[unix-history] / usr / src / sbin / dmesg / dmesg.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
static char sccsid[] = "@(#)dmesg.c	5.4 (Berkeley) %G%";
#endif not lint

/*
 *	Suck up system messages
 *	dmesg
 *		print current buffer
 *	dmesg -
 *		print and update incremental history
 */

#include <stdio.h>
#include <sys/param.h>
#include <nlist.h>
#include <signal.h>
#include <sys/file.h>
#include <sys/vm.h>
#include <sys/msgbuf.h>

struct	msgbuf msgbuf;
char	*msgbufp;
int	sflg;
int	of	= -1;

struct	msgbuf omesg;
struct	nlist nl[2] = {
	{ "_msgbuf" },
	{ "" }
};

main(argc, argv)
char **argv;
{
	int mem;
	register char *mp, *omp, *mstart;
	int samef, sawnl, ignore;

	if (argc>1 && argv[1][0] == '-') {
		sflg++;
		argc--;
		argv++;
	}
	if (sflg) {
		of = open("/usr/adm/msgbuf", O_RDWR | O_CREAT, 0644);
		if (of < 0)
			done("Can't open /usr/adm/msgbuf\n");
		read(of, (char *)&omesg, sizeof(omesg));
		lseek(of, 0L, 0);
	}
	sflg = 0;
	nlist(argc>2? argv[2]:"/vmunix", nl);
	if (nl[0].n_type==0)
		done("Can't get kernel namelist\n");
	if ((mem = open((argc>1? argv[1]: "/dev/kmem"), 0)) < 0)
		done("Can't read kernel memory\n");
	lseek(mem, (long)nl[0].n_value, 0);
	read(mem, &msgbuf, sizeof (msgbuf));
	if (msgbuf.msg_magic != MSG_MAGIC)
		done("Magic number wrong (namelist mismatch?)\n");
	if (msgbuf.msg_bufx >= MSG_BSIZE)
		msgbuf.msg_bufx = 0;
	if (omesg.msg_bufx >= MSG_BSIZE)
		omesg.msg_bufx = 0;
	mstart = &msgbuf.msg_bufc[omesg.msg_bufx];
	omp = &omesg.msg_bufc[msgbuf.msg_bufx];
	mp = msgbufp = &msgbuf.msg_bufc[msgbuf.msg_bufx];
	samef = 1;
	do {
		if (*mp++ != *omp++) {
			mstart = msgbufp;
			samef = 0;
			pdate();
			printf("...\n");
			break;
		}
		if (mp >= &msgbuf.msg_bufc[MSG_BSIZE])
			mp = msgbuf.msg_bufc;
		if (omp >= &omesg.msg_bufc[MSG_BSIZE])
			omp = omesg.msg_bufc;
	} while (mp != mstart);
	if (samef && omesg.msg_bufx == msgbuf.msg_bufx)
		exit(0);
	mp = mstart;
	pdate();
	sawnl = 1;
	do {
		if (sawnl && *mp == '<')
			ignore = 1;
		if (*mp && (*mp & 0200) == 0 && !ignore)
			putchar(*mp);
		if (ignore && *mp == '>')
			ignore = 0;
		sawnl = (*mp == '\n');
		mp++;
		if (mp >= &msgbuf.msg_bufc[MSG_BSIZE])
			mp = msgbuf.msg_bufc;
	} while (mp != msgbufp);
	done((char *)NULL);
}

done(s)
char *s;
{
	register char *p, *q;

	if (s) {
		pdate();
		printf(s);
	} else if (of != -1)
		write(of, (char *)&msgbuf, sizeof(msgbuf));
	exit(s!=NULL);
}

pdate()
{
	extern char *ctime();
	static firstime;
	time_t tbuf;

