The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/sys/socket.h

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    1 /*-
    2  * Copyright (c) 1982, 1985, 1986, 1988, 1993, 1994
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)socket.h    8.4 (Berkeley) 2/21/94
   30  * $FreeBSD: src/sys/sys/socket.h,v 1.83.2.2 2005/09/27 21:54:03 rwatson Exp $
   31  */
   32 
   33 #ifndef _SYS_SOCKET_H_
   34 #define _SYS_SOCKET_H_
   35 
   36 #include <sys/cdefs.h>
   37 #include <sys/_types.h>
   38 #include <sys/_iovec.h>
   39 #define _NO_NAMESPACE_POLLUTION
   40 #include <machine/param.h>
   41 #undef _NO_NAMESPACE_POLLUTION
   42 
   43 /*
   44  * Definitions related to sockets: types, address families, options.
   45  */
   46 
   47 /*
   48  * Data types.
   49  */
   50 #if __BSD_VISIBLE
   51 #ifndef _GID_T_DECLARED
   52 typedef __gid_t         gid_t;
   53 #define _GID_T_DECLARED
   54 #endif
   55 
   56 #ifndef _OFF_T_DECLARED
   57 typedef __off_t         off_t;
   58 #define _OFF_T_DECLARED
   59 #endif
   60 
   61 #ifndef _PID_T_DECLARED
   62 typedef __pid_t         pid_t;
   63 #define _PID_T_DECLARED
   64 #endif
   65 #endif
   66 
   67 #ifndef _SA_FAMILY_T_DECLARED
   68 typedef __sa_family_t   sa_family_t;
   69 #define _SA_FAMILY_T_DECLARED
   70 #endif
   71 
   72 #ifndef _SOCKLEN_T_DECLARED
   73 typedef __socklen_t     socklen_t;
   74 #define _SOCKLEN_T_DECLARED
   75 #endif
   76  
   77 #ifndef _SSIZE_T_DECLARED
   78 typedef __ssize_t       ssize_t;
   79 #define _SSIZE_T_DECLARED
   80 #endif
   81 
   82 #if __BSD_VISIBLE 
   83 #ifndef _UID_T_DECLARED
   84 typedef __uid_t         uid_t;
   85 #define _UID_T_DECLARED
   86 #endif
   87 #endif
   88 
   89 /*
   90  * Types
   91  */
   92 #define SOCK_STREAM     1               /* stream socket */
   93 #define SOCK_DGRAM      2               /* datagram socket */
   94 #define SOCK_RAW        3               /* raw-protocol interface */
   95 #if __BSD_VISIBLE
   96 #define SOCK_RDM        4               /* reliably-delivered message */
   97 #endif
   98 #define SOCK_SEQPACKET  5               /* sequenced packet stream */
   99 
  100 /*
  101  * Option flags per-socket.
  102  */
  103 #define SO_DEBUG        0x0001          /* turn on debugging info recording */
  104 #define SO_ACCEPTCONN   0x0002          /* socket has had listen() */
  105 #define SO_REUSEADDR    0x0004          /* allow local address reuse */
  106 #define SO_KEEPALIVE    0x0008          /* keep connections alive */
  107 #define SO_DONTROUTE    0x0010          /* just use interface addresses */
  108 #define SO_BROADCAST    0x0020          /* permit sending of broadcast msgs */
  109 #if __BSD_VISIBLE
  110 #define SO_USELOOPBACK  0x0040          /* bypass hardware when possible */
  111 #endif
  112 #define SO_LINGER       0x0080          /* linger on close if data present */
  113 #define SO_OOBINLINE    0x0100          /* leave received OOB data in line */
  114 #if __BSD_VISIBLE
  115 #define SO_REUSEPORT    0x0200          /* allow local address & port reuse */
  116 #define SO_TIMESTAMP    0x0400          /* timestamp received dgram traffic */
  117 #define SO_NOSIGPIPE    0x0800          /* no SIGPIPE from EPIPE */
  118 #define SO_ACCEPTFILTER 0x1000          /* there is an accept filter */
  119 #define SO_BINTIME      0x2000          /* timestamp received dgram traffic */
  120 #endif
  121 
  122 /*
  123  * Additional options, not kept in so_options.
