Make kdb_dbbe_select() available as an interface function. This allows

changing the backend from outside the KDB frontend. For example from
within a backend. Rewrite kdb_sysctl_current to make use of this
function as well.

2 files changed, 21 insertions, 9 deletions

diff --git a/sys/kern/subr_kdb.c b/sys/kern/subr_kdb.c
index 1c91deb..0fc015e 100644
--- a/sys/kern/subr_kdb.c
+++ b/sys/kern/subr_kdb.c
@@ -101,7 +101,6 @@ static int
 kdb_sysctl_current(SYSCTL_HANDLER_ARGS)
 {
 	char buf[16];
-	struct kdb_dbbe *be, **iter;
 	int error;
 
 	if (kdb_dbbe != NULL) {
@@ -114,14 +113,7 @@ kdb_sysctl_current(SYSCTL_HANDLER_ARGS)
 		return (error);
 	if (kdb_active)
 		return (EBUSY);
-	SET_FOREACH(iter, kdb_dbbe_set) {
-		be = *iter;
-		if (be->dbbe_active == 0 && strcmp(be->dbbe_name, buf) == 0) {
-			kdb_dbbe = be;
-			return (0);
-		}
-	}
-	return (EINVAL);
+	return (kdb_dbbe_select(buf));
 }
 
 static int
@@ -199,6 +191,25 @@ kdb_backtrace()
 }
 
 /*
+ * Set/change the current backend.
+ */
+
+int
+kdb_dbbe_select(const char *name)
+{
+	struct kdb_dbbe *be, **iter;
+
+	SET_FOREACH(iter, kdb_dbbe_set) {
+		be = *iter;
+		if (be->dbbe_active == 0 && strcmp(be->dbbe_name, name) == 0) {
+			kdb_dbbe = be;
+			return (0);
+		}
+	}
+	return (EINVAL);
+}
+
+/*
  * Enter the currently selected debugger. If a message has been provided,
  * it is printed first. If the debugger does not support the enter method,
  * it is entered by using breakpoint(), which enters the debugger through
diff --git a/sys/sys/kdb.h b/sys/sys/kdb.h
index f7c0988..6a1b8f7 100644
--- a/sys/sys/kdb.h
+++ b/sys/sys/kdb.h
@@ -64,6 +64,7 @@ extern struct thread *kdb_thread;	/* Current thread. */
 
 int	kdb_alt_break(int, int *);
 void	kdb_backtrace(void);
+int	kdb_dbbe_select(const char *);
 void	kdb_enter(const char *);
 void	kdb_init(void);
 void *	kdb_jmpbuf(jmp_buf);