[unix-history] / usr / src / sbin / init / init.c

static	char *sccsid = "@(#)init.c	4.8 (Berkeley) %G%";
#include <signal.h>
#include <sys/types.h>
#include <utmp.h>
#include <setjmp.h>
#include <sys/reboot.h>
#include <errno.h>

#define	LINSIZ	sizeof(wtmp.ut_line)
#define	TABSIZ	100
#define	ALL	p = &itab[0]; p < &itab[TABSIZ]; p++
#define	EVER	;;
#define SCPYN(a, b)	strncpy(a, b, sizeof(a))
#define SCMPN(a, b)	strncmp(a, b, sizeof(a))

char	shell[]	= "/bin/sh";
char	getty[]	 = "/etc/getty";
char	minus[]	= "-";
char	runc[]	= "/etc/rc";
char	ifile[]	= "/etc/ttys";
char	utmp[]	= "/etc/utmp";
char	wtmpf[]	= "/usr/adm/wtmp";
char	ctty[]	= "/dev/console";
char	dev[]	= "/dev/";

struct utmp wtmp;
struct
{
	char	line[LINSIZ];
	char	comn;
	char	flag;
} line;
struct	tab
{
	char	line[LINSIZ];
	char	comn;
	char	xflag;
	int	pid;
	time_t	gettytime;
	int	gettycnt;
} itab[TABSIZ];

int	fi;
int	mergflag;
char	tty[20];
jmp_buf	sjbuf, shutpass;
time_t	time0;

int	reset();
int	idle();
char	*strcpy(), *strcat();
long	lseek();

main()
{
	register int r11;		/* passed thru from boot */
	int howto, oldhowto;

	time0 = time(0);
	howto = r11;
	setjmp(sjbuf);
	signal(SIGTERM, reset);
	signal(SIGTSTP, idle);
	signal(SIGSTOP, SIG_IGN);
	signal(SIGTTIN, SIG_IGN);
	signal(SIGTTOU, SIG_IGN);
	for(EVER) {
		oldhowto = howto;
		howto = RB_SINGLE;
		if (setjmp(shutpass) == 0)
			shutdown();
		if (oldhowto & RB_SINGLE)
			single();
		if (runcom(oldhowto) == 0) 
			continue;
		merge();
		multiple();
	}
}

int	shutreset();

shutdown()
{
	register i;
	register struct tab *p;

	close(creat(utmp, 0644));
	signal(SIGHUP, SIG_IGN);
	for(ALL) {
		term(p);
		p->line[0] = 0;
	}
	signal(SIGALRM, shutreset);
	alarm(30);
	for(i=0; i<5; i++)
		kill(-1, SIGKILL);
	while(wait((int *)0) != -1)
		;
	alarm(0);
	shutend();
}

char shutfailm[] = "WARNING: Something is hung (wont die); ps axl advised\n";

shutreset()
{
	int status;

	if (fork() == 0) {
		int ct = open(ctty, 1);
		write(ct, shutfailm, sizeof (shutfailm));
		sleep(5);
		exit(1);
	}
	sleep(5);
	shutend();
	longjmp(shutpass, 1);
}

shutend()
{
	register i, f;

	acct(0);
	signal(SIGALRM, SIG_DFL);
	for(i=0; i<10; i++)
		close(i);
	f = open(wtmpf, 1);
	if (f >= 0) {
		lseek(f, 0L, 2);
		SCPYN(wtmp.ut_line, "~");
		SCPYN(wtmp.ut_name, "shutdown");
		time(&wtmp.ut_time);
		write(f, (char *)&wtmp, sizeof(wtmp));
		close(f);
	}
	return(1);
}

single()
{
	register pid;
	register xpid;
	extern	errno;

   do {
	pid = fork();
	if(pid == 0) {
/*
		alarm(300);
*/
		signal(SIGTERM, SIG_DFL);
		signal(SIGHUP, SIG_DFL);
		signal(SIGALRM, SIG_DFL);
		open(ctty, 2);
		dup(0);
		dup(0);
		execl(shell, minus, (char *)0);
		exit(0);
	}
	while((xpid = wait((int *)0)) != pid)
		if (xpid == -1 && errno == ECHILD)
			break;
   } while (xpid == -1);
}

runcom(oldhowto)
	int oldhowto;
{
	register pid, f;
	int status;

