1 /* vi: set sw=4 ts=4: */
3 * Mini klogd implementation for busybox
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.
9 * Copyright (C) 1999-2003 by Erik Andersen <andersen@codepoet.org>
11 * Copyright (C) 2000 by Karl M. Hegbloom <karlheg@debian.org>
13 * "circular buffer" Copyright (C) 2000 by Gennady Feldman <gfeldman@gena01.com>
15 * Maintainer: Gennady Feldman <gfeldman@gena01.com> as of Mar 12, 2001
17 * This program is free software; you can redistribute it and/or modify
18 * it under the terms of the GNU General Public License as published by
19 * the Free Software Foundation; either version 2 of the License, or
20 * (at your option) any later version.
22 * This program is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25 * General Public License for more details.
27 * You should have received a copy of the GNU General Public License
28 * along with this program; if not, write to the Free Software
29 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
35 #include <signal.h> /* for our signal() handlers */
36 #include <string.h> /* strncpy() */
37 #include <errno.h> /* errno and friends */
40 #include <sys/syslog.h>
45 static void klogd_signal(int sig)
49 /* logMessage(0, "Kernel log daemon exiting."); */
50 syslog_msg(LOG_SYSLOG, LOG_NOTICE, "Kernel log daemon exiting.");
54 static void doKlogd(const char console_log_level) __attribute__ ((noreturn));
55 static void doKlogd(const char console_log_level)
57 int priority = LOG_INFO;
58 char log_buffer[4096];
62 /* Set up sig handlers */
63 signal(SIGINT, klogd_signal);
64 signal(SIGKILL, klogd_signal);
65 signal(SIGTERM, klogd_signal);
66 signal(SIGHUP, SIG_IGN);
68 /* "Open the log. Currently a NOP." */
71 /* Set level of kernel console messaging.. */
72 if (console_log_level)
73 klogctl(8, NULL, console_log_level);
75 syslog_msg(LOG_SYSLOG, LOG_NOTICE, "klogd started: " BB_BANNER);
78 /* Use kernel syscalls */
79 memset(log_buffer, '\0', sizeof(log_buffer));
80 n = klogctl(2, log_buffer, sizeof(log_buffer));
87 "klogd: Error return from sys_sycall: %d - %s.\n", errno,
89 syslog_msg(LOG_SYSLOG, LOG_ERR, message);
93 /* klogctl buffer parsing modelled after code in dmesg.c */
94 start = &log_buffer[0];
96 for (i = 0; i < n; i++) {
97 if (lastc == '\0' && log_buffer[i] == '<') {
100 while (isdigit(log_buffer[i])) {
101 priority = priority * 10 + (log_buffer[i] - '0');
104 if (log_buffer[i] == '>')
106 start = &log_buffer[i];
108 if (log_buffer[i] == '\n') {
109 log_buffer[i] = '\0'; /* zero terminate this message */
110 syslog_msg(LOG_KERN, priority, start);
111 start = &log_buffer[i + 1];
114 lastc = log_buffer[i];
119 extern int klogd_main(int argc, char **argv)
121 /* no options, no getopt */
124 unsigned char console_log_level = 7;
126 /* do normal option parsing */
127 while ((opt = getopt(argc, argv, "c:n")) > 0) {
130 if ((optarg == NULL) || (optarg[1] != '\0')) {
133 /* Valid levels are between 1 and 8 */
134 console_log_level = *optarg - '1';
135 if (console_log_level > 7) {
150 if (daemon(0, 1) < 0)
151 bb_perror_msg_and_die("daemon");
152 #if defined(__uClinux__)
153 vfork_daemon_rexec(argc, argv, "-n");
156 doKlogd(console_log_level);
163 c-file-style: "linux"