Change the definition of NULL on ia64 (for LP64 compilations) from

an int constant to a long constant. This change improves consistency
in the following two ways:
1. The first 8 arguments are always passed in registers on ia64, which
   by virtue of the generated code implicitly widens ints to longs and
   allows the use of an 32-bit integral type for 64-bit arguments.
   Subsequent arguments are passed onto the memory stack, which does
   not exhibit the same behaviour and consequently do not allow this.
   In practice this means that variadic functions taking pointers
   and given NULL (without cast) work as long as the NULL is passed
   in one of the first 8 arguments. A SIGSEGV is more likely the
   result if such would be done for stack-based arguments. This is
   due to the fact that the upper 4 bytes remain undefined.
2. All 64-bit platforms that FreeBSD supports, with the obvious
   exception of ia64, allow 32-bit integral types (specifically NULL)
   when 64-bit pointers are expected in variadic functions by way of
   how the compiler generates code. As such, code that works correctly
   (whether rightfully so or not) on any platform other than ia64, may
   fail on ia64.

To more easily allow tweaking of the definition of NULL, this commit
removes the 12 definitions in the various headers and puts it in a
new header that can be included whenever NULL is to be made visible.

This commit fixes GNOME, emacs, xemacs and a whole bunch of ports
that I don't particularly care about at this time...

include/dirent.h

@@ -54,6 +54,8 @@
 
 #if __BSD_VISIBLE
 
+#include <sys/_null.h>
+
 /* definitions for library routines operating on directories. */
 #define	DIRBLKSIZ	1024
 
@@ -81,10 +83,6 @@ typedef struct _dirdesc {
 #define DTF_REWIND	0x0004	/* rewind after reading union stack */
 #define __DTF_READALL	0x0008	/* everything has been read */
 
-#ifndef NULL
-#define	NULL	0
-#endif
-
 #else /* !__BSD_VISIBLE */
 
 typedef	void *	DIR;

include/locale.h

@@ -37,6 +37,8 @@
 #ifndef _LOCALE_H_
 #define _LOCALE_H_
 
+#include <sys/_null.h>
+
 struct lconv {
 	char	*decimal_point;
 	char	*thousands_sep;
@@ -64,10 +66,6 @@ struct lconv {
 	char	int_n_sign_posn;
 };
 
-#ifndef NULL
-#define	NULL	0
-#endif
-
 #define	LC_ALL		0
 #define	LC_COLLATE	1
 #define	LC_CTYPE	2

include/rpc/types.h

@@ -40,6 +40,7 @@
 #define _RPC_TYPES_H
 
 #include <sys/types.h>
+#include <sys/_null.h>
 
 typedef int32_t bool_t;
 typedef int32_t enum_t;
@@ -59,9 +60,6 @@ typedef   int32_t rpc_inline_t;
 #ifndef TRUE
 #	define TRUE	(1)
 #endif
-#ifndef NULL
-#	define NULL	0
-#endif
 
 #define mem_alloc(bsize)	calloc(1, bsize)
 #define mem_free(ptr, bsize)	free(ptr)

include/stddef.h

@@ -39,6 +39,7 @@
 #define _STDDEF_H_
 
 #include <sys/cdefs.h>
+#include <sys/_null.h>
 #include <sys/_types.h>
 
 typedef	__ptrdiff_t	ptrdiff_t;
@@ -62,10 +63,6 @@ typedef	__wchar_t	wchar_t;
 #endif
 #endif
 
-#ifndef	NULL
-#define	NULL	0
-#endif
-
 #define	offsetof(type, member)	__offsetof(type, member)
 
 #endif /* _STDDEF_H_ */

include/stdio.h

@@ -41,6 +41,7 @@
 #define	_STDIO_H_
 
 #include <sys/cdefs.h>
+#include <sys/_null.h>
 #include <sys/_types.h>
 
 typedef	__off_t		fpos_t;
@@ -57,10 +58,6 @@ typedef	__va_list	va_list;
 #endif
 #endif
 
-#ifndef NULL
-#define	NULL	0
-#endif
-
 #define	_FSTDIO			/* Define for new stdio with functions. */
 
 /*

include/stdlib.h

@@ -38,6 +38,7 @@
 #define	_STDLIB_H_
 
 #include <sys/cdefs.h>
+#include <sys/_null.h>
 #include <sys/_types.h>
 
 #if __BSD_VISIBLE
@@ -69,10 +70,6 @@ typedef struct {
 	long	rem;
 } ldiv_t;
 
