From 6317c4baf79c25d7f77897b064eb4f0b7d9f070e Mon Sep 17 00:00:00 2001
From: Mark Whitley <markw@lineo.com>
Date: Mon, 12 Mar 2001 22:51:50 +0000
Subject: Applied patch from Gennady Feldman to split up syslogd.c into syslogd
 and klogd (as it should be).

---
 klogd.c | 171 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 171 insertions(+)
 create mode 100644 klogd.c

(limited to 'klogd.c')

diff --git a/klogd.c b/klogd.c
new file mode 100644
index 000000000..f44383637
--- /dev/null
+++ b/klogd.c
@@ -0,0 +1,171 @@
+/* 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:
+*/
-- 
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