source: MondoRescue/branches/2.2.9/mindi-busybox/sysklogd/klogd.c@ 2142

Last change on this file since 2142 was 1765, checked in by Bruno Cornec, 16 years ago

Update to busybox 1.7.2
File size: 2.8 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Mini klogd implementation for busybox
4 *
5 * Copyright (C) 2001 by Gennady Feldman <gfeldman@gena01.com>.
6 * Changes: Made this a standalone busybox module which uses standalone
7 * syslog() client interface.
8 *
9 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
10 *
11 * Copyright (C) 2000 by Karl M. Hegbloom <karlheg@debian.org>
12 *
13 * "circular buffer" Copyright (C) 2000 by Gennady Feldman <gfeldman@gena01.com>
14 *
15 * Maintainer: Gennady Feldman <gfeldman@gena01.com> as of Mar 12, 2001
16 *
17 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
18 */
19
20#include "libbb.h"
21#include <sys/syslog.h>
22#include <sys/klog.h>
23
24static void klogd_signal(int sig ATTRIBUTE_UNUSED)
25{
26 klogctl(7, NULL, 0);
27 klogctl(0, 0, 0);
28 syslog(LOG_NOTICE, "Kernel log daemon exiting");
29 exit(EXIT_SUCCESS);
30}
31
32#define OPT_LEVEL 1
33#define OPT_FOREGROUND 2
34
35#define KLOGD_LOGBUF_SIZE BUFSIZ
36#define log_buffer bb_common_bufsiz1
37
38int klogd_main(int argc, char **argv);
39int klogd_main(int argc, char **argv)
40{
41 int i = i; /* silence gcc */
42 char *start;
43
44 /* do normal option parsing */
45 getopt32(argv, "c:n", &start);
46
47 if (option_mask32 & OPT_LEVEL) {
48 /* Valid levels are between 1 and 8 */
49 i = xatoul_range(start, 1, 8);
50 }
51
52 if (!(option_mask32 & OPT_FOREGROUND)) {
53 bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
54 }
55
56 openlog("kernel", 0, LOG_KERN);
57
58 /* Set up sig handlers */
59 signal(SIGINT, klogd_signal);
60 signal(SIGKILL, klogd_signal);
61 signal(SIGTERM, klogd_signal);
62 signal(SIGHUP, SIG_IGN);
63
64 /* "Open the log. Currently a NOP." */
65 klogctl(1, NULL, 0);
66
67 /* Set level of kernel console messaging. */
68 if (option_mask32 & OPT_LEVEL)
69 klogctl(8, NULL, i);
70
71 syslog(LOG_NOTICE, "klogd started: %s", bb_banner);
72
73 /* Note: this code does not detect incomplete messages
74 * (messages not ending with '\n' or just when kernel
75 * generates too many messages for us to keep up)
76 * and will split them in two separate lines */
77 while (1) {
78 int n;
79 int priority;
80
81 n = klogctl(2, log_buffer, KLOGD_LOGBUF_SIZE - 1);
82 if (n < 0) {
83 if (errno == EINTR)
84 continue;
85 syslog(LOG_ERR, "klogd: error from klogctl(2): %d - %m",
86 errno);
87 break;
88 }
89 log_buffer[n] = '\n';
90 i = 0;
91 while (i < n) {
92 priority = LOG_INFO;
93 start = &log_buffer[i];
94 if (log_buffer[i] == '<') {
95 i++;
96 // kernel never ganerates multi-digit prios
97 //priority = 0;
98 //while (log_buffer[i] >= '0' && log_buffer[i] <= '9') {
99 // priority = priority * 10 + (log_buffer[i] - '0');
100 // i++;
101 //}
102 if (isdigit(log_buffer[i])) {
103 priority = (log_buffer[i] - '0');
104 i++;
105 }
106 if (log_buffer[i] == '>')
107 i++;
108 start = &log_buffer[i];
109 }
110 while (log_buffer[i] != '\n')
111 i++;
112 log_buffer[i] = '\0';
113 syslog(priority, "%s", start);
114 i++;
115 }
116 }
117
118 return EXIT_FAILURE;
119}
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