	pid = fork();
	if(pid == 0) {
		open("/", 0);
		dup(0);
		dup(0);
		if (oldhowto & RB_SINGLE)
			execl(shell, shell, runc, (char *)0);
		else
			execl(shell, shell, runc, "autoboot", (char *)0);
		exit(1);
	}
	while(wait(&status) != pid)
		;
	if(status)
		return(0);
	f = open(wtmpf, 1);
	if (f >= 0) {
		lseek(f, 0L, 2);
		SCPYN(wtmp.ut_line, "~");
		SCPYN(wtmp.ut_name, "reboot");
		if (time0) {
			wtmp.ut_time = time0;
			time0 = 0;
		} else
			time(&wtmp.ut_time);
		write(f, (char *)&wtmp, sizeof(wtmp));
		close(f);
	}
	return(1);
}

setmerge()
{

	signal(SIGHUP, setmerge);
	mergflag = 1;
}

multiple()
{
	register struct tab *p;
	register pid;

loop:
	mergflag = 0;
	signal(SIGHUP, setmerge);
	for(EVER) {
		pid = wait((int *)0);
		if(mergflag) {
			merge();
			goto loop;
		}
		if(pid == -1)
			return;
		for(ALL)
			if(p->pid == pid || p->pid == -1) {
				rmut(p);
				dfork(p);
			}
	}
}

term(p)
register struct tab *p;
{

	if(p->pid != 0) {
		rmut(p);
		kill(p->pid, SIGKILL);
	}
	p->pid = 0;
}

rline()
{
	register c, i;

loop:
	c = get();
	if(c < 0)
		return(0);
	if(c == 0)
		goto loop;
	line.flag = c;
	c = get();
	if(c <= 0)
		goto loop;
	line.comn = c;
	SCPYN(line.line, "");
	for (i=0; i<LINSIZ; i++) {
		c = get();
		if(c <= 0)
			break;
		line.line[i] = c;
	}
	while(c > 0)
		c = get();
	if(line.line[0] == 0)
		goto loop;
	if(line.flag == '0')
		goto loop;
	strcpy(tty, dev);
	strncat(tty, line.line, LINSIZ);
	if(access(tty, 06) < 0)
		goto loop;
	return(1);
}

get()
{
	char b;

	if(read(fi, &b, 1) != 1)
		return(-1);
	if(b == '\n')
		return(0);
	return(b);
}

#define	FOUND	1
#define	CHANGE	2

merge()
{
	register struct tab *p;

	fi = open(ifile, 0);
	if(fi < 0)
		return;
	for(ALL)
		p->xflag = 0;
	while(rline()) {
		for(ALL) {
			if (SCMPN(p->line, line.line))
				continue;
			p->xflag |= FOUND;
			if(line.comn != p->comn) {
				p->xflag |= CHANGE;
				p->comn = line.comn;
			}
			goto contin1;
		}
		for(ALL) {
			if(p->line[0] != 0)
				continue;
			SCPYN(p->line, line.line);
			p->xflag |= FOUND|CHANGE;
			p->comn = line.comn;
			goto contin1;
		}
	contin1:
		;
	}
	close(fi);
	for(ALL) {
		if((p->xflag&FOUND) == 0) {
			term(p);
			p->line[0] = 0;
		}
		if((p->xflag&CHANGE) != 0) {
			term(p);
			dfork(p);
		}
	}
}

#include <sys/ioctl.h>

dfork(p)
struct tab *p;
{
	register pid;
	time_t t;
	int dowait = 0;

	time(&t);
	p->gettycnt++;
	if ((t - p->gettytime) >= 60) {
		p->gettytime = t;
		p->gettycnt = 1;
	} else {
		if (p->gettycnt >= 5) {
			dowait = 1;
			p->gettytime = t;
			p->gettycnt = 1;
		}
	}
	pid = fork();
	if(pid == 0) {
		int oerrno, f;
		extern int errno;

