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