/*
 * Copyright (c) 1997 John S. Dyson.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. John S. Dyson's name may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * DISCLAIMER:  This code isn't warranted to do anything useful.  Anything
 * bad that happens because of using this software isn't the responsibility
 * of the author.  This software is distributed AS-IS.
 *
 * $FreeBSD: src/sys/sys/aio.h,v 1.13.2.8 2002/08/31 03:18:23 alc Exp $
 */

#ifndef _AIO_COMPAT_H_
#define	_AIO_COMPAT_H_

#include <sys/signal.h>
#include <sys/stdint.h>

#include <pthread.h>

#ifndef _OFF_T_DECLARED
typedef	__off_t		off_t;
#define	_OFF_T_DECLARED
#endif

#ifndef _SIZE_T_DECLARED
#define	_SIZE_T_DECLARED
typedef	__size_t	size_t;
#endif

#ifndef _SSIZE_T_DECLARED
#define	_SSIZE_T_DECLARED
typedef	__ssize_t	ssize_t;
#endif

#ifndef __restrict_arr
#define __restrict_arr	__restrict
#endif

/*
 * Returned by aio_cancel:
 */
#define	AIO_CANCELED		0x1
#define	AIO_NOTCANCELED		0x2
#define	AIO_ALLDONE		0x3

/*
 * LIO opcodes
 */
#define	LIO_NOP			0x0
#define	LIO_WRITE		0x1
#define	LIO_READ		0x2

/*
 * LIO modes
 */
#define	LIO_NOWAIT		0x0
#define	LIO_WAIT		0x1

/*
 * Maximum number of allowed LIO operations
 */
#define	AIO_LISTIO_MAX		16

/*
 * OpenBSD does not have this in sys/signal.h
 * Taken from DragonFly BSD
 */
#ifdef __OpenBSD__
struct sigevent {
	int	sigev_notify;		/* Notification type */
	union {
		int	__sigev_signo;	/* Signal number */
		int	__sigev_notify_kqueue;
		pthread_attr_t *__sigev_notify_attributes;
	} __sigev_u;
	union sigval sigev_value;	/* Signal value */
	void (*sigev_notify_function)(union sigval);
};
#define sigev_signo		__sigev_u.__sigev_signo
#define sigev_notify_attributes	__sigev_u.__sigev_notify_attributes
#define sigev_notify_kqueue	__sigev_u.__sigev_notify_kqueue

#define	SIGEV_NONE	0		/* No async notification */
#define	SIGEV_SIGNAL	1		/* Generate a queued signal */
#define SIGEV_THREAD	2		/* Call back in a pthread */
#define SIGEV_KEVENT	3		/* Generate a kevent */
#endif

/*
 * I/O control block
 */
typedef struct aiocb {
	int	aio_fildes;		/* File descriptor */
	off_t	aio_offset;		/* File offset for I/O */
	volatile void *aio_buf;         /* I/O buffer in process space */
	size_t	aio_nbytes;		/* Number of bytes for I/O */
	struct	sigevent aio_sigevent;	/* Signal to deliver */
	int	aio_lio_opcode;		/* LIO opcode */
	int	aio_reqprio;		/* Request priority -- ignored */

	int     _aio_val;
	int     _aio_err;
} aiocb_t;

#ifndef _KERNEL

__BEGIN_DECLS
/*
 * Asynchronously read from a file
 */
int	aio_read(struct aiocb *);

/*
 * Asynchronously write to file
 */
int	aio_write(struct aiocb *);

/*
 * List I/O Asynchronously/synchronously read/write to/from file
 *	"lio_mode" specifies whether or not the I/O is synchronous.
 *	"acb_list" is an array of "nacb_listent" I/O control blocks.
 *	when all I/Os are complete, the optional signal "sig" is sent.
 */
int	lio_listio(int, struct aiocb * __restrict const[__restrict_arr], int,
	    struct sigevent * __restrict);

/*
 * Get completion status
 *	returns EINPROGRESS until I/O is complete.
 *	this routine does not block.
 */
int	aio_error(const struct aiocb *);

/*
 * Finish up I/O, releasing I/O resources and returns the value
 *	that would have been associated with a synchronous I/O request.
 *	This routine must be called once and only once for each
 *	I/O control block who has had I/O associated with it.
 */
ssize_t	aio_return(struct aiocb *);

/*
 * Cancel I/O
 */
int	aio_cancel(int, struct aiocb *);

/*
 * Suspend until all specified I/O or timeout is complete.
 */
int	aio_suspend(const struct aiocb * const[], int, const struct timespec *);

/*
 * Synchronize I/O
 */
int	aio_fsync(int, struct aiocb *);

int	aio_waitcomplete(struct aiocb **, struct timespec *);

__END_DECLS

#endif

#endif
