1 /* vi: set sw=4 ts=4: */
3 * Mini klogd implementation for busybox
5 * Copyright (C) 2001 by Gennady Feldman <gfeldman@cachier.com>.
6 * Changes: Made this a standalone busybox module which uses standalone
7 * syslog() client interface.
9 * Copyright (C) 1999,2000 by Lineo, inc. and Erik Andersen
10 * Copyright (C) 1999,2000,2001 by Erik Andersen <andersee@debian.org>
12 * Copyright (C) 2000 by Karl M. Hegbloom <karlheg@debian.org>
14 * "circular buffer" Copyright (C) 2000 by Gennady Feldman <gfeldman@mail.com>
16 * Maintainer: Gennady Feldman <gena01@cachier.com> as of Mar 12, 2001
18 * This program is free software; you can redistribute it and/or modify
19 * it under the terms of the GNU General Public License as published by
20 * the Free Software Foundation; either version 2 of the License, or
21 * (at your option) any later version.
23 * This program is distributed in the hope that it will be useful,
24 * but WITHOUT ANY WARRANTY; without even the implied warranty of
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
26 * General Public License for more details.
28 * You should have received a copy of the GNU General Public License
29 * along with this program; if not, write to the Free Software
30 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
36 #include <signal.h> /* for our signal() handlers */
37 #include <string.h> /* strncpy() */
38 #include <errno.h> /* errno and friends */
41 #include <sys/syslog.h>
43 #if __GNU_LIBRARY__ < 5
45 # define klogctl syslog
48 # include <sys/klog.h>
53 static void klogd_signal(int sig)
57 /* logMessage(0, "Kernel log daemon exiting."); */
58 syslog_msg(LOG_SYSLOG, LOG_NOTICE, "Kernel log daemon exiting.");
62 static void doKlogd(const char console_log_level) __attribute__ ((noreturn));
63 static void doKlogd(const char console_log_level)
65 int priority = LOG_INFO;
66 char log_buffer[4096];
70 /* Set up sig handlers */
71 signal(SIGINT, klogd_signal);
72 signal(SIGKILL, klogd_signal);
73 signal(SIGTERM, klogd_signal);
74 signal(SIGHUP, SIG_IGN);
76 /* "Open the log. Currently a NOP." */
79 /* Set level of kernel console messaging.. */
80 if (console_log_level)
81 klogctl(8, NULL, console_log_level);
83 syslog_msg(LOG_SYSLOG, LOG_NOTICE, "klogd started: " BB_BANNER);
86 /* Use kernel syscalls */
87 memset(log_buffer, '\0', sizeof(log_buffer));
88 n = klogctl(2, log_buffer, sizeof(log_buffer));
95 "klogd: Error return from sys_sycall: %d - %s.\n", errno,
97 syslog_msg(LOG_SYSLOG, LOG_ERR, message);
101 /* klogctl buffer parsing modelled after code in dmesg.c */
102 start = &log_buffer[0];
104 for (i = 0; i < n; i++) {
105 if (lastc == '\0' && log_buffer[i] == '<') {
108 while (isdigit(log_buffer[i])) {
109 priority = priority * 10 + (log_buffer[i] - '0');
112 if (log_buffer[i] == '>')
114 start = &log_buffer[i];
116 if (log_buffer[i] == '\n') {
117 log_buffer[i] = '\0'; /* zero terminate this message */
118 syslog_msg(LOG_KERN, priority, start);
119 start = &log_buffer[i + 1];
122 lastc = log_buffer[i];
127 extern int klogd_main(int argc, char **argv)
129 /* no options, no getopt */
132 unsigned char console_log_level = 7;
134 /* do normal option parsing */
135 while ((opt = getopt(argc, argv, "c:n")) > 0) {
138 if ((optarg == NULL) || (optarg[1] != '\0')) {
141 /* Valid levels are between 1 and 8 */
142 console_log_level = *optarg - '1';
143 if (console_log_level > 7) {
158 #if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
159 if (daemon(0, 1) < 0)
160 perror_msg_and_die("daemon");
162 error_msg_and_die("daemon not supported");
165 doKlogd(console_log_level);
172 c-file-style: "linux"