2 * Copyright (c) 1997 John S. Dyson. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. John S. Dyson's name may not be used to endorse or promote products
10 * derived from this software without specific prior written permission.
12 * DISCLAIMER: This code isn't warranted to do anything useful. Anything
13 * bad that happens because of using this software isn't the responsibility
14 * of the author. This software is distributed AS-IS.
16 * $FreeBSD: src/sys/sys/aio.h,v 1.13.2.8 2002/08/31 03:18:23 alc Exp $
22 #include <sys/_timespec.h>
23 #include <sys/signal.h>
26 * Returned by aio_cancel:
28 #define AIO_CANCELED 0x1
29 #define AIO_NOTCANCELED 0x2
30 #define AIO_ALLDONE 0x3
42 #define LIO_NOWAIT 0x0
46 * Maximum number of allowed LIO operations
48 #define AIO_LISTIO_MAX 16
53 typedef struct aiocb {
54 int aio_fildes; /* File descriptor */
55 off_t aio_offset; /* File offset for I/O */
56 volatile void *aio_buf; /* I/O buffer in process space */
57 size_t aio_nbytes; /* Number of bytes for I/O */
58 struct sigevent aio_sigevent; /* Signal to deliver */
59 int aio_lio_opcode; /* LIO opcode */
60 int aio_reqprio; /* Request priority -- ignored */
70 * Asynchronously read from a file
72 int aio_read(struct aiocb *);
75 * Asynchronously write to file
77 int aio_write(struct aiocb *);
80 * List I/O Asynchronously/synchronously read/write to/from file
81 * "lio_mode" specifies whether or not the I/O is synchronous.
82 * "acb_list" is an array of "nacb_listent" I/O control blocks.
83 * when all I/Os are complete, the optional signal "sig" is sent.
85 int lio_listio(int, struct aiocb * const [], int, struct sigevent *);
88 * Get completion status
89 * returns EINPROGRESS until I/O is complete.
90 * this routine does not block.
92 int aio_error(const struct aiocb *);
95 * Finish up I/O, releasing I/O resources and returns the value
96 * that would have been associated with a synchronous I/O request.
97 * This routine must be called once and only once for each
98 * I/O control block who has had I/O associated with it.
100 ssize_t aio_return(struct aiocb *);
105 int aio_cancel(int, struct aiocb *);
108 * Suspend until all specified I/O or timeout is complete.
110 int aio_suspend(const struct aiocb * const[], int, const struct timespec *);
115 int aio_fsync(int, struct aiocb *);
117 int aio_waitcomplete(struct aiocb **, struct timespec *);