[unix-history] / usr / src / old / rogue / machdep.c

/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1980 Regents of the University of California.\n\
 All rights reserved.\n";
#endif not lint

#ifndef lint
static char sccsid[] = "@(#)machdep.c	5.1 (Berkeley) %G%";
#endif not lint

/*
 * Various installation dependent routines
 *
 * $Revision: 1.7 $, $Date: 85/04/05 11:33:30 $
 */

/*
 * The various tuneable defines are:
 *
 *	SCOREFILE	Where/if the score file should live.
 *	ALLSCORES	Score file is top ten scores, not top ten
 *			players.  This is only useful when only a few
 *			people will be playing; otherwise the score file
 *			gets hogged by just a few people.
 *	NUMSCORES	Number of scores in the score file (default 10).
 *	NUMNAME		String version of NUMSCORES (first character
 *			should be capitalized) (default "Ten").
 *	MAXLOAD		What (if any) the maximum load average should be
 *			when people are playing.
 *		LOADAV		Should it use it's own routine to get
 *				the load average?
 *		NAMELIST	If so, where does the system namelist
 *				hide?
 *	MAXUSERS	What (if any) the maximum user count should be
 *			when people are playing.  If defined, then
 *		UCOUNT		Should it use it's own routine to count
 *				users?
 *		UTMP		If so, where does the user list hide?
 *	CHECKTIME	How often/if it should check during the game
 *			for high load average.
 *	WARNTIME	How much time between warnings when load gets
 *			too high (if not defined, it is the same as
 *			CHECKTIME).
 */

# include	<curses.h>
# include	"extern.h"
# include	<signal.h>
# include	<sys/types.h>
# include	<sys/stat.h>
# include	<sys/file.h>

# ifdef	SCOREFILE

# ifndef	LOCK_EX
static char	*Lockfile = "/tmp/.fredlock";
# endif

# ifndef	NUMSCORES
# 	define	NUMSCORES	10
# 	define	NUMNAME		"Ten"
# endif		NUMSCORES

unsigned int	Numscores = NUMSCORES;

char		*Numname = NUMNAME;

# ifdef ALLSCORES
bool	Allscore = TRUE;
# else	ALLSCORES
bool	Allscore = FALSE;
# endif ALLSCORES

# endif	SCOREFILE

# ifdef	CHECKTIME
static int	Num_checks;	/* times we've gone over in checkout() */

# ifndef WARNTIME
# define	WARNTIME	CHECKTIME
# endif
# endif	CHECKTIME

/*
 * init_check:
 *	Check out too see if it is proper to play the game now
 */
init_check()
{
# if	defined(MAXLOAD) || defined(MAXUSERS)
	if (too_much()) {
		printf("Sorry, %s, but the system is too loaded now.\n",
		       Whoami);
		printf("Try again later.  Meanwhile, why not enjoy a%s %s?\n",
		       vowelstr(Fruit), Fruit);
		if (author())
			printf("However, since you're a good guy, it's up to you\n");
		else
			exit(1);
	}
# endif	defined(MAXLOAD) || defined(MAXUSERS)
}

/*
 * open_score:
 *	Open up the score file for future use, and then
 *	setuid(getuid()) in case we are running setuid.
 */
open_score()
{
# ifdef SCOREFILE
	Fd = open(SCOREFILE, 2);
# else	SCOREFILE
	Fd = -1;
# endif	SCOREFILE
	setuid(getuid());
	setgid(getgid());
}

/*
 * setup:
 *	Get starting setup for all games
 */
setup()
{
	extern int	auto_save(), quit(), endit(), tstp();
# ifdef CHECKTIME
	extern int 	heckout();
# endif	CHECKTIME

	signal(SIGHUP, auto_save);
# ifndef DUMP
	signal(SIGILL, auto_save);
	signal(SIGTRAP, auto_save);
	signal(SIGIOT, auto_save);
	signal(SIGEMT, auto_save);
	signal(SIGFPE, auto_save);
	signal(SIGBUS, auto_save);
	signal(SIGSEGV, auto_save);
	signal(SIGSYS, auto_save);
	signal(SIGTERM, auto_save);
# endif	DUMP

	signal(SIGINT, quit);
# ifndef DUMP
	signal(SIGQUIT, endit);
# endif	DUMP
# ifdef CHECKTIME
	signal(SIGALRM, checkout);
	alarm(CHECKTIME * 60);
	Num_checks = 0;
# endif	CHECKTIME
	crmode();				/* Cbreak mode */
	noecho();				/* Echo off */
	nonl();
# ifdef TIOCGLTC
	getltchars();			/* get the local tty chars */
# endif	TIOCGLTC
}

