import array import unittest from test.support import import_module, get_attribute import os, struct fcntl = import_module('fcntl') termios = import_module('termios') get_attribute(termios, 'TIOCGPGRP') #Can't run tests without this feature try: tty = open("/dev/tty", "rb") except OSError: raise unittest.SkipTest("Unable to open /dev/tty") else: with tty: # Skip if another process is in foreground r = fcntl.ioctl(tty, termios.TIOCGPGRP, " ") 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") del tty, r, rpgrp try: import pty except ImportError: pty = None class IoctlTests(unittest.TestCase): def test_ioctl(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: r = fcntl.ioctl(tty, termios.TIOCGPGRP, " ") rpgrp = struct.unpack("i", r)[0] self.assertIn(rpgrp, ids) def _check_ioctl_mutate_len(self, nbytes=None): buf = array.array('i') intsize = buf.itemsize ids = (os.getpgrp(), os.getsid(0)) # 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) with open("/dev/tty", "rb") as tty: r = fcntl.ioctl(tty, termios.TIOCGPGRP, buf, True) rpgrp = buf[0] self.assertEqual(r, 0) self.assertIn(rpgrp, ids) def test_ioctl_mutate(self): self._check_ioctl_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) def test_ioctl_mutate_2048(self): # Test with a larger buffer, just for the record. self._check_ioctl_mutate_len(2048) def test_ioctl_signed_unsigned_code_param(self): if not pty: raise unittest.SkipTest('pty module required') mfd, sfd = pty.openpty() try: if termios.TIOCSWINSZ < 0: set_winsz_opcode_maybe_neg = termios.TIOCSWINSZ set_winsz_opcode_pos = termios.TIOCSWINSZ & 0xffffffff else: set_winsz_opcode_pos = termios.TIOCSWINSZ set_winsz_opcode_maybe_neg, = struct.unpack("i", struct.pack("I", termios.TIOCSWINSZ)) our_winsz = struct.pack("HHHH",80,25,0,0) # test both with a positive and potentially negative ioctl code new_winsz = fcntl.ioctl(mfd, set_winsz_opcode_pos, our_winsz) new_winsz = fcntl.ioctl(mfd, set_winsz_opcode_maybe_neg, our_winsz) finally: os.close(mfd) os.close(sfd) if __name__ == "__main__": unittest.main()