[unix-history] / usr / src / sbin / dump / optr.c

static	char *sccsid = "@(#)optr.c	1.6 (Berkeley) %G%";

#include "dump.h"

/*
 *	This is from /usr/include/grp.h
 *	That defined struct group, which conflicts
 *	with the struct group defined in param.h
 */
struct	Group { /* see getgrent(3) */
	char	*gr_name;
	char	*gr_passwd;
	int	gr_gid;
	char	**gr_mem;
};
struct	Group *getgrnam();
/*
 *	Query the operator; This fascist piece of code requires
 *	an exact response.
 *	It is intended to protect dump aborting by inquisitive
 *	people banging on the console terminal to see what is
 *	happening which might cause dump to croak, destroying
 *	a large number of hours of work.
 *
 *	Every 2 minutes we reprint the message, alerting others
 *	that dump needs attention.
 */
int	timeout;
char	*attnmessage;		/* attemtion message */
query(question)
	char	*question;
{
	char	replybuffer[64];
	int	back;
	FILE	*mytty;

	if ( (mytty = fopen("/dev/tty", "r")) == NULL){
		msg("fopen on /dev/tty fails\n");
		abort();
	}
	attnmessage = question;
	timeout = 0;
	alarmcatch();
	for(;;){
		if ( fgets(replybuffer, 63, mytty) == NULL){
			if (ferror(mytty)){
				clearerr(mytty);
				continue;
			}
		} else if ( (strcmp(replybuffer, "yes\n") == 0) ||
			    (strcmp(replybuffer, "Yes\n") == 0)){
				back = 1;
				goto done;
		} else if ( (strcmp(replybuffer, "no\n") == 0) ||
			    (strcmp(replybuffer, "No\n") == 0)){
				back = 0;
				goto done;
		} else {
			msg("\"Yes\" or \"No\" ONLY!\n");
			alarmcatch();
		}
	}
    done:
	/*
	 *	Turn off the alarm, and reset the signal to trap out..
	 */
	alarm(0);
	if (signal(SIGALRM, sigalrm) == SIG_IGN)
		signal(SIGALRM, SIG_IGN);
	fclose(mytty);
	return(back);
}
/*
 *	Alert the console operator, and enable the alarm clock to
 *	sleep for 2 minutes in case nobody comes to satisfy dump
 */
alarmcatch()
{
	if (timeout)
		msgtail("\n");
	msg("NEEDS ATTENTION: %s: (\"yes\" or \"no\") ",
		attnmessage);
	signal(SIGALRM, alarmcatch);
	alarm(120);
	timeout = 1;
}
/*
 *	Here if an inquisitive operator interrupts the dump program
 */
interrupt()
{
	msg("Interrupt received. Do >>>YOU<<< know what are you doing?\n");
	if (query("Do you really want to abort dump?"))
		dumpabort();
	signal(SIGINT, interrupt);
}

/*
 *	The following variables and routines manage alerting
 *	operators to the status of dump.
 *	This works much like wall(1) does.
 */
struct	Group *gp;

/*
 *	Get the names from the group entry "operator" to notify.
 */	
set_operators()
{
	if (!notify)		/*not going to notify*/
		return;
	gp = getgrnam(OPGRENT);
	endgrent();
	if (gp == (struct Group *)0){
		msg("No entry in /etc/group for %s.\n",
			OPGRENT);
		notify = 0;
		return;
	}
}

struct tm *localtime();
struct tm *localclock;

/*
 *	We fork a child to do the actual broadcasting, so
 *	that the process control groups are not messed up
 */
broadcast(message)
	char	*message;
{
	time_t		clock;
	FILE	*f_utmp;
	struct	utmp	utmp;
	int	nusers;
	char	**np;
	int	pid, s;

	switch (pid = fork()) {
	case -1:
		return;
	case 0:
		break;
	default:
		while (wait(&s) != pid)
			continue;
		return;
	}

	if (!notify || gp == 0)
		exit(0);
	clock = time(0);
	localclock = localtime(&clock);

	if((f_utmp = fopen("/etc/utmp", "r")) == NULL) {
		msg("Cannot open /etc/utmp\n");
		return;
	}

