71 lines
1.3 KiB
C
71 lines
1.3 KiB
C
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/*
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* Copyright (c) 2006-2018, 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 "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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int result;
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struct dfs_fd *d;
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struct map_struct mmp;
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/* get the fd */
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d = fd_get(fd);
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if (d == NULL) {
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rt_set_errno(-EBADF);
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return MAP_FAILED;
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}
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if (d->fops->mmap == NULL) {
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rt_set_errno(-ENOSYS);
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goto out;
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}
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/*
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* Here, if we support to map address dynmaic, we need to check
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* the addr is be mapped or not. But if the addr is NULL, we just
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* smpile get the address from filesystem.
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*
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*/
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mmp.start = (unsigned long)addr;
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mmp.end = (unsigned long)addr + length;
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mmp.flags = flags;
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mmp.prot = prot;
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#define PAGE_SHIFT 12
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mmp.pgoff = offset >> PAGE_SHIFT;
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result = d->fops->mmap(d, &mmp);
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if (result < 0) {
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rt_set_errno(result);
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goto out;
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}
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fd_put(d);
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return (void *)mmp.start;
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out:
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/* release the ref-count of fd */
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fd_put(d);
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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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return 0;
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}
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