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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "AIO_RETURN" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" aio_return 
+.SH NAME
+aio_return \- retrieve return status of an asynchronous I/O operation
+(\fBREALTIME\fP)
+.SH SYNOPSIS
+.LP
+\fB#include <aio.h>
+.br
+.sp
+ssize_t aio_return(struct aiocb *\fP\fIaiocbp\fP\fB); \fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIaio_return\fP() function shall return the return status associated
+with the \fBaiocb\fP structure referenced by the
+\fIaiocbp\fP argument. The return status for an asynchronous I/O operation
+is the value that would be returned by the
+corresponding \fIread\fP(), \fIwrite\fP(), or \fIfsync\fP() function
+call. If the error status for the operation is equal to [EINPROGRESS],
+then
+the return status for the operation is undefined. The \fIaio_return\fP()
+function may be called exactly once to retrieve the
+return status of a given asynchronous operation; thereafter, if the
+same \fBaiocb\fP structure is used in a call to
+\fIaio_return\fP() or \fIaio_error\fP(), an error may be returned.
+When the
+\fBaiocb\fP structure referred to by \fIaiocbp\fP is used to submit
+another asynchronous operation, then \fIaio_return\fP() may
+be successfully used to retrieve the return status of that operation.
+.SH RETURN VALUE
+.LP
+If the asynchronous I/O operation has completed, then the return status,
+as described for \fIread\fP(), \fIwrite\fP(), and \fIfsync\fP(), shall
+be returned. If the asynchronous I/O operation has not yet completed,
+the
+results of \fIaio_return\fP() are undefined.
+.SH ERRORS
+.LP
+The \fIaio_return\fP() function may fail if:
+.TP 7
+.B EINVAL
+The \fIaiocbp\fP argument does not refer to an asynchronous operation
+whose return status has not yet been retrieved.
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+The \fIaio_return\fP() function is part of the Asynchronous Input
+and Output option and need not be available on all
+implementations.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIaio_cancel\fP() , \fIaio_error\fP() , \fIaio_fsync\fP() , \fIaio_read\fP()
+, \fIaio_write\fP() , \fIclose\fP() , \fIexec\fP() , \fIexit\fP()
+, \fIfork\fP() , \fIlio_listio\fP() , \fIlseek\fP() , \fIread\fP()
+,
+the Base Definitions volume of IEEE\ Std\ 1003.1-2001, \fI<aio.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .