2 files changed, 62 insertions, 0 deletions

diff --git a/share/man/man4/Makefile b/share/man/man4/Makefile
index cf80fb81b2c0..eb802a7cb690 100644
--- a/share/man/man4/Makefile
+++ b/share/man/man4/Makefile
@@ -10,6 +10,7 @@ MAN=	aac.4 \
 	ahb.4 \
 	ahc.4 \
 	ahd.4 \
+	aio.4 \
 	amd.4 \
 	amr.4 \
 	an.4 \
diff --git a/share/man/man4/aio.4 b/share/man/man4/aio.4
new file mode 100644
index 000000000000..be7407d03a68
--- /dev/null
+++ b/share/man/man4/aio.4
@@ -0,0 +1,61 @@
+.\"-
+.\" Copyright (c) 2002 Dag-Erling Coïdan Smørgrav
+.\" 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.
+.\" 3. The name of the author may not be used to endorse or promote products
+.\"    derived from this software without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 THE AUTHOR 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.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd October 24, 2002
+.Dt AIO 4
+.Os
+.Sh NAME
+.Nm aio
+.Nd asynchronous I/O
+.Sh SYNOPSIS
+.Cd "options VFS_AIO"
+.Sh DESCRIPTION
+The
+.Nm
+facility provides system calls for asynchronous I/O.
+It is available both as a kernel option for static inclusion and as a
+dynamic kernel module.
+.Pp
+.Sh SEE ALSO
+.Xr aio_cancel 2 ,
+.Xr aio_error 2 ,
+.Xr aio_read 2 ,
+.Xr aio_return 2 ,
+.Xr aio_suspend 2 ,
+.Xr aio_waitcomplete 2 ,
+.Xr aio_write 2
+.Sh HISTORY
+The
+.Nm
+facility appeared as a kernel option in
+.Fx 3.0 .
+The
+.Nm
+kernel module appeared in
+.Fx 5.0 .