--On Thursday, July 24, 2003 17:21:17 +0200 Peter Eisentraut
<peter_e@gmx.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/** Copyright (c) 2002 Caldera International, Inc. All Rights Reserved.** THIS IS UNPUBLISHED PROPRIETARY SOURCE
CODEOF* 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@lerctr.org
US Mail: 1905 Steamboat Springs Drive, Garland, TX 75044-6749
