enable dynamic addition of "show all" commands

MFC after:	3 weeks

3 files changed, 15 insertions, 2 deletions

diff --git a/sys/ddb/db_command.c b/sys/ddb/db_command.c
index db6dc24..0395e75 100644
--- a/sys/ddb/db_command.c
+++ b/sys/ddb/db_command.c
@@ -65,6 +65,7 @@ db_addr_t	db_next;
 
 SET_DECLARE(db_cmd_set, struct command);
 SET_DECLARE(db_show_cmd_set, struct command);
+SET_DECLARE(db_show_all_cmd_set, struct command);
 
 static db_cmdfcn_t	db_fncall;
 static db_cmdfcn_t	db_gdb;
@@ -80,12 +81,13 @@ static db_cmdfcn_t	db_watchdog;
  */
 
 static struct command db_show_all_cmds[] = {
-	{ "procs",	db_ps,			0,	0 },
 	{ (char *)0 }
 };
 
 static struct command_table db_show_all_table = {
-	db_show_all_cmds
+	db_show_all_cmds,
+	SET_BEGIN(db_show_all_cmd_set),
+	SET_LIMIT(db_show_all_cmd_set)
 };
 
 static struct command db_show_cmds[] = {
diff --git a/sys/ddb/db_ps.c b/sys/ddb/db_ps.c
index 5d5e068..bf14ecf 100644
--- a/sys/ddb/db_ps.c
+++ b/sys/ddb/db_ps.c
@@ -46,6 +46,15 @@ __FBSDID("$FreeBSD$");
 
 static void	dumpthread(volatile struct proc *p, volatile struct thread *td,
 		    int all);
+/*
+ * At least one non-optional show-command must be implemented using
+ * DB_SHOW_ALL_COMMAND() so that db_show_all_cmd_set gets created.
+ * Here is one.
+ */
+DB_SHOW_ALL_COMMAND(procs, db_procs_cmd)
+{
+	db_ps(addr, have_addr, count, modif);
+}
 
 /*
  * Layout:
diff --git a/sys/ddb/ddb.h b/sys/ddb/ddb.h
index d559978..57c5fd1 100644
--- a/sys/ddb/ddb.h
+++ b/sys/ddb/ddb.h
@@ -80,6 +80,8 @@ typedef void db_cmdfcn_t(db_expr_t addr, boolean_t have_addr, db_expr_t count,
 	DB_FUNC(cmd_name, func_name, db_cmd_set, 0, NULL)
 #define DB_SHOW_COMMAND(cmd_name, func_name) \
 	DB_FUNC(cmd_name, func_name, db_show_cmd_set, 0, NULL)
+#define DB_SHOW_ALL_COMMAND(cmd_name, func_name) \
+	DB_FUNC(cmd_name, func_name, db_show_all_cmd_set, 0, NULL)
 
 #define	DB_SET(cmd_name, func_name, set, flag, more)		\
 static const struct command __CONCAT(cmd_name,_cmd) = {		\