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c++ncurses

Getch() behavior when terminal is resized? (ncurses)

getch returns 410 when I resize terminal. Why does the getch interpret the resize as input? What's the 410? Is it a special symbol?

Code:

#include <curses.h>

int main() {
    initscr(); cbreak(); noecho();
    int x = getch();
    printw("%d", x);
    getch();
    endwin();

    return 0;
}

But when I use timeout I get ERR (i.e -1). Why does resizing when using the timeout lead to an error?

Code:

#include <curses.h>

int main() {
    initscr(); cbreak(); noecho(); timeout(10000);
    int x = getch();
    printw("%d", x);
    getch();
    endwin();

    return 0;

}
Solution 
  • /* curses.h */
#define KEY_RESIZE  0632        /* Terminal resize event */

    410 = 0632 (octal).

    As for your second question, that doesn't happen when I test on my machine. Are you perhaps running an old version of ncurses? There have been bugs around this. https://lists.gnu.org/archive/html/bug-ncurses/2002-01/msg00003.html