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import array
import os
import struct
import sys
import threading
import unittest
from test import support
from test.support import threading_helper
from test.support.import_helper import import_module
fcntl = import_module('fcntl')
termios = import_module('termios')
class IoctlTestsTty(unittest.TestCase):
@classmethod
def setUpClass(cls):
TIOCGPGRP = support.get_attribute(termios, 'TIOCGPGRP')
try:
tty = open("/dev/tty", "rb")
except OSError:
raise unittest.SkipTest("Unable to open /dev/tty")
with tty:
# Skip if another process is in foreground
r = fcntl.ioctl(tty, TIOCGPGRP, struct.pack("i", 0))
rpgrp = struct.unpack("i", r)[0]
if rpgrp not in (os.getpgrp(), os.getsid(0)):
raise unittest.SkipTest("Neither the process group nor the session "
"are attached to /dev/tty")
def test_ioctl_immutable_buf(self):
# If this process has been put into the background, TIOCGPGRP returns
# the session ID instead of the process group id.
ids = (os.getpgrp(), os.getsid(0))
with open("/dev/tty", "rb") as tty:
# string
buf = " "*8
r = fcntl.ioctl(tty, termios.TIOCGPGRP, buf)
self.assertIsInstance(r, bytes)
rpgrp = memoryview(r).cast('i')[0]
self.assertIn(rpgrp, ids)
# bytes
buf = b" "*8
r = fcntl.ioctl(tty, termios.TIOCGPGRP, buf)
self.assertIsInstance(r, bytes)
rpgrp = memoryview(r).cast('i')[0]
self.assertIn(rpgrp, ids)
# read-only buffer
r = fcntl.ioctl(tty, termios.TIOCGPGRP, memoryview(buf))
self.assertIsInstance(r, bytes)
rpgrp = memoryview(r).cast('i')[0]
self.assertIn(rpgrp, ids)
def test_ioctl_mutable_buf(self):
ids = (os.getpgrp(), os.getsid(0))
with open("/dev/tty", "rb") as tty:
buf = bytearray(b" "*8)
r = fcntl.ioctl(tty, termios.TIOCGPGRP, buf)
self.assertEqual(r, 0)
rpgrp = memoryview(buf).cast('i')[0]
self.assertIn(rpgrp, ids)
def test_ioctl_no_mutate_buf(self):
ids = (os.getpgrp(), os.getsid(0))
with open("/dev/tty", "rb") as tty:
buf = bytearray(b" "*8)
save_buf = bytes(buf)
r = fcntl.ioctl(tty, termios.TIOCGPGRP, buf, False)
self.assertEqual(bytes(buf), save_buf)
self.assertIsInstance(r, bytes)
rpgrp = memoryview(r).cast('i')[0]
self.assertIn(rpgrp, ids)
def _create_int_buf(self, nbytes=None):
buf = array.array('i')
intsize = buf.itemsize
# A fill value unlikely to be in `ids`
fill = -12345
if nbytes is not None:
# Extend the buffer so that it is exactly `nbytes` bytes long
buf.extend([fill] * (nbytes // intsize))
self.assertEqual(len(buf) * intsize, nbytes) # sanity check
else:
buf.append(fill)
return buf
def _check_ioctl_mutate_len(self, nbytes=None):
ids = (os.getpgrp(), os.getsid(0))
buf = self._create_int_buf(nbytes)
with open("/dev/tty", "rb") as tty:
r = fcntl.ioctl(tty, termios.TIOCGPGRP, buf)
rpgrp = buf[0]
self.assertEqual(r, 0)
self.assertIn(rpgrp, ids)
def _check_ioctl_not_mutate_len(self, nbytes=None):
ids = (os.getpgrp(), os.getsid(0))
buf = self._create_int_buf(nbytes)
save_buf = bytes(buf)
with open("/dev/tty", "rb") as tty:
r = fcntl.ioctl(tty, termios.TIOCGPGRP, buf, False)
self.assertIsInstance(r, bytes)
self.assertEqual(len(r), len(save_buf))
self.assertEqual(bytes(buf), save_buf)
rpgrp = array.array('i', r)[0]
rpgrp = memoryview(r).cast('i')[0]
self.assertIn(rpgrp, ids)
buf = bytes(buf)
with open("/dev/tty", "rb") as tty:
r = fcntl.ioctl(tty, termios.TIOCGPGRP, buf, True)
self.assertIsInstance(r, bytes)
self.assertEqual(len(r), len(save_buf))
self.assertEqual(buf, save_buf)
rpgrp = array.array('i', r)[0]
rpgrp = memoryview(r).cast('i')[0]
self.assertIn(rpgrp, ids)
def test_ioctl_mutate(self):
self._check_ioctl_mutate_len()
self._check_ioctl_not_mutate_len()
def test_ioctl_mutate_1024(self):