  124  */
  125 #define SO_SNDBUF       0x1001          /* send buffer size */
  126 #define SO_RCVBUF       0x1002          /* receive buffer size */
  127 #define SO_SNDLOWAT     0x1003          /* send low-water mark */
  128 #define SO_RCVLOWAT     0x1004          /* receive low-water mark */
  129 #define SO_SNDTIMEO     0x1005          /* send timeout */
  130 #define SO_RCVTIMEO     0x1006          /* receive timeout */
  131 #define SO_ERROR        0x1007          /* get error status and clear */
  132 #define SO_TYPE         0x1008          /* get socket type */
  133 #if __BSD_VISIBLE
  134 #define SO_LABEL        0x1009          /* socket's MAC label */
  135 #define SO_PEERLABEL    0x1010          /* socket's peer's MAC label */
  136 #define SO_LISTENQLIMIT 0x1011          /* socket's backlog limit */
  137 #define SO_LISTENQLEN   0x1012          /* socket's complete queue length */
  138 #define SO_LISTENINCQLEN        0x1013  /* socket's incomplete queue length */
  139 #endif
  140 
  141 /*
  142  * Structure used for manipulating linger option.
  143  */
  144 struct linger {
  145         int     l_onoff;                /* option on/off */
  146         int     l_linger;               /* linger time */
  147 };
  148 
  149 #if __BSD_VISIBLE
  150 struct accept_filter_arg {
  151         char    af_name[16];
  152         char    af_arg[256-16];
  153 };
  154 #endif
  155 
  156 /*
  157  * Level number for (get/set)sockopt() to apply to socket itself.
  158  */
  159 #define SOL_SOCKET      0xffff          /* options for socket level */
  160 
  161 /*
  162  * Address families.
  163  */
  164 #define AF_UNSPEC       0               /* unspecified */
  165 #if __BSD_VISIBLE
  166 #define AF_LOCAL        AF_UNIX         /* local to host (pipes, portals) */
  167 #endif
  168 #define AF_UNIX         1               /* standardized name for AF_LOCAL */
  169 #define AF_INET         2               /* internetwork: UDP, TCP, etc. */
  170 #if __BSD_VISIBLE
  171 #define AF_IMPLINK      3               /* arpanet imp addresses */
  172 #define AF_PUP          4               /* pup protocols: e.g. BSP */
  173 #define AF_CHAOS        5               /* mit CHAOS protocols */
  174 #define AF_NETBIOS      6               /* SMB protocols */
  175 #define AF_ISO          7               /* ISO protocols */
  176 #define AF_OSI          AF_ISO
  177 #define AF_ECMA         8               /* European computer manufacturers */
  178 #define AF_DATAKIT      9               /* datakit protocols */
  179 #define AF_CCITT        10              /* CCITT protocols, X.25 etc */
  180 #define AF_SNA          11              /* IBM SNA */
  181 #define AF_DECnet       12              /* DECnet */
  182 #define AF_DLI          13              /* DEC Direct data link interface */
  183 #define AF_LAT          14              /* LAT */
  184 #define AF_HYLINK       15              /* NSC Hyperchannel */
  185 #define AF_APPLETALK    16              /* Apple Talk */
  186 #define AF_ROUTE        17              /* Internal Routing Protocol */
  187 #define AF_LINK         18              /* Link layer interface */
  188 #define pseudo_AF_XTP   19              /* eXpress Transfer Protocol (no AF) */
  189 #define AF_COIP         20              /* connection-oriented IP, aka ST II */
  190 #define AF_CNT          21              /* Computer Network Technology */
  191 #define pseudo_AF_RTIP  22              /* Help Identify RTIP packets */
  192 #define AF_IPX          23              /* Novell Internet Protocol */
  193 #define AF_SIP          24              /* Simple Internet Protocol */
  194 #define pseudo_AF_PIP   25              /* Help Identify PIP packets */
  195 #define AF_ISDN         26              /* Integrated Services Digital Network*/
  196 #define AF_E164         AF_ISDN         /* CCITT E.164 recommendation */
  197 #define pseudo_AF_KEY   27              /* Internal key-management function */
  198 #endif
  199 #define AF_INET6        28              /* IPv6 */
  200 #if __BSD_VISIBLE
  201 #define AF_NATM         29              /* native ATM access */
  202 #define AF_ATM          30              /* ATM */
  203 #define pseudo_AF_HDRCMPLT 31           /* Used by BPF to not rewrite headers
  204                                          * in interface output routine
  205                                          */
  206 #define AF_NETGRAPH     32              /* Netgraph sockets */
  207 #define AF_SLOW         33              /* 802.3ad slow protocol */
  208 #define AF_SCLUSTER     34              /* Sitara cluster protocol */
  209 #define AF_ARP          35
  210 #define AF_BLUETOOTH    36              /* Bluetooth sockets */
  211 #define AF_MAX          37
  212 #endif
  213 
  214 /*
  215  * Structure used by kernel to store most
  216  * addresses.
