175 lines
4.4 KiB
C
175 lines
4.4 KiB
C
/*
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* Copyright (c) 1997 John S. Dyson. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. John S. Dyson's name may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* DISCLAIMER: This code isn't warranted to do anything useful. Anything
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* bad that happens because of using this software isn't the responsibility
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* of the author. This software is distributed AS-IS.
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*
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* $FreeBSD$
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*/
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#ifndef _SYS_AIO_H_
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#define _SYS_AIO_H_
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/signal.h>
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/*
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* Returned by aio_cancel:
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* (Note that FreeBSD's aio is not cancellable -- yet.)
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*/
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#define AIO_CANCELED 0x1
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#define AIO_NOTCANCELED 0x2
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#define AIO_ALLDONE 0x3
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/*
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* LIO opcodes
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*/
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#define LIO_NOP 0x0
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#define LIO_WRITE 0x1
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#define LIO_READ 0x2
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/*
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* LIO modes
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*/
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#define LIO_NOWAIT 0x0
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#define LIO_WAIT 0x1
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/*
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* Maximum number of allowed LIO operations
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*/
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#define AIO_LISTIO_MAX 16
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/*
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* Private mode bit for aio.
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* (This bit is set by the library routine
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* to allow the kernel to support sync
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* or async operations in the future.)
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*/
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#define AIO_PMODE_SYNC 0x1
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#define AIO_PMODE_DONE 0x2
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#define AIO_PMODE_SUSPEND 0x4
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#define AIO_PMODE_ACTIVE 0x2357c0de
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/*
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* Private members for aiocb -- don't access
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* directly.
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*/
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struct __aiocb_private {
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long status;
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long error;
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long privatemodes;
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void *kernelinfo;
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};
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/*
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* I/O control block
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*/
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typedef struct aiocb {
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int aio_fildes; /* File descriptor */
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off_t aio_offset; /* File offset for I/O */
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volatile void *aio_buf; /* I/O buffer in process space */
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size_t aio_nbytes; /* Number of bytes for I/O */
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struct sigevent aio_sigevent; /* Signal to deliver */
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int aio_lio_opcode; /* LIO opcode */
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int aio_reqprio; /* Request priority -- ignored */
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struct __aiocb_private _aiocb_private;
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} aiocb_t;
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#ifndef _KERNEL
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__BEGIN_DECLS
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/*
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* Asynchronously read from a file
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*/
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int aio_read(struct aiocb *);
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/*
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* Asynchronously write to file
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*/
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int aio_write(struct aiocb *);
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/*
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* List I/O Asynchronously/synchronously read/write to/from file
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* "lio_mode" specifies whether or not the I/O is synchronous.
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* "acb_list" is an array of "nacb_listent" I/O control blocks.
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* when all I/Os are complete, the optional signal "sig" is sent.
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*/
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int lio_listio(int, struct aiocb * const [], int, struct sigevent *);
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/*
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* Get completion status
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* returns EINPROGRESS until I/O is complete.
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* this routine does not block.
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*/
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int aio_error(const struct aiocb *);
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/*
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* Finish up I/O, releasing I/O resources and returns the value
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* that would have been associated with a synchronous I/O request.
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* This routine must be called once and only once for each
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* I/O control block who has had I/O associated with it.
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*/
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ssize_t aio_return(struct aiocb *);
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/*
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* Cancel I/O -- implemented only to return AIO_NOTCANCELLED or
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* AIO_ALLDONE. No cancellation operation will occur.
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*/
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int aio_cancel(int, struct aiocb *);
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/*
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* Suspend until all specified I/O or timeout is complete.
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*/
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int aio_suspend(const struct aiocb * const[], int, const struct timespec *);
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int aio_waitcomplete(struct aiocb **, struct timespec *);
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__END_DECLS
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#else
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/*
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* Job queue item
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*/
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#define AIOCBLIST_CANCELLED 0x1
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#define AIOCBLIST_RUNDOWN 0x4
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#define AIOCBLIST_ASYNCFREE 0x8
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#define AIOCBLIST_DONE 0x10
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struct aiocblist {
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TAILQ_ENTRY (aiocblist) list; /* List of jobs */
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TAILQ_ENTRY (aiocblist) plist; /* List of jobs for proc */
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int jobflags;
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int jobstate;
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int inputcharge, outputcharge;
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struct buf *bp; /* Buffer pointer */
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struct proc *userproc; /* User process */
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struct file *fd_file; /* Pointer to file structure */
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struct aioproclist *jobaioproc;/* AIO process descriptor */
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struct aio_liojob *lio; /* Optional lio job */
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struct aiocb *uuaiocb; /* Pointer in userspace of aiocb */
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struct klist klist; /* list of knotes */
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struct aiocb uaiocb; /* Kernel I/O control block */
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};
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/* Forward declarations for prototypes below. */
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struct socket;
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struct sockbuf;
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void aio_proc_rundown(struct proc *p);
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void aio_swake(struct socket *, struct sockbuf *);
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#endif
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#endif
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