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      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 from test.support import SuppressCrashReport
      8 
      9 with SuppressCrashReport():
     10     verbose = (sys.argv[1] == 'v')
     11     try:
     12         fd = int(sys.argv[2])
     13 
     14         try:
     15             os.write(fd, b"blat")
     16         except OSError:
     17             # Success -- could not write to fd.
     18             sys.exit(0)
     19         else:
     20             if verbose:
     21                 sys.stderr.write("fd %d is open in child" % fd)
     22             sys.exit(1)
     23 
     24     except Exception:
     25         if verbose:
     26             raise
     27         sys.exit(1)
     28