text: /*	$NetBSD: socket.h,v 1.65 2001/10/22 20:59:04 kleink Exp $	*/
  
  /*
   * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   * 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.
   * 3. Neither the name of the project 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 PROJECT 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 PROJECT 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.
   */
  
  /*
   * Copyright (c) 1982, 1985, 1986, 1988, 1993, 1994
   *	The Regents of the University of California.  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.
   * 3. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *	This product includes software developed by the University of
   *	California, Berkeley and its contributors.
   * 4. 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.
   *
   *	@(#)socket.h	8.6 (Berkeley) 5/3/95
   */
  
  #ifndef _SYS_SOCKET_H_
  #define	_SYS_SOCKET_H_
  
  /*
   * Definitions related to sockets: types, address families, options.
   */
  
  /*
   * Data types.
   */
  #include <sys/ansi.h>
  
  #ifndef sa_family_t
  typedef __sa_family_t	sa_family_t;
  #define sa_family_t	__sa_family_t
  #endif
  
  #ifndef socklen_t
  typedef __socklen_t	socklen_t;
  #define socklen_t	__socklen_t
  #endif
  
  #include <machine/ansi.h>
  
  #ifdef	_BSD_SIZE_T_
  typedef	_BSD_SIZE_T_	size_t;
  #undef	_BSD_SIZE_T_
  #endif
  
  #ifdef	_BSD_SSIZE_T_
  typedef	_BSD_SSIZE_T_	ssize_t;
  #undef	_BSD_SSIZE_T_
  #endif
  
  #include <sys/uio.h>
  
  /*
   * Socket types.
   */
  #define	SOCK_STREAM	1		/* stream socket */
  #define	SOCK_DGRAM	2		/* datagram socket */
  #define	SOCK_RAW	3		/* raw-protocol interface */
  #define	SOCK_RDM	4		/* reliably-delivered message */
  #define	SOCK_SEQPACKET	5		/* sequenced packet stream */
  
  /*
   * Option flags per-socket.
   */
  #define	SO_DEBUG	0x0001		/* turn on debugging info recording */
  #define	SO_ACCEPTCONN	0x0002		/* socket has had listen() */
  #define	SO_REUSEADDR	0x0004		/* allow local address reuse */
  #define	SO_KEEPALIVE	0x0008		/* keep connections alive */
  #define	SO_DONTROUTE	0x0010		/* just use interface addresses */
  #define	SO_BROADCAST	0x0020		/* permit sending of broadcast msgs */
  #define	SO_USELOOPBACK	0x0040		/* bypass hardware when possible */
  #define	SO_LINGER	0x0080		/* linger on close if data present */
  #define	SO_OOBINLINE	0x0100		/* leave received OOB data in line */
  #define	SO_REUSEPORT	0x0200		/* allow local address & port reuse */
  #define	SO_TIMESTAMP	0x0400		/* timestamp received dgram traffic */
  
  /*
   * Additional options, not kept in so_options.
   */
  #define SO_SNDBUF	0x1001		/* send buffer size */
  #define SO_RCVBUF	0x1002		/* receive buffer size */
  #define SO_SNDLOWAT	0x1003		/* send low-water mark */
  #define SO_RCVLOWAT	0x1004		/* receive low-water mark */
  #define SO_SNDTIMEO	0x1005		/* send timeout */
  #define SO_RCVTIMEO	0x1006		/* receive timeout */
  #define	SO_ERROR	0x1007		/* get error status and clear */
  #define	SO_TYPE		0x1008		/* get socket type */
  
  /*
   * Structure used for manipulating linger option.
   */
  struct	linger {
  	int	l_onoff;		/* option on/off */
  	int	l_linger;		/* linger time in seconds */
  };
  
  /*
   * Level number for (get/set)sockopt() to apply to socket itself.
   */
  #define	SOL_SOCKET	0xffff		/* options for socket level */
  
