67 lines
2.7 KiB
C
67 lines
2.7 KiB
C
/*
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* Copyright (c) 2006-2021, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2017/11/30 Bernard The first version.
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* 2024/03/29 TroyMitchelle Add comments for all macros
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*/
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#ifndef __SYS_MMAN_H__
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#define __SYS_MMAN_H__
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <sys/types.h>
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#define MAP_FAILED ((void *) -1)
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/* mmap flags */
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#define MAP_SHARED 0x01 /**< Share the mapping with other processes. */
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#define MAP_PRIVATE 0x02 /**< Create a private copy-on-write mapping. */
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#define MAP_TYPE 0x0f /**< Mask for type of mapping. */
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#define MAP_FIXED 0x10 /**< Interpret addr exactly. */
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#define MAP_ANON 0x20 /**< Anonymous mapping. */
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#define MAP_ANONYMOUS MAP_ANON /**< Synonym for MAP_ANON. */
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#define MAP_NORESERVE 0x4000 /**< Don't reserve swap space for this mapping. */
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#define MAP_GROWSDOWN 0x0100 /**< Stack-like segment. */
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#define MAP_DENYWRITE 0x0800 /**< ETXTBSY. */
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#define MAP_EXECUTABLE 0x1000 /**< Mark it as an executable. */
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#define MAP_LOCKED 0x2000 /**< Lock the mapping's pages. */
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#define MAP_POPULATE 0x8000 /**< Populate (prefault) pagetables. */
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#define MAP_NONBLOCK 0x10000 /**< Do not block on IO. */
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#define MAP_STACK 0x20000 /**< Allocation is a stack segment. */
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#define MAP_HUGETLB 0x40000 /**< Create a huge page mapping. */
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#define MAP_FILE 0 /**< Compatibility */
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/* mmap protections */
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#define PROT_NONE 0 /**< No access. */
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#define PROT_READ 1 /**< Page can be read. */
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#define PROT_WRITE 2 /**< Page can be written. */
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#define PROT_EXEC 4 /**< Page can be executed. */
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#define PROT_GROWSDOWN 0x01000000/**< Extend change to start of growsdown vma (mprotect only). */
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#define PROT_GROWSUP 0x02000000/**< Extend change to start of growsup vma (mprotect only). */
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/* msync flags */
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#define MS_ASYNC 1 /**< Perform asynchronous writes. */
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#define MS_INVALIDATE 2 /**< Invalidate mappings after writing. */
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#define MS_SYNC 4 /**< Perform synchronous writes. */
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/* mlockall flags */
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#define MCL_CURRENT 1 /**< Lock all pages which are currently mapped into the address space of the process. */
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#define MCL_FUTURE 2 /**< Lock all pages which will become mapped into the address space of the process in the future. */
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#define MCL_ONFAULT 4 /**< Lock all pages which are currently mapped into the address space of the process on access. */
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void *mmap (void *start, size_t len, int prot, int flags, int fd, off_t off);
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int munmap (void *start, size_t len);
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#ifdef __cplusplus
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}
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#endif
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#endif
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