--- a/TerminalSession.st	Mon Feb 08 10:25:01 2016 +0100
+++ b/TerminalSession.st	Thu Feb 11 15:44:28 2016 +0100
@@ -532,7 +532,8 @@
     "send an INT-signal to the shell (UNIX only)"
 
     shellPid notNil ifTrue:[
-        OperatingSystem sendSignal:(OperatingSystem sigINT) to:shellPid negated.
+        OperatingSystem interruptProcessGroup:shellPid.
+        "/ OperatingSystem interruptProcess:shellPid. ???
     ].
 
     "Modified: / 10.6.1998 / 17:49:49 / cg"
@@ -542,7 +543,9 @@
     "send a KILL-signal to the shell (UNIX only)"
 
     shellPid notNil ifTrue:[
-        OperatingSystem sendSignal:(OperatingSystem sigKILL) to:shellPid negated.
+        OperatingSystem killProcessGroup:shellPid.
+        OperatingSystem killProcess:shellPid.
+        OperatingSystem childProcessWait:false pid:shellPid.
     ]
 !