1 files changed, 53 insertions, 0 deletions
diff --git a/util-linux/dmesg.c b/util-linux/dmesg.c
new file mode 100644
index 000000000..658cddc38
--- /dev/null
+++ b/util-linux/dmesg.c
@@ -0,0 +1,53 @@
+/* vi: set sw=4 ts=4: */
+/*
+ *
+ * dmesg - display/control kernel ring buffer.
+ *
+ * Copyright 2006 Rob Landley <rob@landley.net>
+ * Copyright 2006 Bernhard Fischer <rep.nop@aon.at>
+ *
+ * Licensed under GPLv2, see file LICENSE in this tarball for details.
+ */
+
+#include "busybox.h"
+#include <unistd.h>
+#include <sys/klog.h>
+
+int dmesg_main(int argc, char *argv[])
+{
+	char *size, *level;
+	int flags = getopt32(argc, argv, "cs:n:", &size, &level);
+
+	if (flags & 4) {
+		if (klogctl(8, NULL, xatoul_range(level, 0, 10)))
+			bb_perror_msg_and_die("klogctl");
+	} else {
+		int len;
+		char *buf;
+
+		len = (flags & 2) ? xatoul_range(size, 2, INT_MAX) : 16384;
+		buf = xmalloc(len);
+		if (0 > (len = klogctl(3 + (flags & 1), buf, len)))
+			bb_perror_msg_and_die("klogctl");
+
+		// Skip <#> at the start of lines, and make sure we end with a newline.
+
+		if (ENABLE_FEATURE_DMESG_PRETTY) {
+			int last = '\n';
+			int in;
+
+			for (in = 0; in<len;) {
+				if (last == '\n' && buf[in] == '<') in += 3;
+				else putchar(last = buf[in++]);
+			}
+			if (last != '\n') putchar('\n');
+		} else {
+			write(1,buf,len);
+			if (len && buf[len-1]!='\n') putchar('\n');
+		}
+
+		if (ENABLE_FEATURE_CLEAN_UP) free(buf);
+	}
+
+	return 0;
+}