Remove ISDN4BSD (I4B) from HEAD as it is not MPSAFE and

parts relied on the now removed NET_NEEDS_GIANT.
Most of I4B has been disconnected from the build
since July 2007 in HEAD/RELENG_7.

This is what was removed:
- configuration in /etc/isdn
- examples
- man pages
- kernel configuration
- sys/i4b (drivers, layers, include files)
- user space tools
- i4b support from ppp
- further documentation

Discussed with: rwatson, re

1 files changed, 2 insertions, 18 deletions

diff --git a/usr.sbin/ppp/ppp.8.m4 b/usr.sbin/ppp/ppp.8.m4
index 705e366..b42c13c 100644
--- a/usr.sbin/ppp/ppp.8.m4
+++ b/usr.sbin/ppp/ppp.8.m4
@@ -344,13 +344,6 @@ conventional serial device.
 UDP connections force
 .Nm
 into synchronous mode.
-.It Supports PPP over ISDN.
-If
-.Nm
-is given a raw B-channel i4b device to open as a link, it is able to talk
-to the
-.Xr isdnd 8
-daemon to establish an ISDN connection.
 .It Supports PPP over Ethernet (rfc 2516).
 If
 .Nm
@@ -4456,12 +4449,6 @@ for carrier.
 .Pp
 As ptys do not support the TIOCMGET ioctl, the tty device will switch all
 carrier detection off when it detects that the device is a pty.
-.It ISDN (i4b) Devices
-Carrier is checked once per second for 6 seconds.
-If it is not set after
-the sixth second, the connection attempt is considered to have failed and
-the device is closed.
-Carrier is always required for i4b devices.
 .It PPPoE (netgraph) Devices
 Carrier is checked once per second for 5 seconds.
 If it is not set after
@@ -4588,11 +4575,9 @@ This sets the device(s) to which
 will talk to the given
 .Dq value .
 .Pp
-All ISDN and serial device names are expected to begin with
+All serial device names are expected to begin with
 .Pa /dev/ .
-ISDN devices are usually called
-.Pa i4brbchX
-and serial devices are usually called
+Serial devices are usually called
 .Pa cuaXX .
 .Pp
 If
@@ -6090,7 +6075,6 @@ ifdef({LOCALRAD},{},{.Xr libradius 3 ,
 .Xr getty 8 ,
 .Xr inetd 8 ,
 .Xr init 8 ,
-.Xr isdnd 8 ,
 .Xr named 8 ,
 .Xr ping 8 ,
 .Xr pppctl 8 ,