diff options
Diffstat (limited to 'dmesg.c')
-rw-r--r-- | dmesg.c | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/dmesg.c b/dmesg.c new file mode 100644 index 000000000..a63fa3d39 --- /dev/null +++ b/dmesg.c | |||
@@ -0,0 +1,95 @@ | |||
1 | #include "internal.h" | ||
2 | #include <stdlib.h> | ||
3 | #include <unistd.h> | ||
4 | #include <time.h> | ||
5 | |||
6 | /* dmesg.c -- Print out the contents of the kernel ring buffer | ||
7 | * Created: Sat Oct 9 16:19:47 1993 | ||
8 | * Revised: Thu Oct 28 21:52:17 1993 by faith@cs.unc.edu | ||
9 | * Copyright 1993 Theodore Ts'o (tytso@athena.mit.edu) | ||
10 | * This program comes with ABSOLUTELY NO WARRANTY. | ||
11 | * Modifications by Rick Sladkey (jrs@world.std.com) | ||
12 | * from util-linux; adapted for busybox | ||
13 | */ | ||
14 | |||
15 | #include <linux/unistd.h> | ||
16 | #include <stdio.h> | ||
17 | #include <getopt.h> | ||
18 | |||
19 | #define __NR_klog __NR_syslog | ||
20 | |||
21 | #if defined(__GLIBC__) | ||
22 | #include <sys/klog.h> | ||
23 | #define klog klogctl | ||
24 | #else | ||
25 | static inline _syscall3(int,klog,int,type,char *,b,int,len) | ||
26 | #endif /* __GLIBC__ */ | ||
27 | |||
28 | const char dmesg_usage[] = "dmesg"; | ||
29 | |||
30 | int | ||
31 | dmesg_main(struct FileInfo * info, int argc, char * * argv) | ||
32 | { | ||
33 | |||
34 | char buf[4096]; | ||
35 | int i; | ||
36 | int n; | ||
37 | int c; | ||
38 | int level = 0; | ||
39 | int lastc; | ||
40 | int cmd = 3; | ||
41 | |||
42 | while ((c = getopt( argc, argv, "cn:" )) != EOF) { | ||
43 | switch (c) { | ||
44 | case 'c': | ||
45 | cmd = 4; | ||
46 | break; | ||
47 | case 'n': | ||
48 | cmd = 8; | ||
49 | level = atoi(optarg); | ||
50 | break; | ||
51 | case '?': | ||
52 | default: | ||
53 | usage(dmesg_usage); | ||
54 | exit(1); | ||
55 | } | ||
56 | } | ||
57 | argc -= optind; | ||
58 | argv += optind; | ||
59 | |||
60 | if (argc > 1) { | ||
61 | usage(dmesg_usage); | ||
62 | exit(1); | ||
63 | } | ||
64 | |||
65 | if (cmd == 8) { | ||
66 | n = klog( cmd, NULL, level ); | ||
67 | if (n < 0) { | ||
68 | perror( "klog" ); | ||
69 | exit( 1 ); | ||
70 | } | ||
71 | exit( 0 ); | ||
72 | } | ||
73 | |||
74 | n = klog( cmd, buf, sizeof( buf ) ); | ||
75 | if (n < 0) { | ||
76 | perror( "klog" ); | ||
77 | exit( 1 ); | ||
78 | } | ||
79 | |||
80 | lastc = '\n'; | ||
81 | for (i = 0; i < n; i++) { | ||
82 | if ((i == 0 || buf[i - 1] == '\n') && buf[i] == '<') { | ||
83 | i++; | ||
84 | while (buf[i] >= '0' && buf[i] <= '9') | ||
85 | i++; | ||
86 | if (buf[i] == '>') | ||
87 | i++; | ||
88 | } | ||
89 | lastc = buf[i]; | ||
90 | putchar( lastc ); | ||
91 | } | ||
92 | if (lastc != '\n') | ||
93 | putchar( '\n' ); | ||
94 | return 0; | ||
95 | } | ||