perror() changes the orientation of stderr to byte-oriented mode if stderr is not oriented yet.

[Takashi Yano]

On Thu, 5 Jul 2018 14:49:00 +0200
Corinna Vinschen wrote:
> ...I noticed that FreeBSD handles psignal differently.  It writes the
> output immediately to STDERR_FILENO, rather than to stderr or
> fileno(stderr).  It does also not call fflush or reset the _SOFF flag.
...
> Thoughts?

Since _newlib_flockfile_start()/end() are defined in stdio/local.h, using
_newlib_flockfile_start()/end() from psignal.c is a bit painful. Moreover
there are several reports that they can not build newlib on bare metal.
Therefore, I imitated FreeBSD in a hurry just because it seems the easiest
way.

-- 
Takashi Yano <takashi.yano@nifty.ne.jp>
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