// © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.

 /*-

  * Copyright (c) 1982, 1985, 1986, 1988, 1993, 1994

  *	The Regents of the University of California.  All rights reserved.

  * © Portions copyright (c) 2007 Symbian Software Ltd. 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.

  * 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	8.4 (Berkeley) 2/21/94

  * $FreeBSD: src/sys/sys/socket.h,v 1.88.2.1 2005/09/27 21:14:10 rwatson Exp $

  */

 #ifndef _SYS_SOCKET_H_

 #define	_SYS_SOCKET_H_

 #include <sys/cdefs.h>

 #include <sys/types.h>

 #include <sys/_types.h>

 #include <sys/_iovec.h>

 #define _NO_NAMESPACE_POLLUTION

 #include <machine/param.h>

 #undef _NO_NAMESPACE_POLLUTION

 /*

  * Definitions related to sockets: types, address families, options.

  */

 /*

  * Data types.

  */

 #if __BSD_VISIBLE

 #ifndef _GID_T_DECLARED

 typedef	__gid_t		gid_t;

 #define	_GID_T_DECLARED

 #endif

 #ifndef _OFF_T_DECLARED

 typedef	__off_t		off_t;

 #define	_OFF_T_DECLARED

 #endif

 #ifndef _PID_T_DECLARED

 typedef	__pid_t		pid_t;

 #define	_PID_T_DECLARED

 #endif

 #endif

 #ifndef _SA_FAMILY_T_DECLARED

 typedef	__sa_family_t	sa_family_t;

 #define	_SA_FAMILY_T_DECLARED

 #endif

 #ifndef _SOCKLEN_T_DECLARED

 typedef	__socklen_t	socklen_t;

 #define	_SOCKLEN_T_DECLARED

 #endif

 #ifndef _SSIZE_T_DECLARED

 typedef	__ssize_t	ssize_t;

 #define	_SSIZE_T_DECLARED

 #endif

 #if __BSD_VISIBLE 

 #ifndef _UID_T_DECLARED

 typedef	__uid_t		uid_t;

 #define	_UID_T_DECLARED

 #endif

 #endif

 /*

  * Types

  */

 #define	SOCK_STREAM	1		/* stream socket */

 #define	SOCK_DGRAM	2		/* datagram socket */

 #ifdef __SYMBIAN32__

 #define	SOCK_RAW	4		/* raw-protocol interface */

 #else

 #define	SOCK_RAW	3		/* raw-protocol interface */

 #endif	// __SYMBIAN32__

 #if __BSD_VISIBLE

 #define	SOCK_RDM	4		/* reliably-delivered message */

 #endif

 #ifdef __SYMBIAN32__

 #define	SOCK_SEQPACKET	3		/* sequenced packet stream */

 #else

 #define	SOCK_SEQPACKET	5		/* sequenced packet stream */

 #endif	// __SYMBIAN32__

 /*

  * Option flags per-socket.

  */

 #define	SO_DEBUG	0x0001		/* turn on debugging info recording KSODebug */

 #define	SO_ACCEPTCONN	0x0002		/* socket has had listen() */

 #ifdef __SYMBIAN32__

 #define	SO_REUSEADDR	0x406		/* allow local address reuse */

 #else

 #define	SO_REUSEADDR	0x0004		/* allow local address reuse */

 #endif	// __SYMBIAN32__

 #ifdef __SYMBIAN32__

 #define	SO_KEEPALIVE	0x305		/* keep connections alive KSoTcpKeepAlive */

 #else

 #define	SO_KEEPALIVE	0x0008		/* keep connections alive */

 #endif	// __SYMBIAN32__

 #define	SO_DONTROUTE	0x0010		/* just use interface addresses */

 #ifdef __SYMBIAN32__

 #define	SO_BROADCAST	-1			/* permit sending of broadcast msgs */

 #else

 #define	SO_BROADCAST	0x0020		/* permit sending of broadcast msgs */

 #endif	// __SYMBIAN32__

 #if __BSD_VISIBLE

 #ifdef __SYMBIAN32__

 #define	SO_USELOOPBACK	-2 		/* bypass hardware when possible */

 #else

 #define	SO_USELOOPBACK	0x0040		/* bypass hardware when possible */

 #endif	// __SYMBIAN32__

 #endif

 #ifdef __SYMBIAN32__

 #define	SO_LINGER	-3			/* linger on close if data present */

 #else

 #define	SO_LINGER	0x0080		/* linger on close if data present */

 #endif	// __SYMBIAN32__

 #ifdef __SYMBIAN32__

 #define	SO_OOBINLINE	0x315		/* leave received OOB data in line KSoTcpOobInline */