/*
 * getltchars:
 *	Get the local tty chars for later use
 */
getltchars()
{
# ifdef TIOCGLTC
	ioctl(1, TIOCGLTC, &Ltc);
	Got_ltc = TRUE;
	Orig_dsusp = Ltc.t_dsuspc;
	Ltc.t_dsuspc = Ltc.t_suspc;
	ioctl(1, TIOCSLTC, &Ltc);
# endif	TIOCGLTC
}

/*
 * start_score:
 *	Start the scoring sequence
 */
start_score()
{
# ifdef CHECKTIME
	signal(SIGALRM, SIG_IGN);	/* NOSTRICT */
# endif	CHECKTIME
}

/*
 * symlink:
 *	See if the file has a symbolic link
 */
symlink(sp)
char	*sp;
{
# ifdef S_IFLNK
	struct stat sbuf2;

	if (lstat(sp, &sbuf2) < 0)
		return FALSE;
	else
		return ((sbuf2.st_mode & S_IFMT) != S_IFREG);
# else	S_IFLNK
	return FALSE;
# endif	S_IFLNK
}

# if	defined(MAXLOAD) || defined(MAXUSERS)
/*
 * too_much:
 *	See if the system is being used too much for this game
 */
too_much()
{
# ifdef MAXLOAD
	double		avec[3];
# endif	MAXLOAD
# ifdef	MAXUSERS
	register int	cnt;
# endif	MAXUSERS

# ifdef MAXLOAD
	loadav(avec);
	if (avec[1] > MAXLOAD)
		return TRUE;
# endif	MAXLOAD
# ifdef MAXUSERS
	if (ucount() > MAXUSERS)
		return TRUE;
# endif	MAXUSERS
	return FALSE;
}

/*
 * author:
 *	See if a user is an author of the program
 */
author()
{
# ifdef MASTER
	if (Wizard)
		return TRUE;
# endif	MASTER
	switch (getuid())
	{
	  case -1:
		return TRUE;
	  default:
		return FALSE;
	}
}
# endif	defined(MAXLOAD) || defined(MAXUSERS)

# ifdef	CHECKTIME
/*
 * checkout:
 *	Check each CHECKTIME seconds to see if the load is too high
 */
checkout()
{
	int		checktime;
	static char	*msgs[] = {
		"The load is too high to be playing.  Please leave in %.2f minutes",
		"Please save your game.  You have %.2f minutes",
		"Last warning.  You have %.2f minutes to leave",
	};

	signal(SIGALRM, checkout);
	if (too_much()) {
		if (author()) {
			Num_checks = 1;
			chmsg("The load is rather high, O exaulted one");
		}
		else if (Num_checks++ == 3)
			fatal("Sorry.  You took too long.  You are dead\n");
		checktime = (WARNTIME * 60) / Num_checks;
		alarm(checktime);
		chmsg(msgs[Num_checks - 1], ((double) checktime / 60.0));
	}
	else {
		if (Num_checks) {
			Num_checks = 0;
			chmsg("The load has dropped back down.  You have a reprieve");
		}
		alarm(CHECKTIME * 60);
	}
}

/*
 * chmsg:
 *	checkout()'s version of msg.  If we are in the middle of a
 *	shell, do a printf instead of a msg to avoid the refresh.
 */
/* VARARGS1 */
chmsg(fmt, arg)
char	*fmt;
int	arg;
{
	if (!In_shell)
		msg(fmt, arg);
	else {
		printf(fmt, arg);
		putchar('\n');
		fflush(stdout);
	}
}
# endif	defined(MAXLOAD) || defined(MAXUSERS)

# ifdef	LOADAV
/*
 * loadav:
 *	Looking up load average in core (for system where the loadav()
 *	system call isn't defined
 */