		signal(SIGTERM, SIG_DFL);
		signal(SIGHUP, SIG_IGN);
		if (dowait) {
			f = open("/dev/console", 1);
			write(f, "init: ", 6);
			write(f, tty, strlen(tty));
			write(f, ": getty failing, sleeping\n\r", 27);
			close(f);
			sleep(30);
			if ((f = open("/dev/tty", 2)) >= 0) {
				ioctl(f, TIOCNOTTY, 0);
				close(f);
			}
		}
		strcpy(tty, dev);
		strncat(tty, p->line, LINSIZ);
		chown(tty, 0, 0);
		chmod(tty, 0622);
		if (open(tty, 2) < 0) {
			int repcnt = 0;
			do {
				oerrno = errno;
				if (repcnt % 10 == 0) {
					f = open("/dev/console", 1);
					write(f, "init: ", 6);
					errno = oerrno, perror(tty);
					close(f);
					if ((f = open("/dev/tty", 2)) >= 0) {
						ioctl(f, TIOCNOTTY, 0);
						close(f);
					}
				}
				repcnt++;
				sleep(60);
			} while (open(tty, 2) < 0);
			exit(0);	/* have wrong control tty, start over */
		}
		vhangup();
		signal(SIGHUP, SIG_DFL);
		open(tty, 2);
		close(0);
		dup(1);
		dup(0);
		tty[0] = p->comn;
		tty[1] = 0;
		execl(getty, minus, tty, (char *)0);
		exit(0);
	}
	p->pid = pid;
}

rmut(p)
register struct tab *p;
{
	register f;
	int found = 0;

	f = open(utmp, 2);
	if(f >= 0) {
		while(read(f, (char *)&wtmp, sizeof(wtmp)) == sizeof(wtmp)) {
			if (SCMPN(wtmp.ut_line, p->line) || wtmp.ut_name[0]==0)
				continue;
			lseek(f, -(long)sizeof(wtmp), 1);
			SCPYN(wtmp.ut_name, "");
			time(&wtmp.ut_time);
			write(f, (char *)&wtmp, sizeof(wtmp));
			found++;
		}
		close(f);
	}
	if (found) {
		f = open(wtmpf, 1);
		if (f >= 0) {
			SCPYN(wtmp.ut_line, p->line);
			SCPYN(wtmp.ut_name, "");
			time(&wtmp.ut_time);
			lseek(f, (long)0, 2);
			write(f, (char *)&wtmp, sizeof(wtmp));
			close(f);
		}
	}
}

reset()
{
	longjmp(sjbuf, 1);
}

idle()
{
	register struct tab *p;
	register pid;

