diff --git a/include/arpa/inet.h b/include/arpa/inet.h
index fe60747a0da9..f3ce59563080 100644
--- a/include/arpa/inet.h
+++ b/include/arpa/inet.h
@@ -60,12 +60,44 @@
 
 /* External definitions for functions in inet(3), addr2ascii(3) */
 
-#include <sys/types.h>
 #include <sys/cdefs.h>
+#include <machine/ansi.h>
 
-struct in_addr;
+#ifndef	_IN_ADDR_T_DECLARED_
+typedef	__uint32_t	in_addr_t;
+#define	_IN_ADDR_T_DECLARED_
+#endif
+
+#ifndef	_IN_PORT_T_DECLARED_
+typedef	_uint16_t	in_port_t;
+#define	_IN_PORT_T_DECLARED_
+#endif
+
+#ifndef _POSIX_SOURCE
+#ifdef	_BSD_SIZE_T_
+typedef	_BSD_SIZE_T_	size_t;
+#undef	_BSD_SIZE_T_
+#endif
+#endif /* !_POSIX_SOURCE */
+
+/*
+ * XXX socklen_t is used by a POSIX.1-200x interface, but not required by
+ * POSIX.1-200x.
+ */
+#ifdef	_BSD_SOCKLEN_T_
+typedef	_BSD_SOCKLEN_T_	socklen_t;
+#undef	_BSD_SOCKLEN_T_
+#endif
+
+#ifndef _STRUCT_IN_ADDR_DECLARED
+struct in_addr {
+	in_addr_t s_addr;
+};
+#define	_STRUCT_IN_ADDR_DECLARED
+#endif
 
 /* XXX all new diversions!! argh!! */
+#ifndef _POSIX_SOURCE
 #define	inet_addr	__inet_addr
 #define	inet_aton	__inet_aton
 #define	inet_lnaof	__inet_lnaof
@@ -80,11 +112,21 @@ struct in_addr;
 #define	inet_ntop	__inet_ntop
 #define	inet_nsap_addr	__inet_nsap_addr
 #define	inet_nsap_ntoa	__inet_nsap_ntoa
+#endif /* !_POSIX_SOURCE */
 
 __BEGIN_DECLS
+in_addr_t	 inet_addr __P((const char *));
+char		*inet_ntoa __P((struct in_addr));
+const char	*inet_ntop __P((int, const void *, char *, socklen_t));
+int		 inet_pton __P((int, const char *, void *));
+/*
+ * XXX missing: ntohl() family.
+ */
+
+/* Nonstandard functions. */
+#ifndef _POSIX_SOURCE
 int		 ascii2addr __P((int, const char *, void *));
 char		*addr2ascii __P((int, const void *, int, char *));
-in_addr_t	 inet_addr __P((const char *));
 int		 inet_aton __P((const char *, struct in_addr *));
 in_addr_t	 inet_lnaof __P((struct in_addr));
 struct in_addr	 inet_makeaddr __P((in_addr_t, in_addr_t));
@@ -93,11 +135,9 @@ in_addr_t	 inet_netof __P((struct in_addr));
 in_addr_t	 inet_network __P((const char *));
 char		*inet_net_ntop __P((int, const void *, int, char *, size_t));
 int		 inet_net_pton __P((int, const char *, void *, size_t));
-char		*inet_ntoa __P((struct in_addr));
-int              inet_pton __P((int, const char *, void *));
-const char	*inet_ntop __P((int, const void *, char *, size_t));
-u_int		 inet_nsap_addr __P((const char *, u_char *, int));
-char		*inet_nsap_ntoa __P((int, const u_char *, char *));
+unsigned	 inet_nsap_addr __P((const char *, unsigned char *, int));
+char		*inet_nsap_ntoa __P((int, const unsigned char *, char *));
+#endif /* !_POSIX_SOURCE */
 __END_DECLS
 
