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.\" $FreeBSD: src/lib/libc/sys/aio_error.2,v 1.18 2003/01/13 10:37:11 tjr Exp $
.\"
.Dd June 2, 1999
.Dt AIO_ERROR 2
.Os
.Sh NAME
.Nm aio_error
.Nd retrieve error status of asynchronous I/O operation (REALTIME)
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In aio.h
.Ft int
.Fo aio_error
.Fa "const struct aiocb *aiocbp"
.Fc
.Sh DESCRIPTION
The
.Fn aio_error
system call returns the error status of the asynchronous I/O request
associated with the structure pointed to by
.Fa aiocbp .
.Sh RETURN VALUES
If the asynchronous I/O request has completed successfully,
.Fn aio_error
returns 0.  If the request has not yet completed,
.Er EINPROGRESS
is returned.
If the request has completed unsuccessfully,
the error status is returned as described in
.Xr read 2 ,
.Xr write 2 ,
or
.Xr fsync 2
is returned.
On failure,
.Fn aio_error
returns
.Dv -1
and sets
.Dv errno
to indicate the error condition.
.Sh ERRORS
The
.Fn aio_error
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.
.El
.Sh SEE ALSO
.Xr aio_cancel 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 ,
.Xr aio 4
.Sh STANDARDS
The
.Fn aio_error
system call
is expected to conform to the
.St -p1003.1
standard.
.Sh HISTORY
The
.Fn aio_error
system call first appeared in
.Fx 3.0 .
.Sh AUTHORS
This
manual page was written by
.An Wes Peters Aq wes@softweyr.com .