# include	<nlist.h>

struct nlist	avenrun = {
	    "_avenrun"
};

# ifndef	NAMELIST
# define	NAMELIST	"/vmunix"
# endif

loadav(avg)
register double	*avg;
{
	register int	kmem;

	if ((kmem = open("/dev/kmem", 0)) < 0)
		goto bad;
	nlist(NAMELIST, &avenrun);
	if (avenrun.n_type == 0) {
		close(kmem);
		bad:
		avg[0] = 0.0;
		avg[1] = 0.0;
		avg[2] = 0.0;
		return;
	}

	lseek(kmem, (long) avenrun.n_value, 0);
	read(kmem, (char *) avg, 3 * sizeof (double));
	close(kmem);
}
# endif	LOADAV

# ifdef UCOUNT
/*
 * ucount:
 *	Count number of users on the system
 */
# include	<utmp.h>

struct utmp	buf;

ucount()
{
	register struct utmp	*up;
	register FILE		*utmp;
	register int		count;

	if ((utmp = fopen(UTMP, "r")) == NULL)
		return 0;

	up = &buf;
	count = 0;

	while (fread(up, 1, sizeof (*up), utmp) > 0)
		if (buf.ut_name[0] != '\0')
			count++;
	fclose(utmp);
	return count;
}
# endif	UCOUNT

/*
 * lock_sc:
 *	lock the score file.  If it takes too long, ask the user if
 *	they care to wait.  Return TRUE if the lock is successful.
 */
lock_sc()
{
# ifdef SCOREFILE
# ifdef	LOCK_EX
	return (flock(Fd, LOCK_EX) >= 0);
# else	LOCK_EX
	register int		cnt;
	static struct stat	sbuf;

over:
	close(8);	/* just in case there are no files left */
	if (creat(Lockfile, 0000) >= 0)
		return TRUE;
	for (cnt = 0; cnt < 5; cnt++) {
		sleep(1);
		if (creat(Lockfile, 0000) >= 0)
			return TRUE;
	}
	if (stat(Lockfile, &sbuf) < 0) {
		creat(Lockfile, 0000);
		return TRUE;
	}
	if (time(NULL) - sbuf.st_mtime > 10) {
		if (unlink(Lockfile) < 0)
			return FALSE;
		goto over;
	}
	else {
		printf("The score file is very busy.  Do you want to wait longer\n");
		printf("for it to become free so your score can get posted?\n");
		printf("If so, type \"y\"\n");
		fgets(Prbuf, MAXSTR, stdin);
		if (Prbuf[0] == 'y')
			for (;;) {
				if (creat(Lockfile, 0000) >= 0)
					return TRUE;
				if (stat(Lockfile, &sbuf) < 0) {
					creat(Lockfile, 0000);
					return TRUE;
				}
				if (time(NULL) - sbuf.st_mtime > 10)
					if (unlink(Lockfile) < 0)
						return FALSE;
				sleep(1);
			}
		else
			return FALSE;
	}
# endif	LOCK_EX
# endif	SCOREFILE
}

