summaryrefslogtreecommitdiffstats
path: root/Lib/test/tf_inherit_check.py
blob: 138f25a8580ea9a917970931d44fabde5e07b91f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
# 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
from test.support import SuppressCrashReport

with SuppressCrashReport():
    verbose = (sys.argv[1] == 'v')
    try:
        fd = int(sys.argv[2])

        try:
            os.write(fd, b"blat")
        except OSError:
            # 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 Exception:
        if verbose:
            raise
        sys.exit(1)