1 files changed, 32 insertions, 0 deletions
diff --git a/klippy/util.py b/klippy/util.py
new file mode 100644
index 000000000..caac827e0
--- /dev/null
+++ b/klippy/util.py
@@ -0,0 +1,32 @@
+# Low level unix utility functions
+#
+# Copyright (C) 2016  Kevin O'Connor <kevin@koconnor.net>
+#
+# 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