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.
23 #include <sys/types.h>
24 #include <sys/signal.h>
27 * Returned by aio_cancel:
29 #define AIO_CANCELED 0x1
30 #define AIO_NOTCANCELED 0x2
31 #define AIO_ALLDONE 0x3
43 #define LIO_NOWAIT 0x0
47 * Maximum number of allowed LIO operations
49 #define AIO_LISTIO_MAX 16
52 * Private members for aiocb -- don't access
55 struct __aiocb_private {
64 typedef struct aiocb {
65 int aio_fildes; /* File descriptor */
66 off_t aio_offset; /* File offset for I/O */
67 volatile void *aio_buf; /* I/O buffer in process space */
68 size_t aio_nbytes; /* Number of bytes for I/O */
69 char __spare__[sizeof(int) * 2 + sizeof(void *)]; /* osigevent. */
70 int aio_lio_opcode; /* LIO opcode */
71 int aio_reqprio; /* Request priority -- ignored */
72 struct __aiocb_private _aiocb_private;
73 struct sigevent aio_sigevent; /* Signal to deliver */
80 * Asynchronously read from a file
82 int aio_read(struct aiocb *);
85 * Asynchronously write to file
87 int aio_write(struct aiocb *);
90 * List I/O Asynchronously/synchronously read/write to/from file
91 * "lio_mode" specifies whether or not the I/O is synchronous.
92 * "acb_list" is an array of "nacb_listent" I/O control blocks.
93 * when all I/Os are complete, the optional signal "sig" is sent.
95 int lio_listio(int, struct aiocb * const [], int, struct sigevent *);
98 * Get completion status
99 * returns EINPROGRESS until I/O is complete.
100 * this routine does not block.
102 int aio_error(const struct aiocb *);
105 * Finish up I/O, releasing I/O resources and returns the value
106 * that would have been associated with a synchronous I/O request.
107 * This routine must be called once and only once for each
108 * I/O control block who has had I/O associated with it.
110 ssize_t aio_return(struct aiocb *);
115 int aio_cancel(int, struct aiocb *);
118 * Suspend until all specified I/O or timeout is complete.
120 int aio_suspend(const struct aiocb * const[], int, const struct timespec *);
122 int aio_waitcomplete(struct aiocb **, struct timespec *);
128 /* Forward declarations for prototypes below. */
132 extern void (*aio_swake)(struct socket *, struct sockbuf *);