  217  */
  218 struct sockaddr {
  219         unsigned char   sa_len;         /* total length */
  220         sa_family_t     sa_family;      /* address family */
  221         char            sa_data[14];    /* actually longer; address value */
  222 };
  223 #if __BSD_VISIBLE
  224 #define SOCK_MAXADDRLEN 255             /* longest possible addresses */
  225 
  226 /*
  227  * Structure used by kernel to pass protocol
  228  * information in raw sockets.
  229  */
  230 struct sockproto {
  231         unsigned short  sp_family;              /* address family */
  232         unsigned short  sp_protocol;            /* protocol */
  233 };
  234 #endif
  235 
  236 /*
  237  * RFC 2553: protocol-independent placeholder for socket addresses
  238  */
  239 #define _SS_MAXSIZE     128U
  240 #define _SS_ALIGNSIZE   (sizeof(__int64_t))
  241 #define _SS_PAD1SIZE    (_SS_ALIGNSIZE - sizeof(unsigned char) - \
  242                             sizeof(sa_family_t))
  243 #define _SS_PAD2SIZE    (_SS_MAXSIZE - sizeof(unsigned char) - \
  244                             sizeof(sa_family_t) - _SS_PAD1SIZE - _SS_ALIGNSIZE)
  245 
  246 struct sockaddr_storage {
  247         unsigned char   ss_len;         /* address length */
  248         sa_family_t     ss_family;      /* address family */
  249         char            __ss_pad1[_SS_PAD1SIZE];
  250         __int64_t       __ss_align;     /* force desired struct alignment */
  251         char            __ss_pad2[_SS_PAD2SIZE];
  252 };
  253 
  254 #if __BSD_VISIBLE
  255 /*
  256  * Protocol families, same as address families for now.
  257  */
  258 #define PF_UNSPEC       AF_UNSPEC
  259 #define PF_LOCAL        AF_LOCAL
  260 #define PF_UNIX         PF_LOCAL        /* backward compatibility */
  261 #define PF_INET         AF_INET
  262 #define PF_IMPLINK      AF_IMPLINK
  263 #define PF_PUP          AF_PUP
  264 #define PF_CHAOS        AF_CHAOS
  265 #define PF_NETBIOS      AF_NETBIOS
  266 #define PF_ISO          AF_ISO
  267 #define PF_OSI          AF_ISO
  268 #define PF_ECMA         AF_ECMA
  269 #define PF_DATAKIT      AF_DATAKIT
  270 #define PF_CCITT        AF_CCITT
  271 #define PF_SNA          AF_SNA
  272 #define PF_DECnet       AF_DECnet
  273 #define PF_DLI          AF_DLI
  274 #define PF_LAT          AF_LAT
  275 #define PF_HYLINK       AF_HYLINK
  276 #define PF_APPLETALK    AF_APPLETALK
  277 #define PF_ROUTE        AF_ROUTE
  278 #define PF_LINK         AF_LINK
  279 #define PF_XTP          pseudo_AF_XTP   /* really just proto family, no AF */
  280 #define PF_COIP         AF_COIP
  281 #define PF_CNT          AF_CNT
  282 #define PF_SIP          AF_SIP
  283 #define PF_IPX          AF_IPX
  284 #define PF_RTIP         pseudo_AF_RTIP  /* same format as AF_INET */
  285 #define PF_PIP          pseudo_AF_PIP
  286 #define PF_ISDN         AF_ISDN
  287 #define PF_KEY          pseudo_AF_KEY
  288 #define PF_INET6        AF_INET6
  289 #define PF_NATM         AF_NATM
  290 #define PF_ATM          AF_ATM
  291 #define PF_NETGRAPH     AF_NETGRAPH
  292 #define PF_SLOW         AF_SLOW
  293 #define PF_SCLUSTER     AF_SCLUSTER
  294 #define PF_ARP          AF_ARP
  295 #define PF_BLUETOOTH    AF_BLUETOOTH
  296 
  297 #define PF_MAX          AF_MAX
  298 
  299 /*
  300  * Definitions for network related sysctl, CTL_NET.
