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.\" $FreeBSD: /repoman/r/ncvs/src/lib/libc/sys/aio_error.2,v 1.20 2006/09/26 09:47:46 vd Exp $
.\"
.Dd May 4, 2007
.Dt AIO_ERROR 3
.Os
.Sh NAME
.Nm aio_error
.Nd retrieve error status of asynchronous I/O operation (REALTIME)
.Sh LIBRARY
.Lb librt
.Sh SYNOPSIS
.In aio.h
.Ft int
.Fn aio_error "const struct aiocb *aiocbp"
.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 .
On failure,
.Fn aio_error
returns \-1 and sets
.Va 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 aiocb
argument
does not reference an outstanding asynchronous I/O request.
.El
.Sh SEE ALSO
.Xr fsync 2 ,
.Xr read 2 ,
.Xr write 2 ,
.Xr aio_cancel 3 ,
.Xr aio_read 3 ,
.Xr aio_return 3 ,
.Xr aio_suspend 3 ,
.Xr aio_write 3
.Sh STANDARDS
The
.Fn aio_error
system call
is expected to conform to the
.St -p1003.1-2001
standard.
.Sh HISTORY
The
.Fn aio_error
system call first appeared in
.Nx 5.0 .