/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1997, 1998, 1999
 *	Sleepycat Software.  All rights reserved.
 *
 * $Id: os.h,v 1.1.1.3.2.2 2000/02/08 00:47:17 noriko Exp $
 */

/*
 * Filehandle.
 */
struct __fh_t {
#if defined(_WIN32)
	HANDLE	  handle;		/* Windows/32 file handle. */
#endif
	int	  fd;			/* POSIX file descriptor. */

	u_int32_t log_size;		/* XXX: Log file size. */

#define	DB_FH_NOSYNC	0x01		/* Handle doesn't need to be sync'd. */
#define	DB_FH_VALID	0x02		/* Handle is valid. */
	u_int8_t flags;
};

/*
 * We group certain seek/write calls into a single function so that we
 * can use pread(2)/pwrite(2) where they're available.
 */
#define	DB_IO_READ	1
#define	DB_IO_WRITE	2
typedef struct __io_t {
	DB_FH	  *fhp;			/* I/O file handle. */
	MUTEX	  *mutexp;		/* Mutex to lock. */
	size_t	   pagesize;		/* Page size. */
	db_pgno_t  pgno;		/* Page number. */
	u_int8_t  *buf;			/* Buffer. */
	size_t	   bytes;		/* Bytes read/written. */
} DB_IO;
