Re: libpq_r

--On Thursday, July 24, 2003 17:21:17 +0200 Peter Eisentraut
<peter_e(at)gmx(dot)net> wrote:

> Bruce Momjian writes:
>
>> Now I see what you are saying, that _REENTRANT just makes it reentrant,
>
> _REENTRANT only makes additional functions visible in the header files, it
> doesn't change any functions to behave differently. (This is not hard to
> imagine, because the lack of reentrancy of most functions lies in the
> public interface, and you can't change that transparently.)
>
I beg to differ. Explicitly, on UnixWare, the <errno.h> header, reproduced
below, under
fair use, show an EXPLICIT difference in what happens with _REENTRANT:
$ cat /usr/include/errno.h
/*
* Copyright (c) 2002 Caldera International, Inc. All Rights Reserved.
*
* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF
* Caldera International, Inc.
*
* The copyright notice above does not evidence any actual or intended
* publication of such source code.
*/

#ifndef _ERRNO_H
#define _ERRNO_H
#ident "@(#)unixsrc:usr/src/common/head/errno.h /main/uw7_nj/2"

#include <sys/errno.h>

#ifdef _REENTRANT

#ifdef __cplusplus
extern "C" {
#endif

extern int *__thr_errno(void);

#ifdef __cplusplus
}
#endif

#define errno (*__thr_errno())

#else /*!_REENTRANT*/

extern int errno;

#ifdef __cplusplus /* C++ requires that this be a macro! */
#define errno errno
#endif

#endif /*_REENTRANT*/

#endif /*_ERRNO_H*/
$

--
Larry Rosenman http://www.lerctr.org/~ler
Phone: +1 972-414-9812 E-Mail: ler(at)lerctr(dot)org
US Mail: 1905 Steamboat Springs Drive, Garland, TX 75044-6749