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.\" $FreeBSD: src/lib/libc/sys/aio_error.2,v 1.6.2.6 2001/12/14 18:34:00 ru Exp $
.\" $DragonFly: src/lib/libc/sys/aio_error.2,v 1.3 2007/06/30 19:03:52 swildner 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
.Fn aio_error "const struct aiocb *iocb"
.Sh DESCRIPTION
The
.Fn aio_error
function returns the error status of the asynchronous I/O request
associated with the structure pointed to by
.Fa iocb .
.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
.Va errno
to indicate the error condition.
.Sh ERRORS
The
.Fn aio_error
function will fail if:
.Bl -tag -width Er
.It Bq Er EINVAL
.Fa iocb
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
.Sh STANDARDS
.Fn aio_error
is expected to conform to the
.St -p1003.2
standard.
.Sh HISTORY
The
.Nm
function first appeared in
.Fx 3.0 .
.Sh AUTHORS
This
manual page was written by
.An Wes Peters Aq wes@softweyr.com .