-#endif /* !_INET_H_ */
+#endif /* !_ARPA_INET_H_ */
diff --git a/lib/libc/net/inet.3 b/lib/libc/net/inet.3
index 3b51129bdf28..ff603fdc6937 100644
--- a/lib/libc/net/inet.3
+++ b/lib/libc/net/inet.3
@@ -62,7 +62,7 @@
 .Ft char *
 .Fn inet_ntoa "struct in_addr in"
 .Ft const char *
-.Fn inet_ntop "int af" "const void *src" "char *dst" "size_t size"
+.Fn inet_ntop "int af" "const void *src" "char *dst" "socklen_t size"
 .Ft int
 .Fn inet_pton "int af" "const char *src" "void *dst"
 .Ft struct in_addr
diff --git a/lib/libc/net/inet_ntop.c b/lib/libc/net/inet_ntop.c
index 0b9449b0d81f..9dbe46b83a89 100644
--- a/lib/libc/net/inet_ntop.c
+++ b/lib/libc/net/inet_ntop.c
@@ -15,9 +15,12 @@
  */
 
 #if defined(LIBC_SCCS) && !defined(lint)
-static char rcsid[] = "$FreeBSD$";
+static char rcsid[] = "$Id: inet_ntop.c,v 8.7 1996/08/05 08:41:18 vixie Exp $";
 #endif /* LIBC_SCCS and not lint */
 
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
 #include <sys/param.h>
 #include <sys/types.h>
 #include <sys/socket.h>
@@ -28,15 +31,17 @@ static char rcsid[] = "$FreeBSD$";
 #include <stdio.h>
 #include <string.h>
 
-#define SPRINTF(x) ((size_t)sprintf x)
+#define SPRINTF(x) ((socklen_t)sprintf x)
 
 /*
  * WARNING: Don't even consider trying to compile this on a system where
  * sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
  */
 
-static const char *inet_ntop4 __P((const u_char *src, char *dst, size_t size));
-static const char *inet_ntop6 __P((const u_char *src, char *dst, size_t size));
+static const char *inet_ntop4 __P((const u_char *src, char *dst,
+    socklen_t size));
+static const char *inet_ntop6 __P((const u_char *src, char *dst,
+    socklen_t size));
 