/*
 * unlock_sc:
 *	Unlock the score file
 */
unlock_sc()
{
# ifdef SCOREFILE
# ifdef	LOCK_EX
	flock(Fd, LOCK_UN);
#else
	unlink(Lockfile);
# endif
# endif
}
Commit	Line	Data
e3325aaf KM	1	/*
	2	* Copyright (c) 1980 Regents of the University of California.
	3	* All rights reserved. The Berkeley software License Agreement
	4	* specifies the terms and conditions for redistribution.
	5	*/
	6
	7	#ifndef lint
	8	char copyright[] =
	9	"@(#) Copyright (c) 1980 Regents of the University of California.\n\
	10	All rights reserved.\n";
	11	#endif not lint
	12
	13	#ifndef lint
	14	static char sccsid[] = "@(#)machdep.c 5.1 (Berkeley) %G%";
	15	#endif not lint
	16
7a6f3a77 KA	17	/*
	18	* Various installation dependent routines
	19	*
	20	* $Revision: 1.7 $, $Date: 85/04/05 11:33:30 $
	21	*/
	22
	23	/*
	24	* The various tuneable defines are:
	25	*
	26	* SCOREFILE Where/if the score file should live.
	27	* ALLSCORES Score file is top ten scores, not top ten
	28	* players. This is only useful when only a few
	29	* people will be playing; otherwise the score file
	30	* gets hogged by just a few people.
	31	* NUMSCORES Number of scores in the score file (default 10).
	32	* NUMNAME String version of NUMSCORES (first character
	33	* should be capitalized) (default "Ten").
	34	* MAXLOAD What (if any) the maximum load average should be
	35	* when people are playing.
	36	* LOADAV Should it use it's own routine to get
	37	* the load average?
	38	* NAMELIST If so, where does the system namelist
	39	* hide?
	40	* MAXUSERS What (if any) the maximum user count should be
	41	* when people are playing. If defined, then
	42	* UCOUNT Should it use it's own routine to count
	43	* users?
	44	* UTMP If so, where does the user list hide?
	45	* CHECKTIME How often/if it should check during the game
	46	* for high load average.
	47	* WARNTIME How much time between warnings when load gets
	48	* too high (if not defined, it is the same as
	49	* CHECKTIME).
	50	*/
	51
	52	# include <curses.h>
	53	# include "extern.h"
	54	# include <signal.h>
	55	# include <sys/types.h>
	56	# include <sys/stat.h>
	57	# include <sys/file.h>
	58
	59	# ifdef SCOREFILE
	60
	61	# ifndef LOCK_EX
	62	static char *Lockfile = "/tmp/.fredlock";
	63	# endif
	64
	65	# ifndef NUMSCORES
	66	# define NUMSCORES 10
	67	# define NUMNAME "Ten"
	68	# endif NUMSCORES
	69
	70	unsigned int Numscores = NUMSCORES;
	71
	72	char *Numname = NUMNAME;
	73
	74	# ifdef ALLSCORES
	75	bool Allscore = TRUE;
	76	# else ALLSCORES
	77	bool Allscore = FALSE;
	78	# endif ALLSCORES
	79
	80	# endif SCOREFILE
81
82	# ifdef CHECKTIME
83	static int Num_checks; /* times we've gone over in checkout() */
84
85	# ifndef WARNTIME
86	# define WARNTIME CHECKTIME
87	# endif
88	# endif CHECKTIME
89
90	/*
91	* init_check:
92	* Check out too see if it is proper to play the game now
93	*/
94	init_check()
95	{
96	# if defined(MAXLOAD) \|\| defined(MAXUSERS)
97	if (too_much()) {
98	printf("Sorry, %s, but the system is too loaded now.\n",
99	Whoami);
100	printf("Try again later. Meanwhile, why not enjoy a%s %s?\n",
101	vowelstr(Fruit), Fruit);
102	if (author())
103	printf("However, since you're a good guy, it's up to you\n");
104	else
105	exit(1);
106	}
107	# endif defined(MAXLOAD) \|\| defined(MAXUSERS)
108	}
109
110	/*
111	* open_score:
112	* Open up the score file for future use, and then
113	* setuid(getuid()) in case we are running setuid.
114	*/
115	open_score()
116	{
117	# ifdef SCOREFILE
