mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-22 11:17:19 +00:00
137 lines
3.7 KiB
Groff
137 lines
3.7 KiB
Groff
.\" Copyright (c) 1999 Christopher M Sedore.
|
|
.\" 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 ``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.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd January 19, 2000
|
|
.Dt AIO_WAITCOMPLETE 2
|
|
.Os
|
|
.Sh NAME
|
|
.Nm aio_waitcomplete
|
|
.Nd wait for the next completion of an aio request
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.Fd #include <aio.h>
|
|
.Ft int
|
|
.Fn aio_waitcomplete "struct aiocb **iocbp" "struct timespec *timeout"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn aio_waitcomplete
|
|
function waits for completion of an asynchronous I/O request.
|
|
Upon completion,
|
|
.Fn aio_waitcomplete
|
|
returns the result of the function and sets
|
|
.Fa iocbp
|
|
to point to the structure associated with the original request.
|
|
If an asynchronous I/O request is completed before
|
|
.Fn aio_waitcomplete
|
|
is called, it returns immediately with the completed request.
|
|
.Pp
|
|
If
|
|
.Fa timeout
|
|
is a non-NULL pointer, it specifies a maximum interval to wait for a
|
|
asynchronous I/O request to complete.
|
|
If
|
|
.Fa timeout
|
|
is a NULL pointer,
|
|
.Fn aio_waitcomplete
|
|
waits indefinitely.
|
|
To effect a poll, the
|
|
.Fa timeout
|
|
argument should be non-NULL, pointing to a zero-valued timeval structure.
|
|
.Pp
|
|
The
|
|
.Fn aio_waitcomplete
|
|
function also serves the function of
|
|
.Fn aio_return ,
|
|
thus
|
|
.Fn aio_return
|
|
should not be called for the control block returned in
|
|
.Fa iocbp .
|
|
.Sh RETURN VALUES
|
|
If an asynchronous I/O request has completed,
|
|
.Fa iocbp
|
|
is set to point to the control block passed with the original request,
|
|
and the status is returned as described in
|
|
.Xr read 2 ,
|
|
.Xr write 2 ,
|
|
or
|
|
.Xr fsync 2 .
|
|
On failure,
|
|
.Fn aio_waitcomplete
|
|
returns
|
|
.Dv -1 ,
|
|
sets iocbp to
|
|
.Dv NULL
|
|
and sets
|
|
.Va errno
|
|
to indicate the error condition.
|
|
.Sh ERRORS
|
|
The
|
|
.Fn aio_waitcomplete
|
|
function fails if:
|
|
.Bl -tag -width Er
|
|
.It Bq Er EINVAL
|
|
The specified time limit is invalid.
|
|
.It Bq Er EAGAIN
|
|
The process has not yet called
|
|
.Fn aio_read
|
|
or
|
|
.Fn aio_write .
|
|
.It Bq Er EINTR
|
|
A signal was delivered before the timeout expired and before any
|
|
asynchronous I/O requests completed.
|
|
.It Bq Er EWOULDBLOCK
|
|
.It Bq Er EINPROGRESS
|
|
The specified time limit expired before any asynchronous I/O requests
|
|
completed.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr aio_cancel 2 ,
|
|
.Xr aio_error 2 ,
|
|
.Xr aio_read 2 ,
|
|
.Xr aio_return 2 ,
|
|
.Xr aio_suspend 2 ,
|
|
.Xr aio_write 2 ,
|
|
.Xr fsync 2 ,
|
|
.Xr read 2 ,
|
|
.Xr write 2
|
|
.Sh STANDARDS
|
|
The
|
|
.Fn aio_waitcomplete
|
|
function is a
|
|
.Fx Ns -specific
|
|
extension.
|
|
.Sh HISTORY
|
|
The
|
|
.Fn aio_waitcomplete
|
|
function first appeared in
|
|
.Fx 4.0 .
|
|
.Sh AUTHORS
|
|
The
|
|
.Fn aio_waitcomplete
|
|
function and this manual page were written by
|
|
.An Christopher M Sedore Aq cmsedore@maxwell.syr.edu .
|