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diff --git a/usr.bin/at/privs.h b/usr.bin/at/privs.h
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+/*	$NetBSD: privs.h,v 1.10 2016/03/13 00:33:12 dholland Exp $	*/
+
+/*
+ *  privs.h - header for privileged operations
+ *  Copyright (C) 1993  Thomas Koenig
+ *
+ * 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. The name of the author(s) may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``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(S) 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, WETHER 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.
+ *
+ * From: OpenBSD: privs.h,v 1.4 1997/03/01 23:40:12 millert Exp
+ */
+
+#ifndef _PRIVS_H_
+#define _PRIVS_H_
+
+/*
+ * Used by: usr.bin/at
+ * Used by: libexec/atrun
+ */
+
+/*
+ * Relinquish privileges temporarily for a setuid or setgid program
+ * with the option of getting them back later.  This is done by
+ * using POSIX saved user and groups ids.  Call RELINQUISH_PRIVS once
+ * at the beginning of the main program.  This will cause all operations
+ * to be executed with the real userid.  When you need the privileges
+ * of the setuid/setgid invocation, call PRIV_START; when you no longer
+ * need it, call PRIV_END.  Note that it is an error to call PRIV_START
+ * and not PRIV_END within the same function.
+ *
+ * Use RELINQUISH_PRIVS_ROOT(a,b) if your program started out running
+ * as root, and you want to drop back the effective userid to a
+ * and the effective group id to b, with the option to get them back
+ * later.
+ *
+ * Problems: Do not use return between PRIV_START and PRIV_END; this
+ * will cause the program to continue running in an unprivileged
+ * state.
+ *
+ * It is NOT safe to call exec(), system() or popen() with a user-
+ * supplied program (i.e. without carefully checking PATH and any
+ * library load paths) with relinquished privileges; the called program
+ * can acquire them just as easily.  Set both effective and real userid
+ * to the real userid before calling any of them.
+ */
+
+extern uid_t real_uid, effective_uid;
+extern gid_t real_gid, effective_gid;
+
+void privs_relinquish(void);
+void privs_relinquish_root(uid_t ruid, gid_t rgid);
+
+void privs_enter(void);
+void privs_exit(void);
+
+/* caller provides this */
+__dead void privs_fail(const char *msg);
+
+#endif /* _PRIV_H_ */