  /*
   * Address families.
   */
  #define	AF_UNSPEC	0		/* unspecified */
  #define	AF_LOCAL	1		/* local to host (pipes, portals) */
  #define	AF_UNIX		AF_LOCAL	/* backward compatibility */
  #define	AF_INET		2		/* internetwork: UDP, TCP, etc. */
  #define	AF_IMPLINK	3		/* arpanet imp addresses */
  #define	AF_PUP		4		/* pup protocols: e.g. BSP */
  #define	AF_CHAOS	5		/* mit CHAOS protocols */
  #define	AF_NS		6		/* XEROX NS protocols */
  #define	AF_ISO		7		/* ISO protocols */
  #define	AF_OSI		AF_ISO
  #define	AF_ECMA		8		/* european computer manufacturers */
  #define	AF_DATAKIT	9		/* datakit protocols */
  #define	AF_CCITT	10		/* CCITT protocols, X.25 etc */
  #define	AF_SNA		11		/* IBM SNA */
  #define AF_DECnet	12		/* DECnet */
  #define AF_DLI		13		/* DEC Direct data link interface */
  #define AF_LAT		14		/* LAT */
  #define	AF_HYLINK	15		/* NSC Hyperchannel */
  #define	AF_APPLETALK	16		/* Apple Talk */
  #define	AF_ROUTE	17		/* Internal Routing Protocol */
  #define	AF_LINK		18		/* Link layer interface */
  #if !defined(_XOPEN_SOURCE)
  #define	pseudo_AF_XTP	19		/* eXpress Transfer Protocol (no AF) */
  #endif
  #define	AF_COIP		20		/* connection-oriented IP, aka ST II */
  #define	AF_CNT		21		/* Computer Network Technology */
  #if !defined(_XOPEN_SOURCE)
  #define pseudo_AF_RTIP	22		/* Help Identify RTIP packets */
  #endif
  #define	AF_IPX		23		/* Novell Internet Protocol */
  #define	AF_INET6	24		/* IP version 6 */
  #if !defined(_XOPEN_SOURCE)
  #define pseudo_AF_PIP	25		/* Help Identify PIP packets */
  #endif
  #define AF_ISDN		26		/* Integrated Services Digital Network*/
  #define AF_E164		AF_ISDN		/* CCITT E.164 recommendation */
  #define AF_NATM		27		/* native ATM access */
  #define AF_ARP		28		/* (rev.) addr. res. prot. (RFC 826) */
  #if !defined(_XOPEN_SOURCE)
  #define pseudo_AF_KEY	29		/* Internal key management protocol  */
  #define	pseudo_AF_HDRCMPLT 30		/* Used by BPF to not rewrite hdrs
  					   in interface output routine */
  #define pseudo_AF_MOBILITY 31
  #endif
  
  #define	AF_MAX		32
  
  /*
   * Structure used by kernel to store most
   * addresses.
   */
  struct sockaddr {
  	__uint8_t	sa_len;		/* total length */
  	sa_family_t	sa_family;	/* address family */
  	char		sa_data[14];	/* actually longer; address value */
  };
  
  #if defined(_KERNEL)
  /*
   * Structure used by kernel to pass protocol
   * information in raw sockets.
   */
  struct sockproto {
  	u_short	sp_family;		/* address family */
  	u_short	sp_protocol;		/* protocol */
  };
  #endif /* _KERNEL */
  
  #if 1
  /*
   * RFC 2553: protocol-independent placeholder for socket addresses
   */
  #define _SS_MAXSIZE	128
  #define _SS_ALIGNSIZE	(sizeof(__int64_t))
  #define _SS_PAD1SIZE	(_SS_ALIGNSIZE - 2)
  #define _SS_PAD2SIZE	(_SS_MAXSIZE - 2 - \
  				_SS_PAD1SIZE - _SS_ALIGNSIZE)
  
  #if !defined(_XOPEN_SOURCE) || (_XOPEN_SOURCE - 0) >= 500
  struct sockaddr_storage {
  	__uint8_t	ss_len;		/* address length */
  	sa_family_t	ss_family;	/* address family */
  	char		__ss_pad1[_SS_PAD1SIZE];
  	__int64_t     __ss_align;/* force desired structure storage alignment */
  	char		__ss_pad2[_SS_PAD2SIZE];
  };
  #endif /* !_XOPEN_SOURCE || ... */
  #endif /* 1 */
  
