add hg and python

sys/lib/python/test/tf_inherit_check.py

@@ -0,0 +1,25 @@
+# Helper script for test_tempfile.py.  argv[2] is the number of a file
+# descriptor which should _not_ be open.  Check this by attempting to
+# write to it -- if we succeed, something is wrong.
+
+import sys
+import os
+
+verbose = (sys.argv[1] == 'v')
+try:
+    fd = int(sys.argv[2])
+
+    try:
+        os.write(fd, "blat")
+    except os.error:
+        # Success -- could not write to fd.
+        sys.exit(0)
+    else:
+        if verbose:
+            sys.stderr.write("fd %d is open in child" % fd)
+        sys.exit(1)
+
+except StandardError:
+    if verbose:
+        raise
+    sys.exit(1)