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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 __kernel_ulong_t 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 |