	nusers = 0;
	while (!feof(f_utmp)){
		if (fread(&utmp, sizeof (struct utmp), 1, f_utmp) != 1)
			break;
		if (utmp.ut_name[0] == 0)
			continue;
		nusers++;
		for (np = gp->gr_mem; *np; np++){
			if (strncmp(*np, utmp.ut_name, sizeof(utmp.ut_name)) != 0)
				continue;
			/*
			 *	Do not send messages to operators on dialups
			 */
			if (strncmp(utmp.ut_line, DIALUP, strlen(DIALUP)) == 0)
				continue;
#ifdef DEBUG
			msg("Message to %s at %s\n",
				utmp.ut_name, utmp.ut_line);
#endif DEBUG
			sendmes(utmp.ut_line, message);
		}
	}
	fclose(f_utmp);
	Exit(0);	/* the wait in this same routine will catch this */
	/* NOTREACHED */
}

sendmes(tty, message)
	char *tty, *message;
{
	char t[50], buf[BUFSIZ];
	register char *cp;
	register int c, ch;
	int	msize;
	FILE *f_tty;

	msize = strlen(message);
	strcpy(t, "/dev/");
	strcat(t, tty);

	if((f_tty = fopen(t, "w")) != NULL) {
		setbuf(f_tty, buf);
		fprintf(f_tty, "\n\a\a\aMessage from the dump program to all operators at %d:%02d ...\r\n\n"
		       ,localclock->tm_hour
		       ,localclock->tm_min);
		for (cp = message, c = msize; c-- > 0; cp++) {
			ch = *cp;
			if (ch == '\n')
				putc('\r', f_tty);
			putc(ch, f_tty);
		}
		fclose(f_tty);
	}
}

/*
 *	print out an estimate of the amount of time left to do the dump
 */

time_t	tschedule = 0;

timeest()
{
	time_t	tnow, deltat;

	time (&tnow);
	if (tnow >= tschedule){
		tschedule = tnow + 300;
		if (blockswritten < 500)
			return;	
		deltat = tstart_writing - tnow +
			(((1.0*(tnow - tstart_writing))/blockswritten) * esize);
		msg("%3.2f%% done, finished in %d:%02d\n",
			(blockswritten*100.0)/esize,
			deltat/3600, (deltat%3600)/60);
	}
}

int blocksontape()
{
	/*
	 *	esize: total number of blocks estimated over all reels
	 *	blockswritten:	blocks actually written, over all reels
	 *	etapes:	estimated number of tapes to write
	 *
	 *	tsize:	blocks can write on this reel
	 *	asize:	blocks written on this reel
	 *	tapeno:	number of tapes written so far
	 */
	if (tapeno == etapes)
		return(esize - (etapes - 1)*tsize);
	return(tsize);
}

	/* VARARGS1 */
	/* ARGSUSED */
msg(fmt, a1, a2, a3, a4, a5)
	char	*fmt;
	int	a1, a2, a3, a4, a5;
{
	fprintf(stderr,"  DUMP: ");
#ifdef TDEBUG
	fprintf(stderr,"pid=%d ", getpid());
#endif
	fprintf(stderr, fmt, a1, a2, a3, a4, a5);
	fflush(stdout);
	fflush(stderr);
}

	/* VARARGS1 */
	/* ARGSUSED */
msgtail(fmt, a1, a2, a3, a4, a5)
	char	*fmt;
	int	a1, a2, a3, a4, a5;
{
	fprintf(stderr, fmt, a1, a2, a3, a4, a5);
}
/*
 *	Tell the operator what has to be done;
 *	we don't actually do it
 */

getfstab()
{
	register	struct	fstab	*dt;
			struct	fstab	*fsp;

	nfstab = 0;
	if (setfsent() == 0) {
		msg("Can't open %s for dump table information.\n", FSTAB);
	} else {
		for (nfstab = 0, dt = fstab; nfstab < MAXFSTAB;){
			if ( (fsp = getfsent()) == 0)
				break;
			if (   (strcmp(fsp->fs_type, FSTAB_RW) == 0)
			    || (strcmp(fsp->fs_type, FSTAB_RO) == 0) ){
				*dt = *fsp;
				nfstab++; 
				dt++;
			}
		}
		endfsent();
	}
}

