#include <stdio.h>
#include <sys/ioctl.h>
#include <unistd.h>

int main(void) {
    struct winsize w;

    /* See: man 2 ioctl */
    /* See: man 2 TIOCGWINSZ */
    /* See: linux/fs/ioctl.c */
    /* See: linux/drivers/tty/tty_io.c (L: ~2709 and ~2359) */
    if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &w) == -1) {
        perror("ioctl");
        return 1;
    }

    printf("Rows (height): %d\n", w.ws_row);
    printf("Cols (width):  %d\n", w.ws_col);

    return 0;
}