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Re: lib/41085: sigaction returns EINVAL instead of -1
The following reply was made to PR lib/41085; it has been noted by GNATS.
From: David Laight <david%l8s.co.uk@localhost>
Cc: lib-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost,
Subject: Re: lib/41085: sigaction returns EINVAL instead of -1
Date: Sat, 28 Mar 2009 12:24:58 +0000
On Sat, Mar 28, 2009 at 04:45:02AM +0000, David Holland wrote:
> I've looked over the kernel and libc code involved and I don't see any
> plausible way for it to mix the return value and error code, unless
> something Xen-specific is causing the carry flag (which distinguishes
> error returns from real return values) to get cleared in the low-level
> code on the way back from the system call.
Or somehow some Linux system call code is being used/assumed...
Where, instead of using the carry flag, small negative return values
are taken as errno values.
David Laight: david%l8s.co.uk@localhost
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