mirror of https://github.com/python/cpython.git
223 lines
8.4 KiB
Python
223 lines
8.4 KiB
Python
import array
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import os
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import struct
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import sys
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import threading
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import unittest
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from test import support
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from test.support import os_helper, threading_helper
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from test.support.import_helper import import_module
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fcntl = import_module('fcntl')
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termios = import_module('termios')
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class IoctlTestsTty(unittest.TestCase):
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@classmethod
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def setUpClass(cls):
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TIOCGPGRP = support.get_attribute(termios, 'TIOCGPGRP')
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try:
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tty = open("/dev/tty", "rb")
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except OSError:
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raise unittest.SkipTest("Unable to open /dev/tty")
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with tty:
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# Skip if another process is in foreground
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r = fcntl.ioctl(tty, TIOCGPGRP, struct.pack("i", 0))
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rpgrp = struct.unpack("i", r)[0]
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if rpgrp not in (os.getpgrp(), os.getsid(0)):
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raise unittest.SkipTest("Neither the process group nor the session "
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"are attached to /dev/tty")
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def test_ioctl_immutable_buf(self):
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# If this process has been put into the background, TIOCGPGRP returns
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# the session ID instead of the process group id.
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ids = (os.getpgrp(), os.getsid(0))
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with open("/dev/tty", "rb") as tty:
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# string
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buf = " "*8
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r = fcntl.ioctl(tty, termios.TIOCGPGRP, buf)
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self.assertIsInstance(r, bytes)
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rpgrp = memoryview(r).cast('i')[0]
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self.assertIn(rpgrp, ids)
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# bytes
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buf = b" "*8
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r = fcntl.ioctl(tty, termios.TIOCGPGRP, buf)
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self.assertIsInstance(r, bytes)
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rpgrp = memoryview(r).cast('i')[0]
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self.assertIn(rpgrp, ids)
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# read-only buffer
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r = fcntl.ioctl(tty, termios.TIOCGPGRP, memoryview(buf))
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self.assertIsInstance(r, bytes)
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rpgrp = memoryview(r).cast('i')[0]
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self.assertIn(rpgrp, ids)
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def test_ioctl_mutable_buf(self):
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ids = (os.getpgrp(), os.getsid(0))
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with open("/dev/tty", "rb") as tty:
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buf = bytearray(b" "*8)
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r = fcntl.ioctl(tty, termios.TIOCGPGRP, buf)
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self.assertEqual(r, 0)
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rpgrp = memoryview(buf).cast('i')[0]
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self.assertIn(rpgrp, ids)
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def test_ioctl_no_mutate_buf(self):
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ids = (os.getpgrp(), os.getsid(0))
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with open("/dev/tty", "rb") as tty:
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buf = bytearray(b" "*8)
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save_buf = bytes(buf)
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r = fcntl.ioctl(tty, termios.TIOCGPGRP, buf, False)
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self.assertEqual(bytes(buf), save_buf)
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self.assertIsInstance(r, bytes)
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rpgrp = memoryview(r).cast('i')[0]
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self.assertIn(rpgrp, ids)
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def _create_int_buf(self, nbytes=None):
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buf = array.array('i')
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intsize = buf.itemsize
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# A fill value unlikely to be in `ids`
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fill = -12345
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if nbytes is not None:
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# Extend the buffer so that it is exactly `nbytes` bytes long
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buf.extend([fill] * (nbytes // intsize))
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self.assertEqual(len(buf) * intsize, nbytes) # sanity check
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else:
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buf.append(fill)
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return buf
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def _check_ioctl_mutate_len(self, nbytes=None):
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ids = (os.getpgrp(), os.getsid(0))
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buf = self._create_int_buf(nbytes)
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with open("/dev/tty", "rb") as tty:
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r = fcntl.ioctl(tty, termios.TIOCGPGRP, buf)
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rpgrp = buf[0]
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self.assertEqual(r, 0)
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self.assertIn(rpgrp, ids)
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def _check_ioctl_not_mutate_len(self, nbytes=None):
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ids = (os.getpgrp(), os.getsid(0))
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buf = self._create_int_buf(nbytes)
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save_buf = bytes(buf)
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with open("/dev/tty", "rb") as tty:
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r = fcntl.ioctl(tty, termios.TIOCGPGRP, buf, False)
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self.assertIsInstance(r, bytes)
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self.assertEqual(len(r), len(save_buf))
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self.assertEqual(bytes(buf), save_buf)
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rpgrp = array.array('i', r)[0]
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rpgrp = memoryview(r).cast('i')[0]
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self.assertIn(rpgrp, ids)
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buf = bytes(buf)
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with open("/dev/tty", "rb") as tty:
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r = fcntl.ioctl(tty, termios.TIOCGPGRP, buf, True)
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self.assertIsInstance(r, bytes)
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self.assertEqual(len(r), len(save_buf))
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self.assertEqual(buf, save_buf)
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rpgrp = array.array('i', r)[0]
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rpgrp = memoryview(r).cast('i')[0]
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self.assertIn(rpgrp, ids)
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def test_ioctl_mutate(self):
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self._check_ioctl_mutate_len()
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self._check_ioctl_not_mutate_len()
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def test_ioctl_mutate_1024(self):
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# Issue #9758: a mutable buffer of exactly 1024 bytes wouldn't be
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# copied back after the system call.