 /* char *
  * inet_ntop(af, src, dst, size)
@@ -51,7 +56,7 @@ inet_ntop(af, src, dst, size)
 	int af;
 	const void *src;
 	char *dst;
-	size_t size;
+	socklen_t size;
 {
 	switch (af) {
 	case AF_INET:
@@ -80,7 +85,7 @@ static const char *
 inet_ntop4(src, dst, size)
 	const u_char *src;
 	char *dst;
-	size_t size;
+	socklen_t size;
 {
 	static const char fmt[] = "%u.%u.%u.%u";
 	char tmp[sizeof "255.255.255.255"];
@@ -103,7 +108,7 @@ static const char *
 inet_ntop6(src, dst, size)
 	const u_char *src;
 	char *dst;
-	size_t size;
+	socklen_t size;
 {
 	/*
 	 * Note that int32_t and int16_t need only be "at least" large enough
@@ -182,7 +187,7 @@ inet_ntop6(src, dst, size)
 	/*
 	 * Check for overflow, copy, and we're done.
 	 */
-	if ((size_t)(tp - tmp) > size) {
+	if ((socklen_t)(tp - tmp) > size) {
 		errno = ENOSPC;
 		return (NULL);
 	}
diff --git a/sys/alpha/include/ansi.h b/sys/alpha/include/ansi.h
index 3d9d396439ba..fb37f9a10abe 100644
--- a/sys/alpha/include/ansi.h
+++ b/sys/alpha/include/ansi.h
@@ -49,8 +49,6 @@
  */
 #define	_BSD_CLOCK_T_	int			/* clock() */
 #define	_BSD_CLOCKID_T_	int			/* clock_gettime()... */
-#define	_BSD_IN_ADDR_T_	__uint32_t		/* inet(3) functions */
-#define	_BSD_IN_PORT_T_	__uint16_t
 #define	_BSD_MBSTATE_T_	__mbstate_t		/* mbstate_t */
 #define	_BSD_PTRDIFF_T_	long			/* ptr1 - ptr2 */
 #define	_BSD_RUNE_T_	_BSD_CT_RUNE_T_		/* rune_t (see below) */
diff --git a/sys/arm/include/ansi.h b/sys/arm/include/ansi.h
index a2a128ff16dd..4c3f8de92eae 100644
--- a/sys/arm/include/ansi.h
+++ b/sys/arm/include/ansi.h
@@ -49,8 +49,6 @@
  */
 #define	_BSD_CLOCK_T_	int			/* clock() */
 #define	_BSD_CLOCKID_T_	int			/* clockid_t */
-#define	_BSD_IN_ADDR_T_	__uint32_t		/* inet(3) functions */
-#define	_BSD_IN_PORT_T_	__uint16_t
 #define	_BSD_MBSTATE_T_	__mbstate_t		/* mbstate_t */
 #define	_BSD_PTRDIFF_T_	int			/* ptr1 - ptr2 */
 #define	_BSD_RUNE_T_	_BSD_CT_RUNE_T_		/* rune_t (see below) */
diff --git a/sys/i386/include/ansi.h b/sys/i386/include/ansi.h
index b1de8ae2aad7..46407d543e2b 100644
--- a/sys/i386/include/ansi.h
+++ b/sys/i386/include/ansi.h
@@ -48,8 +48,6 @@
  */
 #define	_BSD_CLOCK_T_	unsigned long		/* clock()... */
 #define	_BSD_CLOCKID_T_	int			/* clock_gettime()... */
-#define	_BSD_IN_ADDR_T_	__uint32_t		/* inet(3) functions */	
-#define	_BSD_IN_PORT_T_	__uint16_t	
 #define	_BSD_MBSTATE_T_	__mbstate_t		/* mbstate_t */
 #define	_BSD_PTRDIFF_T_	int			/* ptr1 - ptr2 */
 #define	_BSD_RUNE_T_	_BSD_CT_RUNE_T_		/* rune_t (see below) */
diff --git a/sys/ia64/include/ansi.h b/sys/ia64/include/ansi.h
index 3f8fcd76b5a1..3c5f63207b3f 100644
--- a/sys/ia64/include/ansi.h
+++ b/sys/ia64/include/ansi.h
@@ -49,8 +49,6 @@
  */
 #define	_BSD_CLOCK_T_	int			/* clock() */
 #define	_BSD_CLOCKID_T_	int			/* clockid_t */
-#define	_BSD_IN_ADDR_T_	__uint32_t		/* inet(3) functions */
-#define	_BSD_IN_PORT_T_	__uint16_t
 #define	_BSD_MBSTATE_T_	__mbstate_t		/* mbstate_t */
 #define	_BSD_PTRDIFF_T_	long			/* ptr1 - ptr2 */
 #define	_BSD_RUNE_T_	_BSD_CT_RUNE_T_		/* rune_t (see below) */
diff --git a/sys/netinet/in.h b/sys/netinet/in.h
index 9ea89cd44862..cf72e57a6e98 100644
--- a/sys/netinet/in.h
+++ b/sys/netinet/in.h
@@ -228,12 +228,27 @@
  */
 #define IPPORT_RESERVEDSTART	600
 
+#define	IPPORT_MAX		65535
+
+#ifndef _IN_ADDR_T_DECLARED_
+typedef	__uint32_t	in_addr_t;
+#define	_IN_ADDR_T_DECLARED_
+#endif
+
+#ifndef _IN_PORT_T_DECLARED_
+typedef	__uint16_t	in_port_t;
+#define	_IN_PORT_T_DECLARED_
+#endif
+
 /*
  * Internet address (a structure for historical reasons)
  */
+#ifndef	_STRUCT_IN_ADDR_DECLARED
 struct in_addr {
 	in_addr_t s_addr;
 };
+#define	_STRUCT_IN_ADDR_DECLARED
+#endif
 
