mirror of https://github.com/python/cpython
463 lines
17 KiB
Python
463 lines
17 KiB
Python
from test.support import verbose, reap_children
|
|
from test.support.import_helper import import_module
|
|
|
|
# Skip these tests if termios or fcntl are not available
|
|
import_module('termios')
|
|
import_module("fcntl")
|
|
|
|
import errno
|
|
import os
|
|
import pty
|
|
import tty
|
|
import sys
|
|
import select
|
|
import signal
|
|
import socket
|
|
import io # readline
|
|
import unittest
|
|
|
|
import struct
|
|
import tty
|
|
import fcntl
|
|
import warnings
|
|
|
|
TEST_STRING_1 = b"I wish to buy a fish license.\n"
|
|
TEST_STRING_2 = b"For my pet fish, Eric.\n"
|
|
|
|
try:
|
|
_TIOCGWINSZ = tty.TIOCGWINSZ
|
|
_TIOCSWINSZ = tty.TIOCSWINSZ
|
|
_HAVE_WINSZ = True
|
|
except AttributeError:
|
|
_HAVE_WINSZ = False
|
|
|
|
if verbose:
|
|
def debug(msg):
|
|
print(msg)
|
|
else:
|
|
def debug(msg):
|
|
pass
|
|
|
|
|
|
# Note that os.read() is nondeterministic so we need to be very careful
|
|
# to make the test suite deterministic. A normal call to os.read() may
|
|
# give us less than expected.
|
|
#
|
|
# Beware, on my Linux system, if I put 'foo\n' into a terminal fd, I get
|
|
# back 'foo\r\n' at the other end. The behavior depends on the termios
|
|
# setting. The newline translation may be OS-specific. To make the
|
|
# test suite deterministic and OS-independent, the functions _readline
|
|
# and normalize_output can be used.
|
|
|
|
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. 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(b'\r\r\n'):
|
|
return data.replace(b'\r\r\n', b'\n')
|
|
|
|
if data.endswith(b'\r\n'):
|
|
return data.replace(b'\r\n', b'\n')
|
|
|
|
return data
|
|
|
|
def _readline(fd):
|
|
"""Read one line. May block forever if no newline is read."""
|
|
reader = io.FileIO(fd, mode='rb', closefd=False)
|
|
return reader.readline()
|
|
|
|
def expectedFailureIfStdinIsTTY(fun):
|
|
# avoid isatty()
|
|
try:
|
|
tty.tcgetattr(pty.STDIN_FILENO)
|
|
return unittest.expectedFailure(fun)
|
|
except tty.error:
|
|
pass
|
|
return fun
|
|
|
|
def _get_term_winsz(fd):
|
|
s = struct.pack("HHHH", 0, 0, 0, 0)
|
|
return fcntl.ioctl(fd, _TIOCGWINSZ, s)
|
|
|
|
def _set_term_winsz(fd, winsz):
|
|
fcntl.ioctl(fd, _TIOCSWINSZ, winsz)
|
|
|
|
|
|
# Marginal testing of pty suite. Cannot do extensive 'do or fail' testing
|
|
# because pty code is not too portable.
|
|
class PtyTest(unittest.TestCase):
|
|
def setUp(self):
|
|
old_alarm = signal.signal(signal.SIGALRM, self.handle_sig)
|
|
self.addCleanup(signal.signal, signal.SIGALRM, old_alarm)
|
|
|
|
old_sighup = signal.signal(signal.SIGHUP, self.handle_sighup)
|
|
self.addCleanup(signal.signal, signal.SIGHUP, old_sighup)