	signal(SIGTSTP, idle);
	for (;;) {
		pid = wait((int *) 0);
		if (mergflag)
			return;
		if (pid == -1)
			pause();
		else {
			for (ALL)
				if (p->pid == pid) {
					rmut(p);
					p->pid = -1;
				}
		}
	}
}
Commit	Line	Data
6d5b3c00	1	static char *sccsid = "@(#)init.c 4.8 (Berkeley) %G%";
7c8ab0e6 BJ	2	#include <signal.h>
	3	#include <sys/types.h>
	4	#include <utmp.h>
	5	#include <setjmp.h>
215943cc	6	#include <sys/reboot.h>
f570e1ff	7	#include <errno.h>
7c8ab0e6 BJ	8
	9	#define LINSIZ sizeof(wtmp.ut_line)
	10	#define TABSIZ 100
	11	#define ALL p = &itab[0]; p < &itab[TABSIZ]; p++
	12	#define EVER ;;
	13	#define SCPYN(a, b) strncpy(a, b, sizeof(a))
	14	#define SCMPN(a, b) strncmp(a, b, sizeof(a))
	15
	16	char shell[] = "/bin/sh";
215943cc	17	char getty[] = "/etc/getty";
7c8ab0e6 BJ	18	char minus[] = "-";
	19	char runc[] = "/etc/rc";
	20	char ifile[] = "/etc/ttys";
	21	char utmp[] = "/etc/utmp";
	22	char wtmpf[] = "/usr/adm/wtmp";
	23	char ctty[] = "/dev/console";
	24	char dev[] = "/dev/";
	25
	26	struct utmp wtmp;
	27	struct
	28	{
	29	char line[LINSIZ];
	30	char comn;
	31	char flag;
	32	} line;
	33	struct tab
	34	{
	35	char line[LINSIZ];
	36	char comn;
	37	char xflag;
	38	int pid;
43236707 BJ	39	time_t gettytime;
43236707 BJ	40	int gettycnt;
7c8ab0e6 BJ	41	} itab[TABSIZ];
	42
	43	int fi;
	44	int mergflag;
	45	char tty[20];
abf0db3c	46	jmp_buf sjbuf, shutpass;
f570e1ff	47	time_t time0;
7c8ab0e6 BJ	48
7c8ab0e6 BJ	49	int reset();
f570e1ff	50	int idle();
7c8ab0e6 BJ	51	char strcpy(), strcat();
	52	long lseek();
	53
	54	main()
	55	{
215943cc BJ	56	register int r11; /* passed thru from boot */
	57	int howto, oldhowto;
	58
f570e1ff	59	time0 = time(0);
215943cc	60	howto = r11;
7c8ab0e6 BJ	61	setjmp(sjbuf);
7c8ab0e6 BJ	62	signal(SIGTERM, reset);
f570e1ff	63	signal(SIGTSTP, idle);
7c8ab0e6	64	signal(SIGSTOP, SIG_IGN);
7c8ab0e6 BJ	65	signal(SIGTTIN, SIG_IGN);
	66	signal(SIGTTOU, SIG_IGN);
	67	for(EVER) {
215943cc BJ	68	oldhowto = howto;
215943cc BJ	69	howto = RB_SINGLE;
abf0db3c BJ	70	if (setjmp(shutpass) == 0)
abf0db3c BJ	71	shutdown();
215943cc BJ	72	if (oldhowto & RB_SINGLE)
	73	single();
	74	if (runcom(oldhowto) == 0)
	75	continue;
7c8ab0e6 BJ	76	merge();
	77	multiple();
	78	}
	79	}
	80
abf0db3c BJ	81	int shutreset();
abf0db3c BJ	82
7c8ab0e6 BJ	83	shutdown()
	84	{
	85	register i;
	86	register struct tab *p;
	87
	88	close(creat(utmp, 0644));
	89	signal(SIGHUP, SIG_IGN);
	90	for(ALL) {
	91	term(p);
	92	p->line[0] = 0;
	93	}
abf0db3c BJ	94	signal(SIGALRM, shutreset);
abf0db3c BJ	95	alarm(30);
7c8ab0e6 BJ	96	for(i=0; i<5; i++)
	97	kill(-1, SIGKILL);
	98	while(wait((int *)0) != -1)
	99	;
	100	alarm(0);
abf0db3c BJ	101	shutend();
	102	}
	103
	104	char shutfailm[] = "WARNING: Something is hung (wont die); ps axl advised\n";
	105
	106	shutreset()
	107	{
	108	int status;
	109
	110	if (fork() == 0) {
	111	int ct = open(ctty, 1);
	112	write(ct, shutfailm, sizeof (shutfailm));
	113	sleep(5);
	114	exit(1);
	115	}
	116	sleep(5);
	117	shutend();
	118	longjmp(shutpass, 1);
	119	}
	120
	121	shutend()
	122	{
f570e1ff	123	register i, f;
abf0db3c	124
f570e1ff	125	acct(0);
7c8ab0e6 BJ	126	signal(SIGALRM, SIG_DFL);
	127	for(i=0; i<10; i++)
	128	close(i);
f570e1ff BJ	129	f = open(wtmpf, 1);
	130	if (f >= 0) {
	131	lseek(f, 0L, 2);
	132	SCPYN(wtmp.ut_line, "~");
	133	SCPYN(wtmp.ut_name, "shutdown");
	134	time(&wtmp.ut_time);
