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https://github.com/python/cpython
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85 lines
2.8 KiB
Python
85 lines
2.8 KiB
Python
import array
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import unittest
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from test.support import get_attribute
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from test.support.import_helper import import_module
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import os, struct
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fcntl = import_module('fcntl')
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termios = import_module('termios')
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get_attribute(termios, 'TIOCGPGRP') #Can't run tests without this feature
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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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else:
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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, termios.TIOCGPGRP, " ")
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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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del tty, r, rpgrp
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try:
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import pty
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except ImportError:
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pty = None
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class IoctlTests(unittest.TestCase):
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def test_ioctl(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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r = fcntl.ioctl(tty, termios.TIOCGPGRP, " ")
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rpgrp = struct.unpack("i", r)[0]
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self.assertIn(rpgrp, ids)
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def _check_ioctl_mutate_len(self, nbytes=None):
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buf = array.array('i')
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intsize = buf.itemsize
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ids = (os.getpgrp(), os.getsid(0))
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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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with open("/dev/tty", "rb") as tty:
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r = fcntl.ioctl(tty, termios.TIOCGPGRP, buf, True)
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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 test_ioctl_mutate(self):
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self._check_ioctl_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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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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@unittest.skipIf(pty is None, 'pty module required')
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def test_ioctl_set_window_size(self):
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mfd, sfd = pty.openpty()
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try:
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# (rows, columns, xpixel, ypixel)
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our_winsz = struct.pack("HHHH", 20, 40, 0, 0)
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result = fcntl.ioctl(mfd, termios.TIOCSWINSZ, our_winsz)
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new_winsz = struct.unpack("HHHH", result)
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self.assertEqual(new_winsz[:2], (20, 40))
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finally:
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os.close(mfd)
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os.close(sfd)
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if __name__ == "__main__":
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unittest.main()
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