|
|
|
|
# isatty() and close() can hang on some platforms. Set an alarm
|
|
# before running the test to make sure we don't hang forever.
|
|
self.addCleanup(signal.alarm, 0)
|
|
signal.alarm(10)
|
|
|
|
# Save original stdin window size
|
|
self.stdin_rows = None
|
|
self.stdin_cols = None
|
|
if _HAVE_WINSZ:
|
|
try:
|
|
stdin_dim = os.get_terminal_size(pty.STDIN_FILENO)
|
|
self.stdin_rows = stdin_dim.lines
|
|
self.stdin_cols = stdin_dim.columns
|
|
old_stdin_winsz = struct.pack("HHHH", self.stdin_rows,
|
|
self.stdin_cols, 0, 0)
|
|
self.addCleanup(_set_term_winsz, pty.STDIN_FILENO, old_stdin_winsz)
|
|
except OSError:
|
|
pass
|
|
|
|
def handle_sig(self, sig, frame):
|
|
self.fail("isatty hung")
|
|
|
|
@staticmethod
|
|
def handle_sighup(signum, frame):
|
|
pass
|
|
|
|
@expectedFailureIfStdinIsTTY
|
|
def test_openpty(self):
|
|
try:
|
|
mode = tty.tcgetattr(pty.STDIN_FILENO)
|
|
except tty.error:
|
|
# not a tty or bad/closed fd
|
|
debug("tty.tcgetattr(pty.STDIN_FILENO) failed")
|
|
mode = None
|
|
|
|
new_stdin_winsz = None
|
|
if self.stdin_rows is not None and self.stdin_cols is not None:
|
|
try:
|
|
# Modify pty.STDIN_FILENO window size; we need to
|
|
# check if pty.openpty() is able to set pty slave
|
|
# window size accordingly.
|
|
debug("Setting pty.STDIN_FILENO window size")
|
|
debug(f"original size: (rows={self.stdin_rows}, cols={self.stdin_cols})")
|
|
target_stdin_rows = self.stdin_rows + 1
|
|
target_stdin_cols = self.stdin_cols + 1
|
|
debug(f"target size: (rows={target_stdin_rows}, cols={target_stdin_cols})")
|
|
target_stdin_winsz = struct.pack("HHHH", target_stdin_rows,
|
|
target_stdin_cols, 0, 0)
|
|
_set_term_winsz(pty.STDIN_FILENO, target_stdin_winsz)
|
|
|
|
# Were we able to set the window size
|
|
# of pty.STDIN_FILENO successfully?
|
|
new_stdin_winsz = _get_term_winsz(pty.STDIN_FILENO)
|
|
self.assertEqual(new_stdin_winsz, target_stdin_winsz,
|
|
"pty.STDIN_FILENO window size unchanged")
|
|
except OSError:
|
|
warnings.warn("Failed to set pty.STDIN_FILENO window size")
|
|
pass
|
|
|
|
try:
|
|
debug("Calling pty.openpty()")
|
|
try:
|
|
master_fd, slave_fd = pty.openpty(mode, new_stdin_winsz)
|
|
except TypeError:
|
|
master_fd, slave_fd = pty.openpty()
|
|
debug(f"Got master_fd '{master_fd}', slave_fd '{slave_fd}'")
|
|
except OSError:
|
|
# " An optional feature could not be imported " ... ?
|
|
raise unittest.SkipTest("Pseudo-terminals (seemingly) not functional.")
|
|
|
|
# closing master_fd can raise a SIGHUP if the process is
|
|
# the session leader: we installed a SIGHUP signal handler
|
|
# to ignore this signal.
|
|
self.addCleanup(os.close, master_fd)
|
|
self.addCleanup(os.close, slave_fd)
|
|
|
|
self.assertTrue(os.isatty(slave_fd), "slave_fd is not a tty")
|
|
|
|
if mode:
|
|
self.assertEqual(tty.tcgetattr(slave_fd), mode,
|
|
"openpty() failed to set slave termios")
|
|
if new_stdin_winsz:
|
|
self.assertEqual(_get_term_winsz(slave_fd), new_stdin_winsz,
|
|
"openpty() failed to set slave window size")
|
|
|
|
# Ensure the fd is non-blocking in case there's nothing to read.
|
|
blocking = os.get_blocking(master_fd)
|
|
try:
|
|
os.set_blocking(master_fd, False)
|
|
try:
|
|
s1 = os.read(master_fd, 1024)
|
|
self.assertEqual(b'', s1)
|
|
except OSError as e:
|
|
if e.errno != errno.EAGAIN:
|
|
raise
|
|
finally:
