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>
25 #include <sys/socketvar.h>
28 * Returned by aio_cancel:
29 * (Note that FreeBSD's aio is not cancellable -- yet.)
31 #define AIO_CANCELED 0x1
32 #define AIO_NOTCANCELED 0x2
33 #define AIO_ALLDONE 0x3
45 #define LIO_NOWAIT 0x0
49 * Maximum number of allowed LIO operations
51 #define AIO_LISTIO_MAX 16
54 * Private mode bit for aio.
55 * (This bit is set by the library routine
56 * to allow the kernel to support sync
57 * or async operations in the future.)
59 #define AIO_PMODE_SYNC 0x1
60 #define AIO_PMODE_DONE 0x2
61 #define AIO_PMODE_SUSPEND 0x4
62 #define AIO_PMODE_ACTIVE 0x2357c0de
65 * Private members for aiocb -- don't access
68 struct __aiocb_private {
82 typedef struct aiocb {
83 int aio_fildes; /* File descriptor */
84 off_t aio_offset; /* File offset for I/O */
85 volatile void *aio_buf; /* I/O buffer in process space */
86 size_t aio_nbytes; /* Number of bytes for I/O */
87 struct sigevent aio_sigevent; /* Signal to deliver */
88 int aio_lio_opcode; /* LIO opcode */
89 int aio_reqprio; /* Request priority -- ignored */
90 struct __aiocb_private _aiocb_private;
97 * Asynchronously read from a file
99 int aio_read(struct aiocb *);
102 * Asynchronously write to file
104 int aio_write(struct aiocb *);
107 * List I/O Asynchronously/synchronously read/write to/from file
108 * "lio_mode" specifies whether or not the I/O is synchronous.
109 * "acb_list" is an array of "nacb_listent" I/O control blocks.
110 * when all I/Os are complete, the optional signal "sig" is sent.
112 int lio_listio(int, struct aiocb * const [], int, struct sigevent *);
115 * Get completion status
116 * returns EINPROGRESS until I/O is complete.
117 * this routine does not block.
119 int aio_error(const struct aiocb *);
122 * Finish up I/O, releasing I/O resources and returns the value
123 * that would have been associated with a synchronous I/O request.
124 * This routine must be called once and only once for each
125 * I/O control block who has had I/O associated with it.
127 ssize_t aio_return(struct aiocb *);
130 * Cancel I/O -- implemented only to return AIO_NOTCANCELLED or
131 * AIO_ALLDONE. No cancellation operation will occur.
133 int aio_cancel(int, struct aiocb *);
136 * Suspend until all specified I/O or timeout is complete.
138 int aio_suspend(const struct aiocb * const[], int, const struct timespec *);
141 * Retrieve the status of the specified I/O request.
143 int aio_error(const struct aiocb *);
145 int aio_waitcomplete(struct aiocb **, struct timespec *);
154 #define AIOCBLIST_CANCELLED 0x1
155 #define AIOCBLIST_RUNDOWN 0x4
156 #define AIOCBLIST_ASYNCFREE 0x8
157 #define AIOCBLIST_DONE 0x10
160 TAILQ_ENTRY (aiocblist) list; /* List of jobs */
161 TAILQ_ENTRY (aiocblist) plist; /* List of jobs for proc */
164 int inputcharge, outputcharge;
165 struct buf *bp; /* Buffer pointer */
166 struct proc *userproc; /* User process */
167 struct file *fd_file; /* Pointer to file structure */
168 struct aioproclist *jobaioproc;/* AIO process descriptor */
169 struct aio_liojob *lio; /* Optional lio job */
170 struct aiocb *uuaiocb; /* Pointer in userspace of aiocb */
171 struct aiocb uaiocb; /* Kernel I/O control block */
174 void aio_proc_rundown(struct proc *p);
176 void aio_swake(struct socket *, struct sockbuf *);