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-rw-r--r--klogd.c171
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diff --git a/klogd.c b/klogd.c
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+/* vi: set sw=4 ts=4: */
+/*
+ * Mini klogd implementation for busybox
+ *
+ * Copyright (C) 2001 by Gennady Feldman <gfeldman@cachier.com>.
+ * Changes: Made this a standalone busybox module which uses standalone
+ * syslog() client interface.
+ *
+ * Copyright (C) 1999,2000,2001 by Lineo, inc.
+ * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
+ *
+ * Copyright (C) 2000 by Karl M. Hegbloom <karlheg@debian.org>
+ *
+ * "circular buffer" Copyright (C) 2000 by Gennady Feldman <gfeldman@mail.com>
+ *
+ * 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>
+
+#if ! defined __GLIBC__ && ! defined __UCLIBC__
+#include <sys/syscall.h>
+#include <linux/unistd.h>
+typedef unsigned int socklen_t;
+
+#ifndef __alpha__
+# define __NR_klogctl __NR_syslog
+static inline _syscall3(int, klogctl, int, type, char *, b, int, len);
+#else /* __alpha__ */
+#define klogctl syslog
+#endif
+
+#else
+# include <sys/klog.h>
+#endif
+#include "busybox.h"
+
+static void klogd_signal(int sig)
+{
+ klogctl(7, NULL, 0);
+ klogctl(0, 0, 0);
+ //logMessage(0, "Kernel log daemon exiting.");
+ syslog_msg(LOG_DAEMON, 0, "Kernel log daemon exiting.");
+ exit(TRUE);
+}
+
+static void doKlogd (void) __attribute__ ((noreturn));
+static void doKlogd (void)
+{
+ int priority = LOG_INFO;
+ char log_buffer[4096];
+ int i, n, lastc;
+ char *start;
+
+ /* 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);
+
+ syslog_msg(LOG_DAEMON, 0, "klogd started: BusyBox v" BB_VER " (" BB_BT ")");
+
+ while (1) {
+ /* Use kernel syscalls */
+ memset(log_buffer, '\0', sizeof(log_buffer));
+ n = klogctl(2, log_buffer, sizeof(log_buffer));
+ if (n < 0) {
+ char message[80];
+
+ if (errno == EINTR)
+ continue;
+ snprintf(message, 79, "klogd: Error return from sys_sycall: %d - %s.\n",
+ errno, strerror(errno));
+ syslog_msg(LOG_DAEMON, LOG_SYSLOG | LOG_ERR, message);
+ exit(1);
+ }
+
+ /* 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_msg(LOG_DAEMON, LOG_KERN | priority, start);
+ start = &log_buffer[i+1];
+ priority = LOG_INFO;
+ }
+ lastc = log_buffer[i];
+ }
+ }
+}
+
+static void daemon_init (char **argv, char *dz, void fn (void))
+{
+ setsid(); /* start a new session? */
+ strncpy(argv[0], dz, strlen(argv[0]));
+ fn();
+ exit(0);
+}
+
+extern int klogd_main(int argc, char **argv)
+{
+ /* no options, no getopt */
+ int opt, pid;
+ int doFork = TRUE;
+
+ /* do normal option parsing */
+ while ((opt = getopt(argc, argv, "n")) > 0) {
+ switch (opt) {
+ case 'n':
+ doFork = FALSE;
+ break;
+ default:
+ show_usage();
+ }
+ }
+
+ if (doFork == TRUE) {
+ pid = fork();
+ if (pid < 0)
+ exit(pid);
+ else if (pid == 0) {
+ daemon_init (argv, "klogd", doKlogd);
+ }
+ } else {
+ doKlogd();
+ }
+
+ return EXIT_SUCCESS;
+}
+
+/*
+Local Variables
+c-file-style: "linux"
+c-basic-offset: 4
+tab-width: 4
+End:
+*/