From: jjf AT bcs DOT org DOT uk (J. J. Farrell)
Subject: Re: setting errno
20 Jan 1999 08:24:17 -0800
Message-ID: <199901200233.SAA26740.cygnus.gnu-win32@aleph.ssd.hal.com>
References: <3 DOT 0 DOT 5 DOT 32 DOT 19990119122347 DOT 0a413ec0 AT linus DOT mitre DOT org>
Content-Type: text
To: ttaylor AT mitre DOT org (Tim Taylor)
Cc: gnu-win32 AT cygnus DOT com

> From: Tim Taylor <ttaylor AT mitre DOT org>
> 
> I'm porting a program that sets errno if an operation fails.  However, in
> the B20.1 errno is a macro that dereferences the pointer returned by a
> function #define errno (*__errno())
> 
> What is the proper way to set errno in cygwin?

The same as with any other Standard C conformant definition of errno -
something like
                   errno = whatever;

> Based on comments I've read in the headers, it appears that the following
> will work:
> 
> _REENT->_errno = xxx
> 
> Is this correct, or is there a more compatible or preferred way of doing this?

Is there some problem with doing it the normal way?

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