# Issue #9758: a mutable buffer of exactly 1024 bytes wouldn't be
# copied back after the system call.
self._check_ioctl_mutate_len(1024)
self._check_ioctl_not_mutate_len(1024)
def test_ioctl_mutate_2048(self):
# Test with a larger buffer, just for the record.
self._check_ioctl_mutate_len(2048)
self.assertRaises(ValueError, self._check_ioctl_not_mutate_len, 2048)
@unittest.skipUnless(hasattr(os, 'openpty'), "need os.openpty()")
class IoctlTestsPty(unittest.TestCase):
def setUp(self):
self.master_fd, self.slave_fd = os.openpty()
self.addCleanup(os.close, self.slave_fd)
self.addCleanup(os.close, self.master_fd)
@unittest.skipUnless(hasattr(termios, 'TCFLSH'), 'requires termios.TCFLSH')
def test_ioctl_clear_input_or_output(self):
wfd = self.slave_fd
rfd = self.master_fd
# The data is buffered in the input buffer on Linux, and in
# the output buffer on other platforms.
inbuf = sys.platform in ('linux', 'android')
os.write(wfd, b'abcdef')
self.assertEqual(os.read(rfd, 2), b'ab')
if inbuf:
# don't flush input
fcntl.ioctl(rfd, termios.TCFLSH, termios.TCOFLUSH)
else:
# don't flush output
fcntl.ioctl(wfd, termios.TCFLSH, termios.TCIFLUSH)
self.assertEqual(os.read(rfd, 2), b'cd')
if inbuf:
# flush input
fcntl.ioctl(rfd, termios.TCFLSH, termios.TCIFLUSH)
else:
# flush output
fcntl.ioctl(wfd, termios.TCFLSH, termios.TCOFLUSH)
os.write(wfd, b'ABCDEF')
self.assertEqual(os.read(rfd, 1024), b'ABCDEF')
@support.skip_android_selinux('tcflow')
@unittest.skipUnless(sys.platform in ('linux', 'android'), 'only works on Linux')
@unittest.skipUnless(hasattr(termios, 'TCXONC'), 'requires termios.TCXONC')
def test_ioctl_suspend_and_resume_output(self):
wfd = self.slave_fd
rfd = self.master_fd
write_suspended = threading.Event()
write_finished = threading.Event()
def writer():
os.write(wfd, b'abc')
self.assertTrue(write_suspended.wait(support.SHORT_TIMEOUT))
os.write(wfd, b'def')
write_finished.set()
with threading_helper.start_threads([threading.Thread(target=writer)]):
self.assertEqual(os.read(rfd, 3), b'abc')
try:
try:
fcntl.ioctl(wfd, termios.TCXONC, termios.TCOOFF)
finally:
write_suspended.set()
self.assertFalse(write_finished.wait(0.5),
'output was not suspended')
finally:
fcntl.ioctl(wfd, termios.TCXONC, termios.TCOON)
self.assertTrue(write_finished.wait(support.SHORT_TIMEOUT),
'output was not resumed')
self.assertEqual(os.read(rfd, 1024), b'def')
def test_ioctl_set_window_size(self):
# (rows, columns, xpixel, ypixel)
our_winsz = struct.pack("HHHH", 20, 40, 0, 0)
result = fcntl.ioctl(self.master_fd, termios.TIOCSWINSZ, our_winsz)
new_winsz = struct.unpack("HHHH", result)
self.assertEqual(new_winsz[:2], (20, 40))
if __name__ == "__main__":
unittest.main()
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