Change how output is logged to make it easier to use from the web

interface, and so the textarea on the web page can be updated in
real time as it runs.

event/linktest/linktest_control.in

@@ -232,7 +232,7 @@ sub handler($)
     $SIG{INT}  = 'IGNORE';
 
     if (defined($child_pid)) {
-	kill('TERM', $child_pid);
+	kill('HUP', $child_pid);
 	waitpid($child_pid, 0);
 	undef($child_pid);
     }
@@ -245,9 +245,15 @@ sub handler($)
 # Fork a child to run the actual linktest script. The parent just waits
 # for child to exit, or to be signaled to terminate the child.
 #
-if (($child_pid = fork()) < 0) {
+if (defined($output)) {
+    $child_pid = TBBackGround($output);
+}
+else {
+    $child_pid = fork();
+}
+if ($child_pid < 0) {
     die("*** $0:\n".
-	"    Linktest could not fork a new process for $pid/$eid!\n")
+	"    Linktest could not fork a new process for $pid/$eid!\n");
 }
 
 if ($child_pid) {
@@ -271,14 +277,14 @@ if ($child_pid) {
 # We tell ssh to allocate a tty so that we can kill it with TERM and have
 # everything die off properly.
 #
-my @cmdargs = ("$SSH", "-1", "-F", "/dev/null",
-	       "-host", $CONTROL, "$TB/sbin/linktest.proxy");
+# XXX: "-t -t" to ssh is so that kill -TERM carries across to ops. 
+#
+my @cmdargs = ("$SSH", "-t", "-t", "-1", "-F", "/dev/null",
+	       "-host", $CONTROL, "exec", "$TB/sbin/linktest.proxy");
 push(@cmdargs, ("-d", "$debug"))
     if ($debug);
 push(@cmdargs, ("-t", "$timeout"))
     if (defined($timeout));
-push(@cmdargs, ("-o", "$output"))
-    if (defined($output));
 push(@cmdargs, "-l");
 push(@cmdargs, (defined($level) ? $level : $linktest_level));
 push(@cmdargs, ("-g", $unix_gidname));