socket.h

介绍：MySQL是比较出名的数据库软件

/*      @(#)socket.h	6.23 7/18/94 - STREAMware TCP/IP  source        */
/*
 * Copyrighted as an unpublished work.
 * (c) Copyright 1987-1994 Legent Corporation
 * All rights reserved.
 *
 * RESTRICTED RIGHTS
 *
 * These programs are supplied under a license.  They may be used,
 * disclosed, and/or copied only as permitted under such license
 * agreement.  Any copy must contain the above copyright notice and
 * this restricted rights notice.  Use, copying, and/or disclosure
 * of the programs is strictly prohibited unless otherwise provided
 * in the license agreement.
 *
 */
/*      SCCS IDENTIFICATION        */
/*
 * Copyright (c) 1985 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef __sys_socket_h
#define __sys_socket_h

#if !defined(FD_SETSIZE)
/* Pick up select stuff from standard system include */
#include <sys/types.h>
#endif

/* socket.h	6.1	83/07/29	 */

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

/*
 * 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_ORDREL	0x0200	/* give use orderly release */
#define SO_IMASOCKET	0x0400	/* use socket semantics (affects bind) */
#define SO_MGMT		0x0800	/* => it is used for mgmt. purposes */
#define	SO_REUSEPORT	0x1000	/* allow local port reuse */

/*
 * 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 */
#define SO_PROTOTYPE	0x1009	/* get/set protocol type */

/*
 * Structure used for manipulating linger option.
 */
struct linger {
	int             l_onoff;	/* option on/off */
	int             l_linger;	/* linger time */
};

/*
 * Level number for (get/set)sockopt() to apply to socket itself.
 */
#define	SOL_SOCKET	0xffff	/* options for socket level */

/*
 * An option specification consists of an opthdr, followed by the value of
 * the option.  An options buffer contains one or more options.  The len
 * field of opthdr specifies the length of the option value in bytes.  This
 * length must be a multiple of sizeof(long) (use OPTLEN macro).
 */

struct opthdr {
	long            level;	/* protocol level affected */
	long            name;	/* option to modify */
	long            len;	/* length of option value */
};

#define OPTLEN(x) ((((x) + sizeof(long) - 1) / sizeof(long)) * sizeof(long))
#define OPTVAL(opt) ((char *)(opt + 1))

#if defined(INKERNEL) || defined(_KERNEL) || defined(_INKERNEL)
/*
 * the optdefault structure is used for internal tables of option default
 * values.
 */
struct optdefault {
	int             optname;/* the option */
	char           *val;	/* ptr to default value */
	int             len;	/* length of value */
};

/*
 * the opproc structure is used to build tables of options processing
 * functions for in_dooptions().
 */
struct opproc {
	int             level;	/* options level this function handles */
	int             (*func) ();	/* the function */
};
#endif

/*
 * Address families.
 */
#define	AF_UNSPEC	0	/* unspecified */
#define	AF_UNIX		1	/* local to host (pipes, portals) */
#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	/* 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_MAX          20

/*
 * Structure used by kernel to store most addresses.
 */
struct sockaddr {
	u_short         sa_family;	/* address family */
	char            sa_data[14];	/* up to 14 bytes of direct address */
};

/*
 * Structure used by kernel to pass protocol information in raw sockets.
 */
struct sockproto {
	unsigned short  sp_family;	/* address family */
	unsigned short  sp_protocol;	/* protocol */
};

/*
 * Protocol families, same as address families for now.
 */
#define	PF_UNSPEC	AF_UNSPEC
#define	PF_UNIX		AF_UNIX
#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_NBS		AF_NBS
#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_MAX          AF_MAX

/*
 * Maximum queue length specifiable by listen.
 */
#define SOMAXCONN       5

/*
 * Message header for recvmsg and sendmsg calls.
 * Used value-result for recmvsg, value only for sendmsg.
 */
struct msghdr {
	caddr_t         msg_name;	/* optional address */
	u_int           msg_namelen;	/* size of address */
	struct iovec   *msg_iov;	/* scatter/gather array */
	u_int           msg_iovlen;	/* # elements msg_iov */
	caddr_t         msg_control;	/* ancillary data, see below */
	u_int           msg_controllen;	/* ancillary data buffer len */
	int		msg_flags;	/* flags on received message */
};
#define msg_accrights		msg_control
#define	msg_accrightslen	msg_controllen

#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 */ /*notused*/
#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 */ /*notused*/

#define	MSG_MAXIOVLEN	16

/*
 * 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.
 * In STREAMware, we shuffle the fields around a little from what
 * they were in net-2, so that they line up the same as an opthdr
 * which simplifies our socket implementation amazingly.
 *