New function tty_num_active()

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

tty.c

@@ -118,6 +118,19 @@ size_t tty_num(void)
 	return num;
 }
 
+size_t tty_num_active(void)
+{
+	size_t num = 0;
+	tty_node_t *entry;
+
+	LIST_FOREACH(entry, &tty_list, link) {
+		if (entry->data.pid)
+			num++;
+	}
+
+	return num;
+}
+
 tty_node_t *tty_find_by_pid(pid_t pid)
 {
 	tty_node_t *entry;

tty.h

@@ -49,6 +49,7 @@ typedef struct tty_node {
 int	    tty_register    (char *line);
 tty_node_t *tty_find	    (char *dev);
 size_t	    tty_num	    (void);
+size_t      tty_num_active  (void);
 tty_node_t *tty_find_by_pid (pid_t pid);
 void	    tty_start	    (finit_tty_t *tty);
 void	    tty_stop	    (finit_tty_t *tty);