From 22767031082dd3f46ff87d00ebcf9bafd1fa4ddb Mon Sep 17 00:00:00 2001
From: Edward Tomasz Napierala <trasz@FreeBSD.org>
Date: Thu, 30 Nov 2017 12:22:15 +0000
Subject: [PATCH] Make the ddb(4) "set" command list variables when called
 without parameters.

Obtained from:	CheriBSD
MFC after:	2 weeks
Sponsored by:	DARPA, AFRL
---
 sys/ddb/db_variables.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/sys/ddb/db_variables.c b/sys/ddb/db_variables.c
index b20b93a34fb..d69c9804ff5 100644
--- a/sys/ddb/db_variables.c
+++ b/sys/ddb/db_variables.c
@@ -134,6 +134,17 @@ db_set_cmd(db_expr_t dummy1, bool dummy2, db_expr_t dummy3, char *dummy4)
 	int t;
 
 	t = db_read_token();
+	if (t == tEOL) {
+		for (vp = db_vars; vp < db_evars; vp++) {
+			if (!db_read_variable(vp, &value)) {
+				db_printf("$%s\n", vp->name);
+				continue;
+			}
+			db_printf("$%-8s = %ld\n",
+			    vp->name, (unsigned long)value);
+		}
+		return;
+	}
 	if (t != tDOLLAR) {
 		db_error("Unknown variable\n");
 		return;
-- 
2.45.0