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

static	char *sccsid = "@(#)savecore.c	4.7 (Berkeley) 81/05/20";
/*
 * savecore
 */

#include <stdio.h>
#include <nlist.h>
#include <sys/param.h>
#include <sys/dir.h>
#include <sys/stat.h>
#include <sys/filsys.h>
#include <time.h>

#define	DAY	(60L*60L*24L)
#define	LEEWAY	(3*DAY)

#define eq(a,b) (!strcmp(a,b))
#define ok(number) ((number)&0x7fffffff)

#define SHUTDOWNLOG "/usr/adm/shutdownlog"

struct nlist nl[] = {
#define X_DUMPDEV	0
	{ "_dumpdev" },
#define X_DUMPLO	1
	{ "_dumplo" },
#define X_TIME		2
	{ "_time" },
#define X_PHYSMEM	3
	{ "_physmem" },
#define X_VERSION	4
	{ "_version" },
#define X_PANICSTR	5
	{ "_panicstr" },
	{ 0 },
};

char	*system;
char	*dirname;			/* directory to save dumps in */
char	*ddname;			/* name of dump device */
char	*find_dev();
dev_t	dumpdev;			/* dump device */
time_t	dumptime;			/* time the dump was taken */
int	dumplo;				/* where dump starts on dumpdev */
int	physmem;			/* amount of memory in machine */
time_t	now;				/* current date */
char	*path();
unsigned malloc();
char	*ctime();
char	vers[80];
char	core_vers[80];
char	panic_mesg[80];
int	panicstr;
off_t	lseek();
off_t	Lseek();

main(argc, argv)
	char **argv;
	int argc;
{

	if (argc != 2 && argc != 3) {
		fprintf(stderr, "usage: savecore dirname [ system ]\n");
		exit(1);
	}
	dirname = argv[1];
	if (argc == 3)
		system = argv[2];
	if (access(dirname, 2) < 0) {
		perror(dirname);
		exit(1);
	}
	(void) time(&now);
	read_kmem();
	log_entry();
	if (get_crashtime() && check_space())
		save_core();
	else
		exit(1);
}

char *
find_dev(dev, type)
	register dev_t dev;
	register int type;
{
	register int dfd = Open("/dev", 0);
	struct direct dir;
	struct stat statb;
	static char devname[DIRSIZ + 1];
	char *dp;

	strcpy(devname, "/dev/");
	while(Read(dfd, (char *)&dir, sizeof dir) > 0) {
		if (dir.d_ino == 0)
			continue;
		strncpy(devname + 5, dir.d_name, DIRSIZ);
		devname[DIRSIZ] = '\0';
		if (stat(devname, &statb)) {
			perror(devname);
			continue;
		}
		if ((statb.st_mode&S_IFMT) != type)
			continue;
		if (dev == statb.st_rdev) {
			close(dfd);
			dp = (char *)malloc(strlen(devname)+1);
			strcpy(dp, devname);
			return dp;
		}
	}
	close(dfd);
	fprintf(stderr, "Can't find device %d,%d\n", major(dev), minor(dev));
	exit(1);
	/*NOTREACHED*/
}

read_kmem()
{
	int kmem;
	FILE *fp;
	register char *cp;

