diff options
Diffstat (limited to 'Lib/test/test_pty.py')
| -rw-r--r-- | Lib/test/test_pty.py | 256 |
1 files changed, 143 insertions, 113 deletions
diff --git a/Lib/test/test_pty.py b/Lib/test/test_pty.py index 123c3f8..5ce387b 100644 --- a/Lib/test/test_pty.py +++ b/Lib/test/test_pty.py @@ -1,5 +1,9 @@ -import pty, os, sys, signal -from test.test_support import verbose, TestFailed, TestSkipped +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" @@ -11,6 +15,7 @@ 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 @@ -32,116 +37,141 @@ def normalize_output(data): return data + # Marginal testing of pty suite. Cannot do extensive 'do or fail' testing # because pty code is not too portable. - -def test_basic_pty(): - 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." - - if not os.isatty(slave_fd): - raise TestFailed, "slave_fd is not a tty" - - debug("Writing to slave_fd") - os.write(slave_fd, TEST_STRING_1) - s1 = os.read(master_fd, 1024) - sys.stdout.write(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) - sys.stdout.write(normalize_output(s2)) - - os.close(slave_fd) - os.close(master_fd) - -def handle_sig(sig, frame): - raise TestFailed, "isatty hung" - -# isatty() and close() can hang on some platforms -# set an alarm before running the test to make sure we don't hang forever -old_alarm = signal.signal(signal.SIGALRM, handle_sig) -signal.alarm(10) - -try: - test_basic_pty() -finally: - # remove alarm, restore old alarm handler - signal.alarm(0) - signal.signal(signal.SIGALRM, old_alarm) - -# basic pty passed. - -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) - ##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: - raise TestFailed, "Child raised an unexpected exception in os.setsid()" - elif res == 2: - raise TestFailed, "pty.fork() failed to make child a session leader." - elif res == 3: - raise TestFailed, "Child spawned by pty.fork() did not have a tty as stdout" - elif res != 4: - raise TestFailed, "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. +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') + + 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() |