 #else

 #define	SO_OOBINLINE	0x0100		/* leave received OOB data in line */

 #endif	// __SYMBIAN32__

 #if __BSD_VISIBLE

 #define	SO_REUSEPORT	0x0200		/* allow local address & port reuse */

 #define	SO_TIMESTAMP	0x0400		/* timestamp received dgram traffic */

 #define	SO_NOSIGPIPE	0x0800		/* no SIGPIPE from EPIPE */

 #define	SO_ACCEPTFILTER	0x1000		/* there is an accept filter */

 #define	SO_BINTIME	0x2000		/* timestamp received dgram traffic */

 #endif

 /*

  * Additional options, not kept in so_options.

  */

 #ifdef __SYMBIAN32__

 #define	SO_SNDBUF	3			/* send buffer size KSOSendBuf */

 #else

 #define	SO_SNDBUF	0x1001		/* send buffer size */

 #endif	// __SYMBIAN32__

 #ifdef __SYMBIAN32__

 #define	SO_RCVBUF	2			/* receive buffer size KSORecvBuf */

 #else

 #define	SO_RCVBUF	0x1002		/* receive buffer size */

 #endif	// __SYMBIAN32__

 #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 */

 #ifdef __SYMBIAN32__

 #define	SO_ERROR	9		/* get error status and clear */

 #else

 #define	SO_ERROR	0x1007		/* get error status and clear */

 #endif	// __SYMBIAN32__

 #define	SO_TYPE		0x1008		/* get socket type */

 #if __BSD_VISIBLE

 #define	SO_LABEL	0x1009		/* socket's MAC label */

 #define	SO_PEERLABEL	0x1010		/* socket's peer's MAC label */

 #define	SO_LISTENQLIMIT	0x1011		/* socket's backlog limit */

 #define	SO_LISTENQLEN	0x1012		/* socket's complete queue length */

 #define	SO_LISTENINCQLEN	0x1013	/* socket's incomplete queue length */

 #endif

 /*

  * Structure used for manipulating linger option.

  */

 struct linger {

 	int	l_onoff;		/* option on/off */

 	int	l_linger;		/* linger time */

 };

 #if __BSD_VISIBLE

 struct accept_filter_arg {

 	char	af_name[16];

 	char	af_arg[256-16];

 };

 #endif

 /*

  * Level number for (get/set)sockopt() to apply to socket itself.

  */

 #ifdef __SYMBIAN32__

 #define	SOL_SOCKET	1			/* options for socket level KSOLSocket */

 #else

 #define	SOL_SOCKET	0xffff		/* options for socket level */

 #endif	// __SYMBIAN32__

 /*

  * Address families.

  */

 #define	AF_UNSPEC	0		/* unspecified */

 #if __BSD_VISIBLE

 #ifdef __SYMBIAN32__

 #define	AF_LOCAL	0x666		/* local to host (pipes, portals) */

 #else

 #define	AF_LOCAL	AF_UNIX		/* local to host (pipes, portals) */

 #endif	// __SYMBIAN32__

 #endif

 #define	AF_UNIX		1		/* standardized name for AF_LOCAL */

 #ifdef __SYMBIAN32__

 #define	AF_INET		0x0800		/* internetwork: UDP, TCP, etc. */

 #else

 #define	AF_INET		2		/* internetwork: UDP, TCP, etc. */

 #endif	// __SYMBIAN32__

 #if __BSD_VISIBLE

 #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_NETBIOS	6		/* SMB 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 */

