#ifndef _SYS_UNISTD_H
#define _SYS_UNISTD_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 */