Add sl(4) and ppp(4).

Obtained from: NetBSD

share/man/man4/Makefile

@@ -3,8 +3,8 @@
 MAN4=	bpf.4 ccd.4 cd.4 ch.4 ddb.4 divert.4 drum.4 fd.4 \
 	icmp.4 ifmib.4 inet.4 intro.4 ip.4 ipfirewall.4 \
 	lkm.4 lo.4 netintro.4 \
-	null.4 pt.4 pty.4 route.4 \
-	scsi.4 sd.4 snp.4 st.4 su.4 tcp.4 \
+	null.4 ppp.4 pt.4 pty.4 route.4 \
+	scsi.4 sd.4 sl.4 snp.4 st.4 su.4 tcp.4 \
 	ttcp.4 termios.4 tty.4 udp.4 uk.4 update.4 unix.4 vn.4 worm.4 yp.4 \
 	zero.4
 

share/man/man4/ppp.4

@@ -0,0 +1,71 @@
+.\"	$NetBSD: ppp.4,v 1.1 1996/08/10 21:26:12 explorer Exp $
+.\"
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  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 the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
+.\"
+.\"     From:	@(#)lo.4	8.1 (Berkeley) 6/5/93
+.\"
+.Dd August 10, 1996
+.Dt PPP 4
+.Os
+.Sh NAME
+.Nm ppp
+.Nd point to point protocol network interface
+.Sh SYNOPSIS
+.Cd "pseudo-device ppp" Op Ar count
+.Sh DESCRIPTION
+The
+.Nm ppp
+interface allows serial lines to be used as network interfaces using the
+.Em point-to-point
+protocol.  The
+.Nm ppp
+interface can use various types of compression and has many features over
+the
+.Xr sl 4
+protocol.
+.Sh DIAGNOSTICS
+.Bl -diag
+.It ppp%d: af%d not supported.
+The interface was handed
+a message with addresses formatted in an unsuitable address
+family; the packet was dropped.
+.El
+.Sh SEE ALSO
+.Xr intro 4 ,
+.Xr inet 4 ,
+.Xr sl 4 ,
+.Xr pppd 8 ,
+.Xr pppstats 8
+.Sh BUGS
+Currently, only the
+.Xr ip 4
+protocol is supported.

share/man/man4/sl.4

@@ -0,0 +1,64 @@
+.\"	$NetBSD: sl.4,v 1.1 1996/08/10 21:26:14 explorer Exp $
+.\"
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  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 the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
+.\"
+.\"     From:	@(#)lo.4	8.1 (Berkeley) 6/5/93
+.\"
+.Dd August 10, 1996
+.Dt SL 4
+.Os
+.Sh NAME
+.Nm sl
+.Nd slip network interface
+.Sh SYNOPSIS
+.Cd "pseudo-device sl" Op Ar count
+.Sh DESCRIPTION
+The
+.Nm sl
+interface allows serial lines to be used as network interfaces using the
+.Em slip
+protocol.  The
+.Nm sl
+interface can use Van Jacobson TCP header compression and ICMP filtering.
+.Sh DIAGNOSTICS
+.Bl -diag
+.It sl%d: af%d not supported.
+The interface was handed
+a message with addresses formatted in an unsuitable address
+family; the packet was dropped.
+.El
+.Sh SEE ALSO
+.Xr intro 4 ,
+.Xr inet 4 ,
+.Xr slipattach 8 ,
+.Xr sliplogin 8 ,
+.Xr slstats 8