NetBSD/sbin/dmesg/dmesg.c

191 lines
4.7 KiB
C

/*-
* Copyright (c) 1991 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1991 The Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */
#ifndef lint
/*static char sccsid[] = "from: @(#)dmesg.c 5.9 (Berkeley) 5/2/91";*/
static char rcsid[] = "$Id: dmesg.c,v 1.5 1993/10/13 18:33:58 jtc Exp $";
#endif /* not lint */
#include <sys/cdefs.h>
#include <sys/msgbuf.h>
#include <time.h>
#include <nlist.h>
#include <kvm.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <unistd.h>
struct nlist nl[] = {
#define X_MSGBUFP 0
{ "_msgbufp" },
{ NULL },
};
void usage(), vputc();
void err __P((const char *, ...));
main(argc, argv)
int argc;
char **argv;
{
register int ch, newl, skip;
register char *p, *ep;
struct msgbuf cur;
int msgbufat;
char *core, *namelist;
core = namelist = NULL;
while ((ch = getopt(argc, argv, "M:N:")) != EOF)
switch(ch) {
case 'M':
core = optarg;
break;
case 'N':
namelist = optarg;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
/* Read in kernel message buffer, do sanity checks. */
if (kvm_openfiles(namelist, core, NULL) == -1)
err("kvm_openfiles: %s", kvm_geterr());
if (kvm_nlist(nl) == -1)
err("kvm_nlist: %s", kvm_geterr());
if (nl[X_MSGBUFP].n_type == 0)
err("msgbufp not found namelist");
kvm_read((void *)nl[X_MSGBUFP].n_value, (void *)&msgbufat, sizeof(msgbufat));
kvm_read((void *)msgbufat, (void *)&cur, sizeof(cur));
if (cur.msg_magic != MSG_MAGIC)
err("magic number incorrect");
if (cur.msg_bufx >= MSG_BSIZE)
cur.msg_bufx = 0;
/*
* The message buffer is circular; start at the read pointer, and
* go to the write pointer - 1.
*/
p = cur.msg_bufc + cur.msg_bufx;
ep = cur.msg_bufc + cur.msg_bufx - 1;
for (newl = skip = 0; p != ep; ++p) {
if (p == cur.msg_bufc + MSG_BSIZE)
p = cur.msg_bufc;
ch = *p;
/* Skip "\n<.*>" syslog sequences. */
if (skip) {
if (ch == '>')
newl = skip = 0;
continue;
}
if (newl && ch == '<') {
skip = 1;
continue;
}
if (ch == '\0')
continue;
newl = (ch = *p) == '\n';
vputc(ch);
}
if (!newl)
(void)putchar('\n');
exit(0);
}
void
vputc(ch)
register int ch;
{
int meta;
if (!isascii(ch)) {
(void)putchar('M');
(void)putchar('-');
ch = toascii(ch);
meta = 1;
} else
meta = 0;
if (isprint(ch) || !meta && (ch == ' ' || ch == '\t' || ch == '\n'))
(void)putchar(ch);
else {
(void)putchar('^');
(void)putchar(ch == '\177' ? '?' : ch | 0100);
}
}
#if __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif
void
#if __STDC__
err(const char *fmt, ...)
#else
err(fmt, va_alist)
char *fmt;
va_dcl
#endif
{
va_list ap;
#if __STDC__
va_start(ap, fmt);
#else
va_start(ap);
#endif
(void)fprintf(stderr, "dmesg: ");
(void)vfprintf(stderr, fmt, ap);
va_end(ap);
(void)fprintf(stderr, "\n");
exit(1);
/* NOTREACHED */
}
void
usage()
{
(void)fprintf(stderr, "usage: dmesg [-M core] [-N system]\n");
exit(1);
}