/* ARGSUSED */
static void
writeroob(int signum)
{
int mask;
if (!dosigwinch) {
/*
* Start tracking window size. It doesn't matter which
* order the next two are in, because we'll be unconditionally
* sending a size notification in a moment.
*/
(void) sigset(SIGWINCH, sigwinch);
dosigwinch = B_TRUE;
/*
* It would be bad if a SIGWINCH came in between the ioctl
* and sending the data. It could result in the SIGWINCH
* handler sending a good message, and then us sending an
* outdated or inconsistent message.
*
* Instead, if the change is made before the
* ioctl, the sigwinch handler will send a size message
* and we'll send another, identical, one. If the change
* is made after the ioctl, we'll send a message with the
* old value, and then the sigwinch handler will send
* a revised, correct one.
*/
mask = sigblock(sigmask(SIGWINCH));
if (ioctl(STDIN_FILENO, TIOCGWINSZ, &winsize) == 0)
sendwindow();
sigsetmask(mask);
}
}
/* ARGSUSED */
static void
writeroob(int signo __unused)
{
if (dosigwinch == 0) {
sendwindow();
(void)signal(SIGWINCH, sigwinch);
}
dosigwinch = 1;
}
/* ARGSUSED */
static void
sigwinch(int signum)
{
struct winsize ws;
if (dosigwinch && ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == 0 &&
memcmp(&winsize, &ws, sizeof (ws)) != 0) {
winsize = ws;
sendwindow();
}
}
/* ARGSUSED */
static void
sigwinch(int signo __unused)
{
struct winsize ws;
if (dosigwinch && get_window_size(0, &ws) == 0 &&
bcmp(&ws, &winsize, sizeof(ws))) {
winsize = ws;
sendwindow();
}
}
