From 0ed1d6fb00b8f22c82c3f9054c6dd16eb12469d2 Mon Sep 17 00:00:00 2001
From: Xin LI <delphij@FreeBSD.org>
Date: Thu, 1 Aug 2019 06:35:33 +0000
Subject: Allow Kernel to link in both legacy libkern/zlib and new
 sys/contrib/zlib, with an eventual goal to convert all legacl zlib callers to
 the new zlib version:

 * Move generic zlib shims that are not specific to zlib 1.0.4 to
   sys/dev/zlib.
 * Connect new zlib (1.2.11) to the zlib kernel module, currently built
   with Z_SOLO.
 * Prefix the legacy zlib (1.0.4) with 'zlib104_' namespace.
 * Convert sys/opencrypto/cryptodeflate.c to use new zlib.
 * Remove bundled zlib 1.2.3 from ZFS and adapt it to new zlib and make
   it depend on the zlib module.
 * Fix Z_SOLO build of new zlib.

PR:		229763
Submitted by:	Yoshihiro Ota <ota j email ne jp>
Reviewed by:	markm (sys/dev/zlib/zlib_kmod.c)
Relnotes:	yes
Differential Revision:	https://reviews.freebsd.org/D19706
---
 sys/dev/zlib/zlib_mod.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 sys/dev/zlib/zlib_mod.c

(limited to 'sys/dev/zlib/zlib_mod.c')

diff --git a/sys/dev/zlib/zlib_mod.c b/sys/dev/zlib/zlib_mod.c
new file mode 100644
index 000000000000..58f40214d3ce
--- /dev/null
+++ b/sys/dev/zlib/zlib_mod.c
@@ -0,0 +1,53 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2019 The FreeBSD Foundation
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/param.h>
+#include <sys/time.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+
+static int
+zlib_modevent(module_t mod, int type, void *unused)
+{
+	switch (type) {
+	case MOD_LOAD:
+		return 0;
+	case MOD_UNLOAD:
+		return 0;
+	}
+	return EINVAL;
+}
+
+static moduledata_t zlib_mod = {
+	"zlib",
+	zlib_modevent,
+	0
+};
+DECLARE_MODULE(zlib, zlib_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
+MODULE_VERSION(zlib, 1);
-- 
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