/*
 *	Search in the fstab for a file name.
 *	This file name can be either the special or the path file name.
 *
 *	The entries in the fstab are the BLOCK special names, not the
 *	character special names.
 *	The caller of fstabsearch assures that the character device
 *	is dumped (that is much faster)
 *
 *	The file name can omit the leading '/'.
 */
struct	fstab	*fstabsearch(key)
	char	*key;
{
	register	struct	fstab *dt;
			int	i;
			int	keylength;
			char	*rawname();

	keylength = min(strlen(key), sizeof (dt->fs_file));
	for (i = 0, dt = fstab; i < nfstab; i++, dt++){
		if (strncmp(dt->fs_file, key, keylength) == 0)
			return(dt);
		if (strncmp(dt->fs_spec, key, keylength) == 0)
			return(dt);
		if (strncmp(rawname(dt->fs_spec), key, keylength) == 0)
			return(dt);

		if (key[0] != '/'){
			if (   (dt->fs_spec[0] == '/')
			    && (strncmp(dt->fs_spec+1, key, keylength) == 0))
				return(dt);
			if (   (dt->fs_file[0] == '/')
			    && (strncmp(dt->fs_file+1, key, keylength) == 0))
				return(dt);
		}
	}
	return(0);
}

/*
 *	Tell the operator what to do
 */
lastdump(arg)
	char	arg;		/* w ==> just what to do; W ==> most recent dumps */
{
			char	*lastname;
			char	*date;
	register	int	i;
			time_t	tnow;
	register	struct	fstab	*dt;
			int	dumpme;
	register	struct	idates	*itwalk;

	int	idatesort();

	time(&tnow);
	getfstab();		/* /etc/fstab input */
	inititimes();		/* /etc/dumpdates input */
	qsort(idatev, nidates, sizeof(struct idates *), idatesort);

	if (arg == 'w')
		fprintf(stdout, "Dump these file systems:\n");
	else
		fprintf(stdout, "Last dump(s) done (Dump '>' file systems):\n");
	lastname = "??";
	ITITERATE(i, itwalk){
		if (strncmp(lastname, itwalk->id_name, sizeof(itwalk->id_name)) == 0)
			continue;
		date = (char *)ctime(&itwalk->id_ddate);
		date[16] = '\0';		/* blast away seconds and year */
		lastname = itwalk->id_name;
		dt = fstabsearch(itwalk->id_name);
		dumpme = (  (dt != 0)
			 && (dt->fs_freq != 0)
			 && (itwalk->id_ddate < tnow - (dt->fs_freq*DAY)));
		if ( (arg != 'w') || dumpme)
		  fprintf(stdout,"%c %8s\t(%6s) Last dump: Level %c, Date %s\n",
			dumpme && (arg != 'w') ? '>' : ' ',
			itwalk->id_name,
			dt ? dt->fs_file : "",
			itwalk->id_incno,
			date
		    );
	}
}

int	idatesort(p1, p2)
	struct	idates	**p1, **p2;
{
	int	diff;

	diff = strncmp((*p1)->id_name, (*p2)->id_name, sizeof((*p1)->id_name));
	if (diff == 0)
		return ((*p2)->id_ddate - (*p1)->id_ddate);
	else
		return (diff);
}

