From f582a36e4df16d5709943f7df17a900c8bcc12ab Mon Sep 17 00:00:00 2001 From: Kevin O'Connor Date: Wed, 25 May 2016 11:37:40 -0400 Subject: Initial commit of source code. Signed-off-by: Kevin O'Connor --- klippy/util.py | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 klippy/util.py (limited to 'klippy/util.py') diff --git a/klippy/util.py b/klippy/util.py new file mode 100644 index 00000000..caac827e --- /dev/null +++ b/klippy/util.py @@ -0,0 +1,32 @@ +# Low level unix utility functions +# +# Copyright (C) 2016 Kevin O'Connor +# +# This file may be distributed under the terms of the GNU GPLv3 license. + +import os, pty, fcntl, termios, signal + +# Return the SIGINT interrupt handler back to the OS default +def fix_sigint(): + signal.signal(signal.SIGINT, signal.SIG_DFL) +fix_sigint() + +# Set a file-descriptor as non-blocking +def set_nonblock(fd): + fcntl.fcntl(fd, fcntl.F_SETFL + , fcntl.fcntl(fd, fcntl.F_GETFL) | os.O_NONBLOCK) + +# Support for creating a pseudo-tty for emulating a serial port +def create_pty(ptyname): + mfd, sfd = pty.openpty() + try: + os.unlink(ptyname) + except os.error: + pass + os.symlink(os.ttyname(sfd), ptyname) + fcntl.fcntl(mfd, fcntl.F_SETFL + , fcntl.fcntl(mfd, fcntl.F_GETFL) | os.O_NONBLOCK) + old = termios.tcgetattr(mfd) + old[3] = old[3] & ~termios.ECHO + termios.tcsetattr(mfd, termios.TCSADRAIN, old) + return mfd -- cgit v1.2.3-70-g09d2