/*
 * @OSF_COPYRIGHT@
 * COPYRIGHT NOTICE
 * Copyright (c) 1990, 1991, 1992, 1993 Open Software Foundation, Inc.
 * ALL RIGHTS RESERVED (DCE).  See the file named COPYRIGHT.DCE in the
 * src directory for the full copyright text.
 * (c) Copyright 1991, 1992 Siemens-Nixdorf Information Systems
 * Burlington, MA, USA
 * All Rights Reserved
 */
/*
 * HISTORY
 * $Log: cma_int_errno.h,v $
 * Revision 1.1.2.4  1992/12/15  22:28:33  alan
 * 	Insert copyright notices
 * 	[1992/12/07  19:39:12  alan]
 *
 * Revision 1.1.2.3  1992/09/29  20:15:04  devsrc
 * 	[OT 5373]    SNI/SVR4 merge.
 * 	[1992/09/17  20:49:14  sekhar]
 * 
 * Revision 1.1.2.2  1992/09/03  14:38:05  bolinger
 * 	Replace current source file with equivalent from DEC BL10+
 * 	source base, as originally integrated in the
 * 	nosupport/threads_bl10 tree.  (See OT defect 5300.)
 * 	[1992/09/02  14:04:29  bolinger]
 * 
 * Revision 1.1.2.2  1992/05/08  23:29:25  bolinger
 * 	BL10 CMA sources from DEC.
 * 	[1992/05/08  23:29:07  bolinger]
 * 
 * Revision 1.1  1992/01/19  14:40:41  devrcs
 * 	Initial revision
 * 
 * $EndLog$
 */
/*
 *	%W%	(DEC OSF/1)	%G%
 */
/*
 *  Copyright (c) 1990, 1991 by
 *  Digital Equipment Corporation, Maynard Massachusetts.
 *  All rights reserved.
 *
 *  This software is furnished under a license and may be used and  copied
 *  only  in  accordance  with  the  terms  of  such  license and with the
 *  inclusion of the above copyright notice.  This software or  any  other
 *  copies  thereof may not be provided or otherwise made available to any
 *  other person.  No title to and ownership of  the  software  is  hereby
 *  transferred.
 *
 *  The information in this software is subject to change  without  notice
 *  and  should  not  be  construed  as  a commitment by DIGITAL Equipment
 *  Corporation.
 *
 *  DIGITAL assumes no responsibility for the use or  reliability  of  its
 *  software on equipment which is not supplied by DIGITAL.
 */

/*
 *  FACILITY:
 *
 *	DECthreads services
 *
 *  ABSTRACT:
 *
 *	Header file for internal DECthreads errno functions
 *
 *  AUTHORS:
 *
 *	Dave Butenhof
 *
 *  CREATION DATE:
 *
 *	12 April 1991
 *
 *  MODIFICATION HISTORY:
 *
 *	001	Dave Butenhof	30 October 1991
 *		OSF DCE wants to use DECthreads on OSF/1 without Mach threads
 *		and without libc_r.a. The _errno() function (and others)
 *		shouldn't be declared under these circumstances, but are
 *		currently compiled whenever built on an OSF/1-based system.
 *	002	Dave Butenhof	27 November 1991
 *		Under DEC C, use the library's get/set errno access functions
 *		rather than global errno.
 *	003	Webb Scales	25 February 1992
 *		Reorganized errno handling.
 *	004	Webb Scales	20 April 1992
 *		Temporarily returned errno dependency to VAXCRTL for VAX VMS.
 */

#ifndef CMA_INT_ERRNO
#define CMA_INT_ERRNO

/*
 *  INCLUDE FILES
 */
#include <errno.h>
#include <cma_defs.h>
#include <cma_tcb_defs.h>
#include <cma_stack.h>

#ifndef EDEADLK
# define EDEADLK	EWOULDBLOCK
#endif

/*
 * CONSTANTS AND MACROS
 */

/*
 * This symbol determines what sort of errno-processing DECthreads does:
 *	User-program references to "errno" result in:
 *	    STATIC_CELL -   a direct reference to a static cell
 *	    EXTERN_FUNC -   a call to a function which references a static cell
 *	    INTERN_FUNC -   a call to cma_errno() which references the TCB
 */
#define _CMA__STATIC_CELL	1
#define _CMA__EXTERN_FUNC	2
#define _CMA__INTERN_FUNC	3

/*
 * Errno functions
 *
 * FIX-ME:  _CMA_ERRNO_TYPE_ should be _CMA__EXTERN_FUNC on VAX VMS starting
 *          with V6.0 (i.e., remove the hardware test from the #if below).
 */

#ifndef _CMA_ERRNO_TYPE_
# if (_CMA_OS_ == _CMA__VMS) && (_CMA_HARDWARE_ == _CMA__ALPHA)
#  define _CMA_ERRNO_TYPE_	_CMA__EXTERN_FUNC
# else
#  if (_CMA_REENTRANT_CLIB_) && (!(_CMA_UNIX_TYPE ==  _CMA__SVR4))
#   define _CMA_ERRNO_TYPE_	_CMA__INTERN_FUNC
#  else
#   define _CMA_ERRNO_TYPE_	_CMA__STATIC_CELL
#  endif
# endif
#endif


#if _CMA_ERRNO_TYPE_ == _CMA__INTERN_FUNC
# define cma__get_errno()		(cma__get_self_tcb ()->thd_errno)
# define cma__set_errno(value)	(cma__get_self_tcb ()->thd_errno = value)
# define cma__get_thderrno(thd)		(thd->thd_errno)
# define cma__set_thderrno(thd,value)	(thd->thd_errno = value)
#else
# if (_CMA_ERRNO_TYPE_ == _CMA__STATIC_CELL)
#  undef errno
# endif
# define cma__get_errno()		(errno)
# define cma__set_errno(value)		(errno = value)
# define cma__get_thderrno(thd)		(errno)
# define cma__set_thderrno(thd,value)	(errno = value)
#endif


/*
 * TYPEDEFS
 */

/*
 *  GLOBAL DATA
 */

/*
 * INTERNAL INTERFACES
 */

#if (_CMA_OSIMPL_ == _CMA__OS_OSF) && _CMA_REENTRANT_CLIB_
extern int
geterrno _CMA_PROTOTYPE_ ((void));

extern void
seterrno _CMA_PROTOTYPE_ ((int value));

extern int *
_errno _CMA_PROTOTYPE_ ((void));
#endif

#endif