If $sysname isn't set after calling ndb/cs, give it a default value.
Alternatively this could have been done inside ndb/cs as a last
resort, but putting it here allows setting a different default
in termrc.local or cpurc.local if desired.

Reference: /n/sources/patch/applied/sysname-default
Date: Mon May 21 13:25:47 CES 2007
Signed-off-by: miller@hamnavoe.com

--- /rc/bin/cpurc	Mon May 21 13:20:33 2007
+++ /rc/bin/cpurc	Mon May 21 13:20:29 2007
@@ -12,11 +12,15 @@
 # parallelism for mk
 NPROC = `{wc -l </dev/sysstat}
 
-prompt=($sysname^'# ' '	')
-
 # site-specific startup
 if(test -e /rc/bin/cpurc.local)
 	. /rc/bin/cpurc.local
+
+if(~ $sysname '') {
+	sysname=gnot
+	echo -n $sysname >/dev/sysname
+}
+prompt=($sysname^'# ' '	')
 
 # cpu-specific startup such as
 # ip/ipconfig ether /dev/ether0 ip gw ...
--- /rc/bin/termrc	Mon May 21 13:20:51 2007
+++ /rc/bin/termrc	Mon May 21 13:20:48 2007
@@ -25,6 +25,10 @@
 if(! test -e /srv/cs)
 	ndb/cs -f $NDBFILE
 sysname=`{cat /dev/sysname}
+if(~ $sysname '') {
+	sysname=gnot
+	echo -n $sysname >/dev/sysname
+}
 
 # machine specific startup (e.g., for devices not probed)
 if(test -e /cfg/$sysname/termrc)