	if (firstime==0) {
		firstime++;
		time(&tbuf);
		printf("\n%.12s\n", ctime(&tbuf)+4);
	}
}
Commit	Line	Data
76797561 DF	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
43a11e0e	8	static char sccsid[] = "@(#)dmesg.c 5.4 (Berkeley) %G%";
76797561 DF	9	#endif not lint
76797561 DF	10
34a7981f BJ	11	/*
	12	* Suck up system messages
	13	* dmesg
	14	* print current buffer
	15	* dmesg -
	16	* print and update incremental history
	17	*/
	18
	19	#include <stdio.h>
	20	#include <sys/param.h>
	21	#include <nlist.h>
	22	#include <signal.h>
3b294534	23	#include <sys/file.h>
34a7981f BJ	24	#include <sys/vm.h>
	25	#include <sys/msgbuf.h>
	26
	27	struct msgbuf msgbuf;
	28	char *msgbufp;
	29	int sflg;
	30	int of = -1;
	31
	32	struct msgbuf omesg;
	33	struct nlist nl[2] = {
	34	{ "_msgbuf" },
c10ca4d6	35	{ "" }
34a7981f BJ	36	};
	37
	38	main(argc, argv)
	39	char **argv;
	40	{
	41	int mem;
	42	register char mp, omp, *mstart;
3b294534	43	int samef, sawnl, ignore;
34a7981f	44
34a7981f BJ	45	if (argc>1 && argv[1][0] == '-') {
	46	sflg++;
	47	argc--;
	48	argv++;
	49	}
	50	if (sflg) {
3b294534	51	of = open("/usr/adm/msgbuf", O_RDWR \| O_CREAT, 0644);
c118b033 S	52	if (of < 0)
c118b033 S	53	done("Can't open /usr/adm/msgbuf\n");
34a7981f BJ	54	read(of, (char *)&omesg, sizeof(omesg));
	55	lseek(of, 0L, 0);
	56	}
	57	sflg = 0;
	58	nlist(argc>2? argv[2]:"/vmunix", nl);
	59	if (nl[0].n_type==0)
c118b033	60	done("Can't get kernel namelist\n");
34a7981f	61	if ((mem = open((argc>1? argv[1]: "/dev/kmem"), 0)) < 0)
c118b033	62	done("Can't read kernel memory\n");
34a7981f BJ	63	lseek(mem, (long)nl[0].n_value, 0);
	64	read(mem, &msgbuf, sizeof (msgbuf));
	65	if (msgbuf.msg_magic != MSG_MAGIC)
	66	done("Magic number wrong (namelist mismatch?)\n");
ba25830c MK	67	if (msgbuf.msg_bufx >= MSG_BSIZE)
ba25830c MK	68	msgbuf.msg_bufx = 0;
43a11e0e MK	69	if (omesg.msg_bufx >= MSG_BSIZE)
43a11e0e MK	70	omesg.msg_bufx = 0;
34a7981f BJ	71	mstart = &msgbuf.msg_bufc[omesg.msg_bufx];
	72	omp = &omesg.msg_bufc[msgbuf.msg_bufx];
	73	mp = msgbufp = &msgbuf.msg_bufc[msgbuf.msg_bufx];
	74	samef = 1;
	75	do {
	76	if (mp++ != omp++) {
	77	mstart = msgbufp;
	78	samef = 0;
	79	pdate();
	80	printf("...\n");
	81	break;
	82	}
ba25830c	83	if (mp >= &msgbuf.msg_bufc[MSG_BSIZE])
34a7981f	84	mp = msgbuf.msg_bufc;
ba25830c	85	if (omp >= &omesg.msg_bufc[MSG_BSIZE])
34a7981f BJ	86	omp = omesg.msg_bufc;
	87	} while (mp != mstart);
	88	if (samef && omesg.msg_bufx == msgbuf.msg_bufx)
	89	exit(0);
	90	mp = mstart;
3b294534 MK	91	pdate();
3b294534 MK	92	sawnl = 1;
34a7981f	93	do {
3b294534 MK	94	if (sawnl && *mp == '<')
	95	ignore = 1;
	96	if (mp && (mp & 0200) == 0 && !ignore)
34a7981f	97	putchar(*mp);
3b294534 MK	98	if (ignore && *mp == '>')
	99	ignore = 0;
	100	sawnl = (*mp == '\n');
34a7981f	101	mp++;
ba25830c	102	if (mp >= &msgbuf.msg_bufc[MSG_BSIZE])
34a7981f BJ	103	mp = msgbuf.msg_bufc;
	104	} while (mp != msgbufp);
	105	done((char *)NULL);
	106	}
	107
	108	done(s)
	109	char *s;
	110	{
	111	register char p, q;
	112
3b294534	113	if (s) {
34a7981f BJ	114	pdate();
34a7981f BJ	115	printf(s);
3b294534 MK	116	} else if (of != -1)
3b294534 MK	117	write(of, (char *)&msgbuf, sizeof(msgbuf));
34a7981f BJ	118	exit(s!=NULL);
	119	}
	120
	121	pdate()
	122	{
	123	extern char *ctime();
	124	static firstime;
	125	time_t tbuf;
	126
	127	if (firstime==0) {
	128	firstime++;
	129	time(&tbuf);
	130	printf("\n%.12s\n", ctime(&tbuf)+4);
	131	}
	132	}