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1 | /* include/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 <linux/types.h> |
31 | #include <asm/byteorder.h> |
32 | |
33 | typedef unsigned long aio_context_t; |
34 | |
35 | enum { |
36 | IOCB_CMD_PREAD = 0, |
37 | IOCB_CMD_PWRITE = 1, |
38 | IOCB_CMD_FSYNC = 2, |
39 | IOCB_CMD_FDSYNC = 3, |
40 | /* These two are experimental. |
41 | * IOCB_CMD_PREADX = 4, |
42 | * IOCB_CMD_POLL = 5, |
43 | */ |
44 | IOCB_CMD_NOOP = 6, |
45 | IOCB_CMD_PREADV = 7, |
46 | IOCB_CMD_PWRITEV = 8, |
47 | }; |
48 | |
49 | /* |
50 | * Valid flags for the "aio_flags" member of the "struct iocb". |
51 | * |
52 | * IOCB_FLAG_RESFD - Set if the "aio_resfd" member of the "struct iocb" |
53 | * is valid. |
54 | */ |
55 | #define IOCB_FLAG_RESFD (1 << 0) |
56 | |
57 | /* read() from /dev/aio returns these structures. */ |
58 | struct io_event { |
59 | __u64 data; /* the data field from the iocb */ |
60 | __u64 obj; /* what iocb this event came from */ |
61 | __s64 res; /* result code for this event */ |
62 | __s64 res2; /* secondary result */ |
63 | }; |
64 | |
65 | #if defined(__LITTLE_ENDIAN) |
66 | #define PADDED(x,y) x, y |
67 | #elif defined(__BIG_ENDIAN) |
68 | #define PADDED(x,y) y, x |
69 | #else |
70 | #error edit for your odd byteorder. |
71 | #endif |
72 | |
73 | /* |
74 | * we always use a 64bit off_t when communicating |
75 | * with userland. its up to libraries to do the |
76 | * proper padding and aio_error abstraction |
77 | */ |
78 | |
79 | struct iocb { |
80 | /* these are internal to the kernel/libc. */ |
81 | __u64 aio_data; /* data to be returned in event's data */ |
82 | __u32 PADDED(aio_key, aio_reserved1); |
83 | /* the kernel sets aio_key to the req # */ |
84 | |
85 | /* common fields */ |
86 | __u16 aio_lio_opcode; /* see IOCB_CMD_ above */ |
87 | __s16 aio_reqprio; |
88 | __u32 aio_fildes; |
89 | |
90 | __u64 aio_buf; |
91 | __u64 aio_nbytes; |
92 | __s64 aio_offset; |
93 | |
94 | /* extra parameters */ |
95 | __u64 aio_reserved2; /* TODO: use this for a (struct sigevent *) */ |
96 | |
97 | /* flags for the "struct iocb" */ |
98 | __u32 aio_flags; |
99 | |
100 | /* |
101 | * if the IOCB_FLAG_RESFD flag of "aio_flags" is set, this is an |
102 | * eventfd to signal AIO readiness to |
103 | */ |
104 | __u32 aio_resfd; |
105 | }; /* 64 bytes */ |
106 | |
107 | #undef IFBIG |
108 | #undef IFLITTLE |
109 | |
110 | #endif /* __LINUX__AIO_ABI_H */ |
111 | |
112 |
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