int max(a,b)
	int a, b;
{
	return(a>b?a:b);
}
int min(a,b)
	int a, b;
{
	return(a<b?a:b);
}
Commit	Line	Data
1ddebffe	1	static char *sccsid = "@(#)optr.c 1.6 (Berkeley) %G%";
661913e7	2
f3869107 BJ	3	#include "dump.h"
	4
	5	/*
	6	* This is from /usr/include/grp.h
	7	* That defined struct group, which conflicts
	8	* with the struct group defined in param.h
	9	*/
	10	struct Group { /* see getgrent(3) */
	11	char *gr_name;
	12	char *gr_passwd;
	13	int gr_gid;
	14	char **gr_mem;
	15	};
	16	struct Group *getgrnam();
	17	/*
	18	* Query the operator; This fascist piece of code requires
	19	* an exact response.
	20	* It is intended to protect dump aborting by inquisitive
	21	* people banging on the console terminal to see what is
	22	* happening which might cause dump to croak, destroying
	23	* a large number of hours of work.
	24	*
	25	* Every 2 minutes we reprint the message, alerting others
	26	* that dump needs attention.
	27	*/
	28	int timeout;
	29	char attnmessage; / attemtion message */
	30	query(question)
	31	char *question;
	32	{
	33	char replybuffer[64];
	34	int back;
	35	FILE *mytty;
	36
	37	if ( (mytty = fopen("/dev/tty", "r")) == NULL){
	38	msg("fopen on /dev/tty fails\n");
	39	abort();
	40	}
	41	attnmessage = question;
	42	timeout = 0;
	43	alarmcatch();
	44	for(;;){
	45	if ( fgets(replybuffer, 63, mytty) == NULL){
	46	if (ferror(mytty)){
	47	clearerr(mytty);
	48	continue;
	49	}
	50	} else if ( (strcmp(replybuffer, "yes\n") == 0) \|\|
	51	(strcmp(replybuffer, "Yes\n") == 0)){
	52	back = 1;
	53	goto done;
	54	} else if ( (strcmp(replybuffer, "no\n") == 0) \|\|
	55	(strcmp(replybuffer, "No\n") == 0)){
	56	back = 0;
	57	goto done;
	58	} else {
	59	msg("\"Yes\" or \"No\" ONLY!\n");
	60	alarmcatch();
	61	}
	62	}
	63	done:
	64	/*
	65	* Turn off the alarm, and reset the signal to trap out..
	66	*/
67	alarm(0);
68	if (signal(SIGALRM, sigalrm) == SIG_IGN)
69	signal(SIGALRM, SIG_IGN);
70	fclose(mytty);
71	return(back);
72	}
73	/*
74	* Alert the console operator, and enable the alarm clock to
75	* sleep for 2 minutes in case nobody comes to satisfy dump
76	*/
77	alarmcatch()
78	{
79	if (timeout)
80	msgtail("\n");
81	msg("NEEDS ATTENTION: %s: (\"yes\" or \"no\") ",
82	attnmessage);
83	signal(SIGALRM, alarmcatch);
84	alarm(120);
85	timeout = 1;
86	}
87	/*
88	* Here if an inquisitive operator interrupts the dump program
89	*/
90	interrupt()
91	{
92	msg("Interrupt received. Do >>>YOU<<< know what are you doing?\n");
93	if (query("Do you really want to abort dump?"))
94	dumpabort();
95	signal(SIGINT, interrupt);
96	}
97
98	/*
99	* The following variables and routines manage alerting
100	* operators to the status of dump.
101	* This works much like wall(1) does.
102	*/
103	struct Group *gp;
104
105	/*
106	* Get the names from the group entry "operator" to notify.
107	*/
108	set_operators()
109	{
110	if (!notify) /not going to notify/
111	return;
112	gp = getgrnam(OPGRENT);
113	endgrent();
114	if (gp == (struct Group *)0){
115	msg("No entry in /etc/group for %s.\n",
116	OPGRENT);
117	notify = 0;
118	return;
119	}
120	}
121
122	struct tm *localtime();
123	struct tm *localclock;
124
125	/*
126	* We fork a child to do the actual broadcasting, so
127	* that the process control groups are not messed up
128	*/
129	broadcast(message)
130	char *message;
131	{
132	time_t clock;
133	FILE *f_utmp;
134	struct utmp utmp;
135	int nusers;
136	char **np;
137	int pid, s;
138
139	switch (pid = fork()) {
140	case -1:
141	return;
142	case 0:
143	break;
144	default:
