :) > >I think that we no longer use 2 return values from syscalls for FreeBSD > >syscalls (I know we did for fork1() at one point, possibly still do > >so that 4.x libc works ok on 5.x kernel). Linux does depend on edx being > >preserved across a syscall though IIRC. > > We do for 64bit returns like lseek(2) And also pipe(2) has a dual return from the syscall itself. libc massages this into something that C programs like. Cheers, -Peter -- Peter Wemm - peter@wemm.org; peter@FreeBSD.org; peter@yahoo-inc.com "All of this is for nothing if we don't go to the stars" - JMS/B5 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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