.\" .\" Copyright (c) 2008 Apple Inc. All rights reserved. .\" .\" @APPLE_LICENSE_HEADER_START@ .\" .\" This file contains Original Code and/or Modifications of Original Code .\" as defined in and that are subject to the Apple Public Source License .\" Version 2.0 (the 'License'). You may not use this file except in .\" compliance with the License. Please obtain a copy of the License at .\" http://www.opensource.apple.com/apsl/ and read it before using this .\" file. .\" .\" The Original Code and all software distributed under the License are .\" distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER .\" EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, .\" INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, .\" FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. .\" Please see the License for the specific language governing rights and .\" limitations under the License. .\" .\" @APPLE_LICENSE_HEADER_END@ .\" .\" .\" Copyright (c) 1999 Softweyr LLC. .\" 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 Softweyr LLC 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 Softweyr LLC 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: src/lib/libc/sys/aio_return.2,v 1.17 2003/01/13 10:37:11 tjr Exp $ .\" .Dd September 26, 2008 .Dt AIO_RETURN 2 .Os .Sh NAME .Nm aio_return .Nd retrieve return status of asynchronous I/O operation (REALTIME) .Sh LIBRARY .Lb libc .Sh SYNOPSIS .In aio.h .Ft ssize_t .Fo aio_return .Fa "struct aiocb *aiocbp" .Fc .Sh DESCRIPTION The .Fn aio_return system call returns the final status of the asynchronous I/O request associated with the structure pointed to by .Fa aiocbp . .Pp The .Fn aio_return system call should only be called once, to obtain the final status of an asynchronous I/O operation (once .Xr aio_error 2 returns something other than .Er EINPROGRESS) and to clean up system resources. However, if .Fn aio_return is not called at all, .Xr aio 4 will leak resources. .Sh RETURN VALUES If the asynchronous I/O request has completed, the status is returned as described in .Xr read 2 , .Xr write 2 , or .Xr fsync 2 . On failure, .Fn aio_return returns .Dv -1 and sets .Dv errno to indicate the error condition. .Sh ERRORS The .Fn aio_return system call will fail if: .Bl -tag -width Er .\" ========== .It Bq Er EINVAL The .Fa aiocbp argument does not reference an outstanding asynchronous I/O request. .\" ========== .It Bq Er EINPROGRESS The asynchronous I/O request is still in progress. .El .Sh LEGACY SYNOPSIS .Fd #include <aio.h> .Pp .Ft int .br .Fo aio_return .Fa "struct aiocb *aiocbp" .Fc ; .Pp The type of the return value has changed. .Sh SEE ALSO .Xr aio_cancel 2 , .Xr aio_error 2 , .Xr aio_suspend 2 , .Xr aio_write 2 , .Xr fsync 2 , .Xr read 2 , .Xr write 2 , .Xr aio 4 , .Xr compat 5 .Sh STANDARDS The .Fn aio_return system call is expected to conform to the .St -p1003.1 standard. .Sh HISTORY The .Fn aio_return system call first appeared in .Fx 3.0 . .Sh AUTHORS This manual page was written by .An Wes Peters Aq wes@softweyr.com .