	nlist("/vmunix", nl);
	if (nl[X_DUMPDEV].n_value == 0) {
		fprintf(stderr, "/vmunix: dumpdev not in namelist\n");
		exit(1);
	}
	if (nl[X_DUMPLO].n_value == 0) {
		fprintf(stderr, "/vmunix: dumplo not in namelist\n");
		exit(1);
	}
	if (nl[X_TIME].n_value == 0) {
		fprintf(stderr, "/vmunix: time not in namelist\n");
		exit(1);
	}
	if (nl[X_PHYSMEM].n_value == 0) {
		fprintf(stderr, "/vmunix: physmem not in namelist\n");
		exit(1);
	}
	if (nl[X_VERSION].n_value == 0) {
		fprintf(stderr, "/vmunix: version not in namelist\n");
		exit(1);
	}
	if (nl[X_PANICSTR].n_value == 0) {
		fprintf(stderr, "/vmunix: panicstr not in namelist\n");
		exit(1);
	}
	kmem = Open("/dev/kmem", 0);
	Lseek(kmem, (long)nl[X_DUMPDEV].n_value, 0);
	Read(kmem, (char *)&dumpdev, sizeof dumpdev);
	Lseek(kmem, (long)nl[X_DUMPLO].n_value, 0);
	Read(kmem, (char *)&dumplo, sizeof dumplo);
	Lseek(kmem, (long)nl[X_PHYSMEM].n_value, 0);
	Read(kmem, (char *)&physmem, sizeof physmem);
	dumplo *= 512L;
	ddname = find_dev(dumpdev, S_IFBLK);
	if ((fp = fdopen(kmem, "r")) == NULL) {
		fprintf(stderr, "Couldn't fdopen kmem\n");
		exit(1);
	}
	if (system)
		return;
	fseek(fp, (long)nl[X_VERSION].n_value, 0);
	fgets(vers, sizeof vers, fp);
	fclose(fp);
	if ((fp = fopen(ddname, "r")) == NULL) {
		perror(ddname);
		exit(1);
	}
	fseek(fp, (off_t)(dumplo+ok(nl[X_VERSION].n_value)), 0);
	fgets(core_vers, sizeof core_vers, fp);
	fclose(fp);
	if (!eq(vers, core_vers))
		fprintf(stderr, "Warning: vmunix version mismatch:\n\t%sand\n\t%s",
		    vers,core_vers);
	fp = fopen(ddname, "r");
	fseek(fp, (off_t)(dumplo + ok(nl[X_PANICSTR].n_value)), 0);
	fread((char *)&panicstr, sizeof panicstr, 1, fp);
	if (panicstr) {
		fseek(fp, dumplo + ok(panicstr), 0);
		cp = panic_mesg;
		do
			*cp = getc(fp);
		while (*cp++);
	}
	fclose(fp);
}

get_crashtime()
{
	int dumpfd;
	time_t clobber = (time_t)0;

	if (system)
		return (1);
	dumpfd = Open(ddname, 2);
	Lseek(dumpfd, (off_t)(dumplo + ok(nl[X_TIME].n_value)), 0);
	Read(dumpfd, (char *)&dumptime, sizeof dumptime);
	Lseek(dumpfd, (off_t)(dumplo + ok(nl[X_TIME].n_value)), 0);
	Write(dumpfd, (char *)&clobber, sizeof clobber);
	close(dumpfd);
	if (dumptime == 0) {
#ifdef DEBUG
		printf("dump time is 0\n");
#endif
		return 0;
	}
	printf("System went down at %s", ctime(&dumptime));
	if (dumptime < now - LEEWAY || dumptime > now + LEEWAY) {
		printf("Dump time is unreasonable\n");
		return 0;
	}
	return 1;
}

char *
path(file)
	char *file;
{
	register char *cp = (char *)malloc(strlen(file) + strlen(dirname) + 2);

	(void) strcpy(cp, dirname);
	(void) strcat(cp, "/");
	(void) strcat(cp, file);
	return cp;
}

check_space()
{
	struct stat dsb;
	register char *ddev;
	register int dfd;
	struct filsys sblk;

	if (stat(dirname, &dsb) < 0) {
		perror(dirname);
		exit(1);
	}
	ddev = find_dev(dsb.st_dev, S_IFBLK);
	dfd = Open(ddev, 0);
	Lseek(dfd, 1L<<BSHIFT, 0);
	Read(dfd, (char *)&sblk, sizeof sblk);
	close(dfd);
	if (read_number("minfree") > sblk.s_tfree) {
		fprintf(stderr, "Dump omitted, not enough space on device\n");
		return (0);
	}
	return (1);
}