	135	write(f, (char *)&wtmp, sizeof(wtmp));
	136	close(f);
	137	}
	138	return(1);
7c8ab0e6 BJ	139	}
	140
	141	single()
	142	{
	143	register pid;
f570e1ff BJ	144	register xpid;
f570e1ff BJ	145	extern errno;
7c8ab0e6	146
f570e1ff	147	do {
7c8ab0e6 BJ	148	pid = fork();
	149	if(pid == 0) {
	150	/*
	151	alarm(300);
	152	*/
	153	signal(SIGTERM, SIG_DFL);
	154	signal(SIGHUP, SIG_DFL);
	155	signal(SIGALRM, SIG_DFL);
	156	open(ctty, 2);
	157	dup(0);
	158	dup(0);
	159	execl(shell, minus, (char *)0);
	160	exit(0);
	161	}
f570e1ff BJ	162	while((xpid = wait((int *)0)) != pid)
	163	if (xpid == -1 && errno == ECHILD)
	164	break;
	165	} while (xpid == -1);
7c8ab0e6 BJ	166	}
7c8ab0e6 BJ	167
215943cc BJ	168	runcom(oldhowto)
215943cc BJ	169	int oldhowto;
7c8ab0e6 BJ	170	{
7c8ab0e6 BJ	171	register pid, f;
215943cc	172	int status;
7c8ab0e6 BJ	173
	174	pid = fork();
	175	if(pid == 0) {
	176	open("/", 0);
	177	dup(0);
	178	dup(0);
215943cc BJ	179	if (oldhowto & RB_SINGLE)
	180	execl(shell, shell, runc, (char *)0);
	181	else
	182	execl(shell, shell, runc, "autoboot", (char *)0);
	183	exit(1);
7c8ab0e6	184	}
215943cc	185	while(wait(&status) != pid)
7c8ab0e6	186	;
215943cc BJ	187	if(status)
215943cc BJ	188	return(0);
7c8ab0e6 BJ	189	f = open(wtmpf, 1);
	190	if (f >= 0) {
	191	lseek(f, 0L, 2);
	192	SCPYN(wtmp.ut_line, "~");
	193	SCPYN(wtmp.ut_name, "reboot");
f570e1ff BJ	194	if (time0) {
	195	wtmp.ut_time = time0;
	196	time0 = 0;
	197	} else
	198	time(&wtmp.ut_time);
7c8ab0e6 BJ	199	write(f, (char *)&wtmp, sizeof(wtmp));
	200	close(f);
	201	}
215943cc	202	return(1);
7c8ab0e6 BJ	203	}
	204
	205	setmerge()
	206	{
	207
	208	signal(SIGHUP, setmerge);
	209	mergflag = 1;
	210	}
	211
	212	multiple()
	213	{
	214	register struct tab *p;
	215	register pid;
	216
	217	loop:
	218	mergflag = 0;
	219	signal(SIGHUP, setmerge);
	220	for(EVER) {
	221	pid = wait((int *)0);
	222	if(mergflag) {
	223	merge();
	224	goto loop;
	225	}
	226	if(pid == -1)
	227	return;
	228	for(ALL)
	229	if(p->pid == pid \|\| p->pid == -1) {
	230	rmut(p);
	231	dfork(p);
	232	}
	233	}
	234	}
	235
	236	term(p)
	237	register struct tab *p;
	238	{
	239
	240	if(p->pid != 0) {
	241	rmut(p);
	242	kill(p->pid, SIGKILL);
	243	}
	244	p->pid = 0;
	245	}
	246
	247	rline()
	248	{
	249	register c, i;
	250
	251	loop:
	252	c = get();
	253	if(c < 0)
	254	return(0);
	255	if(c == 0)
	256	goto loop;
	257	line.flag = c;
	258	c = get();
	259	if(c <= 0)
	260	goto loop;
	261	line.comn = c;
	262	SCPYN(line.line, "");
	263	for (i=0; i<LINSIZ; i++) {
	264	c = get();
	265	if(c <= 0)
	266	break;
267	line.line[i] = c;
268	}
269	while(c > 0)
270	c = get();
271	if(line.line[0] == 0)
272	goto loop;
273	if(line.flag == '0')
274	goto loop;
275	strcpy(tty, dev);
276	strncat(tty, line.line, LINSIZ);
277	if(access(tty, 06) < 0)
278	goto loop;
279	return(1);
280	}
281
282	get()
283	{
284	char b;
285
286	if(read(fi, &b, 1) != 1)
287	return(-1);
288	if(b == '\n')
289	return(0);
290	return(b);
291	}
292
293	#define FOUND 1
294	#define CHANGE 2
295
296	merge()
297	{
298	register struct tab *p;
299
300	fi = open(ifile, 0);
301	if(fi < 0)
302	return;
303	for(ALL)
304	p->xflag = 0;
305	while(rline()) {
306	for(ALL) {
307	if (SCMPN(p->line, line.line))
308	continue;
309	p->xflag \|= FOUND;
310	if(line.comn != p->comn) {
311	p->xflag \|= CHANGE;
312	p->comn = line.comn;
313	}
314	goto contin1;
315	}
316	for(ALL) {
317	if(p->line[0] != 0)
