gistfile1.h

int
keyboard_watcher_init(const char **keyboards)
{
    const char *keyboard = NULL;

    while ((keyboard = *(keyboards++)) != NULL) {
        int         fd;
        keyboard_t *kb;

        fd = open(keyboard, O_RDONLY | O_NONBLOCK);

        if (fd < 0) {
            fprintf(stderr, "[*] Unable to attach to %s: %s\n",
                    keyboard, strerror(errno));
            continue;
        }

        kb = calloc(sizeof(keyboard_t), 1);

        if (kb == NULL) {
            return(-1);
        }

        event_set(&kb->event, fd, EV_READ | EV_PERSIST,
                  (void *)process_keystroke, (void *)kb);
        event_add(&kb->event, 0);
    }

    return(0);
}