/****************************************************************************
 *
 * $Source: /usr/local/cvsroot/gccsdk/unixlib/source/clib/sys/mman.h,v $
 * $Date: 2004/04/17 10:51:15 $
 * $Revision: 1.4 $
 * $State: Exp $
 * $Author: nick $
 *
 ***************************************************************************/

/* Definitions for BSD-style memory management.  Generic/4.4 BSD version.
   sys/mman.h: Written by Peter Burwood, 1 November 1996, June 1997 */

/* These are the bits used by 4.4 BSD and its derivatives.  On systems
   (such as GNU) where these facilities are not system services but can be
   emulated in the C library, these are the definitions we emulate.  */

#ifndef	__SYS_MMAN_H
#define	__SYS_MMAN_H

#ifndef __UNIXLIB_FEATURES_H
#include <unixlib/features.h>
#endif

#include <sys/types.h>

__BEGIN_DECLS

/* Protections are chosen from these bits, OR'd together.  The
   implementation does not necessarily support PROT_EXEC or PROT_WRITE
   without PROT_READ.  The only guarantees are that no writing will be
   allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */

#define	PROT_NONE	0x00	/* No access.  */
#define	PROT_READ	0x04	/* Pages can be read.  */
#define	PROT_WRITE	0x02	/* Pages can be written.  */
#define	PROT_EXEC	0x01	/* Pages can be executed.  */

/* Return value of mmap in case of errors.  */
#define MAP_FAILED ((void *) -1)

/* Flags contain mapping type, sharing type and options.  */

/* Mapping type (must choose one and only one of these).  */
#define	MAP_FILE	0x0001	/* Mapped from a file or device.  */
#define	MAP_ANON	0x0002	/* Allocated from anonymous virtual memory.  */
#define	MAP_TYPE	0x000f	/* Mask for type field.  */

/* Sharing types (must choose one and only one of these).  */
#define	MAP_COPY	0x0020	/* Virtual copy of region at mapping time.  */
#define	MAP_SHARED	0x0010	/* Share changes.  */
#define	MAP_PRIVATE	0x0000	/* Changes private; copy pages on write.  */

/* Other flags.  */
#define	MAP_FIXED	0x0100	/* Map address must be exactly as requested. */
#define	MAP_NOEXTEND	0x0200	/* For MAP_FILE, don't change file size.  */
#define	MAP_HASSEMPHORE	0x0400	/* Region may contain semaphores.  */
#define	MAP_INHERIT	0x0800	/* Region is retained after exec.  */

/* Advice to `madvise'.  */
#define	MADV_NORMAL	0	/* No further special treatment.  */
#define	MADV_RANDOM	1	/* Expect random page references.  */
#define	MADV_SEQUENTIAL	2	/* Expect sequential page references.  */
#define	MADV_WILLNEED	3	/* Will need these pages.  */
#define	MADV_DONTNEED	4	/* Don't need these pages.  */

/* Flags for `mremap'.  */
#define MREMAP_MAYMOVE	1	/* May move the pages when remapping.  */

/* Map addresses starting near ADDR and extending for LEN bytes.  from
   OFFSET into the file FD describes according to PROT and FLAGS.  If ADDR
   is nonzero, it is the desired mapping address.  If the MAP_FIXED bit is
   set in FLAGS, the mapping will be at ADDR exactly (which must be
   page-aligned); otherwise the system chooses a convenient nearby address.
   The return value is the actual mapping address chosen or (caddr_t) -1
   for errors (in which case `errno' is set).  A successful `mmap' call
   deallocates any previous mapping for the affected region.  */

extern __caddr_t mmap (__caddr_t __addr, size_t __len,
		       int __prot, int __flags, int __fd,
		       off_t __offset) __THROW;

/* Deallocate any mapping for the region starting at ADDR and extending LEN
   bytes.  Returns 0 if successful, -1 for errors (and sets errno).  */
extern int munmap (__caddr_t __addr, size_t __len) __THROW;

/* Change the memory protection of the region starting at ADDR and
   extending LEN bytes to PROT.  Returns 0 if successful, -1 for errors
   (and sets errno).  */
/* Not supported.  */
extern int mprotect (__caddr_t __addr, size_t __len, int __prot) __THROW;

/* Synchronize the region starting at ADDR and extending LEN bytes with the
   file it maps.  Filesystem operations on a file being mapped are
   unpredictable before this is done.  */
/* Not supported.  */
extern int msync (__caddr_t __addr, size_t __len) __THROW;

/* Advise the system about particular usage patterns the program follows
   for the region starting at ADDR and extending LEN bytes.  */
/* Not supported.  */
extern int madvise (__caddr_t __addr, size_t __len, int __advice) __THROW;

/* Remap addresses mapped by the range [ADDR,ADDR+OLD_LEN) to new length
   NEW_LEN.  If MAY_MOVE is MREMAP_MAYMOVE the returned address may differ
   from ADDR.  The return value is the actual mapping address chosen or
   (caddr_t) -1 for errors (in which case `errno' is set).  */
extern __caddr_t mremap (__caddr_t __addr, size_t __old_len,
			 size_t __new_len, int __may_move) __THROW;

__END_DECLS

#endif	/* sys/mman.h */
