/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
 5import sys
 6import os
 7
 8verbose = (sys.argv[1] == 'v')
 9try:
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
22except StandardError:
23    if verbose:
24        raise
25    sys.exit(1)