178 lines
6.9 KiB
C
178 lines
6.9 KiB
C
/****************************************************************************
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* include/sys/mman.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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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* yet 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 (1 << 0) /* Bit 0: Page may be read */
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#define PROT_WRITE (1 << 1) /* Bit 1: Page may be written */
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#define PROT_EXEC (1 << 2) /* Bit 2: Page may be executed */
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/* mmpa() flags bits. Only MAP_SHARED, MAP_PRIVATE, and MAP_FIXED are
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* specified by OpenGroup.org. The rest are unique to NuttX or are
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* definitions used by other systems.
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*/
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/* Sharing types (most are not implemented). */
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#define MAP_SHARED (1 << 0) /* Bit 0: Share this mapping */
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#define MAP_PRIVATE (1 << 1) /* Bit 1: Create a private copy-on-write mapping */
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#define MAP_TYPE (3 << 0) /* Mask for type of mapping */
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#define MAP_FIXED (1 << 2) /* Bit 2: Map to specified address exactly */
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#define MAP_FILE (1 << 3) /* Bit 3: The mapping is backed by a file */
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#define MAP_ANONYMOUS (1 << 4) /* Bit 4: The mapping is not backed by any file */
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#define MAP_ANON MAP_ANONYMOUS /* Alias */
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/* These are Linux-specific (none are implemented). */
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#define MAP_GROWSDOWN (1 << 5) /* Bit 5: Used to stack allocations */
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#define MAP_DENYWRITE (1 << 6) /* Bit 6: Do not permit writes to file */
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#define MAP_EXECUTABLE (1 << 7) /* Bit 7: Mark it as an executable */
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#define MAP_LOCKED (1 << 8) /* Bit 8: Lock pages mapped into memory */
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#define MAP_NORESERVE (1 << 9) /* Bit 9: Do not reserve swap space for this mapping */
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#define MAP_POPULATE (1 << 10) /* Bit 10: populate (prefault) page tables */
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#define MAP_NONBLOCK (1 << 11) /* Bit 11: Do not block on IO */
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/* Failure return */
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#define MAP_FAILED ((void*)-1)
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/* The following flags are used with msync() */
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#define MS_ASYNC 0x01 /* Perform asynchronous writes */
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#define MS_SYNC 0x02 /* Perform synchronous writes */
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#define MS_INVALIDATE 0x04 /* Invalidate mapping */
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/* The following flags are used with mlockall() */
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#define MCL_CURRENT 0x01 /* Lock currently mapped pages */
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#define MCL_FUTURE 0x02 /* Lock pages that become mapped */
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/* If the Advisory Information and either the Memory Mapped Files or Shared
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* Memory Objects options are supported, values for advice used by
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* posix_madvise() are defined as follows:
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*
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* POSIX_MADV_NORMAL
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* The application has no advice to give on its behavior with respect to
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* the specified range. It is the default characteristic if no advice is
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* given for a range of memory.
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* POSIX_MADV_SEQUENTIAL
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* The application expects to access the specified range sequentially from
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* lower addresses to higher addresses.
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* POSIX_MADV_RANDOM
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* The application expects to access the specified range in a random order.
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* POSIX_MADV_WILLNEED
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* The application expects to access the specified range in the near
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* future.
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* POSIX_MADV_DONTNEED
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* The application expects that it will not access the specified range in
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* the near future.
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*/
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#define POSIX_MADV_NORMAL (0)
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#define POSIX_MADV_SEQUENTIAL (1)
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#define POSIX_MADV_RANDOM (2)
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#define POSIX_MADV_WILLNEED (3)
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#define POSIX_MADV_DONTNEED (4)
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/* The following flags are defined for posix_typed_mem_open():
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*
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* POSIX_TYPED_MEM_ALLOCATE
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* Allocate on mmap().
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* POSIX_TYPED_MEM_ALLOCATE_CONTIG
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* Allocate contiguously on mmap().
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* POSIX_TYPED_MEM_MAP_ALLOCATABLE
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* Map on mmap(), without affecting allocatability.
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*/
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#define POSIX_TYPED_MEM_ALLOCATE (0)
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#define POSIX_TYPED_MEM_ALLOCATE_CONTIG (1)
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#define POSIX_TYPED_MEM_MAP_ALLOCATABLE (2)
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/****************************************************************************
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* Public Type Definitions
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****************************************************************************/
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struct posix_typed_mem_info
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{
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size_t posix_tmi_length; /* Maximum length which may be allocated from a
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* typed memory object */
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};
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/****************************************************************************
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* Public Data
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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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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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int mlock(FAR const void *addr, size_t len);
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int mlockall(int flags);
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FAR void *mmap(FAR void *start, size_t length, int prot, int flags, int fd,
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off_t offset);
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int mprotect(FAR void *addr, size_t len, int prot);
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int msync(FAR void *addr, size_t len, int flags);
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int munlock(FAR const void *addr, size_t len);
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int munlockall(void);
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int munmap(FAR void *start, size_t length);
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int posix_madvise(FAR void *addr, size_t len, int advice);
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int posix_mem_offset(FAR const void *addr, size_t len, FAR off_t *off,
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FAR size_t *contig_len, FAR int *fildes);
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int posix_typed_mem_get_info(int fildes,
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FAR struct posix_typed_mem_info *info);
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int posix_typed_mem_open(FAR const char *name, int oflag, int tflag);
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int shm_open(FAR const char *name, int oflag, mode_t mode);
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int shm_unlink(FAR const char *name);
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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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