318	continue;
319	SCPYN(p->line, line.line);
320	p->xflag \|= FOUND\|CHANGE;
321	p->comn = line.comn;
322	goto contin1;
323	}
324	contin1:
325	;
326	}
327	close(fi);
328	for(ALL) {
329	if((p->xflag&FOUND) == 0) {
330	term(p);
331	p->line[0] = 0;
332	}
333	if((p->xflag&CHANGE) != 0) {
334	term(p);
335	dfork(p);
336	}
337	}
338	}
339
30e1f894 SL	340	#include <sys/ioctl.h>
30e1f894 SL	341
7c8ab0e6 BJ	342	dfork(p)
	343	struct tab *p;
	344	{
	345	register pid;
43236707 BJ	346	time_t t;
	347	int dowait = 0;
	348
	349	time(&t);
	350	p->gettycnt++;
	351	if ((t - p->gettytime) >= 60) {
	352	p->gettytime = t;
	353	p->gettycnt = 1;
	354	} else {
	355	if (p->gettycnt >= 5) {
	356	dowait = 1;
	357	p->gettytime = t;
	358	p->gettycnt = 1;
	359	}
	360	}
7c8ab0e6 BJ	361	pid = fork();
7c8ab0e6 BJ	362	if(pid == 0) {
30e1f894 SL	363	int oerrno, f;
	364	extern int errno;
	365
	366	signal(SIGTERM, SIG_DFL);
	367	signal(SIGHUP, SIG_IGN);
43236707	368	if (dowait) {
30e1f894	369	f = open("/dev/console", 1);
43236707 BJ	370	write(f, "init: ", 6);
	371	write(f, tty, strlen(tty));
	372	write(f, ": getty failing, sleeping\n\r", 27);
	373	close(f);
	374	sleep(30);
30e1f894 SL	375	if ((f = open("/dev/tty", 2)) >= 0) {
	376	ioctl(f, TIOCNOTTY, 0);
	377	close(f);
	378	}
43236707	379	}
7c8ab0e6 BJ	380	strcpy(tty, dev);
	381	strncat(tty, p->line, LINSIZ);
	382	chown(tty, 0, 0);
	383	chmod(tty, 0622);
ef9abb5f BJ	384	if (open(tty, 2) < 0) {
	385	int repcnt = 0;
	386	do {
30e1f894	387	oerrno = errno;
ef9abb5f	388	if (repcnt % 10 == 0) {
30e1f894	389	f = open("/dev/console", 1);
ef9abb5f	390	write(f, "init: ", 6);
30e1f894	391	errno = oerrno, perror(tty);
ef9abb5f	392	close(f);
30e1f894 SL	393	if ((f = open("/dev/tty", 2)) >= 0) {
	394	ioctl(f, TIOCNOTTY, 0);
	395	close(f);
	396	}
ef9abb5f BJ	397	}
	398	repcnt++;
	399	sleep(60);
	400	} while (open(tty, 2) < 0);
	401	exit(0); /* have wrong control tty, start over */
	402	}
7c8ab0e6 BJ	403	vhangup();
	404	signal(SIGHUP, SIG_DFL);
	405	open(tty, 2);
	406	close(0);
	407	dup(1);
	408	dup(0);
	409	tty[0] = p->comn;
	410	tty[1] = 0;
	411	execl(getty, minus, tty, (char *)0);
	412	exit(0);
	413	}
	414	p->pid = pid;
	415	}
	416
	417	rmut(p)
	418	register struct tab *p;
	419	{
	420	register f;
ef9abb5f	421	int found = 0;
7c8ab0e6 BJ	422
	423	f = open(utmp, 2);
	424	if(f >= 0) {
	425	while(read(f, (char *)&wtmp, sizeof(wtmp)) == sizeof(wtmp)) {
ef9abb5f	426	if (SCMPN(wtmp.ut_line, p->line) \|\| wtmp.ut_name[0]==0)
7c8ab0e6 BJ	427	continue;
	428	lseek(f, -(long)sizeof(wtmp), 1);
	429	SCPYN(wtmp.ut_name, "");
	430	time(&wtmp.ut_time);
	431	write(f, (char *)&wtmp, sizeof(wtmp));
ef9abb5f	432	found++;
7c8ab0e6 BJ	433	}
	434	close(f);
	435	}
ef9abb5f BJ	436	if (found) {
	437	f = open(wtmpf, 1);
	438	if (f >= 0) {
	439	SCPYN(wtmp.ut_line, p->line);
	440	SCPYN(wtmp.ut_name, "");
	441	time(&wtmp.ut_time);
	442	lseek(f, (long)0, 2);
	443	write(f, (char *)&wtmp, sizeof(wtmp));
	444	close(f);
	445	}
7c8ab0e6 BJ	446	}
	447	}
	448
	449	reset()
	450	{
	451	longjmp(sjbuf, 1);
	452	}
f570e1ff BJ	453
	454	idle()
	455	{
	456	register struct tab *p;
	457	register pid;
	458
	459	signal(SIGTSTP, idle);
	460	for (;;) {
	461	pid = wait((int *) 0);
	462	if (mergflag)
	463	return;
	464	if (pid == -1)
	465	pause();
	466	else {
	467	for (ALL)
	468	if (p->pid == pid) {
	469	rmut(p);
	470	p->pid = -1;
	471	}
	472	}
	473	}
	474	}