New submission from Fernando Pérez <[EMAIL PROTECTED]>: Curses sometimes fails to correctly initialize the terminal. Unfortunately I don't know how to reproduce the problem, it was reported multiple times by ipython users, but I have no idea what causes it. I finally found a workaround by making a termios call that at least restores terminal state (see attachment), but it's just a workaround, not a real fix.
The issue manifests itself as follows: at some point (I don't know why), a call to curses.initscr() doesn't actually set the terminal in the usual mode where input isn't accepted, but instead the terminal continues accepting normal input, issuing newlines, etc. The only sign that curses is active is that in a modern terminal, the scrollbar changes to fill the screen. After this, calling curses.endwin(), instead of restoring terminal state, leaves the terminal in the mode that typically initscr() would put it in: no input is displayed, printouts swallow end-of-line characters, etc. When this happened in ipython sessions, we'd just suggest users call !reset (the system command), which would restore terminal state. But the problem is obviously in curses itself, because once this problem appeared, running the attached script would always print 'False' for the state condition checked there. For now in IPython we have a workaround, but perhaps with this little description/example, someone who knows the curses code might be able to actually fix the real problem. If I find a reliable way to trigger the bug, I'll add comments here indicating so. ---------- components: Extension Modules files: cursesbug.py messages: 65626 nosy: fer_perez severity: normal status: open title: curses type: behavior versions: Python 2.5 Added file: http://bugs.python.org/file10059/cursesbug.py __________________________________ Tracker <[EMAIL PROTECTED]> <http://bugs.python.org/issue2657> __________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
