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c17a1afc WJ |
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[] = "@(#)dmesg.c 5.9 (Berkeley) 5/2/91"; | |
42 | #endif /* not lint */ | |
43 | ||
44 | #include <sys/cdefs.h> | |
45 | #include <sys/msgbuf.h> | |
46 | #include <time.h> | |
47 | #include <nlist.h> | |
48 | #include <kvm.h> | |
49 | #include <stdlib.h> | |
50 | #include <stdio.h> | |
51 | #include <ctype.h> | |
52 | ||
53 | struct nlist nl[] = { | |
54 | #define X_MSGBUFP 0 | |
55 | { "_msgbufp" }, | |
56 | { NULL }, | |
57 | }; | |
58 | ||
59 | void usage(), vputc(); | |
60 | void err __P((const char *, ...)); | |
61 | ||
62 | main(argc, argv) | |
63 | int argc; | |
64 | char **argv; | |
65 | { | |
66 | register int ch, newl, skip; | |
67 | register char *p, *ep; | |
68 | struct msgbuf cur; | |
69 | int msgbufat; | |
70 | char *core, *namelist; | |
71 | ||
72 | core = namelist = NULL; | |
73 | while ((ch = getopt(argc, argv, "M:N:")) != EOF) | |
74 | switch(ch) { | |
75 | case 'M': | |
76 | core = optarg; | |
77 | break; | |
78 | case 'N': | |
79 | namelist = optarg; | |
80 | break; | |
81 | case '?': | |
82 | default: | |
83 | usage(); | |
84 | } | |
85 | argc -= optind; | |
86 | argv += optind; | |
87 | ||
88 | /* Read in kernel message buffer, do sanity checks. */ | |
89 | if (kvm_openfiles(namelist, core, NULL) == -1) | |
90 | err("kvm_openfiles: %s", kvm_geterr()); | |
91 | if (kvm_nlist(nl) == -1) | |
92 | err("kvm_nlist: %s", kvm_geterr()); | |
93 | if (nl[X_MSGBUFP].n_type == 0) | |
94 | err("msgbufp not found namelist"); | |
95 | ||
96 | kvm_read((void *)nl[X_MSGBUFP].n_value, (void *)&msgbufat, sizeof(msgbufat)); | |
97 | kvm_read((void *)msgbufat, (void *)&cur, sizeof(cur)); | |
98 | if (cur.msg_magic != MSG_MAGIC) | |
99 | err("magic number incorrect"); | |
100 | if (cur.msg_bufx >= MSG_BSIZE) | |
101 | cur.msg_bufx = 0; | |
102 | ||
103 | /* | |
104 | * The message buffer is circular; start at the read pointer, and | |
105 | * go to the write pointer - 1. | |
106 | */ | |
107 | p = cur.msg_bufc + cur.msg_bufx; | |
108 | ep = cur.msg_bufc + cur.msg_bufx - 1; | |
109 | for (newl = skip = 0; p != ep; ++p) { | |
110 | if (p == cur.msg_bufc + MSG_BSIZE) | |
111 | p = cur.msg_bufc; | |
112 | ch = *p; | |
113 | /* Skip "\n<.*>" syslog sequences. */ | |
114 | if (skip) { | |
115 | if (ch == '>') | |
116 | newl = skip = 0; | |
117 | continue; | |
118 | } | |
119 | if (newl && ch == '<') { | |
120 | skip = 1; | |
121 | continue; | |
122 | } | |
123 | if (ch == '\0') | |
124 | continue; | |
125 | newl = (ch = *p) == '\n'; | |
126 | vputc(ch); | |
127 | } | |
128 | if (!newl) | |
129 | (void)putchar('\n'); | |
130 | exit(0); | |
131 | } | |
132 | ||
133 | void | |
134 | vputc(ch) | |
135 | register int ch; | |
136 | { | |
137 | int meta; | |
138 | ||
139 | if (!isascii(ch)) { | |
140 | (void)putchar('M'); | |
141 | (void)putchar('-'); | |
142 | ch = toascii(ch); | |
143 | meta = 1; | |
144 | } else | |
145 | meta = 0; | |
146 | if (isprint(ch) || !meta && (ch == ' ' || ch == '\t' || ch == '\n')) | |
147 | (void)putchar(ch); | |
148 | else { | |
149 | (void)putchar('^'); | |
150 | (void)putchar(ch == '\177' ? '?' : ch | 0100); | |
151 | } | |
152 | } | |
153 | ||
154 | #if __STDC__ | |
155 | #include <stdarg.h> | |
156 | #else | |
157 | #include <varargs.h> | |
158 | #endif | |
159 | ||
160 | void | |
161 | #if __STDC__ | |
162 | err(const char *fmt, ...) | |
163 | #else | |
164 | err(fmt, va_alist) | |
165 | char *fmt; | |
166 | va_dcl | |
167 | #endif | |
168 | { | |
169 | va_list ap; | |
170 | #if __STDC__ | |
171 | va_start(ap, fmt); | |
172 | #else | |
173 | va_start(ap); | |
174 | #endif | |
175 | (void)fprintf(stderr, "dmesg: "); | |
176 | (void)vfprintf(stderr, fmt, ap); | |
177 | va_end(ap); | |
178 | (void)fprintf(stderr, "\n"); | |
179 | exit(1); | |
180 | /* NOTREACHED */ | |
181 | } | |
182 | ||
183 | void | |
184 | usage() | |
185 | { | |
186 | (void)fprintf(stderr, "usage: dmesg [-M core] [-N system]\n"); | |
187 | exit(1); | |
188 | } |