145	while (wait(&s) != pid)
146	continue;
147	return;
148	}
149
150	if (!notify \|\| gp == 0)
ed7c701e	151	exit(0);
f3869107 BJ	152	clock = time(0);
	153	localclock = localtime(&clock);
	154
	155	if((f_utmp = fopen("/etc/utmp", "r")) == NULL) {
	156	msg("Cannot open /etc/utmp\n");
	157	return;
	158	}
	159
	160	nusers = 0;
	161	while (!feof(f_utmp)){
	162	if (fread(&utmp, sizeof (struct utmp), 1, f_utmp) != 1)
	163	break;
	164	if (utmp.ut_name[0] == 0)
	165	continue;
	166	nusers++;
	167	for (np = gp->gr_mem; *np; np++){
	168	if (strncmp(*np, utmp.ut_name, sizeof(utmp.ut_name)) != 0)
	169	continue;
	170	/*
	171	* Do not send messages to operators on dialups
	172	*/
	173	if (strncmp(utmp.ut_line, DIALUP, strlen(DIALUP)) == 0)
	174	continue;
	175	#ifdef DEBUG
	176	msg("Message to %s at %s\n",
	177	utmp.ut_name, utmp.ut_line);
	178	#endif DEBUG
	179	sendmes(utmp.ut_line, message);
	180	}
	181	}
	182	fclose(f_utmp);
	183	Exit(0); /* the wait in this same routine will catch this */
	184	/* NOTREACHED */
	185	}
	186
	187	sendmes(tty, message)
661913e7	188	char tty, message;
f3869107 BJ	189	{
	190	char t[50], buf[BUFSIZ];
	191	register char *cp;
	192	register int c, ch;
	193	int msize;
	194	FILE *f_tty;
	195
	196	msize = strlen(message);
	197	strcpy(t, "/dev/");
	198	strcat(t, tty);
	199
	200	if((f_tty = fopen(t, "w")) != NULL) {
	201	setbuf(f_tty, buf);
	202	fprintf(f_tty, "\n\a\a\aMessage from the dump program to all operators at %d:%02d ...\r\n\n"
	203	,localclock->tm_hour
	204	,localclock->tm_min);
	205	for (cp = message, c = msize; c-- > 0; cp++) {
	206	ch = *cp;
	207	if (ch == '\n')
	208	putc('\r', f_tty);
	209	putc(ch, f_tty);
	210	}
	211	fclose(f_tty);
	212	}
	213	}
	214
	215	/*
	216	* print out an estimate of the amount of time left to do the dump
	217	*/
	218
	219	time_t tschedule = 0;
	220
	221	timeest()
	222	{
	223	time_t tnow, deltat;
	224
	225	time (&tnow);
	226	if (tnow >= tschedule){
	227	tschedule = tnow + 300;
	228	if (blockswritten < 500)
	229	return;
	230	deltat = tstart_writing - tnow +
	231	(((1.0(tnow - tstart_writing))/blockswritten) esize);
	232	msg("%3.2f%% done, finished in %d:%02d\n",
	233	(blockswritten*100.0)/esize,
	234	deltat/3600, (deltat%3600)/60);
	235	}
	236	}
	237
	238	int blocksontape()
	239	{
	240	/*
	241	* esize: total number of blocks estimated over all reels
	242	* blockswritten: blocks actually written, over all reels
	243	* etapes: estimated number of tapes to write
	244	*
	245	* tsize: blocks can write on this reel
	246	* asize: blocks written on this reel
	247	* tapeno: number of tapes written so far
	248	*/
	249	if (tapeno == etapes)
	250	return(esize - (etapes - 1)*tsize);
	251	return(tsize);
	252	}
253
254	/* VARARGS1 */
255	/* ARGSUSED */
256	msg(fmt, a1, a2, a3, a4, a5)
257	char *fmt;
661913e7	258	int a1, a2, a3, a4, a5;
f3869107 BJ	259	{
	260	fprintf(stderr," DUMP: ");
	261	#ifdef TDEBUG
	262	fprintf(stderr,"pid=%d ", getpid());
	263	#endif
	264	fprintf(stderr, fmt, a1, a2, a3, a4, a5);
	265	fflush(stdout);
	266	fflush(stderr);
	267	}
	268
	269	/* VARARGS1 */
	270	/* ARGSUSED */
	271	msgtail(fmt, a1, a2, a3, a4, a5)
	272	char *fmt;
661913e7	273	int a1, a2, a3, a4, a5;
f3869107 BJ	274	{
	275	fprintf(stderr, fmt, a1, a2, a3, a4, a5);
	276	}
	277	/*
	278	* Tell the operator what has to be done;
	279	* we don't actually do it
	280	*/
	281
	282	getfstab()
	283	{
	284	register struct fstab *dt;
9ba0a26f	285	struct fstab *fsp;
f3869107 BJ	286
f3869107 BJ	287	nfstab = 0;