 /*
  * Definitions of bits in internet address integers.
diff --git a/sys/powerpc/include/ansi.h b/sys/powerpc/include/ansi.h
index 0279ee748abc..017d5fdd81fd 100644
--- a/sys/powerpc/include/ansi.h
+++ b/sys/powerpc/include/ansi.h
@@ -48,8 +48,6 @@
  */
 #define	_BSD_CLOCK_T_	int			/* clock() */
 #define	_BSD_CLOCKID_T_	int			/* clockid_t */
-#define	_BSD_IN_ADDR_T_	__uint32_t		/* inet(3) functions */
-#define	_BSD_IN_PORT_T_	__uint16_t
 #define	_BSD_MBSTATE_T_	__mbstate_t		/* mbstate_t */
 #define	_BSD_PTRDIFF_T_	int			/* ptr1 - ptr2 */
 #define	_BSD_RUNE_T_	_BSD_CT_RUNE_T_		/* rune_t (see below) */
diff --git a/sys/sparc64/include/ansi.h b/sys/sparc64/include/ansi.h
index df04532c2c0a..49e76c3c2877 100644
--- a/sys/sparc64/include/ansi.h
+++ b/sys/sparc64/include/ansi.h
@@ -49,8 +49,6 @@
  */
 #define	_BSD_CLOCK_T_	int			/* clock() */
 #define	_BSD_CLOCKID_T_	int			/* clock_gettime()... */
-#define	_BSD_IN_ADDR_T_	__uint32_t		/* inet(3) functions */
-#define	_BSD_IN_PORT_T_	__uint16_t
 #define	_BSD_MBSTATE_T_	__mbstate_t		/* mbstate_t */
 #define	_BSD_PTRDIFF_T_	long			/* ptr1 - ptr2 */
 #define	_BSD_RUNE_T_	_BSD_CT_RUNE_T_		/* rune_t (see below) */
diff --git a/sys/sys/types.h b/sys/sys/types.h
index a0a49bf3a71c..0477a24c0a20 100644
--- a/sys/sys/types.h
+++ b/sys/sys/types.h
@@ -124,7 +124,7 @@ typedef	u_int32_t	dev_t;		/* device number */
 
 /*
  * XXX: Deprecated;
- * byteorder(3) functions now defined in <apra/inet.h>.
+ * byteorder(3) functions now defined in <arpa/inet.h>.
  */
 #include <machine/endian.h>
 
@@ -138,16 +138,16 @@ typedef	_BSD_CLOCKID_T_	clockid_t;
 #undef	_BSD_CLOCKID_T_
 #endif
 
-/* XXX: Deprecated; now defined in <apra/inet.h>. */
-#ifdef	_BSD_IN_ADDR_T_
-typedef	_BSD_IN_ADDR_T_	in_addr_t;
-#undef	_BSD_IN_ADDR_T_
+/* XXX: Deprecated; now defined in <arpa/inet.h>. */
+#ifndef _IN_ADDR_T_DECLARED_
+typedef	__uint32_t	in_addr_t;
+#define	_IN_ADDR_T_DECLARED_
 #endif
 
-/* XXX: Deprecated; now defined in <apra/inet.h>. */
-#ifdef	_BSD_IN_PORT_T_
-typedef	_BSD_IN_PORT_T_	in_port_t;
-#undef	_BSD_IN_PORT_T_
+/* XXX: Deprecated; now defined in <arpa/inet.h>. */
+#ifndef _IN_PORT_T_DECLARED_
+typedef	__uint16_t	in_port_t;
+#define	_IN_PORT_T_DECLARED_
 #endif
 
 #ifdef	_BSD_SIZE_T_