1 files changed, 79 insertions, 0 deletions
diff --git a/usr/utils/dmesg.c b/usr/utils/dmesg.c
new file mode 100644
index 0000000..1960713
--- /dev/null
+++ b/usr/utils/dmesg.c
@@ -0,0 +1,79 @@
+#include <unistd.h>
+#include <stdio.h>
+#include <ctype.h>
+#include <stdlib.h>
+#include <sys/klog.h>
+
+static void usage(char *name)
+{
+	fprintf(stderr, "usage: %s [-c]\n", name);
+}
+
+int main(int argc, char *argv[])
+{
+	char *buf = NULL;
+	const char *p;
+	int c;
+	int bufsz = 0;
+	int cmd = 3;	/* Read all messages remaining in the ring buffer */
+	int len = 0;
+	int opt;
+	int newline;
+
+	while ((opt = getopt(argc, argv, "c")) != -1) {
+		switch (opt) {
+		/* Read and clear all messages remaining in the ring buffer */
+		case 'c':
+			cmd = 4;
+			break;
+		case '?':
+		default:
+			usage(argv[0]);
+			exit(1);
+		}
+	}
+
+	if (!bufsz) {
+		len = klogctl(10, NULL, 0); /* Get size of log buffer */
+		if (len > 0)
+			bufsz = len;
+	}
+
+	if (bufsz) {
+		int sz = bufsz + 8;
+
+		buf = (char *)malloc(sz);
+		len = klogctl(cmd, buf, sz);
+	}
+
+	if (len < 0) {
+		perror("klogctl");
+		exit(1);
+	}
+
+	newline = 1;
+	p = buf;
+	while ((c = *p)) {
+		switch (c) {
+		case '\n':
+			newline = 1;
+			putchar(c);
+			p++;
+			break;
+		case '<':
+			if (newline && isdigit(p[1]) && p[2] == '>') {
+				p += 3;
+				break;
+			}
+			/* else fall through */
+		default:
+			newline = 0;
+			putchar(c);
+			p++;
+		}
+	}
+	if (!newline)
+		putchar('\n');
+
+	return 0;
+}