  301  *
  302  * Second level is protocol family.
  303  * Third level is protocol number.
  304  *
  305  * Further levels are defined by the individual families below.
  306  */
  307 #define NET_MAXID       AF_MAX
  308 
  309 #define CTL_NET_NAMES { \
  310         { 0, 0 }, \
  311         { "unix", CTLTYPE_NODE }, \
  312         { "inet", CTLTYPE_NODE }, \
  313         { "implink", CTLTYPE_NODE }, \
  314         { "pup", CTLTYPE_NODE }, \
  315         { "chaos", CTLTYPE_NODE }, \
  316         { "xerox_ns", CTLTYPE_NODE }, \
  317         { "iso", CTLTYPE_NODE }, \
  318         { "emca", CTLTYPE_NODE }, \
  319         { "datakit", CTLTYPE_NODE }, \
  320         { "ccitt", CTLTYPE_NODE }, \
  321         { "ibm_sna", CTLTYPE_NODE }, \
  322         { "decnet", CTLTYPE_NODE }, \
  323         { "dec_dli", CTLTYPE_NODE }, \
  324         { "lat", CTLTYPE_NODE }, \
  325         { "hylink", CTLTYPE_NODE }, \
  326         { "appletalk", CTLTYPE_NODE }, \
  327         { "route", CTLTYPE_NODE }, \
  328         { "link_layer", CTLTYPE_NODE }, \
  329         { "xtp", CTLTYPE_NODE }, \
  330         { "coip", CTLTYPE_NODE }, \
  331         { "cnt", CTLTYPE_NODE }, \
  332         { "rtip", CTLTYPE_NODE }, \
  333         { "ipx", CTLTYPE_NODE }, \
  334         { "sip", CTLTYPE_NODE }, \
  335         { "pip", CTLTYPE_NODE }, \
  336         { "isdn", CTLTYPE_NODE }, \
  337         { "key", CTLTYPE_NODE }, \
  338         { "inet6", CTLTYPE_NODE }, \
  339         { "natm", CTLTYPE_NODE }, \
  340         { "atm", CTLTYPE_NODE }, \
  341         { "hdrcomplete", CTLTYPE_NODE }, \
  342         { "netgraph", CTLTYPE_NODE }, \
  343         { "snp", CTLTYPE_NODE }, \
  344         { "scp", CTLTYPE_NODE }, \
  345 }
  346 
  347 /*
  348  * PF_ROUTE - Routing table
  349  *
  350  * Three additional levels are defined:
  351  *      Fourth: address family, 0 is wildcard
  352  *      Fifth: type of info, defined below
  353  *      Sixth: flag(s) to mask with for NET_RT_FLAGS
  354  */
  355 #define NET_RT_DUMP     1               /* dump; may limit to a.f. */
  356 #define NET_RT_FLAGS    2               /* by flags, e.g. RESOLVING */
  357 #define NET_RT_IFLIST   3               /* survey interface list */
  358 #define NET_RT_IFMALIST 4               /* return multicast address list */
  359 #define NET_RT_MAXID    5
  360 
  361 #define CTL_NET_RT_NAMES { \
  362         { 0, 0 }, \
  363         { "dump", CTLTYPE_STRUCT }, \
  364         { "flags", CTLTYPE_STRUCT }, \
  365         { "iflist", CTLTYPE_STRUCT }, \
  366         { "ifmalist", CTLTYPE_STRUCT }, \
  367 }
  368 #endif /* __BSD_VISIBLE */
  369 
  370 /*
  371  * Maximum queue length specifiable by listen.
