Add a zero(4) man page to describe /dev/zero. Update null(4) to xref

this new man page.

1 files changed, 55 insertions, 0 deletions

diff --git a/share/man/man4/zero.4 b/share/man/man4/zero.4
new file mode 100644
index 0000000..78b3423
--- /dev/null
+++ b/share/man/man4/zero.4
@@ -0,0 +1,55 @@
+.\" Copyright (c) 1996
+.\"	Mike Pritchard <mpp@freebsd.org>.  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. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by Mike Pritchard and
+.\"	contributors.
+.\" 4. Neither the name of the author nor the names of its contributors
+.\"    may 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.
+.\"
+.Dd April 7, 1996
+.Dt ZERO 4
+.Os
+.Sh NAME
+.Nm zero
+.Nd the zero device
+.Sh DESCRIPTION
+The
+.Nm
+device accepts and reads data as any ordinary (and willing)
+file,
+but throws away any data written to it, and returns an endless
+supply of null bytes when read.
+.Sh FILES
+.Bl -tag -width /dev/zero
+.It Pa /dev/zero
+.El
+.Sh SEE ALSO
+.Xr null 4
+.Sh HISTORY
+A
+.Nm
+device appeared in
+.Bx 4.4 .