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#ifndef _SYS_UNISTD_H
#define _SYS_UNISTD_H
#include <rtthread.h>
#ifdef RT_USING_DFS
#define STDIN_FILENO 0 /* standard input file descriptor */
#define STDOUT_FILENO 1 /* standard output file descriptor */
#define STDERR_FILENO 2 /* standard error file descriptor */
#include <dfs_posix.h>
#else
#define _FREAD 0x0001 /* read enabled */
#define _FWRITE 0x0002 /* write enabled */
#define _FAPPEND 0x0008 /* append (writes guaranteed at the end) */
#define _FMARK 0x0010 /* internal; mark during gc() */
#define _FDEFER 0x0020 /* internal; defer for next gc pass */
#define _FASYNC 0x0040 /* signal pgrp when data ready */
#define _FSHLOCK 0x0080 /* BSD flock() shared lock present */
#define _FEXLOCK 0x0100 /* BSD flock() exclusive lock present */
#define _FCREAT 0x0200 /* open with file create */
#define _FTRUNC 0x0400 /* open with truncation */
#define _FEXCL 0x0800 /* error on open if file exists */
#define _FNBIO 0x1000 /* non blocking I/O (sys5 style) */
#define _FSYNC 0x2000 /* do all writes synchronously */
#define _FNONBLOCK 0x4000 /* non blocking I/O (POSIX style) */
#define _FNDELAY _FNONBLOCK /* non blocking I/O (4.2 style) */
#define _FNOCTTY 0x8000 /* don't assign a ctty on this open */
#define O_RDONLY 0 /* +1 == FREAD */
#define O_WRONLY 1 /* +1 == FWRITE */
#define O_RDWR 2 /* +1 == FREAD|FWRITE */
#define O_APPEND _FAPPEND
#define O_CREAT _FCREAT
#define O_TRUNC _FTRUNC
#define O_EXCL _FEXCL
#define O_SYNC _FSYNC
#endif
#endif /* _SYS_UNISTD_H */
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