From 5fa29797910346fc0c54829bd979856e83b9b7ea Mon Sep 17 00:00:00 2001
From: Warner Losh <imp@FreeBSD.org>
Date: Thu, 23 Aug 2018 05:05:47 +0000
Subject: Create devctl freeze/thaw.

This adds it to devctl, libdevctl, defines the two IOCTLs and
implements the kernel bits. causes any new drivers that are added via
kldload to be deferred until a 'thaw' comes in. These do not stack: it
is an error to freeze while frozen, or thaw while thawed.

Differential Revision: https://reviews.freebsd.org/D16735
---
 lib/libdevctl/devctl.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'lib/libdevctl/devctl.c')

diff --git a/lib/libdevctl/devctl.c b/lib/libdevctl/devctl.c
index 5013fb0b9d57..9c9ab7805672 100644
--- a/lib/libdevctl/devctl.c
+++ b/lib/libdevctl/devctl.c
@@ -145,3 +145,17 @@ devctl_delete(const char *device, bool force)
 	return (devctl_simple_request(DEV_DELETE, device, force ?
 	    DEVF_FORCE_DELETE : 0));
 }
+
+int
+devctl_freeze(void)
+{
+
+	return (devctl_simple_request(DEV_FREEZE, "", 0));
+}
+
+int
+devctl_thaw(void)
+{
+
+	return (devctl_simple_request(DEV_THAW, "", 0));
+}
-- 
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