add APM powerhooks.

from NetBSD, Sat Jun 26 08:25:25 1999 UTC by augustss:

Add powerhooks, i.e., the ability to register a function that will be
called when the machine does a suspend or resume.
XXX Will go away when Jason's kevents come to life.

1 files changed, 67 insertions, 1 deletions

diff --git a/sys/kern/kern_subr.c b/sys/kern/kern_subr.c
index be226f857e8..4a6321e1896 100644
--- a/sys/kern/kern_subr.c
+++ b/sys/kern/kern_subr.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: kern_subr.c,v 1.9 1999/04/28 09:28:15 art Exp $	*/
+/*	$OpenBSD: kern_subr.c,v 1.10 1999/11/07 17:39:14 provos Exp $	*/
 /*	$NetBSD: kern_subr.c,v 1.15 1996/04/09 17:21:56 ragge Exp $	*/
 
 /*
@@ -249,3 +249,69 @@ doshutdownhooks()
 	    dp->sfd_list.le_next)
 		(*dp->sfd_fn)(dp->sfd_arg);
 }
+
+/*
+ * "Power hook" types, functions, and variables.
+ */
+
+struct powerhook_desc {
+	LIST_ENTRY(powerhook_desc) sfd_list;
+	void	(*sfd_fn) __P((int, void *));
+	void	*sfd_arg;
+};
+
+LIST_HEAD(, powerhook_desc) powerhook_list;
+
+void *
+powerhook_establish(fn, arg)
+	void (*fn) __P((int, void *));
+	void *arg;
+{
+	struct powerhook_desc *ndp;
+
+	ndp = (struct powerhook_desc *)
+	    malloc(sizeof(*ndp), M_DEVBUF, M_NOWAIT);
+	if (ndp == NULL)
+		return NULL;
+
+	ndp->sfd_fn = fn;
+	ndp->sfd_arg = arg;
+	LIST_INSERT_HEAD(&powerhook_list, ndp, sfd_list);
+
+	return (ndp);
+}
+
+void
+powerhook_disestablish(vhook)
+	void *vhook;
+{
+#ifdef DIAGNOSTIC
+	struct powerhook_desc *dp;
+
+	for (dp = powerhook_list.lh_first; dp != NULL;
+	    dp = dp->sfd_list.le_next)
+                if (dp == vhook)
+			break;
+	if (dp == NULL)
+		panic("powerhook_disestablish: hook not established");
+#endif
+
+	LIST_REMOVE((struct powerhook_desc *)vhook, sfd_list);
+	free(vhook, M_DEVBUF);
+}
+
+/*
+ * Run power hooks.
+ */
+void
+dopowerhooks(why)
+	int why;
+{
+	struct powerhook_desc *dp;
+
+	for (dp = LIST_FIRST(&powerhook_list); 
+	     dp != NULL; 
+	     dp = LIST_NEXT(dp, sfd_list)) {
+		(*dp->sfd_fn)(why, dp->sfd_arg);
+	}
+}