xref: /illumos-gate/usr/src/cmd/sendmail/db/include/os.h (revision 2a8bcb4e)
1 /*-
2  * See the file LICENSE for redistribution information.
3  *
4  * Copyright (c) 1997, 1998
5  *	Sleepycat Software.  All rights reserved.
6  *
7  *	@(#)os.h	10.11 (Sleepycat) 10/12/98
8  */
9 
10 /*
11  * We group seek/write calls into a single function so that we can use
12  * pread(2)/pwrite(2) where they're available.
13  */
14 #define	DB_IO_READ	1
15 #define	DB_IO_WRITE	2
16 typedef struct __io {
17 	int	    fd_io;		/* I/O file descriptor. */
18 	int	    fd_lock;		/* Locking file descriptor. */
19 	db_mutex_t *mutexp;		/* Mutex to lock. */
20 	size_t	    pagesize;		/* Page size. */
21 	db_pgno_t   pgno;		/* Page number. */
22 	u_int8_t   *buf;		/* Buffer. */
23 	size_t	    bytes;		/* Bytes read/written. */
24 } DB_IO;
25