xref: /onnv-gate/usr/src/cmd/sendmail/db/include/os.h (revision 0:68f95e015346)
1*0Sstevel@tonic-gate /*-
2*0Sstevel@tonic-gate  * See the file LICENSE for redistribution information.
3*0Sstevel@tonic-gate  *
4*0Sstevel@tonic-gate  * Copyright (c) 1997, 1998
5*0Sstevel@tonic-gate  *	Sleepycat Software.  All rights reserved.
6*0Sstevel@tonic-gate  *
7*0Sstevel@tonic-gate  *	@(#)os.h	10.11 (Sleepycat) 10/12/98
8*0Sstevel@tonic-gate  */
9*0Sstevel@tonic-gate 
10*0Sstevel@tonic-gate #pragma ident	"%Z%%M%	%I%	%E% SMI"
11*0Sstevel@tonic-gate 
12*0Sstevel@tonic-gate /*
13*0Sstevel@tonic-gate  * We group seek/write calls into a single function so that we can use
14*0Sstevel@tonic-gate  * pread(2)/pwrite(2) where they're available.
15*0Sstevel@tonic-gate  */
16*0Sstevel@tonic-gate #define	DB_IO_READ	1
17*0Sstevel@tonic-gate #define	DB_IO_WRITE	2
18*0Sstevel@tonic-gate typedef struct __io {
19*0Sstevel@tonic-gate 	int	    fd_io;		/* I/O file descriptor. */
20*0Sstevel@tonic-gate 	int	    fd_lock;		/* Locking file descriptor. */
21*0Sstevel@tonic-gate 	db_mutex_t *mutexp;		/* Mutex to lock. */
22*0Sstevel@tonic-gate 	size_t	    pagesize;		/* Page size. */
23*0Sstevel@tonic-gate 	db_pgno_t   pgno;		/* Page number. */
24*0Sstevel@tonic-gate 	u_int8_t   *buf;		/* Buffer. */
25*0Sstevel@tonic-gate 	size_t	    bytes;		/* Bytes read/written. */
26*0Sstevel@tonic-gate } DB_IO;
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