Lib/test/tf_inherit_check.py

   1 # Helper script for test_tempfile.py.  argv[2] is the number of a file
   2 # descriptor which should _not_ be open.  Check this by attempting to
   3 # write to it -- if we succeed, something is wrong.
   4
   5 import sys
   6 import os
   7
   8 verbose = (sys.argv[1] == 'v')
   9 try:
  10     fd = int(sys.argv[2])
  11
  12     try:
  13         os.write(fd, "blat")
  14     except os.error:
  15         # Success -- could not write to fd.
  16         sys.exit(0)
  17     else:
  18         if verbose:
  19             sys.stderr.write("fd %d is open in child" % fd)
  20         sys.exit(1)
  21
  22 except StandardError:
  23     if verbose:
  24         raise
  25     sys.exit(1)