Date: Thu, 11 Mar 2010 18:15:07 -0500 From: Jung-uk Kim <jkim@FreeBSD.org> To: freebsd-hackers@freebsd.org Cc: Marcel Moolenaar <xcllnt@mac.com> Subject: Re: [RFC] Saving the latest errno from syscalls. Message-ID: <201003111815.10186.jkim@FreeBSD.org> In-Reply-To: <8EE3605E-6E39-44A1-9E3A-5A37E1921D27@mac.com> References: <201003111624.51018.jkim@FreeBSD.org> <8EE3605E-6E39-44A1-9E3A-5A37E1921D27@mac.com>
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On Thursday 11 March 2010 04:55 pm, Marcel Moolenaar wrote: > On Mar 11, 2010, at 1:24 PM, Jung-uk Kim wrote: > > While I was debugging syscalls, I found a very useful field in > > struct thread, td_errno. It seems it was added for dtrace but it > > is only populated on amd64 and i386. Is the attached patch > > acceptable for maintainers of other platforms? > > Isn't it better to do it in cpu_set_syscall_retval()? > That way you catch all cases, plus you can save the > translated error as well... I just took amd64/i386 as an example and I was not sure whether it was meant to store translated error or not. Does anyone with DTrace internal knowledge answer the question? Jung-uk Kim
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