|
|
# Restore the original flags.
|
|
os.set_blocking(master_fd, blocking)
|
|
|
|
debug("Writing to slave_fd")
|
|
os.write(slave_fd, TEST_STRING_1)
|
|
s1 = _readline(master_fd)
|
|
self.assertEqual(b'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 = _readline(master_fd)
|
|
self.assertEqual(b'For my pet fish, Eric.\n', normalize_output(s2))
|
|
|
|
def test_fork(self):
|
|
debug("calling pty.fork()")
|
|
pid, master_fd = pty.fork()
|
|
self.addCleanup(os.close, master_fd)
|
|
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 raise 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(str(data.replace(b'\r\n', b'\n'),
|
|
encoding='ascii'))
|
|
|
|
##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 = os.waitstatus_to_exitcode(status)
|
|
debug("Child (%d) exited with code %d (status %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 OSError:
|
|
## pass
|
|
##else:
|
|
## raise TestFailed("Read from master_fd did not raise exception")
|
|
|
|
def test_master_read(self):
|
|
# XXX(nnorwitz): this test leaks fds when there is an error.
|
|
debug("Calling pty.openpty()")
|
|
master_fd, slave_fd = pty.openpty()
|
|
debug(f"Got master_fd '{master_fd}', slave_fd '{slave_fd}'")
|
|
|
|
self.addCleanup(os.close, master_fd)
|
|
|
|
debug("Closing slave_fd")
|
|
os.close(slave_fd)
|
|
|
|
debug("Reading from master_fd")
|
|
try:
|
|
data = os.read(master_fd, 1)
|
|
except OSError: # Linux
|
|
data = b""
|
|
|
|
self.assertEqual(data, b"")
|
|
|
|
def test_spawn_doesnt_hang(self):
|
|
pty.spawn([sys.executable, '-c', 'print("hi there")'])
|
|
|
|
class SmallPtyTests(unittest.TestCase):
|
|
"""These tests don't spawn children or hang."""
|
|
|
|
def setUp(self):
|
|
self.orig_stdin_fileno = pty.STDIN_FILENO
|
|
self.orig_stdout_fileno = pty.STDOUT_FILENO
|
|
self.orig_pty_close = pty.close
|
|
self.orig_pty__copy = pty._copy
|
|
self.orig_pty_fork = pty.fork
|
|
self.orig_pty_select = pty.select
|
|
self.orig_pty_setraw = pty.setraw
|
|
self.orig_pty_tcgetattr = pty.tcgetattr
|
|
self.orig_pty_tcsetattr = pty.tcsetattr
|
|
self.orig_pty_waitpid = pty.waitpid
|
|
self.fds = [] # A list of file descriptors to close.
|
|
self.files = []
|
|
self.select_rfds_lengths = []
|
|
self.select_rfds_results = []
|
|
self.tcsetattr_mode_setting = None
|
|
|
|
def tearDown(self):
|
|
pty.STDIN_FILENO = self.orig_stdin_fileno
|
|
pty.STDOUT_FILENO = self.orig_stdout_fileno
|
|
pty.close = self.orig_pty_close
|
|
pty._copy = self.orig_pty__copy
|
|
pty.fork = self.orig_pty_fork
|
|
pty.select = self.orig_pty_select
|
|
pty.setraw = self.orig_pty_setraw
|
|
pty.tcgetattr = self.orig_pty_tcgetattr
|
|
pty.tcsetattr = self.orig_pty_tcsetattr
|
|
pty.waitpid = self.orig_pty_waitpid
|
|
for file in self.files:
|
|
try:
|
|
file.close()
|
|
except OSError:
|
|
pass
|
|
for fd in self.fds:
|
|
try:
|
|
os.close(fd)
|
|
except OSError:
|
|
pass
|
|
|
|
def _pipe(self):
|
|
pipe_fds = os.pipe()
|
|
self.fds.extend(pipe_fds)
|
|
return pipe_fds
|
|
|
|
def _socketpair(self):
|
|
socketpair = socket.socketpair()
|
|
self.files.extend(socketpair)
|
|
return socketpair
|
|
|
|
def _mock_select(self, rfds, wfds, xfds, timeout=0):
|
|
# This will raise IndexError when no more expected calls exist.
|
|
# This ignores the timeout
|
|
self.assertEqual(self.select_rfds_lengths.pop(0), len(rfds))
|
|
return self.select_rfds_results.pop(0), [], []
|
|
|
|
def _make_mock_fork(self, pid):
|
|
def mock_fork():
|
|
return (pid, 12)
|
|
return mock_fork
|
|
|
|
def _mock_tcsetattr(self, fileno, opt, mode):
|
|
self.tcsetattr_mode_setting = mode
|
|
|
|
def test__copy_to_each(self):
|
|
"""Test the normal data case on both master_fd and stdin."""
