1/* linux/aio_abi.h
2 *
3 * Copyright 2000,2001,2002 Red Hat.
4 *
5 * Written by Benjamin LaHaise <bcrl@kvack.org>
6 *
7 * Distribute under the terms of the GPLv2 (see ../../COPYING) or under
8 * the following terms.
9 *
10 * Permission to use, copy, modify, and distribute this software and its
11 * documentation is hereby granted, provided that the above copyright
12 * notice appears in all copies.  This software is provided without any
13 * warranty, express or implied.  Red Hat makes no representations about
14 * the suitability of this software for any purpose.
15 *
16 * IN NO EVENT SHALL RED HAT BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
17 * SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF
18 * THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF RED HAT HAS BEEN ADVISED
19 * OF THE POSSIBILITY OF SUCH DAMAGE.
20 *
21 * RED HAT DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND
24 * RED HAT HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
25 * ENHANCEMENTS, OR MODIFICATIONS.
26 */
27#ifndef __LINUX__AIO_ABI_H
28#define __LINUX__AIO_ABI_H
29
30#include <asm/byteorder.h>
31
32typedef unsigned long	aio_context_t;
33
34enum {
35	IOCB_CMD_PREAD = 0,
36	IOCB_CMD_PWRITE = 1,
37	IOCB_CMD_FSYNC = 2,
38	IOCB_CMD_FDSYNC = 3,
39	/* These two are experimental.
40	 * IOCB_CMD_PREADX = 4,
41	 * IOCB_CMD_POLL = 5,
42	 */
43	IOCB_CMD_NOOP = 6,
44};
45
46/* read() from /dev/aio returns these structures. */
47struct io_event {
48	__u64		data;		/* the data field from the iocb */
49	__u64		obj;		/* what iocb this event came from */
50	__s64		res;		/* result code for this event */
51	__s64		res2;		/* secondary result */
52};
53
54#if defined(__LITTLE_ENDIAN)
55#define PADDED(x,y)	x, y
56#elif defined(__BIG_ENDIAN)
57#define PADDED(x,y)	y, x
58#else
59#error edit for your odd byteorder.
60#endif
61
62/*
63 * we always use a 64bit off_t when communicating
64 * with userland.  its up to libraries to do the
65 * proper padding and aio_error abstraction
66 */
67
68struct iocb {
69	/* these are internal to the kernel/libc. */
70	__u64	aio_data;	/* data to be returned in event's data */
71	__u32	PADDED(aio_key, aio_reserved1);
72				/* the kernel sets aio_key to the req # */
73
74	/* common fields */
75	__u16	aio_lio_opcode;	/* see IOCB_CMD_ above */
76	__s16	aio_reqprio;
77	__u32	aio_fildes;
78
79	__u64	aio_buf;
80	__u64	aio_nbytes;
81	__s64	aio_offset;
82
83	/* extra parameters */
84	__u64	aio_reserved2;	/* TODO: use this for a (struct sigevent *) */
85	__u64	aio_reserved3;
86}; /* 64 bytes */
87
88#undef IFBIG
89#undef IFLITTLE
90
91#endif /* __LINUX__AIO_ABI_H */
92
93