| 1 | /* linux/aio_abi.h |
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| 2 | * |
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| 3 | * Copyright 2000,2001,2002 Red Hat. |
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| 4 | * |
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| 5 | * Written by Benjamin LaHaise <bcrl@kvack.org> |
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| 6 | * |
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| 7 | * Distribute under the terms of the GPLv2 (see ../../COPYING) or under |
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| 8 | * the following terms. |
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| 9 | * |
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| 10 | * Permission to use, copy, modify, and distribute this software and its |
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| 11 | * documentation is hereby granted, provided that the above copyright |
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| 12 | * notice appears in all copies. This software is provided without any |
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| 13 | * warranty, express or implied. Red Hat makes no representations about |
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| 14 | * the suitability of this software for any purpose. |
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| 15 | * |
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| 16 | * IN NO EVENT SHALL RED HAT BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, |
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| 17 | * SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF |
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| 18 | * THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF RED HAT HAS BEEN ADVISED |
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| 19 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 20 | * |
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| 21 | * RED HAT DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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| 23 | * PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND |
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| 24 | * RED HAT HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, |
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| 25 | * ENHANCEMENTS, OR MODIFICATIONS. |
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| 26 | */ |
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| 27 | #ifndef __LINUX__AIO_ABI_H |
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| 28 | #define __LINUX__AIO_ABI_H |
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| 29 | |
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| 30 | #include <endian.h> |
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| 31 | #include <byteswap.h> |
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| 32 | #include <asm/types.h> |
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| 33 | |
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| 34 | typedef unsigned long aio_context_t; |
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| 35 | |
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| 36 | enum { |
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| 37 | IOCB_CMD_PREAD = 0, |
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| 38 | IOCB_CMD_PWRITE = 1, |
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| 39 | IOCB_CMD_FSYNC = 2, |
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| 40 | IOCB_CMD_FDSYNC = 3, |
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| 41 | /* These two are experimental. |
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| 42 | * IOCB_CMD_PREADX = 4, |
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| 43 | * IOCB_CMD_POLL = 5, |
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| 44 | */ |
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| 45 | IOCB_CMD_NOOP = 6, |
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| 46 | }; |
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| 47 | |
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| 48 | /* read() from /dev/aio returns these structures. */ |
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| 49 | struct io_event { |
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| 50 | __u64 data; /* the data field from the iocb */ |
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| 51 | __u64 obj; /* what iocb this event came from */ |
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| 52 | __s64 res; /* result code for this event */ |
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| 53 | __s64 res2; /* secondary result */ |
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| 54 | }; |
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| 55 | |
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| 56 | #if defined(__LITTLE_ENDIAN) |
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| 57 | #define PADDED(x,y) x, y |
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| 58 | #elif defined(__BIG_ENDIAN) |
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| 59 | #define PADDED(x,y) y, x |
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| 60 | #else |
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| 61 | #error edit for your odd byteorder. |
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| 62 | #endif |
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| 63 | |
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| 64 | /* |
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| 65 | * we always use a 64bit off_t when communicating |
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| 66 | * with userland. its up to libraries to do the |
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| 67 | * proper padding and aio_error abstraction |
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| 68 | */ |
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| 69 | |
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| 70 | struct iocb { |
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| 71 | /* these are internal to the kernel/libc. */ |
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| 72 | __u64 aio_data; /* data to be returned in event's data */ |
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| 73 | __u32 PADDED(aio_key, aio_reserved1); |
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| 74 | /* the kernel sets aio_key to the req # */ |
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| 75 | |
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| 76 | /* common fields */ |
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| 77 | __u16 aio_lio_opcode; /* see IOCB_CMD_ above */ |
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| 78 | __s16 aio_reqprio; |
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| 79 | __u32 aio_fildes; |
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| 80 | |
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| 81 | __u64 aio_buf; |
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| 82 | __u64 aio_nbytes; |
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| 83 | __s64 aio_offset; |
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| 84 | |
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| 85 | /* extra parameters */ |
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| 86 | __u64 aio_reserved2; /* TODO: use this for a (struct sigevent *) */ |
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| 87 | __u64 aio_reserved3; |
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| 88 | }; /* 64 bytes */ |
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| 89 | |
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| 90 | #undef IFBIG |
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| 91 | #undef IFLITTLE |
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| 92 | |
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| 93 | #endif /* __LINUX__AIO_ABI_H */ |
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| 94 | |
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