78 lines
1.3 KiB
C
78 lines
1.3 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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* 2015-01-28 Bernard first version
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*/
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#include <rtthread.h>
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#include <LowLevelIOInterface.h>
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#include <fcntl.h>
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/*
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* The "__open" function opens the file named "filename" as specified
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* by "mode".
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*/
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#pragma module_name = "?__open"
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int __open(const char *filename, int mode)
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{
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#ifdef DFS_USING_POSIX
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int handle;
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int open_mode = O_RDONLY;
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if (mode & _LLIO_CREAT)
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{
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open_mode |= O_CREAT;
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/* Check what we should do with it if it exists. */
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if (mode & _LLIO_APPEND)
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{
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/* Append to the existing file. */
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open_mode |= O_APPEND;
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}
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if (mode & _LLIO_TRUNC)
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{
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/* Truncate the existsing file. */
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open_mode |= O_TRUNC;
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}
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}
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if (mode & _LLIO_TEXT)
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{
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/* we didn't support text mode */
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}
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switch (mode & _LLIO_RDWRMASK)
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{
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case _LLIO_RDONLY:
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break;
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case _LLIO_WRONLY:
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open_mode |= O_WRONLY;
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break;
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case _LLIO_RDWR:
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/* The file should be opened for both reads and writes. */
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open_mode |= O_RDWR;
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break;
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default:
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return _LLIO_ERROR;
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}
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handle = open(filename, open_mode, 0);
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if (handle < 0)
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return _LLIO_ERROR;
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return handle;
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#else
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return _LLIO_ERROR;
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#endif /* DFS_USING_POSIX */
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}
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