Method test_close_fds

tests/sh_test.py:664–688

(self)

            t.close()

    def test_close_fds(self):
        # guarantee some extra fds in our parent process that don't close on exec.
        # we have to explicitly do this because at some point (I believe python 3.4),
        # python started being more stringent with closing fds to prevent security
        # vulnerabilities.  python 2.7, for example, doesn't set CLOEXEC on
        # tempfile.TemporaryFile()s
        #
        # https://www.python.org/dev/peps/pep-0446/
        tmp = [tempfile.TemporaryFile() for i in range(10)]
        for t in tmp:
            flags = fcntl.fcntl(t.fileno(), fcntl.F_GETFD)
            flags &= ~fcntl.FD_CLOEXEC
            fcntl.fcntl(t.fileno(), fcntl.F_SETFD, flags)

        py = create_tmp_test(
            """
import os
print(os.listdir("/dev/fd"))
"""
        )
        out = python(py.name).strip()
        self.assertEqual(out, "['0', '1', '2', '3']")

        for t in tmp:
            t.close()

    def test_pass_fds(self):
        # guarantee some extra fds in our parent process that don't close on exec.