| import errno |
| import fcntl |
| import pty |
| import os |
| import sys |
| import signal |
| from test.test_support import verbose, TestSkipped, run_unittest |
| import unittest |
| |
| TEST_STRING_1 = "I wish to buy a fish license.\n" |
| TEST_STRING_2 = "For my pet fish, Eric.\n" |
| |
| if verbose: |
| def debug(msg): |
| print msg |
| else: |
| def debug(msg): |
| pass |
| |
| |
| def normalize_output(data): |
| # Some operating systems do conversions on newline. We could possibly |
| # fix that by doing the appropriate termios.tcsetattr()s. I couldn't |
| # figure out the right combo on Tru64 and I don't have an IRIX box. |
| # So just normalize the output and doc the problem O/Ses by allowing |
| # certain combinations for some platforms, but avoid allowing other |
| # differences (like extra whitespace, trailing garbage, etc.) |
| |
| # This is about the best we can do without getting some feedback |
| # from someone more knowledgable. |
| |
| # OSF/1 (Tru64) apparently turns \n into \r\r\n. |
| if data.endswith('\r\r\n'): |
| return data.replace('\r\r\n', '\n') |
| |
| # IRIX apparently turns \n into \r\n. |
| if data.endswith('\r\n'): |
| return data.replace('\r\n', '\n') |
| |
| return data |
| |
| |
| # Marginal testing of pty suite. Cannot do extensive 'do or fail' testing |
| # because pty code is not too portable. |
| # XXX(nnorwitz): these tests leak fds when there is an error. |
| class PtyTest(unittest.TestCase): |
| def setUp(self): |
| # isatty() and close() can hang on some platforms. Set an alarm |
| # before running the test to make sure we don't hang forever. |
| self.old_alarm = signal.signal(signal.SIGALRM, self.handle_sig) |
| signal.alarm(10) |
| |
| def tearDown(self): |
| # remove alarm, restore old alarm handler |
| signal.alarm(0) |
| signal.signal(signal.SIGALRM, self.old_alarm) |
| |
| def handle_sig(self, sig, frame): |
| self.fail("isatty hung") |
| |
| def test_basic(self): |
| try: |
| debug("Calling master_open()") |
| master_fd, slave_name = pty.master_open() |
| debug("Got master_fd '%d', slave_name '%s'" % |
| (master_fd, slave_name)) |
| debug("Calling slave_open(%r)" % (slave_name,)) |
| slave_fd = pty.slave_open(slave_name) |
| debug("Got slave_fd '%d'" % slave_fd) |
| except OSError: |
| # " An optional feature could not be imported " ... ? |
| raise TestSkipped, "Pseudo-terminals (seemingly) not functional." |
| |
| self.assertTrue(os.isatty(slave_fd), 'slave_fd is not a tty') |
| |
| # Solaris requires reading the fd before anything is returned. |
| # My guess is that since we open and close the slave fd |
| # in master_open(), we need to read the EOF. |
| |
| # Ensure the fd is non-blocking in case there's nothing to read. |
| orig_flags = fcntl.fcntl(master_fd, fcntl.F_GETFL) |
| fcntl.fcntl(master_fd, fcntl.F_SETFL, orig_flags | os.O_NONBLOCK) |
| try: |
| s1 = os.read(master_fd, 1024) |
| self.assertEquals('', s1) |
| except OSError, e: |
| if e.errno != errno.EAGAIN: |
| raise |
| # Restore the original flags. |
| fcntl.fcntl(master_fd, fcntl.F_SETFL, orig_flags) |
| |
| debug("Writing to slave_fd") |
| os.write(slave_fd, TEST_STRING_1) |
| s1 = os.read(master_fd, 1024) |
| self.assertEquals('I wish to buy a fish license.\n', |
| normalize_output(s1)) |
| |
| debug("Writing chunked output") |
| os.write(slave_fd, TEST_STRING_2[:5]) |
| os.write(slave_fd, TEST_STRING_2[5:]) |
| s2 = os.read(master_fd, 1024) |
| self.assertEquals('For my pet fish, Eric.\n', normalize_output(s2)) |
| |
| os.close(slave_fd) |
| os.close(master_fd) |
| |
| |
| def test_fork(self): |
| debug("calling pty.fork()") |
| pid, master_fd = pty.fork() |
| if pid == pty.CHILD: |
| # stdout should be connected to a tty. |
| if not os.isatty(1): |
| debug("Child's fd 1 is not a tty?!") |
| os._exit(3) |
| |
| # After pty.fork(), the child should already be a session leader. |
| # (on those systems that have that concept.) |
| debug("In child, calling os.setsid()") |
| try: |
| os.setsid() |
| except OSError: |
| # Good, we already were session leader |
| debug("Good: OSError was raised.") |
| pass |
| except AttributeError: |
| # Have pty, but not setsid()? |
| debug("No setsid() available?") |
| pass |
| except: |
| # We don't want this error to propagate, escaping the call to |
| # os._exit() and causing very peculiar behavior in the calling |
| # regrtest.py ! |
| # Note: could add traceback printing here. |
| debug("An unexpected error was raised.") |
| os._exit(1) |
| else: |
| debug("os.setsid() succeeded! (bad!)") |
| os._exit(2) |
| os._exit(4) |
| else: |
| debug("Waiting for child (%d) to finish." % pid) |
| # In verbose mode, we have to consume the debug output from the |
| # child or the child will block, causing this test to hang in the |
| # parent's waitpid() call. The child blocks after a |
| # platform-dependent amount of data is written to its fd. On |
| # Linux 2.6, it's 4000 bytes and the child won't block, but on OS |
| # X even the small writes in the child above will block it. Also |
| # on Linux, the read() will throw an OSError (input/output error) |
| # when it tries to read past the end of the buffer but the child's |
| # already exited, so catch and discard those exceptions. It's not |
| # worth checking for EIO. |
| while True: |
| try: |
| data = os.read(master_fd, 80) |
| except OSError: |
| break |
| if not data: |
| break |
| sys.stdout.write(data.replace('\r\n', '\n')) |
| |
| ##line = os.read(master_fd, 80) |
| ##lines = line.replace('\r\n', '\n').split('\n') |
| ##if False and lines != ['In child, calling os.setsid()', |
| ## 'Good: OSError was raised.', '']: |
| ## raise TestFailed("Unexpected output from child: %r" % line) |
| |
| (pid, status) = os.waitpid(pid, 0) |
| res = status >> 8 |
| debug("Child (%d) exited with status %d (%d)." % (pid, res, status)) |
| if res == 1: |
| self.fail("Child raised an unexpected exception in os.setsid()") |
| elif res == 2: |
| self.fail("pty.fork() failed to make child a session leader.") |
| elif res == 3: |
| self.fail("Child spawned by pty.fork() did not have a tty as stdout") |
| elif res != 4: |
| self.fail("pty.fork() failed for unknown reasons.") |
| |
| ##debug("Reading from master_fd now that the child has exited") |
| ##try: |
| ## s1 = os.read(master_fd, 1024) |
| ##except os.error: |
| ## pass |
| ##else: |
| ## raise TestFailed("Read from master_fd did not raise exception") |
| |
| os.close(master_fd) |
| |
| # pty.fork() passed. |
| |
| def test_main(verbose=None): |
| run_unittest(PtyTest) |
| |
| if __name__ == "__main__": |
| test_main() |