libspl: move utsname() etc to sys/misc.h; initialise in libspl_init()

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

include/sys/zfs_context.h

@@ -113,7 +113,6 @@ extern "C" {
 #include <sys/sysevent/eventdefs.h>
 #include <sys/sunddi.h>
 #include <sys/debug.h>
-#include <sys/utsname.h>
 #include <sys/trace_zfs.h>
 
 #include <sys/mutex.h>
@@ -131,6 +130,7 @@ extern "C" {
 #include <sys/callb.h>
 #include <sys/trace.h>
 #include <sys/systm.h>
+#include <sys/misc.h>
 
 #include <sys/zfs_context_os.h>
 
@@ -267,9 +267,6 @@ extern uint32_t zone_get_hostid(void *zonep);
 extern int ddi_strtoull(const char *str, char **nptr, int base,
     u_longlong_t *result);
 
-typedef struct utsname	utsname_t;
-extern utsname_t *utsname(void);
-
 /* ZFS Boot Related stuff. */
 
 struct _buf {

lib/libspl/include/Makefile.am

@@ -43,6 +43,7 @@ libspl_sys_HEADERS = \
 	%D%/sys/kstat.h \
 	%D%/sys/list.h \
 	%D%/sys/list_impl.h \
+	%D%/sys/misc.h \
 	%D%/sys/mhd.h \
 	%D%/sys/mkdev.h \
 	%D%/sys/mod.h \

lib/libspl/include/sys/misc.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) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
+ * Copyright (c) 2012, 2018 by Delphix. All rights reserved.
+ * Copyright (c) 2012, Joyent, Inc. All rights reserved.
+ */
+
+#ifndef _LIBSPL_SYS_MISC_H
+#define	_LIBSPL_SYS_MISC_H
+
+#include <sys/utsname.h>
+
+/*
+ * Hostname information
+ */
+typedef struct utsname	utsname_t;
+extern utsname_t *utsname(void);
+
+#endif

lib/libspl/libspl.c

@@ -28,14 +28,26 @@
  */
 
 #include <libspl.h>
+#include <assert.h>
 #include <unistd.h>
+#include <sys/misc.h>
+#include <sys/utsname.h>
 
 uint64_t physmem;
+struct utsname hw_utsname;
+
+utsname_t *
+utsname(void)
+{
+	return (&hw_utsname);
+}
 
 void
 libspl_init(void)
 {
 	physmem = sysconf(_SC_PHYS_PAGES);
+
+	VERIFY0(uname(&hw_utsname));
 }
 
 void

lib/libzpool/kernel.c

@@ -44,7 +44,6 @@
 #include <sys/systeminfo.h>
 #include <sys/time.h>
 #include <sys/tsd.h>
-#include <sys/utsname.h>
 
 #include <libspl.h>
 #include <libzpool.h>
@@ -61,7 +60,6 @@
  */
 
 uint32_t hostid;
-struct utsname hw_utsname;
 
 /* If set, all blocks read will be copied to the specified directory. */
 char *vn_dumpdir = NULL;
@@ -405,12 +403,6 @@ ddi_strtoull(const char *str, char **nptr, int base, u_longlong_t *result)
 	return (0);
 }
 
-utsname_t *
-utsname(void)
-{
-	return (&hw_utsname);
-}
-
 /*
  * =========================================================================
  * kernel emulation setup & teardown
@@ -515,8 +507,6 @@ kernel_init(int mode)
 
 	random_init();
 
-	VERIFY0(uname(&hw_utsname));
-
 	system_taskq_init();
 	icp_init();