118	Fd = open(SCOREFILE, 2);
119	# else SCOREFILE
120	Fd = -1;
121	# endif SCOREFILE
122	setuid(getuid());
123	setgid(getgid());
124	}
125
126	/*
127	* setup:
128	* Get starting setup for all games
129	*/
130	setup()
131	{
132	extern int auto_save(), quit(), endit(), tstp();
133	# ifdef CHECKTIME
134	extern int heckout();
135	# endif CHECKTIME
136
137	signal(SIGHUP, auto_save);
138	# ifndef DUMP
139	signal(SIGILL, auto_save);
140	signal(SIGTRAP, auto_save);
141	signal(SIGIOT, auto_save);
142	signal(SIGEMT, auto_save);
143	signal(SIGFPE, auto_save);
144	signal(SIGBUS, auto_save);
145	signal(SIGSEGV, auto_save);
146	signal(SIGSYS, auto_save);
147	signal(SIGTERM, auto_save);
148	# endif DUMP
149
150	signal(SIGINT, quit);
151	# ifndef DUMP
152	signal(SIGQUIT, endit);
153	# endif DUMP
154	# ifdef CHECKTIME
155	signal(SIGALRM, checkout);
156	alarm(CHECKTIME * 60);
157	Num_checks = 0;
158	# endif CHECKTIME
159	crmode(); /* Cbreak mode */
160	noecho(); /* Echo off */
161	nonl();
162	# ifdef TIOCGLTC
163	getltchars(); /* get the local tty chars */
164	# endif TIOCGLTC
165	}
166
167	/*
168	* getltchars:
169	* Get the local tty chars for later use
170	*/
171	getltchars()
172	{
173	# ifdef TIOCGLTC
174	ioctl(1, TIOCGLTC, &Ltc);
175	Got_ltc = TRUE;
176	Orig_dsusp = Ltc.t_dsuspc;
177	Ltc.t_dsuspc = Ltc.t_suspc;
178	ioctl(1, TIOCSLTC, &Ltc);
179	# endif TIOCGLTC
180	}
181
182	/*
183	* start_score:
184	* Start the scoring sequence
185	*/
186	start_score()
187	{
188	# ifdef CHECKTIME
189	signal(SIGALRM, SIG_IGN); /* NOSTRICT */
190	# endif CHECKTIME
191	}
192
193	/*
194	* symlink:
195	* See if the file has a symbolic link
196	*/
197	symlink(sp)
198	char *sp;
199	{
200	# ifdef S_IFLNK
201	struct stat sbuf2;
202
203	if (lstat(sp, &sbuf2) < 0)
204	return FALSE;
205	else
206	return ((sbuf2.st_mode & S_IFMT) != S_IFREG);
207	# else S_IFLNK
208	return FALSE;
209	# endif S_IFLNK
210	}
211
212	# if defined(MAXLOAD) \|\| defined(MAXUSERS)
213	/*
214	* too_much:
215	* See if the system is being used too much for this game
216	*/
217	too_much()
218	{
219	# ifdef MAXLOAD
220	double avec[3];
221	# endif MAXLOAD
222	# ifdef MAXUSERS
223	register int cnt;
224	# endif MAXUSERS
225
226	# ifdef MAXLOAD
227	loadav(avec);
228	if (avec[1] > MAXLOAD)
229	return TRUE;
230	# endif MAXLOAD
231	# ifdef MAXUSERS
232	if (ucount() > MAXUSERS)
233	return TRUE;
234	# endif MAXUSERS
235	return FALSE;
236	}
237
238	/*
239	* author:
240	* See if a user is an author of the program
241	*/
242	author()
243	{
244	# ifdef MASTER
245	if (Wizard)
246	return TRUE;
247	# endif MASTER
248	switch (getuid())
249	{
250	case -1:
251	return TRUE;
252	default:
253	return FALSE;
254	}
255	}
256	# endif defined(MAXLOAD) \|\| defined(MAXUSERS)
257
258	# ifdef CHECKTIME
259	/*
260	* checkout:
261	* Check each CHECKTIME seconds to see if the load is too high
262	*/
263	checkout()
264	{
265	int checktime;
266	static char *msgs[] = {
267	"The load is too high to be playing. Please leave in %.2f minutes",
268	"Please save your game. You have %.2f minutes",
269	"Last warning. You have %.2f minutes to leave",
270	};
271
272	signal(SIGALRM, checkout);
273	if (too_much()) {
274	if (author()) {
275	Num_checks = 1;
276	chmsg("The load is rather high, O exaulted one");
277	}
278	else if (Num_checks++ == 3)
279	fatal("Sorry. You took too long. You are dead\n");
280	checktime = (WARNTIME * 60) / Num_checks;
281	alarm(checktime);
