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113 lines
4.6 KiB
113 lines
4.6 KiB
/**************************************************************************** |
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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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