  /*
   * Protocol families, same as address families for now.
   */
  #define	PF_UNSPEC	AF_UNSPEC
  #define	PF_LOCAL	AF_LOCAL
  #define	PF_UNIX		PF_LOCAL	/* backward compatibility */
  #define	PF_INET		AF_INET
  #define	PF_IMPLINK	AF_IMPLINK
  #define	PF_PUP		AF_PUP
  #define	PF_CHAOS	AF_CHAOS
  #define	PF_NS		AF_NS
  #define	PF_ISO		AF_ISO
  #define	PF_OSI		AF_ISO
  #define	PF_ECMA		AF_ECMA
  #define	PF_DATAKIT	AF_DATAKIT
  #define	PF_CCITT	AF_CCITT
  #define	PF_SNA		AF_SNA
  #define PF_DECnet	AF_DECnet
  #define PF_DLI		AF_DLI
  #define PF_LAT		AF_LAT
  #define	PF_HYLINK	AF_HYLINK
  #define	PF_APPLETALK	AF_APPLETALK
  #define	PF_ROUTE	AF_ROUTE
  #define	PF_LINK		AF_LINK
  #if !defined(_XOPEN_SOURCE)
  #define	PF_XTP		pseudo_AF_XTP	/* really just proto family, no AF */
  #endif
  #define	PF_COIP		AF_COIP
  #define	PF_CNT		AF_CNT
  #define	PF_INET6	AF_INET6
  #define	PF_IPX		AF_IPX		/* same format as AF_NS */
  #if !defined(_XOPEN_SOURCE)
  #define PF_RTIP		pseudo_AF_FTIP	/* same format as AF_INET */
  #define PF_PIP		pseudo_AF_PIP
  #endif
  #define PF_ISDN		AF_ISDN		/* same as E164 */
  #define PF_E164		AF_E164
  #define PF_NATM		AF_NATM
  #define PF_ARP		AF_ARP
  #if !defined(_XOPEN_SOURCE)
  #define PF_KEY 		pseudo_AF_KEY	/* like PF_ROUTE, only for key mgmt */
  #endif
  #define PF_MOBILITY	pseudo_AF_MOBILITY
  
  #define	PF_MAX		AF_MAX
  
  #if !defined(_XOPEN_SOURCE)
  
  #ifndef	gid_t
  typedef	__gid_t		gid_t;		/* group id */
  #define	gid_t		__gid_t
  #endif
  
  #ifndef	uid_t
  typedef	__uid_t		uid_t;		/* user id */
  #define	uid_t		__uid_t
  #endif
  
  /*
   * Socket credentials.
   */
  struct sockcred {
  	uid_t	sc_uid;			/* real user id */
  	uid_t	sc_euid;		/* effective user id */
  	gid_t	sc_gid;			/* real group id */
  	gid_t	sc_egid;		/* effective group id */
  	int	sc_ngroups;		/* number of supplemental groups */
  	gid_t	sc_groups[1];		/* variable length */
  };
  
  /*
   * Compute size of a sockcred structure with groups.
   */
  #define	SOCKCREDSIZE(ngrps) \
  	(sizeof(struct sockcred) + (sizeof(gid_t) * ((ngrps) - 1)))
  #endif /* !_XOPEN_SOURCE */
  
  
  #if !defined(_XOPEN_SOURCE)
  /*
   * Definitions for network related sysctl, CTL_NET.
   *
   * Second level is protocol family.
   * Third level is protocol number.
   *
   * Further levels are defined by the individual families below.
   */
  #define NET_MAXID	AF_MAX
  
  #define CTL_NET_NAMES { \
  	{ 0, 0 }, \
  	{ "local", CTLTYPE_NODE }, \
  	{ "inet", CTLTYPE_NODE }, \
  	{ "implink", CTLTYPE_NODE }, \
  	{ "pup", CTLTYPE_NODE }, \
  	{ "chaos", CTLTYPE_NODE }, \
  	{ "xerox_ns", CTLTYPE_NODE }, \
  	{ "iso", CTLTYPE_NODE }, \
  	{ "emca", CTLTYPE_NODE }, \
  	{ "datakit", CTLTYPE_NODE }, \
  	{ "ccitt", CTLTYPE_NODE }, \
  	{ "ibm_sna", CTLTYPE_NODE }, \
  	{ "decnet", CTLTYPE_NODE }, \
  	{ "dec_dli", CTLTYPE_NODE }, \
  	{ "lat", CTLTYPE_NODE }, \
  	{ "hylink", CTLTYPE_NODE }, \
  	{ "appletalk", CTLTYPE_NODE }, \
  	{ "route", CTLTYPE_NODE }, \
  	{ "link_layer", CTLTYPE_NODE }, \
  	{ "xtp", CTLTYPE_NODE }, \
  	{ "coip", CTLTYPE_NODE }, \
  	{ "cnt", CTLTYPE_NODE }, \
  	{ "rtip", CTLTYPE_NODE }, \
  	{ "ipx", CTLTYPE_NODE }, \
  	{ "inet6", CTLTYPE_NODE }, \
  	{ "pip", CTLTYPE_NODE }, \
  	{ "isdn", CTLTYPE_NODE }, \
  	{ "natm", CTLTYPE_NODE }, \
  	{ "arp", CTLTYPE_NODE }, \
  	{ "key", CTLTYPE_NODE }, \
  }
  #endif /* !_XOPEN_SOURCE */
  