read_number(fn)
	char *fn;
{
	char lin[80];
	register FILE *fp;

	if ((fp = fopen(path(fn), "r")) == NULL)
		return 0;
	if (fgets(lin, 80, fp) == NULL) {
		fclose(fp);
		return 0;
	}
	fclose(fp);
	return atoi(lin);
}

save_core()
{
	register int n;
	char buffer[32*NBPG];
	register char *cp = buffer;
	register int ifd, ofd, bounds;
	register FILE *fp;

	bounds = read_number("bounds");
	ifd = Open(system?system:"/vmunix", 0);
	ofd = Create(path(sprintf(cp, "vmunix.%d", bounds)), 0666);
	while((n = Read(ifd, cp, BUFSIZ)) > 0)
		Write(ofd, cp, n);
	close(ifd);
	close(ofd);
	ifd = Open(ddname, 0);
	ofd = Create(path(sprintf(cp, "vmcore.%d", bounds)), 0666);
	Lseek(ifd, (off_t)dumplo, 0);
	printf("Saving %d bytes of image in vmcore.%d\n", NBPG*physmem, bounds);
	while(physmem > 0) {
		n = Read(ifd, cp, (physmem > 32 ? 32 : physmem) * NBPG);
		Write(ofd, cp, n);
		physmem -= n/NBPG;
	}
	close(ifd);
	close(ofd);
	fp = fopen(path("bounds"), "w");
	fprintf(fp, "%d\n", bounds+1);
	fclose(fp);
}

char *days[] = {
	"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
};

char *months[] = {
	"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep",
	"Oct", "Nov", "Dec"
};

log_entry()
{
	FILE *fp;
	struct tm *tm, *localtime();

	tm = localtime(&now);
	fp = fopen("/usr/adm/shutdownlog", "a");
	if (fp == 0)
		return;
	fseek(fp, 0L, 2);
	fprintf(fp, "%02d:%02d  %s %s %2d, %4d.  Reboot", tm->tm_hour,
		tm->tm_min, days[tm->tm_wday], months[tm->tm_mon],
		tm->tm_mday, tm->tm_year + 1900);
	if (panicstr)
		fprintf(fp, " after panic: %s\n", panic_mesg);
	else
		putc('\n', fp);
	fclose(fp);
}

/*
 * Versions of std routines that exit on error.
 */

Open(name, rw)
	char *name;
	int rw;
{
	int fd;

	if ((fd = open(name, rw)) < 0) {
		perror(name);
		exit(1);
	}
	return fd;
}

Read(fd, buff, size)
	int fd, size;
	char *buff;
{
	int ret;

	if ((ret = read(fd, buff, size)) < 0) {
		perror("read");
		exit(1);
	}
	return ret;
}

off_t
Lseek(fd, off, flag)
	int fd, flag;
	long off;
{
	long ret;

	if ((ret = lseek(fd, off, flag)) == -1L) {
		perror("lseek");
		exit(1);
	}
	return ret;
}

Create(file, mode)
	char *file;
	int mode;
{
	register int fd;

	if ((fd = creat(file, mode)) < 0) {
		perror(file);
		exit(1);
	}
	return fd;
}

Write(fd, buf, size)
	int fd, size;
	char *buf;

