signals interrupting wgetch

[John Gruenenfelder]

I seem to be having a problem with signals interrupting my call to wgetnstr
(which uses wgetch).  According to the man page for wgetch:

 "Under the ncurses implementation, handled signals never interrupt getch."

Until today, this was the case.  Today I updated the kernel from 2.6.11 to
2.6.12.  This is on a Debian Sid (current) machine.

The signal in question is SIGALRM which is generated every two seconds.
When the signal occurs, wgetnstr returns -1.  Checking errno (via perror), the
error is:
  "Interrupted system call"

By changing part of my code, I could do with out the timer which generates
SIGALRM and just poll the clock, but I'd like to know why the behavior changed
or if perhaps I am doing something wrong.

For reference, the extent of my ncurses configuration is:

  initscr();
  cbreak();
  nonl();
  keypad(stdscr, TRUE);
  main_win = newwin(LINES - 1, COLS, 0, 0);
  scrollok(main_win, TRUE);

And then I proceed to start reading/writing main_win.

Thanks for any help!


-- 
--John Gruenenfelder    Research Assistant, Steward Observatory, U of Arizona
                        address@hidden
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