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if both stdout and stderr are redirected to a non-tty, pledge(2) will kill
ncurses applications, e.g.:

/usr/games/worms 2>&1 | cat

solve this by only calling pledge(2) after initscr(3) is set and done, or
whatever function that calls it. since pledge(2) is called later now the
promises might be reduced, but this a diff for another day.

found by naddy@ almost a year ago, discussed with him deraadt@ and tb@
ok tb@

/*	$OpenBSD: rain.c,v 1.22 2021/10/23 11:22:49 mestre Exp $	*/

/*
 * Copyright (c) 1980, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * rain 11/3/1980 EPS/CITHEP
 * cc rain.c -o rain -O -ltermlib
 */

#include <curses.h>
#include <err.h>
#include <signal.h>
#include <stdlib.h>
#include <termios.h>
#include <unistd.h>

volatile sig_atomic_t sig_caught = 0;

static void	onsig(int);


int
main(int argc, char *argv[])
{
	int x, y, j;
	long tcols, tlines;
	const char *errstr;
	struct termios term;
	struct timespec sleeptime;
	speed_t speed;
	time_t delay = 0;
	int ch;
	int xpos[5], ypos[5];

	/* set default delay based on terminal baud rate */
	if (tcgetattr(STDOUT_FILENO, &term) == 0 &&
	    (speed = cfgetospeed(&term)) > B9600)
		delay = (speed / B9600) - 1;

	while ((ch = getopt(argc, argv, "d:h")) != -1)
		switch(ch) {
		case 'd':
			delay = (time_t)strtonum(optarg, 0, 1000, &errstr);
			if (errstr)
			    errx(1, "delay (0-1000) is %s: %s", errstr, optarg);
			break;
		case 'h':
		default:
			(void)fprintf(stderr, "usage: rain [-d delay]\n");
			return 1;
		}

	/* Convert delay from ms -> ns */
	sleeptime.tv_sec = 0;
	sleeptime.tv_nsec = delay * 500000;
	timespecadd(&sleeptime, &sleeptime, &sleeptime);

	initscr();

	if (pledge("stdio tty", NULL) == -1)
		err(1, "pledge");

	tcols = COLS - 4;
	tlines = LINES - 4;

	(void)signal(SIGHUP, onsig);
	(void)signal(SIGINT, onsig);
	(void)signal(SIGQUIT, onsig);
	(void)signal(SIGSTOP, onsig);
	(void)signal(SIGTSTP, onsig);
	(void)signal(SIGTERM, onsig);
	
	curs_set(0);
	for (j = 4; j >= 0; --j) {
		xpos[j] = arc4random_uniform(tcols) + 2;
		ypos[j] = arc4random_uniform(tlines) + 2;
	}
	for (j = 0;;) {
		if (sig_caught) {
			endwin();
			return 0;
		}
		x = arc4random_uniform(tcols) + 2;
		y = arc4random_uniform(tlines) + 2;
		mvaddch(y, x, '.');
		mvaddch(ypos[j], xpos[j], 'o');
		if (!j--)
			j = 4;
		mvaddch(ypos[j], xpos[j], 'O');
		if (!j--)
			j = 4;
		mvaddch(ypos[j] - 1, xpos[j], '-');
		mvaddstr(ypos[j], xpos[j] - 1, "|.|");
		mvaddch(ypos[j] + 1, xpos[j], '-');
		if (!j--)
			j = 4;
		mvaddch(ypos[j] - 2, xpos[j], '-');
		mvaddstr(ypos[j] - 1, xpos[j] - 1, "/ \\");
		mvaddstr(ypos[j], xpos[j] - 2, "| O |");
		mvaddstr(ypos[j] + 1, xpos[j] - 1, "\\ /");
		mvaddch(ypos[j] + 2, xpos[j], '-');
		if (!j--)
			j = 4;
		mvaddch(ypos[j] - 2, xpos[j], ' ');
		mvaddstr(ypos[j] - 1, xpos[j] - 1, "   ");
		mvaddstr(ypos[j], xpos[j] - 2, "     ");
		mvaddstr(ypos[j] + 1, xpos[j] - 1, "   ");
		mvaddch(ypos[j] + 2, xpos[j], ' ');
		xpos[j] = x;
		ypos[j] = y;
		refresh();
		nanosleep(&sleeptime, NULL);
	}
}

static void
onsig(int dummy)
{
	sig_caught = 1;
}