{

	if (write(fd, buf, size) < size) {
		perror("write");
		exit(1);
	}
}
Commit	Line	Data
f6cc4b0d	1	static char *sccsid = "@(#)savecore.c 4.7 (Berkeley) 81/05/20";
d112e9ff	2	/*
97d6da0b	3	* savecore
d112e9ff BJ	4	*/
	5
	6	#include <stdio.h>
	7	#include <nlist.h>
	8	#include <sys/param.h>
	9	#include <sys/dir.h>
	10	#include <sys/stat.h>
	11	#include <sys/filsys.h>
	12	#include <time.h>
	13
97d6da0b BJ	14	#define DAY (60L60L24L)
	15	#define LEEWAY (3*DAY)
	16
	17	#define eq(a,b) (!strcmp(a,b))
	18	#define ok(number) ((number)&0x7fffffff)
	19
d112e9ff	20	#define SHUTDOWNLOG "/usr/adm/shutdownlog"
d112e9ff BJ	21
	22	struct nlist nl[] = {
	23	#define X_DUMPDEV 0
	24	{ "_dumpdev" },
	25	#define X_DUMPLO 1
	26	{ "_dumplo" },
	27	#define X_TIME 2
	28	{ "_time" },
	29	#define X_PHYSMEM 3
	30	{ "_physmem" },
	31	#define X_VERSION 4
	32	{ "_version" },
	33	#define X_PANICSTR 5
	34	{ "_panicstr" },
	35	{ 0 },
	36	};
	37
f6cc4b0d	38	char *system;
97d6da0b BJ	39	char dirname; / directory to save dumps in */
	40	char ddname; / name of dump device */
	41	char *find_dev();
	42	dev_t dumpdev; /* dump device */
	43	time_t dumptime; /* time the dump was taken */
	44	int dumplo; /* where dump starts on dumpdev */
	45	int physmem; /* amount of memory in machine */
	46	time_t now; /* current date */
	47	char *path();
	48	unsigned malloc();
	49	char *ctime();
	50	char vers[80];
	51	char core_vers[80];
	52	char panic_mesg[80];
	53	int panicstr;
97d6da0b BJ	54	off_t lseek();
97d6da0b BJ	55	off_t Lseek();
d112e9ff BJ	56
d112e9ff BJ	57	main(argc, argv)
97d6da0b BJ	58	char **argv;
97d6da0b BJ	59	int argc;
d112e9ff	60	{
97d6da0b	61
f6cc4b0d BJ	62	if (argc != 2 && argc != 3) {
f6cc4b0d BJ	63	fprintf(stderr, "usage: savecore dirname [ system ]\n");
d112e9ff BJ	64	exit(1);
	65	}
	66	dirname = argv[1];
f6cc4b0d BJ	67	if (argc == 3)
f6cc4b0d BJ	68	system = argv[2];
97d6da0b	69	if (access(dirname, 2) < 0) {
d112e9ff	70	perror(dirname);
97d6da0b	71	exit(1);
d112e9ff	72	}
97d6da0b	73	(void) time(&now);
d112e9ff BJ	74	read_kmem();
d112e9ff BJ	75	log_entry();
c190b305	76	if (get_crashtime() && check_space())
d112e9ff	77	save_core();
c190b305 BJ	78	else
c190b305 BJ	79	exit(1);
d112e9ff BJ	80	}
d112e9ff BJ	81
97d6da0b BJ	82	char *
	83	find_dev(dev, type)
	84	register dev_t dev;
	85	register int type;
d112e9ff BJ	86	{
	87	register int dfd = Open("/dev", 0);
	88	struct direct dir;
	89	struct stat statb;
	90	static char devname[DIRSIZ + 1];
f0326588	91	char *dp;
d112e9ff BJ	92
d112e9ff BJ	93	strcpy(devname, "/dev/");
97d6da0b	94	while(Read(dfd, (char *)&dir, sizeof dir) > 0) {
d112e9ff BJ	95	if (dir.d_ino == 0)
	96	continue;
	97	strncpy(devname + 5, dir.d_name, DIRSIZ);
