1 files changed, 67 insertions, 0 deletions
diff --git a/util-linux/dmesg.c b/util-linux/dmesg.c
new file mode 100644
index 0000000..f52026c
--- /dev/null
+++ b/util-linux/dmesg.c
@@ -0,0 +1,67 @@
+/* vi: set sw=4 ts=4: */
+/*
+ *
+ * dmesg - display/control kernel ring buffer.
+ *
+ * Copyright 2006 Rob Landley <rob@landley.net>
+ * Copyright 2006 Bernhard Reutner-Fischer <rep.nop@aon.at>
+ *
+ * Licensed under GPLv2, see file LICENSE in this tarball for details.
+ */
+
+#include <sys/klog.h>
+#include "libbb.h"
+
+int dmesg_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int dmesg_main(int argc UNUSED_PARAM, char **argv)
+{
+	int len;
+	char *buf;
+	char *size, *level;
+	unsigned flags = getopt32(argv, "cs:n:", &size, &level);
+	enum {
+		OPT_c = 1<<0,
+		OPT_s = 1<<1,
+		OPT_n = 1<<2
+	};
+
+	if (flags & OPT_n) {
+		if (klogctl(8, NULL, xatoul_range(level, 0, 10)))
+			bb_perror_msg_and_die("klogctl");
+		return EXIT_SUCCESS;
+	}
+
+	len = (flags & OPT_s) ? xatoul_range(size, 2, INT_MAX) : 16384;
+	buf = xmalloc(len);
+	len = klogctl(3 + (flags & OPT_c), buf, len);
+	if (len < 0)
+		bb_perror_msg_and_die("klogctl");
+	if (len == 0)
+		return EXIT_SUCCESS;
+
+	/* Skip <#> at the start of lines, and make sure we end with a newline. */
+
+	if (ENABLE_FEATURE_DMESG_PRETTY) {
+		int last = '\n';
+		int in = 0;
+
+		do {
+			if (last == '\n' && buf[in] == '<')
+				in += 3;
+			else {
+				last = buf[in++];
+				bb_putchar(last);
+			}
+		} while (in < len);
+		if (last != '\n')
+			bb_putchar('\n');
+	} else {
+		full_write(STDOUT_FILENO, buf, len);
+		if (buf[len-1] != '\n')
+			bb_putchar('\n');
+	}
+
+	if (ENABLE_FEATURE_CLEAN_UP) free(buf);
+
+	return EXIT_SUCCESS;
+}