window-size-changed.c

// window-size-changed.c: Demo program to handle window changed events
//
// Ben Cohen, July 2022.
//

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

int changed = 0;

void handler(int i)
{
    changed = 1;
}

int main (int argc, char **argv)
{
    signal(SIGWINCH, handler);

    while (1)
    {
        usleep(1000);
        if (changed)
        {
            changed = 0;
            
            struct winsize terminal_size;
            ioctl(STDOUT_FILENO, TIOCGWINSZ, &terminal_size);
            
            printf ("rows %d\n", terminal_size.ws_row);
            printf ("columns %d\n", terminal_size.ws_col);
            printf ("x pixels %d\n", terminal_size.ws_xpixel);
            printf ("y pixels %d\n", terminal_size.ws_ypixel);
        }
    }
}