 #define	pseudo_AF_XTP	19		/* eXpress Transfer Protocol (no AF) */

 #define	AF_COIP		20		/* connection-oriented IP, aka ST II */

 #define	AF_CNT		21		/* Computer Network Technology */

 #define pseudo_AF_RTIP	22		/* Help Identify RTIP packets */

 #define	AF_IPX		23		/* Novell Internet Protocol */

 #define	AF_SIP		24		/* Simple Internet Protocol */

 #define	pseudo_AF_PIP	25		/* Help Identify PIP packets */

 #define	AF_ISDN		26		/* Integrated Services Digital Network*/

 #define	AF_E164		AF_ISDN		/* CCITT E.164 recommendation */

 #define	pseudo_AF_KEY	27		/* Internal key-management function */

 #endif

 #ifdef __SYMBIAN32__

 #define	AF_INET6	0x0806		/* IPv6 */

 #else

 #define	AF_INET6	28		/* IPv6 */

 #endif

 #if __BSD_VISIBLE

 #define	AF_NATM		29		/* native ATM access */

 #define	AF_ATM		30		/* ATM */

 #define pseudo_AF_HDRCMPLT 31		/* Used by BPF to not rewrite headers

 					 * in interface output routine

 					 */

 #define	AF_NETGRAPH	32		/* Netgraph sockets */

 #define	AF_SLOW		33		/* 802.3ad slow protocol */

 #define	AF_SCLUSTER	34		/* Sitara cluster protocol */

 #define	AF_ARP		35

 #define	AF_BLUETOOTH	36		/* Bluetooth sockets */

 #define	AF_MAX		37

 #endif

 #ifdef __SYMBIAN32__

 #define	AF_IRDA		0x0100		/* IrDA */

 #define AF_PLP		273		/* Symbian link protocol */

 #endif	// __SYMBIAN32__

 #ifndef __SYMBIAN32__

 /*

  * Structure used by kernel to store most

  * addresses.

  */

 struct sockaddr {

 	unsigned char	sa_len;		/* total length */

 	sa_family_t	sa_family;	/* address family */

 	char		sa_data[14];	/* actually longer; address value */

 };

 #else 

 /**

 Structure used by EPOC32 to store most addresses.

 NB. EPOC32 uses 32-bit family and port numbers internally, but they have been

 left as shorts here for compatibility with code that uses htons()/ntohs() explicitly.

 */

 struct sockaddr {

 	u_short	sa_family;		/* address family */

 	u_short sa_port;		/* port number - a common feature of most protocols */

 	char	sa_data[24];		/* up to 24 bytes of direct address */

       unsigned char	sa_len;	

 };

 #endif //__SYMBIAN32__

 #if __BSD_VISIBLE

 #define	SOCK_MAXADDRLEN	255		/* longest possible addresses */

 /*

  * Structure used by kernel to pass protocol

  * information in raw sockets.

  */

 struct sockproto {

 	unsigned short	sp_family;		/* address family */

 	unsigned short	sp_protocol;		/* protocol */

 };

 #endif

 /*

  * RFC 2553: protocol-independent placeholder for socket addresses

  */

 #define	_SS_MAXSIZE	128U

 #define	_SS_ALIGNSIZE	(sizeof(__int64_t))

 #define	_SS_PAD1SIZE	(_SS_ALIGNSIZE - sizeof(unsigned char) - \

 			    sizeof(sa_family_t))

 #define	_SS_PAD2SIZE	(_SS_MAXSIZE - sizeof(unsigned char) - \

 			    sizeof(sa_family_t) - _SS_PAD1SIZE - _SS_ALIGNSIZE)

 struct sockaddr_storage {

 	unsigned char	ss_len;		/* address length */

 	sa_family_t	ss_family;	/* address family */

 	char		__ss_pad1[_SS_PAD1SIZE];

 	__int64_t	__ss_align;	/* force desired struct alignment */

 	char		__ss_pad2[_SS_PAD2SIZE];

 };

