Commit | Line | Data |
---|---|---|
34a7981f BJ |
1 | static char *sccsid = "@(#)dmesg.c 4.1 (Berkeley) 82/03/01"; |
2 | /* | |
3 | * Suck up system messages | |
4 | * dmesg | |
5 | * print current buffer | |
6 | * dmesg - | |
7 | * print and update incremental history | |
8 | */ | |
9 | ||
10 | #include <stdio.h> | |
11 | #include <sys/param.h> | |
12 | #include <nlist.h> | |
13 | #include <signal.h> | |
14 | #include <sys/vm.h> | |
15 | #include <sys/msgbuf.h> | |
16 | ||
17 | struct msgbuf msgbuf; | |
18 | char *msgbufp; | |
19 | int sflg; | |
20 | int of = -1; | |
21 | ||
22 | struct msgbuf omesg; | |
23 | struct nlist nl[2] = { | |
24 | { "_msgbuf" }, | |
25 | { 0 } | |
26 | }; | |
27 | ||
28 | main(argc, argv) | |
29 | char **argv; | |
30 | { | |
31 | int mem; | |
32 | register char *mp, *omp, *mstart; | |
33 | int timeout(); | |
34 | int samef; | |
35 | ||
36 | signal(SIGALRM, timeout); | |
37 | alarm(30); | |
38 | if (argc>1 && argv[1][0] == '-') { | |
39 | sflg++; | |
40 | argc--; | |
41 | argv++; | |
42 | } | |
43 | if (sflg) { | |
44 | of = open("/usr/adm/msgbuf", 2); | |
45 | read(of, (char *)&omesg, sizeof(omesg)); | |
46 | lseek(of, 0L, 0); | |
47 | } | |
48 | sflg = 0; | |
49 | nlist(argc>2? argv[2]:"/vmunix", nl); | |
50 | if (nl[0].n_type==0) | |
51 | done("No namelist\n"); | |
52 | if ((mem = open((argc>1? argv[1]: "/dev/kmem"), 0)) < 0) | |
53 | done("No mem\n"); | |
54 | lseek(mem, (long)nl[0].n_value, 0); | |
55 | read(mem, &msgbuf, sizeof (msgbuf)); | |
56 | if (msgbuf.msg_magic != MSG_MAGIC) | |
57 | done("Magic number wrong (namelist mismatch?)\n"); | |
58 | mstart = &msgbuf.msg_bufc[omesg.msg_bufx]; | |
59 | omp = &omesg.msg_bufc[msgbuf.msg_bufx]; | |
60 | mp = msgbufp = &msgbuf.msg_bufc[msgbuf.msg_bufx]; | |
61 | samef = 1; | |
62 | do { | |
63 | if (*mp++ != *omp++) { | |
64 | mstart = msgbufp; | |
65 | samef = 0; | |
66 | pdate(); | |
67 | printf("...\n"); | |
68 | break; | |
69 | } | |
70 | if (mp == &msgbuf.msg_bufc[MSG_BSIZE]) | |
71 | mp = msgbuf.msg_bufc; | |
72 | if (omp == &omesg.msg_bufc[MSG_BSIZE]) | |
73 | omp = omesg.msg_bufc; | |
74 | } while (mp != mstart); | |
75 | if (samef && omesg.msg_bufx == msgbuf.msg_bufx) | |
76 | exit(0); | |
77 | mp = mstart; | |
78 | do { | |
79 | pdate(); | |
80 | if (*mp && (*mp & 0200) == 0) | |
81 | putchar(*mp); | |
82 | mp++; | |
83 | if (mp == &msgbuf.msg_bufc[MSG_BSIZE]) | |
84 | mp = msgbuf.msg_bufc; | |
85 | } while (mp != msgbufp); | |
86 | done((char *)NULL); | |
87 | } | |
88 | ||
89 | done(s) | |
90 | char *s; | |
91 | { | |
92 | register char *p, *q; | |
93 | ||
94 | if (s && s!=(char *)omesg.msg_magic && sflg==0) { | |
95 | pdate(); | |
96 | printf(s); | |
97 | } | |
98 | write(of, (char *)&msgbuf, sizeof(msgbuf)); | |
99 | exit(s!=NULL); | |
100 | } | |
101 | ||
102 | pdate() | |
103 | { | |
104 | extern char *ctime(); | |
105 | static firstime; | |
106 | time_t tbuf; | |
107 | ||
108 | if (firstime==0) { | |
109 | firstime++; | |
110 | time(&tbuf); | |
111 | printf("\n%.12s\n", ctime(&tbuf)+4); | |
112 | } | |
113 | } | |
114 | ||
115 | timeout() | |
116 | { | |
117 | done("Buffer file screwed up\n"); | |
118 | } |