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- /****************************************************************************
- *
- * $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 <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 */
-