##################################################################### Modem stuffimport sys, os, stringimport termios, TERMIOSimport selectclass Modem:	def __init__(self, baud):		self.mf = open("/dev/ttyS0", "r+")		self.mfd = self.mf.fileno()		self.old = termios.tcgetattr(self.mfd)		new = termios.tcgetattr(self.mfd)		# Translate the baud rate		bd = getattr(TERMIOS, 'B' + str(baud))		# Input flags		new[0] = 0		# Output flags		new[1] = 0		# Control flags		new[2] = (new[2] & ~(TERMIOS.CSIZE | TERMIOS.PARENB)) \			| (TERMIOS.CS8 | TERMIOS.CRTSCTS | TERMIOS.CLOCAL)		# Local flags		new[3] = 0		new[4] = bd		# Set i/o speed		new[5] = bd		termios.tcsetattr(self.mfd, TERMIOS.TCSANOW, new)	def close(self):		termios.tcsetattr(self.mfd, TERMIOS.TCSADRAIN, self.old)		def interact(self):		while 1:			i, o, e = select.select([sys.stdin, self.mf], [], [])			if i[0] is sys.stdin:				line = sys.stdin.readline()[:-1]				if line == 'quit': return				self.mf.write(line + "\r\n")			elif i[0] is self.mf:				data = os.read(self.mfd, 1024)				# data = string.replace(data, "\r", "")				sys.stdout.write(data)				sys.stdout.flush()def test_modem():	modem = Modem(57600)	modem.interact()	modem.close()