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
7from test.support import SuppressCrashReport
8
9with 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