9ba0a26f	288	if (setfsent() == 0) {
f3869107 BJ	289	msg("Can't open %s for dump table information.\n", FSTAB);
	290	} else {
	291	for (nfstab = 0, dt = fstab; nfstab < MAXFSTAB;){
9ba0a26f	292	if ( (fsp = getfsent()) == 0)
f3869107	293	break;
9ba0a26f BJ	294	if ( (strcmp(fsp->fs_type, FSTAB_RW) == 0)
	295	\|\| (strcmp(fsp->fs_type, FSTAB_RO) == 0) ){
	296	dt = fsp;
	297	nfstab++;
	298	dt++;
	299	}
f3869107	300	}
9ba0a26f	301	endfsent();
f3869107 BJ	302	}
	303	}
	304
	305	/*
	306	* Search in the fstab for a file name.
	307	* This file name can be either the special or the path file name.
	308	*
	309	* The entries in the fstab are the BLOCK special names, not the
	310	* character special names.
	311	* The caller of fstabsearch assures that the character device
	312	* is dumped (that is much faster)
	313	*
	314	* The file name can omit the leading '/'.
	315	*/
	316	struct fstab *fstabsearch(key)
	317	char *key;
	318	{
	319	register struct fstab *dt;
	320	int i;
	321	int keylength;
	322	char *rawname();
	323
	324	keylength = min(strlen(key), sizeof (dt->fs_file));
	325	for (i = 0, dt = fstab; i < nfstab; i++, dt++){
	326	if (strncmp(dt->fs_file, key, keylength) == 0)
	327	return(dt);
	328	if (strncmp(dt->fs_spec, key, keylength) == 0)
	329	return(dt);
	330	if (strncmp(rawname(dt->fs_spec), key, keylength) == 0)
	331	return(dt);
	332
	333	if (key[0] != '/'){
	334	if ( (dt->fs_spec[0] == '/')
	335	&& (strncmp(dt->fs_spec+1, key, keylength) == 0))
	336	return(dt);
	337	if ( (dt->fs_file[0] == '/')
	338	&& (strncmp(dt->fs_file+1, key, keylength) == 0))
	339	return(dt);
	340	}
	341	}
	342	return(0);
	343	}
	344
	345	/*
	346	* Tell the operator what to do
	347	*/
77db894d BJ	348	lastdump(arg)
77db894d BJ	349	char arg; /* w ==> just what to do; W ==> most recent dumps */
f3869107 BJ	350	{
	351	char *lastname;
	352	char *date;
	353	register int i;
	354	time_t tnow;
	355	register struct fstab *dt;
	356	int dumpme;
	357	register struct idates *itwalk;
	358
	359	int idatesort();
	360
	361	time(&tnow);
	362	getfstab(); /* /etc/fstab input */
	363	inititimes(); /* /etc/dumpdates input */
	364	qsort(idatev, nidates, sizeof(struct idates *), idatesort);
	365
77db894d BJ	366	if (arg == 'w')
	367	fprintf(stdout, "Dump these file systems:\n");
	368	else
	369	fprintf(stdout, "Last dump(s) done (Dump '>' file systems):\n");
f3869107 BJ	370	lastname = "??";
	371	ITITERATE(i, itwalk){
	372	if (strncmp(lastname, itwalk->id_name, sizeof(itwalk->id_name)) == 0)
	373	continue;
	374	date = (char *)ctime(&itwalk->id_ddate);
	375	date[16] = '\0'; /* blast away seconds and year */
	376	lastname = itwalk->id_name;
	377	dt = fstabsearch(itwalk->id_name);
	378	dumpme = ( (dt != 0)
	379	&& (dt->fs_freq != 0)
	380	&& (itwalk->id_ddate < tnow - (dt->fs_freq*DAY)));
77db894d BJ	381	if ( (arg != 'w') \|\| dumpme)
	382	fprintf(stdout,"%c %8s\t(%6s) Last dump: Level %c, Date %s\n",
	383	dumpme && (arg != 'w') ? '>' : ' ',
f3869107	384	itwalk->id_name,
1ddebffe	385	dt ? dt->fs_file : "",
f3869107 BJ	386	itwalk->id_incno,
	387	date
	388	);
	389	}
	390	}
	391
	392	int idatesort(p1, p2)
	393	struct idates p1, p2;
	394	{
	395	int diff;
	396
	397	diff = strncmp((p1)->id_name, (p2)->id_name, sizeof((*p1)->id_name));
	398	if (diff == 0)
	399	return ((p2)->id_ddate - (p1)->id_ddate);
	400	else
	401	return (diff);
	402	}
	403
	404	int max(a,b)
661913e7	405	int a, b;
f3869107 BJ	406	{
	407	return(a>b?a:b);
	408	}
	409	int min(a,b)
661913e7	410	int a, b;
f3869107 BJ	411	{
	412	return(a<b?a:b);
	413	}