68 lines
1.1 KiB
C
68 lines
1.1 KiB
C
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/*
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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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*/
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#include <stdint.h>
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#include <stdio.h>
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#include <rtthread.h>
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#include <dfs_posix.h>
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#include <sys/mman.h>
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void *mmap(void *addr, size_t length, int prot, int flags,
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int fd, off_t offset)
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{
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uint8_t *mem;
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if (addr)
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{
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mem = addr;
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}
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else mem = (uint8_t *)malloc(length);
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if (mem)
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{
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off_t cur;
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size_t read_bytes;
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cur = lseek(fd, 0, SEEK_SET);
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lseek(fd, offset, SEEK_SET);
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read_bytes = read(fd, mem, length);
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if (read_bytes != length)
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{
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if (addr == RT_NULL)
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{
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/* read failed */
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free(mem);
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mem = RT_NULL;
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}
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}
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lseek(fd, cur, SEEK_SET);
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return mem;
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}
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errno = ENOMEM;
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return MAP_FAILED;
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}
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int munmap(void *addr, size_t length)
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{
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if (addr)
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{
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free(addr);
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return 0;
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}
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return -1;
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}
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