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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/include/linux/aio_abi.h
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/* include/linux/aio_abi.h

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 *

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 * Copyright 2000,2001,2002 Red Hat.

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 *

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 * Written by Benjamin LaHaise <[email protected]>

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 *

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 * Distribute under the terms of the GPLv2 (see ../../COPYING) or under 

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 * the following terms.

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 *

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 * Permission to use, copy, modify, and distribute this software and its

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 * documentation is hereby granted, provided that the above copyright

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 * notice appears in all copies.  This software is provided without any

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 * warranty, express or implied.  Red Hat makes no representations about

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 * the suitability of this software for any purpose.

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 *

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 * IN NO EVENT SHALL RED HAT BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,

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 * SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF

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 * THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF RED HAT HAS BEEN ADVISED

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 * OF THE POSSIBILITY OF SUCH DAMAGE.

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 *

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 * RED HAT DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

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 * PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND

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 * RED HAT HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,

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 * ENHANCEMENTS, OR MODIFICATIONS.

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 */

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#ifndef __LINUX__AIO_ABI_H

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#define __LINUX__AIO_ABI_H

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#include <linux/types.h>

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#include <asm/byteorder.h>

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typedef unsigned long	aio_context_t;

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enum {

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	IOCB_CMD_PREAD = 0,

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	IOCB_CMD_PWRITE = 1,

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	IOCB_CMD_FSYNC = 2,

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	IOCB_CMD_FDSYNC = 3,

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	/* These two are experimental.

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	 * IOCB_CMD_PREADX = 4,

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	 * IOCB_CMD_POLL = 5,

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	 */

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	IOCB_CMD_NOOP = 6,

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	IOCB_CMD_PREADV = 7,

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	IOCB_CMD_PWRITEV = 8,

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};

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/*

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 * Valid flags for the "aio_flags" member of the "struct iocb".

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 *

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 * IOCB_FLAG_RESFD - Set if the "aio_resfd" member of the "struct iocb"

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 *                   is valid.

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 */

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#define IOCB_FLAG_RESFD		(1 << 0)

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/* read() from /dev/aio returns these structures. */

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struct io_event {

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	__u64		data;		/* the data field from the iocb */

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	__u64		obj;		/* what iocb this event came from */

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	__s64		res;		/* result code for this event */

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	__s64		res2;		/* secondary result */

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};

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#if defined(__LITTLE_ENDIAN)

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#define PADDED(x,y)	x, y

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#elif defined(__BIG_ENDIAN)

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#define PADDED(x,y)	y, x

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#else

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#error edit for your odd byteorder.

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#endif

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/*

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 * we always use a 64bit off_t when communicating

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 * with userland.  its up to libraries to do the

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 * proper padding and aio_error abstraction

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 */

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struct iocb {

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	/* these are internal to the kernel/libc. */

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	__u64	aio_data;	/* data to be returned in event's data */

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	__u32	PADDED(aio_key, aio_reserved1);

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				/* the kernel sets aio_key to the req # */

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	/* common fields */

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	__u16	aio_lio_opcode;	/* see IOCB_CMD_ above */

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	__s16	aio_reqprio;

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	__u32	aio_fildes;

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	__u64	aio_buf;

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	__u64	aio_nbytes;

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	__s64	aio_offset;

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	/* extra parameters */

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	__u64	aio_reserved2;	/* TODO: use this for a (struct sigevent *) */

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	/* flags for the "struct iocb" */

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	__u32	aio_flags;

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	/*

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	 * if the IOCB_FLAG_RESFD flag of "aio_flags" is set, this is an

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	 * eventfd to signal AIO readiness to

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	 */

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	__u32	aio_resfd;

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}; /* 64 bytes */

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#undef IFBIG

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#undef IFLITTLE

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#endif /* __LINUX__AIO_ABI_H */

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