  #if !defined(_XOPEN_SOURCE)
  /*
   * PF_ROUTE - Routing table
   *
   * Three additional levels are defined:
   *	Fourth: address family, 0 is wildcard
   *	Fifth: type of info, defined below
   *	Sixth: flag(s) to mask with for NET_RT_FLAGS
   */
  #define NET_RT_DUMP	1		/* dump; may limit to a.f. */
  #define NET_RT_FLAGS	2		/* by flags, e.g. RESOLVING */
  #define NET_RT_OIFLIST	3		/* old NET_RT_IFLIST (pre 1.5) */
  #define NET_RT_IFLIST	4		/* survey interface list */
  #define	NET_RT_MAXID	5
  
  #define CTL_NET_RT_NAMES { \
  	{ 0, 0 }, \
  	{ "dump", CTLTYPE_STRUCT }, \
  	{ "flags", CTLTYPE_STRUCT }, \
  	{ 0, 0 }, \
  	{ "iflist", CTLTYPE_STRUCT }, \
  }
  #endif /* !_XOPEN_SOURCE */
  
  /*
   * Maximum queue length specifiable by listen(2).
   */
  
  #define	SOMAXCONN	128
  
  /*
   * Message header for recvmsg and sendmsg calls.
   * Used value-result for recvmsg, value only for sendmsg.
   */
  struct msghdr {
  	void		*msg_name;	/* optional address */
  	socklen_t	msg_namelen;	/* size of address */
  	struct iovec	*msg_iov;	/* scatter/gather array */
  	int		msg_iovlen;	/* # elements in msg_iov */
  	void		*msg_control;	/* ancillary data, see below */
  	socklen_t	msg_controllen;	/* ancillary data buffer len */
  	int		msg_flags;	/* flags on received message */
  };
  
  #define	MSG_OOB		0x1		/* process out-of-band data */
  #define	MSG_PEEK	0x2		/* peek at incoming message */
  #define	MSG_DONTROUTE	0x4		/* send without using routing tables */
  #define	MSG_EOR		0x8		/* data completes record */
  #define	MSG_TRUNC	0x10		/* data discarded before delivery */
  #define	MSG_CTRUNC	0x20		/* control data lost before delivery */
  #define	MSG_WAITALL	0x40		/* wait for full request or error */
  #define	MSG_DONTWAIT	0x80		/* this message should be nonblocking */
  #define	MSG_BCAST	0x100		/* this message was rcvd using link-level brdcst */
  #define	MSG_MCAST	0x200		/* this message was rcvd using link-level mcast */
  #define	MSG_NOTIFICATION 0x400		/* This message is a notification */
  
  /*
   * Header for ancillary data objects in msg_control buffer.
   * Used for additional information with/about a datagram
   * not expressible by flags.  The format is a sequence
   * of message elements headed by cmsghdr structures.
   */
  struct cmsghdr {
  	socklen_t	cmsg_len;	/* data byte count, including hdr */
  	int		cmsg_level;	/* originating protocol */
  	int		cmsg_type;	/* protocol-specific type */
  /* followed by	u_char  cmsg_data[]; */
  };
  
  /* given pointer to struct cmsghdr, return pointer to data */
  #define	CMSG_DATA(cmsg) \
  	((u_char *)(void *)(cmsg) + __CMSG_ALIGN(sizeof(struct cmsghdr)))
  
  /*
   * Alignment requirement for CMSG struct manipulation.
   * This basically behaves the same as ALIGN() ARCH/include/param.h.
   * We declare it separately for two reasons:
   * (1) avoid dependency between machine/param.h, and (2) to sync with kernel's
   * idea of ALIGNBYTES at runtime.
   * without (2), we can't guarantee binary compatibility in case of future
   * changes in ALIGNBYTES.
   */
  #define __CMSG_ALIGN(n)	(((n) + __cmsg_alignbytes()) & ~__cmsg_alignbytes())
  #ifdef _KERNEL
  #define CMSG_ALIGN(n)	__CMSG_ALIGN(n)
  #endif
  
