/*
 *	FCNTL.H
 */

#ifndef	_FCNTL_H
#define	_FCNTL_H

#define	O_RDONLY	0x00		/* read only */
#define	O_WRONLY	0x01		/* write only */
#define	O_RDWR		0x02		/* read/write */
#define O_ACCMODE	0x03		/* used to mask off file access mode */

/* file sharing modes (not POSIX) */
#define O_COMPAT	0x00		/* old TOS compatibility mode */
#define O_DENYRW	0x10		/* deny both reads and writes */
#define O_DENYW		0x20
#define O_DENYR		0x30
#define O_DENYNONE	0x40		/* don't deny anything */
#define O_SHMODE	0x70		/* mask for file sharing mode */

#define	O_NDELAY	0x100		/* Non-blocking I/O */
#define O_SYNC		0x00		/* sync after writes (not implemented) */

/* the following flags are not passed to the OS */
#define	O_CREAT		0x200		/* create new file if needed */
#define	O_TRUNC		0x400		/* make file 0 length */
#define	O_EXCL		0x800		/* error if file exists */
#define	O_APPEND	0x1000		/* position at EOF */

/*
 * defines for the access() function
 */
#define	F_OK			0
#define	X_OK			1
#define	W_OK			2
#define	R_OK			4

/*
 * defines for fcntl()
 */
#define	F_DUPFD		0	/* Duplicate fildes */
#define	F_GETFD		1	/* Get fildes flags */
#define	F_SETFD		2	/* Set fildes flags */
#define	F_GETFL		3	/* Get file flags */
#define	F_SETFL		4	/* Set file flags */
#define F_GETLK		5	/* Get file lock */
#define F_SETLK		6	/* Set file lock */

struct flock {
	short l_type;
#define F_RDLCK		O_RDONLY
#define F_WRLCK		O_WRONLY
#define F_UNLCK		3
	short l_whence;
	long l_start;
	long l_len;
	short l_pid;
};

#ifndef _COMPILER_H
#include <compiler.h>
#endif

__EXTERN int	fcntl __PROTO((int, int, void *));
/* maybe more later */

/*
 * stuff for speeding up isatty(), and other library internal defines
 */

#define __NHANDLES 40
#ifdef __MSHORT__
#define __SMALLEST_VALID_HANDLE (-3)
#else
#define __SMALLEST_VALID_HANDLE (0)
#endif

#define __OPEN_INDEX(fd) ((short)(fd) + 3)

struct __open_file {
	short	status;		/* whether or not it's a tty */
	short	flags;		/* if a tty, its flags */
};

extern struct __open_file __open_stat[__NHANDLES];

#define FH_UNKNOWN	0
#define FH_ISATTY	1
#define FH_ISAFILE	2

#ifndef _COMPILER_H
#include <compiler.h>
#endif

__EXTERN int fcntl __PROTO((int f, int cmd, void *arg));

#endif /* _FCNTL_H */