upstream/ipython Files · IPython/utils/cursesimport.py

inputhook: disable CTRL+C when a hook is active....

inputhook: disable CTRL+C when a hook is active. On systems with 'readline', it's very likely to intercept a signal during a select() call. The default SIGINT handler will schedule a KeyboardInterrupt exception to be raised as soon as possible. If ctypes is used to install a Python callback for PyOS_InputHook, this will happen as soon as the bytecode execution starts, so even if the first instruction of the callback is a `try: ... except KeyboardInterrupt` clause, it's actually too late. As ctypes doesn't allow a Python callback to raise an exception, this ends up with IPython detecting an internal error... not pretty. We must therefore ignore the SIGINT signals until we are sure the exception handler is active, in the Python callback.

Brian Granger - - Load All Authors

File last commit:

r2498:3eae1372


                r4944:0fc80df3

Download file

             cursesimport.py
        
                    30 lines
            
             | 1.1 KiB
            
                | text/x-python
            
             |
                PythonLexer
            
             / IPython / utils / cursesimport.py
          
                    History
                
                 |
                  Annotation
                 | Raw
                 |Copy content
                 |Copy permalink

      # encoding: utf-8

      """

      See if we have curses.

      """

      #-----------------------------------------------------------------------------

      #  Copyright (C) 2008-2009  The IPython Development Team

      #

      #  Distributed under the terms of the BSD License.  The full license is in

      #  the file COPYING, distributed as part of this software.

      #-----------------------------------------------------------------------------

      #-----------------------------------------------------------------------------

      # Imports

      #-----------------------------------------------------------------------------

      #-----------------------------------------------------------------------------

      # Code

      #-----------------------------------------------------------------------------

      # Curses and termios are Unix-only modules

      try:

          import curses

          # We need termios as well, so if its import happens to raise, we bail on

          # using curses altogether.

          import termios

      except ImportError:

          use_curses = False

      else:

          # Curses on Solaris may not be complete, so we can't use it there

          use_curses = hasattr(curses,'initscr')

	Site-wide shortcuts
/	Use quick search box
g h	Goto home page
g g	Goto my private gists page
g G	Goto my public gists page
g 0-9	Goto bookmarked items from 0-9
n r	New repository page
n g	New gist page

	Repositories
g s	Goto summary page
g c	Goto changelog page
g f	Goto files page
g F	Goto files page with file search activated
g p	Goto pull requests page
g o	Goto repository settings
g O	Goto repository access permissions settings
t s	Toggle sidebar on some pages

				# encoding: utf-8
				"""
				See if we have curses.
				"""

				#-----------------------------------------------------------------------------
				# Copyright (C) 2008-2009 The IPython Development Team
				#
				# Distributed under the terms of the BSD License. The full license is in
				# the file COPYING, distributed as part of this software.
				#-----------------------------------------------------------------------------

				#-----------------------------------------------------------------------------
				# Imports
				#-----------------------------------------------------------------------------

				#-----------------------------------------------------------------------------
				# Code
				#-----------------------------------------------------------------------------

				# Curses and termios are Unix-only modules
				try:
				import curses
				# We need termios as well, so if its import happens to raise, we bail on
				# using curses altogether.
				import termios
				except ImportError:
				use_curses = False
				else:
				# Curses on Solaris may not be complete, so we can't use it there
				use_curses = hasattr(curses,'initscr')