| /* vi: set sw=4 ts=4: */ |
| /* |
| * Mini klogd implementation for busybox |
| * |
| * Copyright (C) 2001 by Gennady Feldman <gfeldman@gena01.com>. |
| * Changes: Made this a standalone busybox module which uses standalone |
| * syslog() client interface. |
| * |
| * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> |
| * |
| * Copyright (C) 2000 by Karl M. Hegbloom <karlheg@debian.org> |
| * |
| * "circular buffer" Copyright (C) 2000 by Gennady Feldman <gfeldman@gena01.com> |
| * |
| * Maintainer: Gennady Feldman <gfeldman@gena01.com> as of Mar 12, 2001 |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <signal.h> /* for our signal() handlers */ |
| #include <string.h> /* strncpy() */ |
| #include <errno.h> /* errno and friends */ |
| #include <unistd.h> |
| #include <ctype.h> |
| #include <sys/syslog.h> |
| #include <sys/klog.h> |
| |
| #include "busybox.h" |
| |
| static void klogd_signal(int sig) |
| { |
| klogctl(7, NULL, 0); |
| klogctl(0, 0, 0); |
| /* logMessage(0, "Kernel log daemon exiting."); */ |
| syslog(LOG_NOTICE, "Kernel log daemon exiting."); |
| exit(EXIT_SUCCESS); |
| } |
| |
| static void doKlogd(const int console_log_level) __attribute__ ((noreturn)); |
| static void doKlogd(const int console_log_level) |
| { |
| int priority = LOG_INFO; |
| char log_buffer[4096]; |
| int i, n, lastc; |
| char *start; |
| |
| openlog("kernel", 0, LOG_KERN); |
| |
| /* Set up sig handlers */ |
| signal(SIGINT, klogd_signal); |
| signal(SIGKILL, klogd_signal); |
| signal(SIGTERM, klogd_signal); |
| signal(SIGHUP, SIG_IGN); |
| |
| /* "Open the log. Currently a NOP." */ |
| klogctl(1, NULL, 0); |
| |
| /* Set level of kernel console messaging.. */ |
| if (console_log_level != -1) |
| klogctl(8, NULL, console_log_level); |
| |
| syslog(LOG_NOTICE, "klogd started: " BB_BANNER); |
| |
| while (1) { |
| /* Use kernel syscalls */ |
| memset(log_buffer, '\0', sizeof(log_buffer)); |
| n = klogctl(2, log_buffer, sizeof(log_buffer)); |
| if (n < 0) { |
| if (errno == EINTR) |
| continue; |
| syslog(LOG_ERR, "klogd: Error return from sys_sycall: %d - %m.\n", errno); |
| exit(EXIT_FAILURE); |
| } |
| |
| /* klogctl buffer parsing modelled after code in dmesg.c */ |
| start = &log_buffer[0]; |
| lastc = '\0'; |
| for (i = 0; i < n; i++) { |
| if (lastc == '\0' && log_buffer[i] == '<') { |
| priority = 0; |
| i++; |
| while (isdigit(log_buffer[i])) { |
| priority = priority * 10 + (log_buffer[i] - '0'); |
| i++; |
| } |
| if (log_buffer[i] == '>') |
| i++; |
| start = &log_buffer[i]; |
| } |
| if (log_buffer[i] == '\n') { |
| log_buffer[i] = '\0'; /* zero terminate this message */ |
| syslog(priority, start); |
| start = &log_buffer[i + 1]; |
| priority = LOG_INFO; |
| } |
| lastc = log_buffer[i]; |
| } |
| } |
| } |
| |
| extern int klogd_main(int argc, char **argv) |
| { |
| /* no options, no getopt */ |
| int opt; |
| int doFork = TRUE; |
| unsigned char console_log_level = -1; |
| |
| /* do normal option parsing */ |
| while ((opt = getopt(argc, argv, "c:n")) > 0) { |
| switch (opt) { |
| case 'c': |
| if ((optarg == NULL) || (optarg[1] != '\0')) { |
| bb_show_usage(); |
| } |
| /* Valid levels are between 1 and 8 */ |
| console_log_level = *optarg - '1'; |
| if (console_log_level > 7) { |
| bb_show_usage(); |
| } |
| console_log_level++; |
| |
| break; |
| case 'n': |
| doFork = FALSE; |
| break; |
| default: |
| bb_show_usage(); |
| } |
| } |
| |
| if (doFork) { |
| #if defined(__uClinux__) |
| vfork_daemon_rexec(0, 1, argc, argv, "-n"); |
| #else /* __uClinux__ */ |
| if (daemon(0, 1) < 0) |
| bb_perror_msg_and_die("daemon"); |
| #endif /* __uClinux__ */ |
| } |
| doKlogd(console_log_level); |
| |
| return EXIT_SUCCESS; |
| } |
| |
| /* |
| Local Variables |
| c-file-style: "linux" |
| c-basic-offset: 4 |
| tab-width: 4 |
| End: |
| */ |