Use attribute((sentinel)) on functions where it makes sense.

(this will warn if they are used without a terminating NULL pointer.
Note *pointer*, very useful for arches where 0 != (void *)0, in size)
okay millert@

src/include/bsd_auth.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: bsd_auth.h,v 1.5 2002/03/12 02:28:11 millert Exp $	*/
+/*	$OpenBSD: bsd_auth.h,v 1.6 2002/06/05 19:27:50 espie Exp $	*/
 
 /*-
  * Copyright (c) 1997 Berkeley Software Design, Inc. All rights reserved.
@@ -58,7 +58,9 @@ char	*auth_getitem(auth_session_t *, auth_item_t);
 int	 auth_setitem(auth_session_t *, auth_item_t, char *);
 
 auth_session_t *auth_open(void);
-auth_session_t *auth_verify(auth_session_t *, char *, char *, ...);
+auth_session_t *auth_verify(auth_session_t *, char *, char *, ...)
+		    __attribute__((sentinel));
+
 auth_session_t *auth_userchallenge(char *, char *, char *, char **);
 auth_session_t *auth_usercheck(char *, char *, char *, char *);
 
@@ -76,7 +78,8 @@ void	 auth_setenv(auth_session_t *);
 void	 auth_clrenv(auth_session_t *);
 
 void	 auth_setstate(auth_session_t *, int);
-int	 auth_call(auth_session_t *, char *, ...);
+int	 auth_call(auth_session_t *, char *, ...) 
+	    __attribute__((sentinel));
 
 int	 auth_setdata(auth_session_t *, void *, size_t);
 int	 auth_setoption(auth_session_t *, char *, char *);

src/include/unistd.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: unistd.h,v 1.37 2002/02/17 19:42:21 millert Exp $ */
+/*	$OpenBSD: unistd.h,v 1.38 2002/06/05 19:27:50 espie Exp $ */
 /*	$NetBSD: unistd.h,v 1.26.4.1 1996/05/28 02:31:51 mrg Exp $	*/
 
 /*-
@@ -66,9 +66,12 @@ size_t	 confstr(int, char *, size_t);
 char	*cuserid(char *);
 int	 dup(int);
 int	 dup2(int, int);
-int	 execl(const char *, const char *, ...);
-int	 execle(const char *, const char *, ...);
-int	 execlp(const char *, const char *, ...);
+int	 execl(const char *, const char *, ...) 
+	    __attribute__((sentinel));
+int	 execle(const char *, const char *, ...) 
+	    __attribute__((sentinel));
+int	 execlp(const char *, const char *, ...) 
+	    __attribute__((sentinel));
 int	 execv(const char *, char * const *);
 int	 execve(const char *, char * const *, char * const *);
 int	 execvp(const char *, char * const *);