Parse the ! lines that will soon be coming from the kernel. These are

a generalized notification mechanism for subsystems wishing to report
events.

Revieded by: njl

# The kernel side seems like it might be causing panics for me, but should
# be forthcoming shortly.

sbin/devd/devd.cc

@@ -67,6 +67,7 @@ using namespace std;
 extern FILE *yyin;
 extern int lineno;
 
+static const char notify = '!';
 static const char nomatch = '?';
 static const char attach = '+';
 static const char detach = '-';
@@ -219,6 +220,7 @@ config::reset(void)
 	delete_and_clear(_attach_list);
 	delete_and_clear(_detach_list);
 	delete_and_clear(_nomatch_list);
+	delete_and_clear(_notify_list);
 }
 
 void
@@ -282,6 +284,7 @@ config::parse(void)
 	sort_vector(_attach_list);
 	sort_vector(_detach_list);
 	sort_vector(_nomatch_list);
+	sort_vector(_notify_list);
 }
 
 void
@@ -325,6 +328,13 @@ config::add_nomatch(int prio, event_proc *p)
 	_nomatch_list.push_back(p);
 }
 
+void
+config::add_notify(int prio, event_proc *p)
+{
+	p->set_priority(prio);
+	_notify_list.push_back(p);
+}
+
 void
 config::set_pidfile(const char *fn)
 {
@@ -501,6 +511,10 @@ config::find_and_execute(char type)
 	switch (type) {
 	default:
 		return;
+	case notify:
+		l = &_notify_list;
+		s = "notify";
+		break;
 	case nomatch:
 		l = &_nomatch_list;
 		s = "nomatch";
@@ -539,7 +553,21 @@ process_event(char *buffer)
 	cfg.push_var_table();
 	// No match doesn't have a device, and the format is a little
 	// different, so handle it separately.
-	if (type != nomatch) {
+	switch (type) {
+	case notify:
+		sp = cfg.set_vars(sp);
+		break;
+	case nomatch:
+		//?vars at location on bus
+		sp = cfg.set_vars(sp);
+		if (strncmp(sp, "at ", 3) == 0)
+			sp += 3;
+		sp = cfg.set_vars(sp);
+		if (strncmp(sp, "on ", 3) == 0)
+			cfg.set_variable("bus", sp + 3);
+		break;
+	case attach:	/*FALLTHROUGH*/
+	case detach:
 		sp = strchr(sp, ' ');
 		if (sp == NULL)
 			return;	/* Can't happen? */
@@ -550,14 +578,7 @@ process_event(char *buffer)
 		sp = cfg.set_vars(sp);
 		if (strncmp(sp, "on ", 3) == 0)
 			cfg.set_variable("bus", sp + 3);
-	} else {
-		//?vars at location on bus
-		sp = cfg.set_vars(sp);
-		if (strncmp(sp, "at ", 3) == 0)
-			sp += 3;
-		sp = cfg.set_vars(sp);
-		if (strncmp(sp, "on ", 3) == 0)
-			cfg.set_variable("bus", sp + 3);
+		break;
 	}
 	
 	cfg.find_and_execute(type);
@@ -643,6 +664,12 @@ add_nomatch(int prio, event_proc *p)
 	cfg.add_nomatch(prio, p);
 }
 
+void
+add_notify(int prio, event_proc *p)
+{
+	cfg.add_notify(prio, p);
+}
+
 event_proc *
 add_to_event_proc(event_proc *ep, eps *eps)
 {

sbin/devd/devd.h

@@ -40,6 +40,7 @@ void add_attach(int, struct event_proc *);
 void add_detach(int, struct event_proc *);
 void add_directory(const char *);
 void add_nomatch(int, struct event_proc *);
+void add_notify(int, struct event_proc *);
 struct event_proc *add_to_event_proc(struct event_proc *, struct eps *);
 struct eps *new_match(const char *, const char *);
 struct eps *new_action(const char *);

sbin/devd/devd.hh

@@ -133,6 +133,7 @@ public:
 	void add_detach(int, event_proc *);
 	void add_directory(const char *);
 	void add_nomatch(int, event_proc *);
+	void add_notify(int, event_proc *);
 	void set_pidfile(const char *);
 	void reset();
 	void parse();
@@ -158,6 +159,7 @@ private:
 	std::vector<event_proc *> _attach_list;
 	std::vector<event_proc *> _detach_list;
 	std::vector<event_proc *> _nomatch_list;
+	std::vector<event_proc *> _notify_list;
 };
 
 #endif /* DEVD_HH */

sbin/devd/parse.y

@@ -47,7 +47,7 @@
 %token <str> STRING
 %token <str> ID
 %token OPTIONS SET DIRECTORY PID_FILE DEVICE_NAME ACTION MATCH
-%token ATTACH DETACH NOMATCH
+%token ATTACH DETACH NOMATCH NOTIFY
 
 %type <eventproc> match_or_action_list
 %type <eps> match_or_action match action
@@ -69,6 +69,7 @@ config
 	| attach_block
 	| detach_block
 	| nomatch_block
+	| notify_block
 	;
 
 option_block
@@ -115,6 +116,12 @@ nomatch_block
 	| NOMATCH NUMBER BEGINBLOCK ENDBLOCK SEMICOLON
 	;
 
+notify_block
+	: NOTIFY NUMBER BEGINBLOCK match_or_action_list ENDBLOCK SEMICOLON
+		{ add_notify($2, $4); }
+	| NOTIFY NUMBER BEGINBLOCK ENDBLOCK SEMICOLON
+	;
+
 match_or_action_list
 	: match_or_action { $$ = add_to_event_proc( NULL, $1); }
 	| match_or_action_list match_or_action

sbin/devd/token.l

@@ -93,6 +93,7 @@ device-name		{ return DEVICE_NAME; }
 action			{ return ACTION; }
 match			{ return MATCH; }
 nomatch			{ return NOMATCH; }
+notify			{ return NOTIFY; }
 [A-Za-z][A-Za-z0-9_-]*	{
 				yylval.str = strdup(yytext);
 				return ID;