/****************************************************************************
* include/sys/mman.h
*
* Copyright (C) 2008, 2009, 2011, 2014 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
* yet 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)
/* The following flags are used with msync() */
#define MS_ASYNC 0x01 /* Perform asynchronous writes */
#define MS_SYNC 0x02 /* Perform synchronous writes */
#define MS_INVALIDATE 0x04 /* Invalidate mapping */
/* The following flags are used with mlockall() */
#define MCL_CURRENT 0x01 /* Lock currently mapped pages */
#define MCL_FUTURE 0x02 /* Lock pages that become mapped */
/* If the Advisory Information and either the Memory Mapped Files or Shared
* Memory Objects options are supported, values for advice used by
* posix_madvise() are defined as follows:
*
* POSIX_MADV_NORMAL
* The application has no advice to give on its behavior with respect to
* the specified range. It is the default characteristic if no advice is
* given for a range of memory.
* POSIX_MADV_SEQUENTIAL
* The application expects to access the specified range sequentially from
* lower addresses to higher addresses.
* POSIX_MADV_RANDOM
* The application expects to access the specified range in a random order.
* POSIX_MADV_WILLNEED
* The application expects to access the specified range in the near
* future.
* POSIX_MADV_DONTNEED
* The application expects that it will not access the specified range in
* the near future.
*/
#define POSIX_MADV_NORMAL (0)
#define POSIX_MADV_SEQUENTIAL (1)
#define POSIX_MADV_RANDOM (2)
#define POSIX_MADV_WILLNEED (3)
#define POSIX_MADV_DONTNEED (4)
/* The following flags are defined for posix_typed_mem_open():
*
* POSIX_TYPED_MEM_ALLOCATE
* Allocate on mmap().
* POSIX_TYPED_MEM_ALLOCATE_CONTIG
* Allocate contiguously on mmap().
* POSIX_TYPED_MEM_MAP_ALLOCATABLE
* Map on mmap(), without affecting allocatability.
*/
#define POSIX_TYPED_MEM_ALLOCATE (0)
#define POSIX_TYPED_MEM_ALLOCATE_CONTIG (1)
#define POSIX_TYPED_MEM_MAP_ALLOCATABLE (2)
/****************************************************************************
* Public Type Definitions
****************************************************************************/
struct posix_typed_mem_info
{
size_t posix_tmi_length; /* Maximum length which may be allocated from a
* typed memory object */
};
/****************************************************************************
* Public Data
****************************************************************************/
#undef EXTERN
#if defined(__cplusplus)
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
int mlock(FAR const void *addr, size_t len);
int mlockall(int flags);
FAR void *mmap(FAR void *start, size_t length, int prot, int flags, int fd,
off_t offset);
int mprotect(FAR void *addr, size_t len, int prot);
int msync(FAR void *addr, size_t len, int flags);
int munlock(FAR const void *addr, size_t len);
int munlockall(void);
#ifdef CONFIG_FS_RAMMAP
int munmap(FAR void *start, size_t length);
#else
# define munmap(start, length)
#endif
int posix_madvise(FAR void *addr, size_t len, int advice);
int posix_mem_offset(FAR const void *addr, size_t len, FAR off_t *off,
FAR size_t *contig_len, FAR int *fildes);
int posix_typed_mem_get_info(int fildes, FAR struct posix_typed_mem_info *info);
int posix_typed_mem_open(FAR const char *name, int oflag, int tflag);
int shm_open(FAR const char *name, int oflag, mode_t mode);
int shm_unlink(FAR const char *name);
#undef EXTERN
#if defined(__cplusplus)
}
#endif
#endif /* __INCLUDE_SYS_MMAN_H */