	98	devname[DIRSIZ] = '\0';
97d6da0b	99	if (stat(devname, &statb)) {
d112e9ff	100	perror(devname);
97d6da0b BJ	101	continue;
	102	}
	103	if ((statb.st_mode&S_IFMT) != type)
	104	continue;
	105	if (dev == statb.st_rdev) {
	106	close(dfd);
	107	dp = (char *)malloc(strlen(devname)+1);
	108	strcpy(dp, devname);
	109	return dp;
d112e9ff BJ	110	}
	111	}
	112	close(dfd);
	113	fprintf(stderr, "Can't find device %d,%d\n", major(dev), minor(dev));
97d6da0b BJ	114	exit(1);
97d6da0b BJ	115	/NOTREACHED/
d112e9ff BJ	116	}
d112e9ff BJ	117
d112e9ff BJ	118	read_kmem()
	119	{
	120	int kmem;
	121	FILE *fp;
	122	register char *cp;
	123
	124	nlist("/vmunix", nl);
97d6da0b BJ	125	if (nl[X_DUMPDEV].n_value == 0) {
	126	fprintf(stderr, "/vmunix: dumpdev not in namelist\n");
	127	exit(1);
d112e9ff	128	}
97d6da0b BJ	129	if (nl[X_DUMPLO].n_value == 0) {
	130	fprintf(stderr, "/vmunix: dumplo not in namelist\n");
	131	exit(1);
d112e9ff	132	}
97d6da0b BJ	133	if (nl[X_TIME].n_value == 0) {
	134	fprintf(stderr, "/vmunix: time not in namelist\n");
	135	exit(1);
d112e9ff	136	}
97d6da0b BJ	137	if (nl[X_PHYSMEM].n_value == 0) {
	138	fprintf(stderr, "/vmunix: physmem not in namelist\n");
	139	exit(1);
d112e9ff	140	}
97d6da0b BJ	141	if (nl[X_VERSION].n_value == 0) {
	142	fprintf(stderr, "/vmunix: version not in namelist\n");
	143	exit(1);
d112e9ff	144	}
97d6da0b BJ	145	if (nl[X_PANICSTR].n_value == 0) {
	146	fprintf(stderr, "/vmunix: panicstr not in namelist\n");
	147	exit(1);
d112e9ff BJ	148	}
d112e9ff BJ	149	kmem = Open("/dev/kmem", 0);
97d6da0b BJ	150	Lseek(kmem, (long)nl[X_DUMPDEV].n_value, 0);
	151	Read(kmem, (char *)&dumpdev, sizeof dumpdev);
	152	Lseek(kmem, (long)nl[X_DUMPLO].n_value, 0);
	153	Read(kmem, (char *)&dumplo, sizeof dumplo);
	154	Lseek(kmem, (long)nl[X_PHYSMEM].n_value, 0);
	155	Read(kmem, (char *)&physmem, sizeof physmem);
d112e9ff BJ	156	dumplo *= 512L;
d112e9ff BJ	157	ddname = find_dev(dumpdev, S_IFBLK);
97d6da0b	158	if ((fp = fdopen(kmem, "r")) == NULL) {
d112e9ff	159	fprintf(stderr, "Couldn't fdopen kmem\n");
97d6da0b	160	exit(1);
d112e9ff	161	}
f6cc4b0d BJ	162	if (system)
f6cc4b0d BJ	163	return;
97d6da0b	164	fseek(fp, (long)nl[X_VERSION].n_value, 0);
d112e9ff BJ	165	fgets(vers, sizeof vers, fp);
d112e9ff BJ	166	fclose(fp);
97d6da0b	167	if ((fp = fopen(ddname, "r")) == NULL) {
d112e9ff	168	perror(ddname);
97d6da0b	169	exit(1);
d112e9ff	170	}
97d6da0b	171	fseek(fp, (off_t)(dumplo+ok(nl[X_VERSION].n_value)), 0);
d112e9ff BJ	172	fgets(core_vers, sizeof core_vers, fp);
d112e9ff BJ	173	fclose(fp);
40dd70fc BJ	174	if (!eq(vers, core_vers))
40dd70fc BJ	175	fprintf(stderr, "Warning: vmunix version mismatch:\n\t%sand\n\t%s",
97d6da0b	176	vers,core_vers);
