[strongwind] Set the process group of our launched application

[Brad Taylor <btaylor src gnome org>]

commit 422ff2bb37836e4937c4ba5091310a40f7ae4f08
Author: Brad Taylor <brad getcoded net>
Date:   Tue Jun 16 09:43:00 2009 -0400

    Set the process group of our launched application
    
    This allows the application and all of its children to be killed with
    os.killpg(proc.pid, signal.SIGKILL).  (#585983)

 ChangeLog           |    6 ++++++
 strongwind/cache.py |    9 ++++++++-
 2 files changed, 14 insertions(+), 1 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index 6eb3eb2..e75a520 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2009-06-16  Brad Taylor  <brad getcoded net>
+
+	* strongwind/cache.py: Set the process group of our launched
+	application so that the application and its children can be killed with
+	os.killpg(proc.pid, signal.SIGKILL).  (#585983)
+
 2009-04-07  Brian G. Merrell  <bgmerrell novell com>
 	
 	* strongwind/accessibles.py: No longer cache the log name as the
diff --git a/strongwind/cache.py b/strongwind/cache.py
index 4a53cf8..7aed1c3 100644
--- a/strongwind/cache.py
+++ b/strongwind/cache.py
@@ -235,8 +235,15 @@ def launchApplication(args=[], name=None, find=None, cwd=None, env=None, wait=co
     # instance of the application already open
     existingApp = findAppWithLargestId(_desktop, find)
 
+    def group_setup():
+        '''
+        Ensure that all forked processes keep the same process group so that
+        they can be killed with os.killpg(proc.pid, signal.SIGTERM) later.
+        '''
+        os.setpgid(0, 0)
+
     # launch the application
-    subproc = subprocess.Popen(args, cwd=cwd, env=env)
+    subproc = subprocess.Popen(args, cwd=cwd, env=env, preexec_fn=group_setup)
 
     # wait for the application to launch and for the applications list to
     # settle.  if we try to list the desktop's applications too soon, we get