/* ==== fd.h ============================================================
 * Copyright (c) 1993 by Chris Provenzano, proven@mit.edu
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *  This product includes software developed by Chris Provenzano.
 * 4. The name of Chris Provenzano may not be used to endorse or promote 
 *	  products derived from this software without specific prior written
 *	  permission.
 *
 * THIS SOFTWARE IS PROVIDED BY CHRIS PROVENZANO ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL CHRIS PROVENZANO BE LIABLE FOR ANY 
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
 * SUCH DAMAGE.
 *
 * $Id: fd.h,v 1.3 1994/02/07 22:02:29 proven Exp $ $provenid: fd.h,v 1.17 1994/02/07 03:31:54 proven Exp $
 *
 * Description : Basic fd header.
 *
 *  1.00 93/08/14 proven
 *      -Started coding this file.
 *
 *	1.01 93/11/13 proven
 *		-The functions readv() and writev() added
 */

/*
 * New pthread types.
 */
enum fd_type {
	FD_NT,					/* Not tested */
	FD_NIU,					/* Known to be not in use */
	FD_HALF_DUPLEX,			/* Files, and seeking devices */
	FD_FULL_DUPLEX			/* pipes, sockets, drivers, ... */
};


#define FD_READ				0x1
#define FD_WRITE			0x2
#define FD_RDWR				(FD_READ | FD_WRITE)

struct fd_ops {
	int 					(*write)();
	int 					(*read)();
	int						(*close)();
	int						(*fcntl)();
	int						(*writev)();
	int						(*readv)();
	int						(*seek)();
};

union fd_data {
	void 					*ptr;
	int						i;
};

struct fd_table_entry {
	struct pthread_queue	r_queue;
	struct pthread_queue	w_queue;
	struct pthread			*r_owner;
	struct pthread			*w_owner;
	semaphore				lock;
	struct fd_table_entry	*next;
	struct fd_ops			*ops;
	enum fd_type			type;
	int						lockcount;		/* Count for FILE locks */
	int						count;

	/* data that needs to be passed to the type dependent fd */
	int						flags;
	union fd_data			fd;
};

/*
 * Important data structure
 */
extern struct fd_table_entry *fd_table[];
extern int dtablesize;

/*
 * New functions
 */

__BEGIN_DECLS

#if defined(PTHREAD_KERNEL)

#endif

__END_DECLS