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self._check_ioctl_mutate_len(1024)
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self._check_ioctl_not_mutate_len(1024)
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def test_ioctl_mutate_2048(self):
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# Test with a larger buffer, just for the record.
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self._check_ioctl_mutate_len(2048)
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self.assertRaises(ValueError, self._check_ioctl_not_mutate_len, 2048)
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@unittest.skipUnless(hasattr(os, 'openpty'), "need os.openpty()")
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class IoctlTestsPty(unittest.TestCase):
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def setUp(self):
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self.master_fd, self.slave_fd = os.openpty()
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self.addCleanup(os.close, self.slave_fd)
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self.addCleanup(os.close, self.master_fd)
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@unittest.skipUnless(hasattr(termios, 'TCFLSH'), 'requires termios.TCFLSH')
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def test_ioctl_clear_input_or_output(self):
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wfd = self.slave_fd
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rfd = self.master_fd
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# The data is buffered in the input buffer on Linux, and in
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# the output buffer on other platforms.
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inbuf = sys.platform in ('linux', 'android')
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os.write(wfd, b'abcdef')
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self.assertEqual(os.read(rfd, 2), b'ab')
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if inbuf:
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# don't flush input
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fcntl.ioctl(rfd, termios.TCFLSH, termios.TCOFLUSH)
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else:
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# don't flush output
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fcntl.ioctl(wfd, termios.TCFLSH, termios.TCIFLUSH)
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self.assertEqual(os.read(rfd, 2), b'cd')
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if inbuf:
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# flush input
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fcntl.ioctl(rfd, termios.TCFLSH, termios.TCIFLUSH)
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else:
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# flush output
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fcntl.ioctl(wfd, termios.TCFLSH, termios.TCOFLUSH)
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os.write(wfd, b'ABCDEF')
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self.assertEqual(os.read(rfd, 1024), b'ABCDEF')
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@unittest.skipUnless(sys.platform == 'linux', 'only works on Linux')
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@unittest.skipUnless(hasattr(termios, 'TCXONC'), 'requires termios.TCXONC')
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def test_ioctl_suspend_and_resume_output(self):
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wfd = self.slave_fd
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rfd = self.master_fd
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write_suspended = threading.Event()
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write_finished = threading.Event()
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def writer():
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os.write(wfd, b'abc')
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self.assertTrue(write_suspended.wait(support.SHORT_TIMEOUT))
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os.write(wfd, b'def')
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write_finished.set()
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with threading_helper.start_threads([threading.Thread(target=writer)]):
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self.assertEqual(os.read(rfd, 3), b'abc')
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try:
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try:
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fcntl.ioctl(wfd, termios.TCXONC, termios.TCOOFF)
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finally:
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write_suspended.set()
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self.assertFalse(write_finished.wait(0.5),
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'output was not suspended')
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finally:
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fcntl.ioctl(wfd, termios.TCXONC, termios.TCOON)
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self.assertTrue(write_finished.wait(support.SHORT_TIMEOUT),
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'output was not resumed')
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self.assertEqual(os.read(rfd, 1024), b'def')
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def test_ioctl_signed_unsigned_code_param(self):
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if termios.TIOCSWINSZ < 0:
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set_winsz_opcode_maybe_neg = termios.TIOCSWINSZ
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set_winsz_opcode_pos = termios.TIOCSWINSZ & 0xffffffff
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else:
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set_winsz_opcode_pos = termios.TIOCSWINSZ
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set_winsz_opcode_maybe_neg, = struct.unpack("i",
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struct.pack("I", termios.TIOCSWINSZ))
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our_winsz = struct.pack("HHHH",80,25,0,0)
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# test both with a positive and potentially negative ioctl code
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new_winsz = fcntl.ioctl(self.master_fd, set_winsz_opcode_pos, our_winsz)
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new_winsz = fcntl.ioctl(self.master_fd, set_winsz_opcode_maybe_neg, our_winsz)
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@unittest.skipUnless(hasattr(fcntl, 'FICLONE'), 'need fcntl.FICLONE')
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def test_bad_fd(self):
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# gh-134744: Test error handling
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fd = os_helper.make_bad_fd()
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with self.assertRaises(OSError):
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fcntl.ioctl(fd, fcntl.FICLONE, fd)
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with self.assertRaises(OSError):
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fcntl.ioctl(fd, fcntl.FICLONE, b'\0' * 1024)
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if __name__ == "__main__":
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unittest.main()
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