[probably solved] ncurses ERR instead of KEY_RESIZE

If someone using something else than archlinux wants to build and test this for me:

gcc -c faith.c
gcc -o faith -lncurses faith.o
./faith

When you hit some random keys, it should display their (octal) keycodes. Escape will make it quit. But what happens when you resize the xterm? And what if you replace

if (inp == KEY_RESIZE || inp == ERR) faith_resize_screen();

by

if (inp == KEY_RESIZE) faith_resize_screen();

and then recompile?

#include <ncurses.h>

int main(void) {
  WINDOW * stdscr = initscr();
  int width, height;
  while (1) {
    getmaxyx(stdscr, height, width);
    mvprintw(0,0,"%d %d %o\n", height, width, getch());
    refresh();
  }
  return 0;
}

Even that simple program gets ERR (37777777777) when resizing, and the height and width don't change. Is there a problem with my ncurses, or am I doing something wrong?

I found out the ncurses in archlinux is compiled without --enable-sigwinch , but that's not the problem (I rebuilt ncurses with that configure option, and the problem is still there).

Writing my own SIGWINCH handler could be a solution, though.

I've just compiled the program on Gentoo. The output of gcc -v is:

Using built-in specs.
Target: i686-pc-linux-gnu
Configured with: /var/tmp/portage/gcc-4.1.1-r1/work/gcc-4.1.1/configure --prefix=/usr
--bindir=/usr/i686-pc-linux-gnu/gcc-bin/4.1.1 --includedir=/usr/lib/gcc/i686-pc-linux-gnu/4.1.1/include 
--datadir=/usr/share/gcc-data/i686-pc-linux-gnu/4.1.1 
--mandir=/usr/share/gcc-data/i686-pc-linux-gnu/4.1.1/man 
--infodir=/usr/share/gcc-data/i686-pc-linux-gnu/4.1.1/info 
--with-gxx-include-dir=/usr/lib/gcc/i686-pc-linux-gnu/4.1.1/include/g++-v4 --host=i686-pc-linux-gnu 
--build=i686-pc-linux-gnu --disable-altivec --enable-nls --without-included-gettext --with-system-zlib 
--disable-checking --disable-werror --disable-libunwind-exceptions --disable-multilib --disable-libmudflap 
--disable-libssp --disable-libgcj --enable-languages=c,c++,fortran --enable-shared --enable-threads=posix 
--enable-__cxa_atexit --enable-clocale=gnu
Thread model: posix
gcc version 4.1.1 (Gentoo 4.1.1-r1)

As for your questions:
with "if (inp == KEY_RESIZE || inp == ERR) faith_resize_screen();" I get the octal codes for the keys, but when I resize the xterm the ncurses window doesn't resize.

with "if (inp == KEY_RESIZE) faith_resize_screen();" I get the octal codes for the keys, and ERR when I resize the xterm, the ncurses window doesn't seem to resize.

dylunio

Then obviously I'm doing something (or forgetting to do it?) that makes the screen not resizable. I need to find an example somewhere...

from the manual page of resizeterm (which appears to be the default SIGWINCH handler in ncurses:

And guess what?

/home/taco/faith $ echo $LINES $COLUMNS
20 70

So the solution is to do almost the same for ERR as for KEY_RESIZE: fetch the screen size, and redraw the screen. The only difference is that it should be fetched from these environment variables instead of getmaxyx(). I guess I'll write a function faith_getmaxyx() to replace all the calls to getmaxyx().

By the way, I removed the original program from the attachment, because I don't want search engines to pick up my poor code .