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 $
17 * $DragonFly: src/sys/sys/aio.h,v 1.2 2003/06/17 04:28:58 dillon Exp $
24 #include <sys/types.h>
25 #include <sys/signal.h>
28 * Returned by aio_cancel:
30 #define AIO_CANCELED 0x1
31 #define AIO_NOTCANCELED 0x2
32 #define AIO_ALLDONE 0x3
44 #define LIO_NOWAIT 0x0
48 * Maximum number of allowed LIO operations
50 #define AIO_LISTIO_MAX 16
53 * Private members for aiocb -- don't access
56 struct __aiocb_private {
65 typedef struct aiocb {
66 int aio_fildes; /* File descriptor */
67 off_t aio_offset; /* File offset for I/O */
68 volatile void *aio_buf; /* I/O buffer in process space */
69 size_t aio_nbytes; /* Number of bytes for I/O */
70 struct sigevent aio_sigevent; /* Signal to deliver */
71 int aio_lio_opcode; /* LIO opcode */
72 int aio_reqprio; /* Request priority -- ignored */
73 struct __aiocb_private _aiocb_private;
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 *);
131 #define AIOCBLIST_RUNDOWN 0x4
132 #define AIOCBLIST_DONE 0x10
135 TAILQ_ENTRY (aiocblist) list; /* List of jobs */
136 TAILQ_ENTRY (aiocblist) plist; /* List of jobs for proc */
139 int inputcharge, outputcharge;
140 struct callout_handle timeouthandle;
141 struct buf *bp; /* Buffer pointer */
142 struct proc *userproc; /* User process */
143 struct file *fd_file; /* Pointer to file structure */
144 struct aio_liojob *lio; /* Optional lio job */
145 struct aiocb *uuaiocb; /* Pointer in userspace of aiocb */
146 struct klist klist; /* list of knotes */
147 struct aiocb uaiocb; /* Kernel I/O control block */
150 /* Forward declarations for prototypes below. */
154 void aio_proc_rundown(struct proc *p);
155 void aio_swake(struct socket *, struct sockbuf *);