-#ifndef NULL
-#define	NULL	0
-#endif
-
 #define	EXIT_FAILURE	1
 #define	EXIT_SUCCESS	0
 

include/string.h

@@ -38,6 +38,7 @@
 #define	_STRING_H_
 
 #include <sys/cdefs.h>
+#include <sys/_null.h>
 #include <sys/_types.h>
 
 /*
@@ -53,10 +54,6 @@ typedef	__size_t	size_t;
 #define	_SIZE_T_DECLARED
 #endif
 
-#ifndef	NULL
-#define	NULL	0
-#endif
-
 __BEGIN_DECLS
 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
 void	*memccpy(void * __restrict, const void * __restrict, int, size_t);

include/time.h

@@ -46,6 +46,7 @@
 #define	_TIME_H_
 
 #include <sys/cdefs.h>
+#include <sys/_null.h>
 #include <sys/_types.h>
 
 #if __POSIX_VISIBLE > 0 && __POSIX_VISIBLE < 200112 || __BSD_VISIBLE
@@ -59,10 +60,6 @@
 /* Frequency of the clock ticks reported by clock().  */
 #define	CLOCKS_PER_SEC	128
 
-#ifndef	NULL
-#define	NULL	0
-#endif
-
 #ifndef _CLOCK_T_DECLARED
 typedef	__clock_t	clock_t;
 #define	_CLOCK_T_DECLARED

include/unistd.h

@@ -40,6 +40,7 @@
 #include <sys/cdefs.h>
 #include <sys/types.h>			/* XXX adds too much pollution. */
 #include <sys/unistd.h>
+#include <sys/_null.h>
 #include <sys/_types.h>
 
 #ifndef _GID_T_DECLARED
@@ -81,10 +82,6 @@ typedef	__useconds_t	useconds_t;
 #define	STDOUT_FILENO	1	/* standard output file descriptor */
 #define	STDERR_FILENO	2	/* standard error file descriptor */
 
-#ifndef NULL
-#define	NULL		0	/* null pointer constant */
-#endif
-
 #if __XSI_VISIBLE || __POSIX_VISIBLE >= 200112
 #define	F_ULOCK		0	/* unlock locked section */
 #define	F_LOCK		1	/* lock a section for exclusive use */

include/wchar.h

@@ -68,13 +68,10 @@
 #define _WCHAR_H_
 
 #include <sys/cdefs.h>
+#include <sys/_null.h>
 #include <sys/_types.h>
 #include <machine/_limits.h>
 
-#ifndef NULL
-#define	NULL	0
-#endif
-
 #ifndef _MBSTATE_T_DECLARED
 typedef	__mbstate_t	mbstate_t;
 #define	_MBSTATE_T_DECLARED

sys/rpc/types.h

@@ -40,6 +40,7 @@
 #define _RPC_TYPES_H
 
 #include <sys/types.h>
+#include <sys/_null.h>
 
 typedef int32_t bool_t;
 typedef int32_t enum_t;
@@ -59,9 +60,6 @@ typedef   int32_t rpc_inline_t;
 #ifndef TRUE
 #	define TRUE	(1)
 #endif
-#ifndef NULL
-#	define NULL	0
-#endif
 
 #define mem_alloc(bsize)	calloc(1, bsize)
 #define mem_free(ptr, bsize)	free(ptr)

sys/sys/_null.h

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2003 Marcel Moolenaar
+ * All rights reserved.
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef NULL
+
+#ifdef __LP64__
+#define	NULL	0L
+#else
+#define	NULL	0
+#endif
+
+#endif

sys/sys/param.h

@@ -42,6 +42,8 @@
 #ifndef _SYS_PARAM_H_
 #define _SYS_PARAM_H_
 
+#include <sys/_null.h>
+
 #define	BSD	199506		/* System version (year & month). */
 #define BSD4_3	1
 #define BSD4_4	1
@@ -59,10 +61,6 @@
 #undef __FreeBSD_version
 #define __FreeBSD_version 502100	/* Master, propagated to newvers */
 
-#ifndef NULL
-#define	NULL	0
-#endif
-
 #ifndef LOCORE
 #include <sys/types.h>
 #endif

sys/sys/stddef.h

@@ -30,14 +30,11 @@
 #define _SYS_STDDEF_H_
 
 #include <sys/cdefs.h>
+#include <sys/_null.h>
 #include <machine/_types.h>
 
 typedef	__ptrdiff_t	ptrdiff_t;
 
 #define	offsetof(type, field)	__offsetof(type, field)
 
-#ifndef NULL
-#define	NULL	0
-#endif
-
 #endif /* !_SYS_STDDEF_H_ */