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-.\" Copyright (c) 1998 Terry Lambert
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"	$Id$
-.\"
-.Dd November 17, 1998
-.Dt AIO_READ 2
-.Os
-.Sh NAME
-.Nm aio_read
-.Nd asynchronus read from a file (REALTIME)
-.Sh SYNOPSIS
-.Fd #include <aio.h>
-.Ft int
-.Fn aio_read "struct aiocb *iocb"
-.Sh DESCRIPTION
-The
-.Fn aio_read
-function allows the calling process to read
-.Ar iocb->aio_nbytes
-from the descriptor
-.Ar iocb->aio_fildes
-beginning at the offset
-.Ar iocb->aio_offset
-into the buffer pointed to by
-.Ar iocb->aio_buf .
-The call returns immediately after the read request has 
-been enqueued to the descriptor; the read may or may not have
-completed at the time the call returns.
-.Pp
-If _POSIX_PRIORITIZED_IO is defined, and the descriptor supports it,
-then the enqueued operation is submitted at a priority equal to that
-of the calling process minus
-.Ar iocb->aio_reqprio .
-.Pp
-The
-.Ar iocb->aio_lio_opcode
-is ignored by the
-.Fn aio_read
-call.
-.Pp
-The
-.Ar iocb
-pointer may be subsequently used as an argument to
-.Fn aio_return
-and
-.Fn aio_error
-in order to determine return or error status for the enqueued operation
-while it is in progress.
-.Pp
-If the request could not be enqueued (generally due to invalid arguments),
-then the call returns without having enqueued the request.
-.Pp
-If the request is successfully enqueued, the value of
-.Ar iocb->aio_offset
-can be modified during the request as context, so this value must
-not be referenced after the request is enqueued.
-.Sh RESTRICTIONS
-The Asynchronous I/O Control Block structure pointed to by
-.Ar iocb
-and the buffer that the
-.Ar iocb->aio_buf
-member of that structure references must remain valid until the
-operation has completed.  For this reason, use of auto (stack) variables
-for these objects is discouraged.
-.Pp
-Modifications of the Asynchronous I/O Control Block structure or the
-buffer contents after the request has been enqueued, but before the
-request has completed, are not allowed.
-.Pp
-If the file offset in
-.Ar iocb->aio_offset
-is past the offset maximum  for
-.Ar iocb->aio_fildes ,
-no I/O will occur.
-.Sh RETURN VALUES
-.Rv -std aio_read
-.Sh STANDARDS
-The
-.Fn aio_read
-call conforms to the
-.St -p1003.2
-standard.
-.Sh DIAGNOSTICS
-None.
-.Sh ERRORS
-The
-.Fn aio_read
-function will fail if:
-.Bl -tag -width Er
-.It Bq Er EAGAIN
-The request was not queued because of system resource limitations.
-.It Bq Er ENOSYS
-The
-.Fn aio_read
-call is not supported.
-.El
-.Pp
-The following conditions may be synchronously detected when the
-.Fn aio_read
-call is made, or asynchronously, at any time thereafter.  If they
-are detected at call time,
-.Fn aio_read
-returns -1 and sets
-.Ar errno
-appropriately; otherwise the
-.Fn aio_return
-function must be called, and will return -1, and
-Fn aio_error
-must be called to determine the actual calue that would have been
-returned in
-.Ar errno .
-.Pp
-.Bl -tag -width Er
-.It Bq Er EBADF
-.Ar iocb->aio_fildes
-is invalid.
-.It Bq Er EINVAL
-The offset
-.Ar iocb->aio_offset
-is not valid, the priority specified by
-.Ar iocb->aio_reqprio
-is not a valid priority, or the number of bytes specified by
-.Ar iocb->aio_nbytes
-is not valid.
-.It Bq Er EOVERFLOW
-The file is a regular file,
-.Ar iocb->aio_nbytes
-is greater than zero, the starting offset in
-.Ar iocb->aio_offset
-is before the end of the file, but is at or beyond the
-.Ar iocb->aio_fildes
-offset maximum.
-.El
-.Pp
-If the request is successfully enqueued, but subsequently cancelled
-or an error occurs, the value returned by the
-.Fn aio_return
-function is per the
-.Xr read 2
-call, and the value returned by the
-.Fn aio_error
-function is either one of the error returns from the
-.Xr read 2
-call, or one of:
-.Bl -tag -width Er
-.It Bq Er EBADF
-.Ar iocb->aio_fildes
-is invalid for reading.
-.It Bq Er ECANCELED
-The request was explicitly cancelled via a call to
-.Fn aio_cancel .
-.It Bq Er EINVAL
-The offset
-.Ar iocb->aio_offset
-would be invalid.
-.El
-.Sh HISTORY
-The
-.Nm
-Function first appeared in
-.Fx 3.0 .
-.Sh AUTHOR
-This
-manual page was written by
-.An Terry Lambert Aq terry@whistle.com .
-.Sh BUGS
-The value of iocb->aio_offset is ignored.