Added kill, terminate and send_signal to subprocess.Popen

The bits and pieces for the Windows side were already in place. The POSIX side is trivial (as usual) and uses os.kill().

Lib/subprocess.py

@@ -357,6 +357,7 @@ import os
 import types
 import traceback
 import gc
+import signal
 
 # Exception classes used by this module.
 class CalledProcessError(Exception):
@@ -384,6 +385,7 @@ if mswindows:
         from win32process import CreateProcess, STARTUPINFO, \
                                  GetExitCodeProcess, STARTF_USESTDHANDLES, \
                                  STARTF_USESHOWWINDOW, CREATE_NEW_CONSOLE
+        from win32process import TerminateProcess
         from win32event import WaitForSingleObject, INFINITE, WAIT_OBJECT_0
     else:
         from _subprocess import *
@@ -906,6 +908,21 @@ class Popen(object):
             self.wait()
             return (stdout, stderr)
 
+        def send_signal(self, sig):
+            """Send a signal to the process
+            """
+            if sig == signal.SIGTERM:
+                self.terminate()
+            else:
+                raise ValueError("Only SIGTERM is supported on Windows")
+
+        def terminate(self):
+            """Terminates the process
+            """
+            TerminateProcess(self._handle, 1)
+
+        kill = terminate
+
     else:
         #
         # POSIX methods
@@ -1184,6 +1201,21 @@ class Popen(object):
             self.wait()
             return (stdout, stderr)
 
+        def send_signal(self, sig):
+            """Send a signal to the process
+            """
+            os.kill(self.pid, sig)
+
+        def terminate(self):
+            """Terminate the process with SIGTERM
+            """
+            self.send_signal(signal.SIGTERM)
+
+        def kill(self):
+            """Kill the process with SIGKILL
+            """
+            self.send_signal(signal.SIGKILL)
+
 
 def _demo_posix():
     #