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diff --git a/sys/sys/_sigaltstack.h b/sys/sys/_sigaltstack.h
new file mode 100644
--- /dev/null
+++ b/sys/sys/_sigaltstack.h
@@ -0,0 +1,65 @@
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 1982, 1986, 1989, 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ * (c) UNIX System Laboratories, Inc.
+ * All or some portions of this file are derived from material licensed
+ * to the University of California by American Telephone and Telegraph
+ * Co. or Unix System Laboratories, Inc. and are reproduced herein with
+ * the permission of UNIX System Laboratories, Inc.
+ *
+ * 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.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+ */
+
+#ifndef _SYS__SIGALTSTACK_H_
+#define _SYS__SIGALTSTACK_H_
+
+#include <sys/_types.h>
+
+#if __XSI_VISIBLE
+#if __BSD_VISIBLE
+#define __stack_t sigaltstack
+#endif
+typedef struct __stack_t stack_t;
+
+#define SS_ONSTACK 0x0001 /* take signal on alternate stack */
+#define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */
+#define MINSIGSTKSZ __MINSIGSTKSZ /* minimum stack size */
+#define SIGSTKSZ (MINSIGSTKSZ + 32768) /* recommended stack size */
+#endif
+
+/*
+ * Structure used in sigaltstack call. Its definition is always
+ * needed for __ucontext. If __BSD_VISIBLE is defined, the structure
+ * tag is actually sigaltstack.
+ */
+struct __stack_t {
+ void *ss_sp; /* signal stack base */
+ __size_t ss_size; /* signal stack length */
+ int ss_flags; /* SS_DISABLE and/or SS_ONSTACK */
+};
+
+#endif /* !_SYS__SIGALTSTACK_H_ */
diff --git a/sys/sys/signal.h b/sys/sys/signal.h
--- a/sys/sys/signal.h
+++ b/sys/sys/signal.h
@@ -40,6 +40,7 @@
#include <sys/cdefs.h>
#include <sys/_types.h>
#include <sys/_sigset.h>
+#include <sys/_sigaltstack.h>
#include <machine/_limits.h> /* __MINSIGSTKSZ */
#include <machine/signal.h> /* sig_atomic_t; trap codes; sigcontext */
@@ -426,29 +427,6 @@
typedef void __siginfohandler_t(int, struct __siginfo *, void *);
#endif
-#if __XSI_VISIBLE
-#if __BSD_VISIBLE
-#define __stack_t sigaltstack
-#endif
-typedef struct __stack_t stack_t;
-
-#define SS_ONSTACK 0x0001 /* take signal on alternate stack */
-#define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */
-#define MINSIGSTKSZ __MINSIGSTKSZ /* minimum stack size */
-#define SIGSTKSZ (MINSIGSTKSZ + 32768) /* recommended stack size */
-#endif
-
-/*
- * Structure used in sigaltstack call. Its definition is always
- * needed for __ucontext. If __BSD_VISIBLE is defined, the structure
- * tag is actually sigaltstack.
- */
-struct __stack_t {
- void *ss_sp; /* signal stack base */
- __size_t ss_size; /* signal stack length */
- int ss_flags; /* SS_DISABLE and/or SS_ONSTACK */
-};
-
#if __BSD_VISIBLE
/*
* 4.3 compatibility:

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