136 lines
3.7 KiB
Groff
136 lines
3.7 KiB
Groff
.\" Copyright (c) 1999 Christopher M Sedore.
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.\" 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. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd March 21, 2016
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.Dt AIO_WAITCOMPLETE 2
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.Os
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.Sh NAME
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.Nm aio_waitcomplete
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.Nd wait for the next completion of an aio request
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In aio.h
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.Ft ssize_t
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.Fn aio_waitcomplete "struct aiocb **iocbp" "struct timespec *timeout"
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.Sh DESCRIPTION
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The
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.Fn aio_waitcomplete
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system call waits for completion of an asynchronous I/O request.
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Upon completion,
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.Fn aio_waitcomplete
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returns the result of the function and sets
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.Fa iocbp
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to point to the structure associated with the original request.
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If an asynchronous I/O request is completed before
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.Fn aio_waitcomplete
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is called, it returns immediately with the completed request.
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.Pp
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If
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.Fa timeout
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is a non-NULL pointer, it specifies a maximum interval to wait for a
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asynchronous I/O request to complete.
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If
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.Fa timeout
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is a NULL pointer,
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.Fn aio_waitcomplete
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waits indefinitely.
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To effect a poll, the
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.Fa timeout
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argument should be non-NULL, pointing to a zero-valued timeval structure.
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.Pp
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The
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.Fn aio_waitcomplete
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system call also serves the function of
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.Fn aio_return ,
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thus
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.Fn aio_return
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should not be called for the control block returned in
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.Fa iocbp .
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.Sh RETURN VALUES
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If an asynchronous I/O request has completed,
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.Fa iocbp
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is set to point to the control block passed with the original request,
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and the status is returned as described in
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.Xr read 2 ,
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.Xr write 2 ,
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or
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.Xr fsync 2 .
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On failure,
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.Fn aio_waitcomplete
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returns
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.Dv -1 ,
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sets iocbp to
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.Dv NULL
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and sets
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.Va errno
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to indicate the error condition.
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.Sh ERRORS
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The
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.Fn aio_waitcomplete
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system call fails if:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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The specified time limit is invalid.
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.It Bq Er EAGAIN
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The process has not yet called
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.Fn aio_read
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or
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.Fn aio_write .
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.It Bq Er EINTR
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A signal was delivered before the timeout expired and before any
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asynchronous I/O requests completed.
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.It Bq Er EWOULDBLOCK
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.It Bq Er EINPROGRESS
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The specified time limit expired before any asynchronous I/O requests
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completed.
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.El
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.Sh SEE ALSO
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.Xr aio_cancel 2 ,
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.Xr aio_error 2 ,
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.Xr aio_read 2 ,
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.Xr aio_return 2 ,
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.Xr aio_suspend 2 ,
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.Xr aio_write 2 ,
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.Xr fsync 2 ,
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.Xr read 2 ,
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.Xr write 2 ,
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.Xr aio 4
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.Sh STANDARDS
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The
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.Fn aio_waitcomplete
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system call is a
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.Fx Ns -specific
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extension.
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.Sh HISTORY
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The
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.Fn aio_waitcomplete
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system call first appeared in
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.Fx 4.0 .
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.Sh AUTHORS
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The
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.Fn aio_waitcomplete
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system call and this manual page were written by
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.An Christopher M Sedore Aq Mt cmsedore@maxwell.syr.edu .
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