|
|
read_from_stdout_fd, mock_stdout_fd = self._pipe()
|
|
pty.STDOUT_FILENO = mock_stdout_fd
|
|
mock_stdin_fd, write_to_stdin_fd = self._pipe()
|
|
pty.STDIN_FILENO = mock_stdin_fd
|
|
socketpair = self._socketpair()
|
|
masters = [s.fileno() for s in socketpair]
|
|
|
|
# Feed data. Smaller than PIPEBUF. These writes will not block.
|
|
os.write(masters[1], b'from master')
|
|
os.write(write_to_stdin_fd, b'from stdin')
|
|
|
|
# Expect two select calls, the last one will cause IndexError
|
|
pty.select = self._mock_select
|
|
self.select_rfds_lengths.append(2)
|
|
self.select_rfds_results.append([mock_stdin_fd, masters[0]])
|
|
self.select_rfds_lengths.append(2)
|
|
|
|
with self.assertRaises(IndexError):
|
|
pty._copy(masters[0])
|
|
|
|
# Test that the right data went to the right places.
|
|
rfds = select.select([read_from_stdout_fd, masters[1]], [], [], 0)[0]
|
|
self.assertEqual([read_from_stdout_fd, masters[1]], rfds)
|
|
self.assertEqual(os.read(read_from_stdout_fd, 20), b'from master')
|
|
self.assertEqual(os.read(masters[1], 20), b'from stdin')
|
|
|
|
def test__copy_eof_on_all(self):
|
|
"""Test the empty read EOF case on both master_fd and stdin."""
|
|
read_from_stdout_fd, mock_stdout_fd = self._pipe()
|
|
pty.STDOUT_FILENO = mock_stdout_fd
|
|
mock_stdin_fd, write_to_stdin_fd = self._pipe()
|
|
pty.STDIN_FILENO = mock_stdin_fd
|
|
socketpair = self._socketpair()
|
|
masters = [s.fileno() for s in socketpair]
|
|
|
|
socketpair[1].close()
|
|
os.close(write_to_stdin_fd)
|
|
|
|
pty.select = self._mock_select
|
|
self.select_rfds_lengths.append(2)
|
|
self.select_rfds_results.append([mock_stdin_fd, masters[0]])
|
|
# We expect that both fds were removed from the fds list as they
|
|
# both encountered an EOF before the second select call.
|
|
self.select_rfds_lengths.append(0)
|
|
|
|
# We expect the function to return without error.
|
|
self.assertEqual(pty._copy(masters[0]), None)
|
|
|
|
def test__restore_tty_mode_normal_return(self):
|
|
"""Test that spawn resets the tty mode no when _copy returns normally."""
|
|
|
|
# PID 1 is returned from mocked fork to run the parent branch
|
|
# of code
|
|
pty.fork = self._make_mock_fork(1)
|
|
|
|
status_sentinel = object()
|
|
pty.waitpid = lambda _1, _2: [None, status_sentinel]
|
|
pty.close = lambda _: None
|
|
|
|
pty._copy = lambda _1, _2, _3: None
|
|
|
|
mode_sentinel = object()
|
|
pty.tcgetattr = lambda fd: mode_sentinel
|
|
pty.tcsetattr = self._mock_tcsetattr
|
|
pty.setraw = lambda _: None
|
|
|
|
self.assertEqual(pty.spawn([]), status_sentinel, "pty.waitpid process status not returned by pty.spawn")
|
|
self.assertEqual(self.tcsetattr_mode_setting, mode_sentinel, "pty.tcsetattr not called with original mode value")
|
|
|
|
|
|
def tearDownModule():
|
|
reap_children()
|
|
|
|
|
|
if __name__ == "__main__":
|
|
unittest.main()
|