 #if __BSD_VISIBLE

 /*

  * 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_NETBIOS	AF_NETBIOS

 #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

 #define	PF_XTP		pseudo_AF_XTP	/* really just proto family, no AF */

 #define	PF_COIP		AF_COIP

 #define	PF_CNT		AF_CNT

 #define	PF_SIP		AF_SIP

 #define	PF_IPX		AF_IPX

 #define PF_RTIP		pseudo_AF_RTIP	/* same format as AF_INET */

 #define PF_PIP		pseudo_AF_PIP

 #define	PF_ISDN		AF_ISDN

 #define	PF_KEY		pseudo_AF_KEY

 #define	PF_INET6	AF_INET6

 #define	PF_NATM		AF_NATM

 #define	PF_ATM		AF_ATM

 #define	PF_NETGRAPH	AF_NETGRAPH

 #define	PF_SLOW		AF_SLOW

 #define PF_SCLUSTER	AF_SCLUSTER

 #define	PF_ARP		AF_ARP

 #define	PF_BLUETOOTH	AF_BLUETOOTH

 #define	PF_MAX		AF_MAX

 #ifdef __SYMBIAN32__

 #define	PF_IRDA		AF_IRDA

 #define PF_PLP		AF_PLP

 #endif	// __SYMBIAN32__

 /*

  * 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 }, \

 	{ "unix", 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 }, \

 	{ "sip", CTLTYPE_NODE }, \

 	{ "pip", CTLTYPE_NODE }, \

 	{ "isdn", CTLTYPE_NODE }, \

 	{ "key", CTLTYPE_NODE }, \

 	{ "inet6", CTLTYPE_NODE }, \

 	{ "natm", CTLTYPE_NODE }, \

 	{ "atm", CTLTYPE_NODE }, \

 	{ "hdrcomplete", CTLTYPE_NODE }, \

 	{ "netgraph", CTLTYPE_NODE }, \

 	{ "snp", CTLTYPE_NODE }, \

 	{ "scp", CTLTYPE_NODE }, \

 }

 /*

  * 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_IFLIST	3		/* survey interface list */

 #define	NET_RT_IFMALIST	4		/* return multicast address list */

 #define	NET_RT_MAXID	5

 #define CTL_NET_RT_NAMES { \

 	{ 0, 0 }, \

 	{ "dump", CTLTYPE_STRUCT }, \

 	{ "flags", CTLTYPE_STRUCT }, \

 	{ "iflist", CTLTYPE_STRUCT }, \

 	{ "ifmalist", CTLTYPE_STRUCT }, \

 }

 #endif /* __BSD_VISIBLE */

 /*

  * Maximum queue length specifiable by listen.

  */

 #ifdef __SYMBIAN32__

 #define	SOMAXCONN	5

 #else

 #define	SOMAXCONN	128

 #endif	// __SYMBIAN32__

 /*

  * 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 */

 #if __BSD_VISIBLE

 #define	MSG_DONTWAIT	0x80		/* this message should be nonblocking */

 #define	MSG_EOF		0x100		/* data completes connection */

 #define	MSG_NBIO	0x4000		/* FIONBIO mode, used by fifofs */

 #define	MSG_COMPAT      0x8000		/* used in sendit() */

 #endif

 #ifdef _KERNEL

 #define	MSG_SOCALLBCK   0x10000		/* for use by socket callbacks - soreceive (TCP) */

 #endif

 #if __BSD_VISIBLE

 #define	MSG_NOSIGNAL	0x20000		/* do not generate SIGPIPE on EOF */

 #endif

 /*

  * 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[]; */

 };

 #if __BSD_VISIBLE

 /*

  * While we may have more groups than this, the cmsgcred struct must

  * be able to fit in an mbuf, and NGROUPS_MAX is too large to allow

  * this.

 */

 #define CMGROUP_MAX 16

 /*

  * Credentials structure, used to verify the identity of a peer

  * process that has sent us a message. This is allocated by the

  * peer process but filled in by the kernel. This prevents the

  * peer from lying about its identity. (Note that cmcred_groups[0]

  * is the effective GID.)

  */

 struct cmsgcred {

 	pid_t	cmcred_pid;		/* PID of sending process */

 	uid_t	cmcred_uid;		/* real UID of sending process */

 	uid_t	cmcred_euid;		/* effective UID of sending process */

 	gid_t	cmcred_gid;		/* real GID of sending process */

 	short	cmcred_ngroups;		/* number or groups */

 	gid_t	cmcred_groups[CMGROUP_MAX];	/* groups */

 };

 /*

  * 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 /* __BSD_VISIBLE */

 /* given pointer to struct cmsghdr, return pointer to data */

 #define	CMSG_DATA(cmsg)		((unsigned char *)(cmsg) + \

 				 _ALIGN(sizeof(struct cmsghdr)))

