/**************************************************************************** * include/sys/mman.h * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. The * ASF licenses this file to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance with the * License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. * ****************************************************************************/ #ifndef __INCLUDE_SYS_MMAN_H #define __INCLUDE_SYS_MMAN_H /**************************************************************************** * Included Files ****************************************************************************/ #include #include /**************************************************************************** * 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 (1 << 0) /* Bit 0: Page may be read */ #define PROT_WRITE (1 << 1) /* Bit 1: Page may be written */ #define PROT_EXEC (1 << 2) /* Bit 2: Page may be executed */ /* mmpa() flags bits. Only MAP_SHARED, MAP_PRIVATE, and MAP_FIXED are * specified by OpenGroup.org. The rest are unique to NuttX or are * definitions used by other systems. */ /* Sharing types (most are not implemented). */ #define MAP_SHARED (1 << 0) /* Bit 0: Share this mapping */ #define MAP_PRIVATE (1 << 1) /* Bit 1: Create a private copy-on-write mapping */ #define MAP_TYPE (3 << 0) /* Mask for type of mapping */ #define MAP_FIXED (1 << 2) /* Bit 2: Map to specified address exactly */ #define MAP_FILE (1 << 3) /* Bit 3: The mapping is backed by a file */ #define MAP_ANONYMOUS (1 << 4) /* Bit 4: The mapping is not backed by any file */ #define MAP_ANON MAP_ANONYMOUS /* Alias */ /* These are Linux-specific (none are implemented). */ #define MAP_GROWSDOWN (1 << 5) /* Bit 5: Used to stack allocations */ #define MAP_DENYWRITE (1 << 6) /* Bit 6: Do not permit writes to file */ #define MAP_EXECUTABLE (1 << 7) /* Bit 7: Mark it as an executable */ #define MAP_LOCKED (1 << 8) /* Bit 8: Lock pages mapped into memory */ #define MAP_NORESERVE (1 << 9) /* Bit 9: Do not reserve swap space for this mapping */ #define MAP_POPULATE (1 << 10) /* Bit 10: opulate (prefault) page tables */ #define MAP_NONBLOCK (1 << 11) /* Bit 11: 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); int munmap(FAR void *start, size_t length); 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 */