Method check_close_std_fds

Lib/test/test_subprocess.py:2657–2680

(self, fds)

            os.close(saved)

    def check_close_std_fds(self, fds):
        # Issue #9905: test that subprocess pipes still work properly with
        # some standard fds closed
        stdin = 0
        saved_fds = self._save_fds(fds)
        for fd, saved, inheritable in saved_fds:
            if fd == 0:
                stdin = saved
                break
        try:
            for fd in fds:
                os.close(fd)
            out, err = subprocess.Popen([sys.executable, "-c",
                              'import sys;'
                              'sys.stdout.write("apple");'
                              'sys.stdout.flush();'
                              'sys.stderr.write("orange")'],
                       stdin=stdin,
                       stdout=subprocess.PIPE,
                       stderr=subprocess.PIPE).communicate()
            self.assertEqual(out, b'apple')
            self.assertEqual(err, b'orange')
        finally:
            self._restore_fds(saved_fds)

    def test_close_fd_0(self):
        self.check_close_std_fds([0])