282	chmsg(msgs[Num_checks - 1], ((double) checktime / 60.0));
283	}
284	else {
285	if (Num_checks) {
286	Num_checks = 0;
287	chmsg("The load has dropped back down. You have a reprieve");
288	}
289	alarm(CHECKTIME * 60);
290	}
291	}
292
293	/*
294	* chmsg:
295	* checkout()'s version of msg. If we are in the middle of a
296	* shell, do a printf instead of a msg to avoid the refresh.
297	*/
298	/* VARARGS1 */
299	chmsg(fmt, arg)
300	char *fmt;
301	int arg;
302	{
303	if (!In_shell)
304	msg(fmt, arg);
305	else {
306	printf(fmt, arg);
307	putchar('\n');
308	fflush(stdout);
309	}
310	}
311	# endif defined(MAXLOAD) \|\| defined(MAXUSERS)
312
313	# ifdef LOADAV
314	/*
315	* loadav:
316	* Looking up load average in core (for system where the loadav()
317	* system call isn't defined
318	*/
319
320	# include <nlist.h>
321
322	struct nlist avenrun = {
323	"_avenrun"
324	};
325
326	# ifndef NAMELIST
327	# define NAMELIST "/vmunix"
328	# endif
329
330	loadav(avg)
331	register double *avg;
332	{
333	register int kmem;
334
335	if ((kmem = open("/dev/kmem", 0)) < 0)
336	goto bad;
337	nlist(NAMELIST, &avenrun);
338	if (avenrun.n_type == 0) {
339	close(kmem);
340	bad:
341	avg[0] = 0.0;
342	avg[1] = 0.0;
343	avg[2] = 0.0;
344	return;
345	}
346
347	lseek(kmem, (long) avenrun.n_value, 0);
348	read(kmem, (char ) avg, 3 sizeof (double));
349	close(kmem);
350	}
351	# endif LOADAV
352
353	# ifdef UCOUNT
354	/*
355	* ucount:
356	* Count number of users on the system
357	*/
358	# include <utmp.h>
359
360	struct utmp buf;
361
362	ucount()
363	{
364	register struct utmp *up;
365	register FILE *utmp;
366	register int count;
367
368	if ((utmp = fopen(UTMP, "r")) == NULL)
369	return 0;
370
371	up = &buf;
372	count = 0;
373
374	while (fread(up, 1, sizeof (*up), utmp) > 0)
375	if (buf.ut_name[0] != '\0')
376	count++;
377	fclose(utmp);
378	return count;
379	}
380	# endif UCOUNT
381
382	/*
383	* lock_sc:
384	* lock the score file. If it takes too long, ask the user if
385	* they care to wait. Return TRUE if the lock is successful.
386	*/
387	lock_sc()
388	{
389	# ifdef SCOREFILE
390	# ifdef LOCK_EX
391	return (flock(Fd, LOCK_EX) >= 0);
392	# else LOCK_EX
393	register int cnt;
394	static struct stat sbuf;
395
396	over:
397	close(8); /* just in case there are no files left */
398	if (creat(Lockfile, 0000) >= 0)
399	return TRUE;
400	for (cnt = 0; cnt < 5; cnt++) {
401	sleep(1);
402	if (creat(Lockfile, 0000) >= 0)
403	return TRUE;
404	}
405	if (stat(Lockfile, &sbuf) < 0) {
406	creat(Lockfile, 0000);
407	return TRUE;
408	}
409	if (time(NULL) - sbuf.st_mtime > 10) {
410	if (unlink(Lockfile) < 0)
411	return FALSE;
412	goto over;
413	}
414	else {
415	printf("The score file is very busy. Do you want to wait longer\n");
416	printf("for it to become free so your score can get posted?\n");
417	printf("If so, type \"y\"\n");
418	fgets(Prbuf, MAXSTR, stdin);
419	if (Prbuf[0] == 'y')
420	for (;;) {
421	if (creat(Lockfile, 0000) >= 0)
422	return TRUE;
423	if (stat(Lockfile, &sbuf) < 0) {
424	creat(Lockfile, 0000);
425	return TRUE;
426	}
427	if (time(NULL) - sbuf.st_mtime > 10)
428	if (unlink(Lockfile) < 0)
429	return FALSE;
430	sleep(1);
431	}
432	else
433	return FALSE;
434	}
435	# endif LOCK_EX
436	# endif SCOREFILE
437	}
438
439	/*
440	* unlock_sc:
441	* Unlock the score file
442	*/
443	unlock_sc()
444	{
445	# ifdef SCOREFILE
446	# ifdef LOCK_EX
447	flock(Fd, LOCK_UN);
448	#else
449	unlink(Lockfile);
450	# endif
451	# endif
452	}