Initial revision

Lib/idlelib/spawn.py

@@ -0,0 +1,59 @@
+# spawn - This is ugly, OS-specific code to spawn a separate process.  It
+#         also defines a function for getting the version of a path most
+#         likely to work with cranky API functions.
+
+import os
+
+def hardpath(path):
+    path = os.path.normcase(os.path.abspath(path))
+    try:
+        import win32api
+        path = win32api.GetShortPathName( path )
+    except:
+        pass
+    return path
+
+if hasattr(os, 'spawnv'):
+
+  # Windows-ish OS: we use spawnv(), and stick quotes around arguments
+  #   in case they contains spaces, since Windows will jam all the
+  #   arguments to spawn() or exec() together into one string.  The
+  #   kill_zombies function is a noop.
+
+  def spawn(bin, *args):
+    nargs = [bin]
+    for arg in args:
+      nargs.append( '"'+arg+'"' )
+    os.spawnv( os.P_NOWAIT, bin, nargs )
+
+  def kill_zombies(): pass
+
+elif hasattr(os, 'fork'):
+
+  # UNIX-ish operating system: we fork() and exec(), and we have to track
+  #   the pids of our children and call waitpid() on them to avoid leaving
+  #   zombies in the process table.  kill_zombies() does the dirty work, and
+  #   should be called periodically.
+
+  zombies = []
+
+  def spawn(bin, *args):
+    pid = os.fork()
+    if pid:
+      zombies.append(pid)
+    else:
+      os.execv( bin, (bin, ) + args )
+
+  def kill_zombies():
+      for z in zombies[:]:
+          stat = os.waitpid(z, os.WNOHANG)
+          if stat[0]==z:
+              zombies.remove(z)
+
+else:
+  # If you get here, you may be able to write an alternative implementation
+  # of these functions for your OS.
+
+  def kill_zombies(): pass
+
+  raise OSError, 'This OS does not support fork() or spawnv().'