Patch by Zack W to make test_noinherit() more robust: spawn a Python

subprocess that does the right checks.  This now works on Windows as
well.

1 files changed, 25 insertions, 0 deletions

diff --git a/Lib/test/tf_inherit_check.py b/Lib/test/tf_inherit_check.py
new file mode 100644
index 0000000..a8b80d2
--- /dev/null
+++ b/Lib/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)