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 32 typedef unsigned long aio_context_t; 33 34 enum { 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. */ 47 struct 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 68 struct 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