Date:	Sat, 02 Sep 2000 21:11:31 +0200
From:	"Eli Zaretskii" <eliz AT is DOT elta DOT co DOT il>
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To:	mail AT jgreen4 DOT fsnet DOT co DOT uk
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In-reply-to:	<jea2rsk8mdep7qs6d9n6po6d0bgntg1m7o@4ax.com> (message from Jason
	Green on Sat, 02 Sep 2000 18:24:23 +0100)
Subject:	Re: Symify fixes
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> From: Jason Green <mail AT jgreen4 DOT fsnet DOT co DOT uk>
> Date: Sat, 02 Sep 2000 18:24:23 +0100
> > > 
> > > Actually no, a system call can legally set errno even if no error
> > > occured.
> > 
> > I think ANSI specifically disallows this: if no error occured, errno
> > should be left alone.  
> 
> You could be right, it's just that this is contrary to what I have
> read elsewhere.

The ANSI standard says:

  The value of `errno' is zero at program startup, but is never set to
  zero by any library function.  The value of `errno' may be set to
  nonzero by a library function call whether or not there is an error,
  provided the use of `errno' is not documented in the description of
  the function in this International Standard.

So the value of `errno' is prohibited from being reset to zero.  The
standard indeed allows to set `errno' to a nonzero value when no
apparent error has happened (because some underlying system calls
could fail), but the DJGPP library generally tries very hard to avoid
that.

> The real point is whether to commit all or some of the patches to
> symify.  IMHO, modified bail() should be commited.

FWIW, I agree.

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