Bugs item #893250, was opened at 2004-02-09 02:11
Message generated for change (Comment added) made by akuchling
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Category: Extension Modules
Group: Python 2.3
>Status: Closed
>Resolution: Wont Fix
Priority: 5
Private: No
Submitted By: J. David Lee (bogjohnson)
Assigned to: A.M. Kuchling (akuchling)
Summary: curses getkey() crash in raw mode
Initial Comment:
Using python 2.3.3 on gentoo I have the following problem:
When calling stdscr.getkey() in raw mode, the program
crashes on a terminal resize event. In cooked and
cbreak modes, the proper string is returned -
"KEY_RESIZE". This problem appeared after upgrading
from python 2.3.2, I believe. Below is a quick program
that exhibits this behavior on my machine.
#######################################################
#!/usr/bin/env python
import curses;
stdscr = curses.initscr();
curses.raw();
curses.noecho();
stdscr.keypad(1);
while(1):
stdscr.clear();
stdscr.addstr("Enter key: ");
c = stdscr.getkey();
if(c == 'q'):
break;
stdscr.clear();
stdscr.addstr('"' + c + '"\n\n');
stdscr.addstr("Press any key...");
stdscr.getkey();
curses.noraw();
curses.endwin();
#######################################################
A couple of other notes:
1) No exception is thrown (a try block doesn't catch it).
2) The behavior is the same using the interactive
interpreter.
3) The traceback is: File "./keyname", line 19, in ?
stdscr.getkey(); _curses.error: no input
----------------------------------------------------------------------
>Comment By: A.M. Kuchling (akuchling)
Date: 2006-11-07 09:32
Message:
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user_id=11375
After experimenting a bit with the attached test program, it
doesn't seem as if this is actually a bug in
the module; the ncurses docs themselves are vague on the
interaction between signals and a KEY_RESIZE. So I'll close
this bug, because it doesn't look like there's anything in
Python to fix.
----------------------------------------------------------------------
Comment By: J. David Lee (bogjohnson)
Date: 2004-04-20 01:21
Message:
Logged In: YES
user_id=971407
That Gentoo updated the ncurses library is quite possible.
Though the behavior is still incorrect as the documentation
says that getkey will return "KEY_RESIZE" on a terminal
resize event, and in fact it does in cooked and cbreak
modes, but throws an exception when in raw mode (though a
terminal resize isn't an exceptional circumstance). Also, a
program can't assume that an exception on getkey() is a
resize event because an actual exception might occur and
need to be dealt with.
For the present, though, the workaround is acceptable
because a real exception on getkey is very unlikely, as far
as I can see.
----------------------------------------------------------------------
Comment By: A.M. Kuchling (akuchling)
Date: 2004-04-19 08:45
Message:
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user_id=11375
1) and 3) are contradictory; 3 is certainly an exception
traceback.
When I try the test program on a Debian system, I get the
same error,
but a try:except: around the getkey() on line 19 lets the
program continue running.
Nothing in the Python curses module changed between 2.3.3
and 2.3.2. Did gentoo switch to a new revision of the
ncurses library, perhaps?
----------------------------------------------------------------------
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