  /* given pointer to struct cmsghdr, return pointer to next cmsghdr */
  #define	CMSG_NXTHDR(mhdr, cmsg)	\
  	(((__caddr_t)(cmsg) + __CMSG_ALIGN((cmsg)->cmsg_len) + \
  			    __CMSG_ALIGN(sizeof(struct cmsghdr)) > \
  	    (((__caddr_t)(mhdr)->msg_control) + (mhdr)->msg_controllen)) ? \
  	    (struct cmsghdr *)NULL : \
  	    (struct cmsghdr *)((__caddr_t)(cmsg) + \
  	        __CMSG_ALIGN((cmsg)->cmsg_len)))
  
  /*
   * RFC 2292 requires to check msg_controllen, in case that the kernel returns
   * an empty list for some reasons.
   */
  #define	CMSG_FIRSTHDR(mhdr) \
  	((mhdr)->msg_controllen >= sizeof(struct cmsghdr) ? \
  	 (struct cmsghdr *)(mhdr)->msg_control : \
  	 (struct cmsghdr *)NULL)
  
  #define CMSG_SPACE(l)	(__CMSG_ALIGN(sizeof(struct cmsghdr)) + __CMSG_ALIGN(l))
  #define CMSG_LEN(l)	(__CMSG_ALIGN(sizeof(struct cmsghdr)) + (l))
  
  /* "Socket"-level control message types: */
  #define	SCM_RIGHTS	0x01		/* access rights (array of int) */
  #if !defined(_XOPEN_SOURCE)
  #define	SCM_TIMESTAMP	0x02		/* timestamp (struct timeval) */
  #define	SCM_CREDS	0x04		/* credentials (struct sockcred) */
  #endif
  
  /*
   * Types of socket shutdown(2).
   */
  #define	SHUT_RD		0		/* Disallow further receives. */
  #define	SHUT_WR		1		/* Disallow further sends. */
  #define	SHUT_RDWR	2		/* Disallow further sends/receives. */
  
  #if !defined(_XOPEN_SOURCE)
  /*
   * 4.3 compat sockaddr, move to compat file later
   */
  struct osockaddr {
  	__uint16_t	sa_family;	/* address family */
  	char		sa_data[14];	/* up to 14 bytes of direct address */
  };
  
  /*
   * 4.3-compat message header (move to compat file later).
   */
  struct omsghdr {
  	__caddr_t	msg_name;	/* optional address */
  	int		msg_namelen;	/* size of address */
  	struct iovec	*msg_iov;	/* scatter/gather array */
  	int		msg_iovlen;	/* # elements in msg_iov */
  	__caddr_t	msg_accrights;	/* access rights sent/received */
  	int		msg_accrightslen;
  };
  #endif
  
  #include <sys/cdefs.h>
  
  __BEGIN_DECLS
  int	__cmsg_alignbytes __P((void));
  __END_DECLS
  
  #ifndef	_KERNEL
  
  __BEGIN_DECLS
  int	accept __P((int, struct sockaddr * __restrict, socklen_t * __restrict));
  int	bind __P((int, const struct sockaddr *, socklen_t));
  int	connect __P((int, const struct sockaddr *, socklen_t));
  int	getpeername __P((int, struct sockaddr * __restrict,
  	    socklen_t * __restrict));
  int	getsockname __P((int, struct sockaddr * __restrict,
  	    socklen_t * __restrict));
  int	getsockopt __P((int, int, int, void * __restrict,
  	    socklen_t * __restrict));
  int	listen __P((int, int));
  ssize_t	recv __P((int, void *, size_t, int));
  ssize_t	recvfrom __P((int, void * __restrict, size_t, int,
  	    struct sockaddr * __restrict, socklen_t * __restrict));
  ssize_t	recvmsg __P((int, struct msghdr *, int));
  ssize_t	send __P((int, const void *, size_t, int));
  ssize_t	sendto __P((int, const void *,
  	    size_t, int, const struct sockaddr *, socklen_t));
  ssize_t	sendmsg __P((int, const struct msghdr *, int));
  int	setsockopt __P((int, int, int, const void *, socklen_t));
  int	shutdown __P((int, int));
  int	sockatmark __P((int));
  int	socket __P((int, int, int));
  int	socketpair __P((int, int, int, int *));
  __END_DECLS
  #endif /* !_KERNEL */
  
  #endif /* !_SYS_SOCKET_H_ */
  