1 files changed, 135 insertions, 0 deletions
diff --git a/sysklogd/klogd.c b/sysklogd/klogd.c
new file mode 100644
index 0000000..a27ddf4
--- /dev/null
+++ b/sysklogd/klogd.c
@@ -0,0 +1,135 @@
+/* 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
+ *
+ * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
+ */
+
+#include "libbb.h"
+#include <syslog.h>
+#include <sys/klog.h>
+
+static void klogd_signal(int sig)
+{
+	/* FYI: cmd 7 is equivalent to setting console_loglevel to 7
+	 * via klogctl(8, NULL, 7). */
+	klogctl(7, NULL, 0); /* "7 -- Enable printk's to console" */
+	klogctl(0, NULL, 0); /* "0 -- Close the log. Currently a NOP" */
+	syslog(LOG_NOTICE, "klogd: exiting");
+	kill_myself_with_sig(sig);
+}
+
+#define log_buffer bb_common_bufsiz1
+enum {
+	KLOGD_LOGBUF_SIZE = sizeof(log_buffer),
+	OPT_LEVEL      = (1 << 0),
+	OPT_FOREGROUND = (1 << 1),
+};
+
+int klogd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int klogd_main(int argc UNUSED_PARAM, char **argv)
+{
+	int i = 0;
+	char *start;
+	int opt;
+	int used = 0;
+
+	opt = getopt32(argv, "c:n", &start);
+	if (opt & OPT_LEVEL) {
+		/* Valid levels are between 1 and 8 */
+		i = xatou_range(start, 1, 8);
+	}
+	if (!(opt & OPT_FOREGROUND)) {
+		bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
+	}
+
+	openlog("kernel", 0, LOG_KERN);
+
+	bb_signals(0
+		+ (1 << SIGINT)
+		+ (1 << SIGTERM)
+		, klogd_signal);
+	signal(SIGHUP, SIG_IGN);
+
+	/* "Open the log. Currently a NOP" */
+	klogctl(1, NULL, 0);
+
+	/* "printk() prints a message on the console only if it has a loglevel
+	 * less than console_loglevel". Here we set console_loglevel = i. */
+	if (i)
+		klogctl(8, NULL, i);
+
+	syslog(LOG_NOTICE, "klogd started: %s", bb_banner);
+
+	while (1) {
+		int n;
+		int priority;
+
+		/* "2 -- Read from the log." */
+		n = klogctl(2, log_buffer + used, KLOGD_LOGBUF_SIZE-1 - used);
+		if (n < 0) {
+			if (errno == EINTR)
+				continue;
+			syslog(LOG_ERR, "klogd: error %d in klogctl(2): %m",
+					errno);
+			break;
+		}
+		log_buffer[used + n] = '\0';
+
+		/* klogctl buffer parsing modelled after code in dmesg.c */
+		start = &log_buffer[0];
+
+		/* Process each newline-terminated line in the buffer */
+		while (1) {
+			char *newline = strchr(start, '\n');
+
+			if (!newline) {
+				/* This line is incomplete... */
+				if (start != log_buffer) {
+					/* move it to the front of the buffer */
+					overlapping_strcpy(log_buffer, start);
+					/* don't log it yet */
+					used = strlen(log_buffer);
+					break;
+				}
+				/* ...but buffer is full, so log it anyway */
+				used = 0;
+			} else {
+				*newline++ = '\0';
+			}
+
+			/* Extract the priority */
+			priority = LOG_INFO;
+			if (*start == '<') {
+				start++;
+				if (*start) {
+					/* kernel never generates multi-digit prios */
+					priority = (*start - '0');
+					start++;
+				}
+				if (*start == '>') {
+					start++;
+				}
+			}
+			if (*start)
+				syslog(priority, "%s", start);
+			if (!newline)
+				break;
+			start = newline;
+		}
+	}
+
+	return EXIT_FAILURE;
+}