97d6da0b BJ	177	fp = fopen(ddname, "r");
	178	fseek(fp, (off_t)(dumplo + ok(nl[X_PANICSTR].n_value)), 0);
	179	fread((char *)&panicstr, sizeof panicstr, 1, fp);
	180	if (panicstr) {
	181	fseek(fp, dumplo + ok(panicstr), 0);
d112e9ff BJ	182	cp = panic_mesg;
	183	do
	184	*cp = getc(fp);
	185	while (*cp++);
d112e9ff	186	}
97d6da0b	187	fclose(fp);
f6cc4b0d	188	}
d112e9ff	189
97d6da0b BJ	190	get_crashtime()
97d6da0b BJ	191	{
d112e9ff	192	int dumpfd;
20f89b8d	193	time_t clobber = (time_t)0;
d112e9ff	194
f6cc4b0d BJ	195	if (system)
f6cc4b0d BJ	196	return (1);
20f89b8d	197	dumpfd = Open(ddname, 2);
97d6da0b BJ	198	Lseek(dumpfd, (off_t)(dumplo + ok(nl[X_TIME].n_value)), 0);
	199	Read(dumpfd, (char *)&dumptime, sizeof dumptime);
	200	Lseek(dumpfd, (off_t)(dumplo + ok(nl[X_TIME].n_value)), 0);
	201	Write(dumpfd, (char *)&clobber, sizeof clobber);
d112e9ff	202	close(dumpfd);
c190b305 BJ	203	if (dumptime == 0) {
	204	#ifdef DEBUG
	205	printf("dump time is 0\n");
	206	#endif
97d6da0b	207	return 0;
c190b305	208	}
d112e9ff BJ	209	printf("System went down at %s", ctime(&dumptime));
	210	if (dumptime < now - LEEWAY \|\| dumptime > now + LEEWAY) {
	211	printf("Dump time is unreasonable\n");
97d6da0b	212	return 0;
d112e9ff	213	}
97d6da0b	214	return 1;
d112e9ff BJ	215	}
d112e9ff BJ	216
97d6da0b BJ	217	char *
	218	path(file)
	219	char *file;
d112e9ff	220	{
97d6da0b	221	register char cp = (char )malloc(strlen(file) + strlen(dirname) + 2);
d112e9ff	222
97d6da0b BJ	223	(void) strcpy(cp, dirname);
	224	(void) strcat(cp, "/");
	225	(void) strcat(cp, file);
d112e9ff BJ	226	return cp;
	227	}
	228
d112e9ff BJ	229	check_space()
	230	{
	231	struct stat dsb;
	232	register char *ddev;
	233	register int dfd;
	234	struct filsys sblk;
	235
97d6da0b BJ	236	if (stat(dirname, &dsb) < 0) {
	237	perror(dirname);
	238	exit(1);
	239	}
d112e9ff BJ	240	ddev = find_dev(dsb.st_dev, S_IFBLK);
	241	dfd = Open(ddev, 0);
	242	Lseek(dfd, 1L<<BSHIFT, 0);
97d6da0b	243	Read(dfd, (char *)&sblk, sizeof sblk);
d112e9ff	244	close(dfd);
97d6da0b BJ	245	if (read_number("minfree") > sblk.s_tfree) {
	246	fprintf(stderr, "Dump omitted, not enough space on device\n");
	247	return (0);
d112e9ff	248	}
97d6da0b	249	return (1);
d112e9ff BJ	250	}
d112e9ff BJ	251
d112e9ff	252	read_number(fn)
97d6da0b	253	char *fn;
d112e9ff BJ	254	{
	255	char lin[80];
	256	register FILE *fp;
	257
	258	if ((fp = fopen(path(fn), "r")) == NULL)
	259	return 0;
97d6da0b BJ	260	if (fgets(lin, 80, fp) == NULL) {
	261	fclose(fp);
	262	return 0;
d112e9ff	263	}
97d6da0b BJ	264	fclose(fp);
97d6da0b BJ	265	return atoi(lin);
d112e9ff BJ	266	}
	267
	268	save_core()
	269	{
	270	register int n;
97d6da0b	271	char buffer[32*NBPG];
d112e9ff BJ	272	register char *cp = buffer;
