160 lines
3.9 KiB
C
160 lines
3.9 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini klogd implementation for busybox
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*
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* Copyright (C) 2001 by Gennady Feldman <gfeldman@cachier.com>.
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* Changes: Made this a standalone busybox module which uses standalone
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* syslog() client interface.
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*
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* Copyright (C) 1999,2000,2001 by Lineo, inc.
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* Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
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*
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* Copyright (C) 2000 by Karl M. Hegbloom <karlheg@debian.org>
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*
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* "circular buffer" Copyright (C) 2000 by Gennady Feldman <gfeldman@mail.com>
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*
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* Maintainer: Gennady Feldman <gena01@cachier.com> as of Mar 12, 2001
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <signal.h> /* for our signal() handlers */
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#include <string.h> /* strncpy() */
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#include <errno.h> /* errno and friends */
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#include <unistd.h>
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#include <ctype.h>
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#include <sys/syslog.h>
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#if ! defined __GLIBC__ && ! defined __UCLIBC__
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#include <sys/syscall.h>
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#include <linux/unistd.h>
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#ifndef __alpha__
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# define __NR_klogctl __NR_syslog
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static inline _syscall3(int, klogctl, int, type, char *, b, int, len);
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#else /* __alpha__ */
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#define klogctl syslog
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#endif
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#else
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# include <sys/klog.h>
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#endif
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#include "busybox.h"
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static void klogd_signal(int sig)
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{
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klogctl(7, NULL, 0);
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klogctl(0, 0, 0);
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//logMessage(0, "Kernel log daemon exiting.");
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syslog_msg(LOG_DAEMON, 0, "Kernel log daemon exiting.");
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exit(TRUE);
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}
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static void doKlogd (void) __attribute__ ((noreturn));
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static void doKlogd (void)
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{
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int priority = LOG_INFO;
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char log_buffer[4096];
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int i, n, lastc;
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char *start;
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/* Set up sig handlers */
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signal(SIGINT, klogd_signal);
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signal(SIGKILL, klogd_signal);
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signal(SIGTERM, klogd_signal);
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signal(SIGHUP, SIG_IGN);
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/* "Open the log. Currently a NOP." */
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klogctl(1, NULL, 0);
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syslog_msg(LOG_DAEMON, 0, "klogd started: BusyBox v" BB_VER " (" BB_BT ")");
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while (1) {
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/* Use kernel syscalls */
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memset(log_buffer, '\0', sizeof(log_buffer));
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n = klogctl(2, log_buffer, sizeof(log_buffer));
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if (n < 0) {
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char message[80];
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if (errno == EINTR)
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continue;
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snprintf(message, 79, "klogd: Error return from sys_sycall: %d - %s.\n",
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errno, strerror(errno));
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syslog_msg(LOG_DAEMON, LOG_SYSLOG | LOG_ERR, message);
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exit(1);
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}
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/* klogctl buffer parsing modelled after code in dmesg.c */
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start=&log_buffer[0];
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lastc='\0';
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for (i=0; i<n; i++) {
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if (lastc == '\0' && log_buffer[i] == '<') {
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priority = 0;
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i++;
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while (isdigit(log_buffer[i])) {
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priority = priority*10+(log_buffer[i]-'0');
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i++;
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}
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if (log_buffer[i] == '>') i++;
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start = &log_buffer[i];
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}
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if (log_buffer[i] == '\n') {
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log_buffer[i] = '\0'; /* zero terminate this message */
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syslog_msg(LOG_DAEMON, LOG_KERN | priority, start);
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start = &log_buffer[i+1];
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priority = LOG_INFO;
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}
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lastc = log_buffer[i];
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}
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}
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}
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extern int klogd_main(int argc, char **argv)
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{
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/* no options, no getopt */
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int opt;
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int doFork = TRUE;
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/* do normal option parsing */
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while ((opt = getopt(argc, argv, "n")) > 0) {
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switch (opt) {
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case 'n':
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doFork = FALSE;
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break;
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default:
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show_usage();
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}
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}
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if (doFork == TRUE) {
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if (daemon(0, 1) < 0)
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perror_msg_and_die("daemon");
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}
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doKlogd();
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return EXIT_SUCCESS;
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}
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/*
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Local Variables
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c-file-style: "linux"
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c-basic-offset: 4
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tab-width: 4
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End:
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*/
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