svn commit: r304928 - in head/lib/libc: amd64/sys i386/sys sys

[Konstantin Belousov]

On Sun, Aug 28, 2016 at 03:38:10AM +0300, Andrey Chernov wrote:
> 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.
> 
ptrace(2) is not a standard function.
And, we cannot break ABI for the syscall.