1 /*- 2 * Copyright (c) 1991 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 char copyright[] = 36 "@(#) Copyright (c) 1991 The Regents of the University of California.\n\ 37 All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 /*static char sccsid[] = "from: @(#)dmesg.c 5.9 (Berkeley) 5/2/91";*/ 42 static char rcsid[] = "$Id: dmesg.c,v 1.5 1993/10/13 18:33:58 jtc Exp $"; 43 #endif /* not lint */ 44 45 #include <sys/cdefs.h> 46 #include <sys/msgbuf.h> 47 #include <time.h> 48 #include <nlist.h> 49 #include <kvm.h> 50 #include <stdlib.h> 51 #include <stdio.h> 52 #include <ctype.h> 53 #include <unistd.h> 54 55 struct nlist nl[] = { 56 #define X_MSGBUFP 0 57 { "_msgbufp" }, 58 { NULL }, 59 }; 60 61 void usage(), vputc(); 62 void err __P((const char *, ...)); 63 64 main(argc, argv) 65 int argc; 66 char **argv; 67 { 68 register int ch, newl, skip; 69 register char *p, *ep; 70 struct msgbuf cur; 71 int msgbufat; 72 char *core, *namelist; 73 74 core = namelist = NULL; 75 while ((ch = getopt(argc, argv, "M:N:")) != EOF) 76 switch(ch) { 77 case 'M': 78 core = optarg; 79 break; 80 case 'N': 81 namelist = optarg; 82 break; 83 case '?': 84 default: 85 usage(); 86 } 87 argc -= optind; 88 argv += optind; 89 90 /* Read in kernel message buffer, do sanity checks. */ 91 if (kvm_openfiles(namelist, core, NULL) == -1) 92 err("kvm_openfiles: %s", kvm_geterr()); 93 if (kvm_nlist(nl) == -1) 94 err("kvm_nlist: %s", kvm_geterr()); 95 if (nl[X_MSGBUFP].n_type == 0) 96 err("msgbufp not found namelist"); 97 98 kvm_read((void *)nl[X_MSGBUFP].n_value, (void *)&msgbufat, sizeof(msgbufat)); 99 kvm_read((void *)msgbufat, (void *)&cur, sizeof(cur)); 100 if (cur.msg_magic != MSG_MAGIC) 101 err("magic number incorrect"); 102 if (cur.msg_bufx >= MSG_BSIZE) 103 cur.msg_bufx = 0; 104 105 /* 106 * The message buffer is circular; start at the read pointer, and 107 * go to the write pointer - 1. 108 */ 109 p = cur.msg_bufc + cur.msg_bufx; 110 ep = cur.msg_bufc + cur.msg_bufx - 1; 111 for (newl = skip = 0; p != ep; ++p) { 112 if (p == cur.msg_bufc + MSG_BSIZE) 113 p = cur.msg_bufc; 114 ch = *p; 115 /* Skip "\n<.*>" syslog sequences. */ 116 if (skip) { 117 if (ch == '>') 118 newl = skip = 0; 119 continue; 120 } 121 if (newl && ch == '<') { 122 skip = 1; 123 continue; 124 } 125 if (ch == '\0') 126 continue; 127 newl = (ch = *p) == '\n'; 128 vputc(ch); 129 } 130 if (!newl) 131 (void)putchar('\n'); 132 exit(0); 133 } 134 135 void 136 vputc(ch) 137 register int ch; 138 { 139 int meta; 140 141 if (!isascii(ch)) { 142 (void)putchar('M'); 143 (void)putchar('-'); 144 ch = toascii(ch); 145 meta = 1; 146 } else 147 meta = 0; 148 if (isprint(ch) || !meta && (ch == ' ' || ch == '\t' || ch == '\n')) 149 (void)putchar(ch); 150 else { 151 (void)putchar('^'); 152 (void)putchar(ch == '\177' ? '?' : ch | 0100); 153 } 154 } 155 156 #if __STDC__ 157 #include <stdarg.h> 158 #else 159 #include <varargs.h> 160 #endif 161 162 void 163 #if __STDC__ 164 err(const char *fmt, ...) 165 #else 166 err(fmt, va_alist) 167 char *fmt; 168 va_dcl 169 #endif 170 { 171 va_list ap; 172 #if __STDC__ 173 va_start(ap, fmt); 174 #else 175 va_start(ap); 176 #endif 177 (void)fprintf(stderr, "dmesg: "); 178 (void)vfprintf(stderr, fmt, ap); 179 va_end(ap); 180 (void)fprintf(stderr, "\n"); 181 exit(1); 182 /* NOTREACHED */ 183 } 184 185 void 186 usage() 187 { 188 (void)fprintf(stderr, "usage: dmesg [-M core] [-N system]\n"); 189 exit(1); 190 } 191