	273	register int ifd, ofd, bounds;
	274	register FILE *fp;
	275
	276	bounds = read_number("bounds");
f6cc4b0d	277	ifd = Open(system?system:"/vmunix", 0);
d112e9ff BJ	278	ofd = Create(path(sprintf(cp, "vmunix.%d", bounds)), 0666);
	279	while((n = Read(ifd, cp, BUFSIZ)) > 0)
	280	Write(ofd, cp, n);
	281	close(ifd);
	282	close(ofd);
d112e9ff BJ	283	ifd = Open(ddname, 0);
d112e9ff BJ	284	ofd = Create(path(sprintf(cp, "vmcore.%d", bounds)), 0666);
97d6da0b BJ	285	Lseek(ifd, (off_t)dumplo, 0);
	286	printf("Saving %d bytes of image in vmcore.%d\n", NBPG*physmem, bounds);
	287	while(physmem > 0) {
	288	n = Read(ifd, cp, (physmem > 32 ? 32 : physmem) * NBPG);
d112e9ff BJ	289	Write(ofd, cp, n);
	290	physmem -= n/NBPG;
	291	}
	292	close(ifd);
	293	close(ofd);
	294	fp = fopen(path("bounds"), "w");
	295	fprintf(fp, "%d\n", bounds+1);
	296	fclose(fp);
	297	}
	298
	299	char *days[] = {
	300	"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
	301	};
	302
	303	char *months[] = {
	304	"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep",
	305	"Oct", "Nov", "Dec"
	306	};
	307
	308	log_entry()
	309	{
	310	FILE *fp;
	311	struct tm tm, localtime();
	312
	313	tm = localtime(&now);
97d6da0b BJ	314	fp = fopen("/usr/adm/shutdownlog", "a");
	315	if (fp == 0)
	316	return;
d112e9ff BJ	317	fseek(fp, 0L, 2);
	318	fprintf(fp, "%02d:%02d %s %s %2d, %4d. Reboot", tm->tm_hour,
	319	tm->tm_min, days[tm->tm_wday], months[tm->tm_mon],
	320	tm->tm_mday, tm->tm_year + 1900);
	321	if (panicstr)
97d6da0b	322	fprintf(fp, " after panic: %s\n", panic_mesg);
d112e9ff BJ	323	else
	324	putc('\n', fp);
	325	fclose(fp);
	326	}
97d6da0b BJ	327
	328	/*
	329	* Versions of std routines that exit on error.
	330	*/
	331
	332	Open(name, rw)
	333	char *name;
	334	int rw;
	335	{
	336	int fd;
	337
	338	if ((fd = open(name, rw)) < 0) {
	339	perror(name);
	340	exit(1);
	341	}
	342	return fd;
	343	}
	344
	345	Read(fd, buff, size)
	346	int fd, size;
	347	char *buff;
	348	{
	349	int ret;
	350
	351	if ((ret = read(fd, buff, size)) < 0) {
	352	perror("read");
	353	exit(1);
	354	}
	355	return ret;
	356	}
	357
	358	off_t
	359	Lseek(fd, off, flag)
	360	int fd, flag;
	361	long off;
	362	{
	363	long ret;
	364
	365	if ((ret = lseek(fd, off, flag)) == -1L) {
	366	perror("lseek");
	367	exit(1);
	368	}
	369	return ret;
	370	}
	371
	372	Create(file, mode)
	373	char *file;
	374	int mode;
	375	{
	376	register int fd;
	377
	378	if ((fd = creat(file, mode)) < 0) {
	379	perror(file);
	380	exit(1);
	381	}
	382	return fd;
	383	}
	384
	385	Write(fd, buf, size)
	386	int fd, size;
	387	char *buf;
	388
	389	{
	390
391	if (write(fd, buf, size) < size) {
392	perror("write");
393	exit(1);
394	}
395	}