libspl: init/fini

Sponsored-by: https://despairlabs.com/sponsor/
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Closes #17861

lib/libspl/Makefile.am

@@ -21,6 +21,7 @@ libspl_la_SOURCES = \
 	%D%/getexecname.c \
 	%D%/kmem.c \
 	%D%/kstat.c \
+	%D%/libspl.c \
 	%D%/list.c \
 	%D%/mkdirp.c \
 	%D%/mutex.c \

lib/libspl/include/Makefile.am

@@ -4,6 +4,7 @@ libspl_HEADERS = \
 	%D%/atomic.h \
 	%D%/libgen.h \
 	%D%/libshare.h \
+	%D%/libspl.h \
 	%D%/statcommon.h \
 	%D%/stdlib.h \
 	%D%/string.h \

lib/libspl/include/libspl.h

@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: CDDL-1.0
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or https://opensource.org/licenses/CDDL-1.0.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright (c) 2025, Rob Norris <robn@despairlabs.com>
+ */
+
+#ifndef _LIBSPL_H
+#define	_LIBSPL_H extern __attribute__((visibility("default")))
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+_LIBSPL_H void libspl_init(void);
+_LIBSPL_H void libspl_fini(void);
+
+#ifdef __cplusplus
+};
+#endif
+
+#endif /* _LIBSPL_H */

lib/libspl/libspl.c

@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: CDDL-1.0
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or https://opensource.org/licenses/CDDL-1.0.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright (c) 2025, Rob Norris <robn@despairlabs.com>
+ */
+
+#include <libspl.h>
+
+void
+libspl_init(void)
+{
+}
+
+void
+libspl_fini(void)
+{
+}

lib/libzpool/kernel.c

@@ -505,6 +505,8 @@ kernel_init(int mode)
 {
 	extern uint_t rrw_tsd_key;
 
+	libspl_init();
+
 	umem_nofail_callback(umem_out_of_memory);
 
 	physmem = sysconf(_SC_PHYS_PAGES);
@@ -543,6 +545,8 @@ kernel_fini(void)
 	system_taskq_fini();
 
 	random_fini();
+
+	libspl_fini();
 }
 
 int