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) 1999,2000,2001 by Lineo, inc.
10 * Written by Erik Andersen <andersen@lineo.com>, <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 ! defined __GLIBC__ && ! defined __UCLIBC__
44 #include <sys/syscall.h>
45 #include <linux/unistd.h>
48 # define __NR_klogctl __NR_syslog
49 static inline _syscall3(int, klogctl, int, type, char *, b, int, len);
51 #define klogctl syslog
55 # include <sys/klog.h>
59 static void klogd_signal(int sig)
63 //logMessage(0, "Kernel log daemon exiting.");
64 syslog_msg(LOG_DAEMON, 0, "Kernel log daemon exiting.");
68 static void doKlogd (void) __attribute__ ((noreturn));
69 static void doKlogd (void)
71 int priority = LOG_INFO;
72 char log_buffer[4096];
76 /* Set up sig handlers */
77 signal(SIGINT, klogd_signal);
78 signal(SIGKILL, klogd_signal);
79 signal(SIGTERM, klogd_signal);
80 signal(SIGHUP, SIG_IGN);
82 /* "Open the log. Currently a NOP." */
85 syslog_msg(LOG_DAEMON, 0, "klogd started: BusyBox v" BB_VER " (" BB_BT ")");
88 /* Use kernel syscalls */
89 memset(log_buffer, '\0', sizeof(log_buffer));
90 n = klogctl(2, log_buffer, sizeof(log_buffer));
96 snprintf(message, 79, "klogd: Error return from sys_sycall: %d - %s.\n",
97 errno, strerror(errno));
98 syslog_msg(LOG_DAEMON, LOG_SYSLOG | LOG_ERR, message);
102 /* klogctl buffer parsing modelled after code in dmesg.c */
103 start=&log_buffer[0];
105 for (i=0; i<n; i++) {
106 if (lastc == '\0' && log_buffer[i] == '<') {
109 while (isdigit(log_buffer[i])) {
110 priority = priority*10+(log_buffer[i]-'0');
113 if (log_buffer[i] == '>') 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_DAEMON, LOG_KERN | priority, start);
119 start = &log_buffer[i+1];
122 lastc = log_buffer[i];
127 static void daemon_init (char **argv, char *dz, void fn (void))
129 setsid(); /* start a new session? */
130 strncpy(argv[0], dz, strlen(argv[0]));
135 extern int klogd_main(int argc, char **argv)
137 /* no options, no getopt */
141 /* do normal option parsing */
142 while ((opt = getopt(argc, argv, "n")) > 0) {
152 if (doFork == TRUE) {
157 daemon_init (argv, "klogd", doKlogd);
168 c-file-style: "linux"