Function sidewaysintpr

tools/netstat/if.c:573–675

* Print a running summary of interface statistics. * Repeat display every interval seconds, showing statistics * collected over that interval. Assumes that interval is non-zero. * First line printed at top of screen is always cumulative. */

 * First line printed at top of screen is always cumulative.
 */
static void
sidewaysintpr(void)
{
	struct iftot ift[2], *new, *old;
	struct itimerval interval_it;
#ifndef FSTACK
	int oldmask, line;
#else
	int line;
	sigset_t oldmask;
#endif

	new = &ift[0];
	old = &ift[1];
	fill_iftot(old);

	(void)signal(SIGALRM, catchalarm);
	signalled = false;
	interval_it.it_interval.tv_sec = interval;
	interval_it.it_interval.tv_usec = 0;
	interval_it.it_value = interval_it.it_interval;
	setitimer(ITIMER_REAL, &interval_it, NULL);
	xo_open_list("interface-statistics");

banner:
	xo_emit("{T:/%17s} {T:/%14s} {T:/%16s}\n", "input",
	    interface != NULL ? interface : "(Total)", "output");
	xo_emit("{T:/%10s} {T:/%5s} {T:/%5s} {T:/%10s} {T:/%10s} {T:/%5s} "
	    "{T:/%10s} {T:/%5s}",
	    "packets", "errs", "idrops", "bytes", "packets", "errs", "bytes",
	    "colls");
	if (dflag)
		xo_emit(" {T:/%5.5s}", "drops");
	xo_emit("\n");
	xo_flush();
	line = 0;

loop:
	if ((noutputs != 0) && (--noutputs == 0)) {
		xo_close_list("interface-statistics");
		return;
	}
#ifndef FSTACK
	oldmask = sigblock(sigmask(SIGALRM));
	while (!signalled)
		sigpause(0);
	signalled = false;
	sigsetmask(oldmask);
#else
	sigset_t set;
	sigemptyset(&set);
	sigaddset(&set, SIGALRM);
	sigprocmask(SIG_BLOCK, &set, &oldmask);
	sigemptyset(&set);

	while (!signalled)
		sigsuspend(&set);
	signalled = false;