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

/*-
 * Copyright (c) 1986, 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.proprietary.c%
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1986, 1989 The Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)dmesg.c	5.8 (Berkeley) %G%";
#endif /* not lint */

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

#include <sys/param.h>
#include <sys/signal.h>
#include <sys/file.h>
#include <sys/vm.h>
#include <sys/msgbuf.h>
#include <nlist.h>
#include <stdio.h>
#include "pathnames.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 = 0;

	if (argc>1 && argv[1][0] == '-') {
		sflg++;
		argc--;
		argv++;
	}
	if (sflg) {
		of = open(_PATH_MSGBUF, O_RDWR | O_CREAT, 0644);
		if (of < 0)
			done("Can't open msgbuf file\n");
		read(of, (char *)&omesg, sizeof(omesg));
		lseek(of, 0L, 0);
	}
	sflg = 0;
	nlist(argc>2? argv[2]:_PATH_UNIX, nl);
	if (nl[0].n_type==0)
		done("Can't get kernel namelist\n");
	if ((mem = open((argc>1? argv[1]: _PATH_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;
{
	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
0fc6e47b KB	1	/*-
	2	* Copyright (c) 1986, 1989 The Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* %sccs.include.proprietary.c%
76797561 DF	6	*/
	7
	8	#ifndef lint
0fc6e47b KB	9	char copyright[] =
	10	"@(#) Copyright (c) 1986, 1989 The Regents of the University of California.\n\
	11	All rights reserved.\n";
	12	#endif /* not lint */
	13
	14	#ifndef lint
	15	static char sccsid[] = "@(#)dmesg.c 5.8 (Berkeley) %G%";
	16	#endif /* not lint */
76797561	17
34a7981f BJ	18	/*
	19	* Suck up system messages
	20	* dmesg
	21	* print current buffer
	22	* dmesg -
	23	* print and update incremental history
	24	*/
	25
34a7981f	26	#include <sys/param.h>
a5d34734	27	#include <sys/signal.h>
3b294534	28	#include <sys/file.h>
34a7981f BJ	29	#include <sys/vm.h>
34a7981f BJ	30	#include <sys/msgbuf.h>
a5d34734 KB	31	#include <nlist.h>
	32	#include <stdio.h>
	33	#include "pathnames.h"
34a7981f BJ	34
	35	struct msgbuf msgbuf;
	36	char *msgbufp;
	37	int sflg;
	38	int of = -1;
	39
	40	struct msgbuf omesg;
	41	struct nlist nl[2] = {
	42	{ "_msgbuf" },
c10ca4d6	43	{ "" }
34a7981f BJ	44	};
	45
	46	main(argc, argv)
	47	char **argv;
	48	{
	49	int mem;
	50	register char mp, omp, *mstart;
0c7abeeb	51	int samef, sawnl, ignore = 0;
34a7981f	52
34a7981f BJ	53	if (argc>1 && argv[1][0] == '-') {
	54	sflg++;
	55	argc--;
	56	argv++;
	57	}
	58	if (sflg) {
a5d34734	59	of = open(_PATH_MSGBUF, O_RDWR \| O_CREAT, 0644);
c118b033	60	if (of < 0)
a5d34734	61	done("Can't open msgbuf file\n");
34a7981f BJ	62	read(of, (char *)&omesg, sizeof(omesg));
	63	lseek(of, 0L, 0);
	64	}
	65	sflg = 0;
fa060fb0	66	nlist(argc>2? argv[2]:_PATH_UNIX, nl);
34a7981f	67	if (nl[0].n_type==0)
c118b033	68	done("Can't get kernel namelist\n");
a5d34734	69	if ((mem = open((argc>1? argv[1]: _PATH_KMEM), 0)) < 0)
c118b033	70	done("Can't read kernel memory\n");
34a7981f BJ	71	lseek(mem, (long)nl[0].n_value, 0);
	72	read(mem, &msgbuf, sizeof (msgbuf));
	73	if (msgbuf.msg_magic != MSG_MAGIC)
	74	done("Magic number wrong (namelist mismatch?)\n");
ba25830c MK	75	if (msgbuf.msg_bufx >= MSG_BSIZE)
ba25830c MK	76	msgbuf.msg_bufx = 0;
43a11e0e MK	77	if (omesg.msg_bufx >= MSG_BSIZE)
43a11e0e MK	78	omesg.msg_bufx = 0;
34a7981f BJ	79	mstart = &msgbuf.msg_bufc[omesg.msg_bufx];
	80	omp = &omesg.msg_bufc[msgbuf.msg_bufx];
	81	mp = msgbufp = &msgbuf.msg_bufc[msgbuf.msg_bufx];
	82	samef = 1;
	83	do {
	84	if (mp++ != omp++) {
	85	mstart = msgbufp;
	86	samef = 0;
	87	pdate();
	88	printf("...\n");
	89	break;
	90	}
ba25830c	91	if (mp >= &msgbuf.msg_bufc[MSG_BSIZE])
34a7981f	92	mp = msgbuf.msg_bufc;
ba25830c	93	if (omp >= &omesg.msg_bufc[MSG_BSIZE])
34a7981f BJ	94	omp = omesg.msg_bufc;
	95	} while (mp != mstart);
	96	if (samef && omesg.msg_bufx == msgbuf.msg_bufx)
	97	exit(0);
	98	mp = mstart;
3b294534 MK	99	pdate();
3b294534 MK	100	sawnl = 1;
34a7981f	101	do {
3b294534 MK	102	if (sawnl && *mp == '<')
	103	ignore = 1;
	104	if (mp && (mp & 0200) == 0 && !ignore)
34a7981f	105	putchar(*mp);
3b294534 MK	106	if (ignore && *mp == '>')
	107	ignore = 0;
	108	sawnl = (*mp == '\n');
34a7981f	109	mp++;
ba25830c	110	if (mp >= &msgbuf.msg_bufc[MSG_BSIZE])
34a7981f BJ	111	mp = msgbuf.msg_bufc;
	112	} while (mp != msgbufp);
	113	done((char *)NULL);
	114	}
	115
	116	done(s)
	117	char *s;
	118	{
3b294534	119	if (s) {
34a7981f BJ	120	pdate();
34a7981f BJ	121	printf(s);
3b294534 MK	122	} else if (of != -1)
3b294534 MK	123	write(of, (char *)&msgbuf, sizeof(msgbuf));
34a7981f BJ	124	exit(s!=NULL);
	125	}
	126
	127	pdate()
	128	{
	129	extern char *ctime();
	130	static firstime;
	131	time_t tbuf;
	132
	133	if (firstime==0) {
	134	firstime++;
	135	time(&tbuf);
	136	printf("\n%.12s\n", ctime(&tbuf)+4);
	137	}
	138	}