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/****************************************************************************
* include/sys/mman.h
*
* Copyright (C) 2008, 2009, 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
#ifndef __INCLUDE_SYS_MMAN_H
#define __INCLUDE_SYS_MMAN_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
/****************************************************************************
* Pre-Processor Definitions
****************************************************************************/
/* Protections are chosen from these bits, OR'd together. NuttX does not
* support any of these, but are provided for source level compatibility
*/
#define PROT_NONE 0x0 /* Page may not be accessed */
#define PROT_READ 0x1 /* Page may be read */
#define PROT_WRITE 0x2 /* Page may be written */
#define PROT_EXEC 0x4 /* Page may be executed */
/* Sharing types -- ignored by NuttX. */
#define MAP_SHARED 0x00001 /* Share this mapping */
#define MAP_PRIVATE 0x00002 /* Create a private copy-on-write mapping */
#define MAP_TYPE 0x0000f /* Mask for type of mapping */
#define MAP_FIXED 0x00010 /* Map to specified address exactly */
#define MAP_FILE 0x00000 /* The mapping is backed by a file */
#define MAP_ANONYMOUS 0x00020 /* The mapping is not backed by any file */
#define MAP_ANON MAP_ANONYMOUS
/* These are Linux-specific. */
#define MAP_GROWSDOWN 0x00100 /* Used to stack allocations */
#define MAP_DENYWRITE 0x00800 /* Do not permit writes to file */
#define MAP_EXECUTABLE 0x01000 /* Mark it as an executable */
#define MAP_LOCKED 0x02000 /* Lock pages mapped into memory */
#define MAP_NORESERVE 0x04000 /* Do not reserve swap space for this mapping */
#define MAP_POPULATE 0x08000 /* Populate (prefault) pagetables */
#define MAP_NONBLOCK 0x10000 /* Do not block on IO */
/* Failure return */
#define MAP_FAILED ((void*)-1)
/****************************************************************************
* Public Type Definitions
****************************************************************************/
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
#undef EXTERN
#if defined(__cplusplus)
#define EXTERN extern "C"
extern "C" {
#else
#define EXTERN extern
#endif
EXTERN FAR void *mmap(FAR void *start, size_t length, int prot, int flags,
int fd, off_t offset);
#ifdef CONFIG_FS_RAMMAP
EXTERN int munmap(FAR void *start, size_t length);
#else
# define munmap(start, length)
#endif
#undef EXTERN
#if defined(__cplusplus)
}
#endif
#endif /* __INCLUDE_SYS_MMAN_H */
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