/* 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,	/* 4 was the experimental IOCB_CMD_PREADX */	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 */