5 * Copyright (c) 1997 John S. Dyson. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. John S. Dyson's name may not be used to endorse or promote products
13 * derived from this software without specific prior written permission.
15 * DISCLAIMER: This code isn't warranted to do anything useful. Anything
16 * bad that happens because of using this software isn't the responsibility
17 * of the author. This software is distributed AS-IS.
19 * $Id: aio.h,v 1.7 1998/03/28 11:50:34 dufault Exp $
22 #include <sys/types.h>
23 #include <sys/signal.h>
25 * Returned by aio_cancel:
26 * (Note that FreeBSD's aio is not cancellable -- yet.)
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
51 * Private mode bit for aio.
52 * (This bit is set by the library routine
53 * to allow the kernel to support sync
54 * or async operations in the future.)
56 #define AIO_PMODE_SYNC 0x1
57 #define AIO_PMODE_DONE 0x2
58 #define AIO_PMODE_SUSPEND 0x4
59 #define AIO_PMODE_ACTIVE 0x2357c0de
62 * Private members for aiocb -- don't access
65 struct __aiocb_private {
79 typedef struct aiocb {
80 int aio_fildes; /* File descriptor */
81 off_t aio_offset; /* File offset for I/O */
82 volatile void *aio_buf; /* I/O buffer in process space */
83 size_t aio_nbytes; /* Number of bytes for I/O */
84 struct sigevent aio_sigevent; /* Signal to deliver */
85 int aio_lio_opcode; /* LIO opcode */
86 int aio_reqprio; /* Request priority -- ignored */
87 struct __aiocb_private _aiocb_private;
92 * Asynchronously read from a file
94 int aio_read( struct aiocb *iocb);
97 * Asynchronously write to file
99 int aio_write( struct aiocb *iocb);
102 * List I/O Asynchronously/synchronously read/write to/from file
103 * "lio_mode" specifies whether or not the I/O is synchronous.
104 * "acb_list" is an array of "nacb_listent" I/O control blocks.
105 * when all I/Os are complete, the optional signal "sig" is sent.
107 int lio_listio( int lio_mode, struct aiocb * const acb_list[],
108 int nacb_listent, struct sigevent *sig);
111 * Get completion status
112 * returns EINPROGRESS until I/O is complete.
113 * this routine does not block.
115 int aio_error( const struct aiocb *iocb);
118 * Finish up I/O, releasing I/O resources and returns the value
119 * that would have been associated with a synchronous I/O request.
120 * This routine must be called once and only once for each
121 * I/O control block who has had I/O associated with it.
123 ssize_t aio_return( struct aiocb *iocb);
126 * Cancel I/O -- implemented only to return AIO_NOTCANCELLED or
127 * AIO_ALLDONE. No cancellation operation will occur.
129 int aio_cancel( int fd, struct aiocb *iocb);
132 * Suspend until all specified I/O or timeout is complete.
134 int aio_suspend( const struct aiocb * const acb_list[], int nacb_listent,
135 const struct timespec *tm);
138 * Retrieve the status of the specified I/O request.
140 int aio_error( const struct aiocb *aiocbp);
144 void aio_proc_rundown( struct proc *p);