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Subject: [9front] rconnect via aan reliability patch
Reply-To: 9front@9front.org
Precedence: bulk

With long distance or slow network, the aanclient in rconnect
occasionally could fail to read the aan address sent by aanserver
with error:

	read: error reading <stdin>: i/o on hungup channel

This patch adds an additional synchronization by sending a message
from aanclient back to aanserver.

diff 61f37abf576a02c7f1e3561cfaba3c0457f55c9d uncommitted
--- a//rc/bin/rconnect
+++ b//rc/bin/rconnect
@@ -50,11 +50,12 @@
 	fn aanserver {
 		~ $#netdir 1 || netdir=3D/net/tcp/clone
 		netdir=3D`{basename -d $netdir} || exit
-		<>$netdir/clone {
-			netdir=3D$netdir/`{read} || exit
+		<>[4]$netdir/clone {
+			netdir=3D$netdir/`{read <[0=3D4]} || exit
 			>[3] $netdir/ctl {
 				echo -n 'announce *!0' >[1=3D3]
 				echo `{cat $netdir/local} || exit
+				~ `{read} OK || exit
 				bind '#|' /mnt/aan || exit
 				exec aan -m $aanto $netdir =
<>/mnt/aan/data1 >[1=3D0] >[2]/dev/null &
 			}
@@ -72,7 +73,7 @@
 	}
 	fn aanclient {
 		host=3D`{echo $host | sed =
's/(.*)!([^!]+)$/\1/'}^!^`{read | sed 's/(.*)!([^!]+)$/\2/'} || exit
+		echo OK || exit
 		tlsclient -a -o <>{rfork s; aan -m $aanto -c $host =
>[1=3D0]} /bin/rc -c 'sendscript $*' $*
 	}
 	exec $argv0 -k $"keyspec $host <{builtin whatis aanserver; pvar =
aanto; echo aanserver} aanclient $*