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/* include/linux/aio_abi.h * * Copyright 2000,2001,2002 Red Hat. * * Written by Benjamin LaHaise <bcrl@kvack.org> * * Distribute under the terms of the GPLv2 (see ../../COPYING) or under * the following terms. * * Permission to use, copy, modify, and distribute this software and its * documentation is hereby granted, provided that the above copyright * notice appears in all copies. This software is provided without any * warranty, express or implied. Red Hat makes no representations about * the suitability of this software for any purpose. * * IN NO EVENT SHALL RED HAT BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, * SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF * THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF RED HAT HAS BEEN ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * * RED HAT DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND * RED HAT HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, * ENHANCEMENTS, OR MODIFICATIONS. */ #ifndef __LINUX__AIO_ABI_H #define __LINUX__AIO_ABI_H #include <linux/types.h> #include <linux/fs.h> #include <asm/byteorder.h> typedef __kernel_ulong_t aio_context_t; enum { IOCB_CMD_PREAD = 0, IOCB_CMD_PWRITE = 1, IOCB_CMD_FSYNC = 2, IOCB_CMD_FDSYNC = 3, /* These two are experimental. * IOCB_CMD_PREADX = 4, * IOCB_CMD_POLL = 5, */ IOCB_CMD_NOOP = 6, IOCB_CMD_PREADV = 7, IOCB_CMD_PWRITEV = 8, }; /* * Valid flags for the "aio_flags" member of the "struct iocb". * * IOCB_FLAG_RESFD - Set if the "aio_resfd" member of the "struct iocb" * is valid. * IOCB_FLAG_IOPRIO - Set if the "aio_reqprio" member of the "struct iocb" * is valid. */ #define IOCB_FLAG_RESFD (1 << 0) #define IOCB_FLAG_IOPRIO (1 << 1) /* read() from /dev/aio returns these structures. */ struct io_event { __u64 data; /* the data field from the iocb */ __u64 obj; /* what iocb this event came from */ __s64 res; /* result code for this event */ __s64 res2; /* secondary result */ }; /* * we always use a 64bit off_t when communicating * with userland. its up to libraries to do the * proper padding and aio_error abstraction */ struct iocb { /* these are internal to the kernel/libc. */ __u64 aio_data; /* data to be returned in event's data */ #if defined(__BYTE_ORDER) ? __BYTE_ORDER == __LITTLE_ENDIAN : defined(__LITTLE_ENDIAN) __u32 aio_key; /* the kernel sets aio_key to the req # */ __kernel_rwf_t aio_rw_flags; /* RWF_* flags */ #elif defined(__BYTE_ORDER) ? __BYTE_ORDER == __BIG_ENDIAN : defined(__BIG_ENDIAN) __kernel_rwf_t aio_rw_flags; /* RWF_* flags */ __u32 aio_key; /* the kernel sets aio_key to the req # */ #else #error edit for your odd byteorder. #endif /* common fields */ __u16 aio_lio_opcode; /* see IOCB_CMD_ above */ __s16 aio_reqprio; __u32 aio_fildes; __u64 aio_buf; __u64 aio_nbytes; __s64 aio_offset; /* extra parameters */ __u64 aio_reserved2; /* TODO: use this for a (struct sigevent *) */ /* flags for the "struct iocb" */ __u32 aio_flags; /* * if the IOCB_FLAG_RESFD flag of "aio_flags" is set, this is an * eventfd to signal AIO readiness to */ __u32 aio_resfd; }; /* 64 bytes */ #undef IFBIG #undef IFLITTLE #endif /* __LINUX__AIO_ABI_H */
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