 /* given pointer to struct cmsghdr, return pointer to next cmsghdr */

 #define	CMSG_NXTHDR(mhdr, cmsg)	\

 	(((char *)(cmsg) + _ALIGN((cmsg)->cmsg_len) + \

 	  _ALIGN(sizeof(struct cmsghdr)) > \

 	    (char *)(mhdr)->msg_control + (mhdr)->msg_controllen) ? \

 	    (struct cmsghdr *)0 : \

 	    (struct cmsghdr *)((char *)(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)

 #if __BSD_VISIBLE

 /* RFC 2292 additions */

 #define	CMSG_SPACE(l)		(_ALIGN(sizeof(struct cmsghdr)) + _ALIGN(l))

 #define	CMSG_LEN(l)		(_ALIGN(sizeof(struct cmsghdr)) + (l))

 #endif

 #ifdef _KERNEL

 #define	CMSG_ALIGN(n)	_ALIGN(n)

 #endif

 /* "Socket"-level control message types: */

 #define	SCM_RIGHTS	0x01		/* access rights (array of int) */

 #if __BSD_VISIBLE

 #define	SCM_TIMESTAMP	0x02		/* timestamp (struct timeval) */

 #define	SCM_CREDS	0x03		/* process creds (struct cmsgcred) */

 #define	SCM_BINTIME	0x04		/* timestamp (struct bintime) */

 #endif

 #if __BSD_VISIBLE

 /*

  * 4.3 compat sockaddr, move to compat file later

  */

 struct osockaddr {

 	unsigned short 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 {

 	char	*msg_name;		/* optional address */

 	int	msg_namelen;		/* size of address */

 	struct	iovec *msg_iov;		/* scatter/gather array */

 	int	msg_iovlen;		/* # elements in msg_iov */

 	char	*msg_accrights;		/* access rights sent/received */

 	int	msg_accrightslen;

 };

 #endif

 /*

  * howto arguments for shutdown(2), specified by Posix.1g.

  */

 #define	SHUT_RD		0		/* shut down the reading side */

 #define	SHUT_WR		1		/* shut down the writing side */

 #define	SHUT_RDWR	2		/* shut down both sides */

 #if __BSD_VISIBLE

 /*

  * sendfile(2) header/trailer struct

  */

 struct sf_hdtr {

 	struct iovec *headers;	/* pointer to an array of header struct iovec's */

 	int hdr_cnt;		/* number of header iovec's */

 	struct iovec *trailers;	/* pointer to an array of trailer struct iovec's */

 	int trl_cnt;		/* number of trailer iovec's */

 };

 /*

  * Sendfile-specific flag(s)

  */

 #define        SF_NODISKIO     0x00000001

 #endif

 #ifndef	_KERNEL

 #include <sys/cdefs.h>

 __BEGIN_DECLS

 IMPORT_C int	accept(int, struct sockaddr * __restrict, socklen_t * __restrict);

 IMPORT_C int	bind(int, const struct sockaddr *, socklen_t);

 IMPORT_C int	connect(int, const struct sockaddr *, socklen_t);

 IMPORT_C int	getpeername(int, struct sockaddr * __restrict, socklen_t * __restrict);

 IMPORT_C int	getsockname(int, struct sockaddr * __restrict, socklen_t * __restrict);

 IMPORT_C int	getsockopt(int, int, int, void * __restrict, socklen_t * __restrict);

 IMPORT_C int	listen(int, int);

 IMPORT_C ssize_t	recv(int, void *, size_t, int);

 IMPORT_C ssize_t	recvfrom(int, void *, size_t, int, struct sockaddr * __restrict, socklen_t * __restrict);

 IMPORT_C ssize_t	recvmsg(int, struct msghdr *, int);

 IMPORT_C ssize_t	send(int, const void *, size_t, int);

 IMPORT_C ssize_t	sendto(int, const void *,

 	    size_t, int, const struct sockaddr *, socklen_t);

 IMPORT_C ssize_t	sendmsg(int, const struct msghdr *, int);

 IMPORT_C int	setsockopt(int, int, int, const void *, socklen_t);

 IMPORT_C int	shutdown(int, int);

 IMPORT_C int	sockatmark(int);

 IMPORT_C int	socket(int, int, int);

 __END_DECLS

 #endif /* !_KERNEL */

 #endif /* !_SYS_SOCKET_H_ */