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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: main.c,v 1.31 2021/10/23 11:22:48 mestre Exp $	*/
/*	$NetBSD: main.c,v 1.4 1995/04/27 21:22:25 mycroft Exp $	*/

/*-
 * Copyright (c) 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Ed James.
 *
 * 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.
 */

/*
 * Copyright (c) 1987 by Ed James, UC Berkeley.  All rights reserved.
 *
 * Copy permission is hereby granted provided that this notice is
 * retained on all partial or complete copies.
 *
 * For more info on this and all of my stuff, mail edjames@berkeley.edu.
 */

#include <err.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <time.h>
#include <unistd.h>

#include "extern.h"
#include "pathnames.h"

int
main(int argc, char *argv[])
{
	int			ch;
	int			f_usage = 0, f_list = 0, f_showscore = 0;
	int			f_printpath = 0;
	const char		*file = NULL;
	char			*seed;
	struct sigaction	sa;
	struct itimerval	itv;

	open_score_file();

	start_time = time(0);
	makenoise = 1;
	seed = NULL;

	while ((ch = getopt(argc, argv, "f:g:hlpqr:st")) != -1) {
		switch (ch) {
		case 'f':
		case 'g':
			file = optarg;
			break;
		case 'l':
			f_list = 1;
			break;
		case 'p':
			f_printpath = 1;
			break;
		case 'q':
			makenoise = 0;
			break;
		case 'r':
			seed = optarg;
			break;
		case 's':
		case 't':
			f_showscore = 1;
			break;
		case 'h':
		default:
			f_usage = 1;
			break;
		}
	}
	argc -= optind;
	argv += optind;

	if (argc > 0)
		f_usage = 1;

	if (seed != NULL)
		setseed(seed);

	if (f_usage)
		fprintf(stderr, 
		    "usage: %s [-lpqst] [-f game] [-g game] [-r seed]\n",
		    getprogname());
	if (f_showscore)
		log_score(1);
	if (f_list)
		list_games();
	if (f_printpath) {
		size_t	len;
		char	buf[256];

		strlcpy(buf, _PATH_GAMES, sizeof buf);
		len = strlen(buf);
		if (len != 0 && buf[len - 1] == '/')
			buf[len - 1] = '\0';
		puts(buf);
	}
		
	if (f_usage || f_showscore || f_list || f_printpath)
		return 0;

	if (file == NULL)
		file = default_game();
	else
		file = okay_game(file);

	if (file == NULL || read_file(file) < 0)
		return 1;

	setup_screen(sp);

	if (pledge("stdio rpath wpath cpath flock tty", NULL) == -1)
		err(1, "pledge");

	addplane();

	signal(SIGINT, quit);
	signal(SIGQUIT, quit);
	signal(SIGTSTP, SIG_IGN);
	signal(SIGSTOP, SIG_IGN);
	signal(SIGHUP, log_score_quit);
	signal(SIGTERM, log_score_quit);

	tcgetattr(fileno(stdin), &tty_start);
	tty_new = tty_start;
	tty_new.c_lflag &= ~(ICANON|ECHO);
	tty_new.c_iflag |= ICRNL;
	tty_new.c_cc[VMIN] = 1;
	tty_new.c_cc[VTIME] = 0;
	tcsetattr(fileno(stdin), TCSADRAIN, &tty_new);

	memset(&sa, 0, sizeof sa);
	sa.sa_handler = update;
	sigemptyset(&sa.sa_mask);
	sigaddset(&sa.sa_mask, SIGALRM);
	sigaddset(&sa.sa_mask, SIGINT);
	sa.sa_flags = 0;
	sigaction(SIGALRM, &sa, (struct sigaction *)0);

	itv.it_value.tv_sec = 0;
	itv.it_value.tv_usec = 1;
	itv.it_interval.tv_sec = sp->update_secs;
	itv.it_interval.tv_usec = 0;
	setitimer(ITIMER_REAL, &itv, NULL);

	for (;;) {
		if (getcommand() != 1)
			planewin();
		else {
			itv.it_value.tv_sec = 0;
			itv.it_value.tv_usec = 0;
			setitimer(ITIMER_REAL, &itv, NULL);

			update(0);

			itv.it_value.tv_sec = sp->update_secs;
			itv.it_value.tv_usec = 0;
			itv.it_interval.tv_sec = sp->update_secs;
			itv.it_interval.tv_usec = 0;
			setitimer(ITIMER_REAL, &itv, NULL);
		}
	}
}

int
read_file(const char *s)
{
	extern FILE	*yyin;
	int		retval;

	file = s;
	yyin = fopen(s, "r");
	if (yyin == NULL) {
		warn("fopen %s", s);
		return (-1);
	}
	retval = yyparse();
	fclose(yyin);

	if (retval != 0)
		return (-1);
	else
		return (0);
}

const char	*
default_game(void)
{
	FILE		*fp;
	static char	file[256];
	char		line[256], games[256];

	strlcpy(games, _PATH_GAMES, sizeof games);
	strlcat(games, GAMES, sizeof games);

	if ((fp = fopen(games, "r")) == NULL) {
		warn("fopen %s", games);
		return (NULL);
	}
	if (fgets(line, sizeof(line), fp) == NULL) {
		warnx("%s: no default game available", games);
		fclose(fp);
		return (NULL);
	}
	fclose(fp);

	line[strcspn(line, "\n")] = '\0';
	if (strlen(line) + strlen(_PATH_GAMES) >= sizeof(file)) {
		warnx("default game name too long");
		return (NULL);
	}
	strlcpy(file, _PATH_GAMES, sizeof file);
	strlcat(file, line, sizeof file);
	return (file);
}

const char	*
okay_game(const char *s)
{
	FILE		*fp;
	static char	file[256];
	const char	*ret = NULL;
	char		line[256], games[256];

	strlcpy(games, _PATH_GAMES, sizeof games);
	strlcat(games, GAMES, sizeof games);

	if ((fp = fopen(games, "r")) == NULL) {
		warn("fopen %s", games);
		return (NULL);
	}
	while (fgets(line, sizeof(line), fp) != NULL) {
		line[strcspn(line, "\n")] = '\0';
		if (strcmp(s, line) == 0) {
			if (strlen(line) + strlen(_PATH_GAMES) >= sizeof(file)) {
				warnx("game name too long");
				return (NULL);
			}
			strlcpy(file, _PATH_GAMES, sizeof file);
			strlcat(file, line, sizeof file);
			ret = file;
			break;
		}
	}
	fclose(fp);
	if (ret == NULL) {
		test_mode = 1;
		ret = s;
		fprintf(stderr, "%s: %s: game not found\n", games, s);
		fprintf(stderr, "Your score will not be logged.\n");
		sleep(2);	/* give the guy time to read it */
	}
	return (ret);
}

int
list_games(void)
{
	FILE		*fp;
	char		line[256], games[256];
	int		num_games = 0;

	strlcpy(games, _PATH_GAMES, sizeof games);
	strlcat(games, GAMES, sizeof games);

	if ((fp = fopen(games, "r")) == NULL) {
		warn("fopen %s", games);
		return (-1);
	}
	puts("available games:");
	while (fgets(line, sizeof(line), fp) != NULL) {
		line[strcspn(line, "\n")] = '\0';
		printf("	%s\n", line);
		num_games++;
	}
	fclose(fp);
	if (num_games == 0) {
		fprintf(stderr, "%s: no games available\n", games);
		return (-1);
	}
	return (0);
}