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Subject: Re: svn commit: r304928 - in head/lib/libc: amd64/sys i386/sys sys
To: Konstantin Belousov <kib@FreeBSD.org>, src-committers@freebsd.org,
 svn-src-all@freebsd.org, svn-src-head@freebsd.org
References: <201608272303.u7RN3N0D078505@repo.freebsd.org>
From: Andrey Chernov <ache@freebsd.org>
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Date: Sun, 28 Aug 2016 03:38:10 +0300
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On 28.08.2016 2:03, Konstantin Belousov wrote:
>   Since ptrace(2) syscall can return -1 for non-error situations, libc
>   wrappers set errno to 0 before performing the syscall, as the service
>   to the caller.

Both C99 and POSIX directly prohibits any standard function to set errno
to 0. ptrace() should either choose other errno to indicate non-error
situation or change return -1 to something else.