  372  */
  373 #define SOMAXCONN       128
  374 
  375 /*
  376  * Message header for recvmsg and sendmsg calls.
  377  * Used value-result for recvmsg, value only for sendmsg.
  378  */
  379 struct msghdr {
  380         void            *msg_name;              /* optional address */
  381         socklen_t        msg_namelen;           /* size of address */
  382         struct iovec    *msg_iov;               /* scatter/gather array */
  383         int              msg_iovlen;            /* # elements in msg_iov */
  384         void            *msg_control;           /* ancillary data, see below */
  385         socklen_t        msg_controllen;        /* ancillary data buffer len */
  386         int              msg_flags;             /* flags on received message */
  387 };
  388 
  389 #define MSG_OOB         0x1             /* process out-of-band data */
  390 #define MSG_PEEK        0x2             /* peek at incoming message */
  391 #define MSG_DONTROUTE   0x4             /* send without using routing tables */
  392 #define MSG_EOR         0x8             /* data completes record */
  393 #define MSG_TRUNC       0x10            /* data discarded before delivery */
  394 #define MSG_CTRUNC      0x20            /* control data lost before delivery */
  395 #define MSG_WAITALL     0x40            /* wait for full request or error */
  396 #if __BSD_VISIBLE
  397 #define MSG_DONTWAIT    0x80            /* this message should be nonblocking */
  398 #define MSG_EOF         0x100           /* data completes connection */
  399 #define MSG_NBIO        0x4000          /* FIONBIO mode, used by fifofs */
  400 #define MSG_COMPAT      0x8000          /* used in sendit() */
  401 #endif
  402 
  403 /*
  404  * Header for ancillary data objects in msg_control buffer.
  405  * Used for additional information with/about a datagram
  406  * not expressible by flags.  The format is a sequence
  407  * of message elements headed by cmsghdr structures.
  408  */
  409 struct cmsghdr {
  410         socklen_t       cmsg_len;               /* data byte count, including hdr */
  411         int             cmsg_level;             /* originating protocol */
  412         int             cmsg_type;              /* protocol-specific type */
  413 /* followed by  u_char  cmsg_data[]; */
  414 };
  415 
  416 #if __BSD_VISIBLE
  417 /*
  418  * While we may have more groups than this, the cmsgcred struct must
  419  * be able to fit in an mbuf, and NGROUPS_MAX is too large to allow
  420  * this.
  421 */
  422 #define CMGROUP_MAX 16
  423 
  424 /*
  425  * Credentials structure, used to verify the identity of a peer
  426  * process that has sent us a message. This is allocated by the
  427  * peer process but filled in by the kernel. This prevents the
  428  * peer from lying about its identity. (Note that cmcred_groups[0]
  429  * is the effective GID.)
  430  */
  431 struct cmsgcred {
  432         pid_t   cmcred_pid;             /* PID of sending process */
  433         uid_t   cmcred_uid;             /* real UID of sending process */
  434         uid_t   cmcred_euid;            /* effective UID of sending process */
  435         gid_t   cmcred_gid;             /* real GID of sending process */
  436         short   cmcred_ngroups;         /* number or groups */
  437         gid_t   cmcred_groups[CMGROUP_MAX];     /* groups */
  438 };
  439 #endif /* __BSD_VISIBLE */
  440 
  441 /* given pointer to struct cmsghdr, return pointer to data */
  442 #define CMSG_DATA(cmsg)         ((unsigned char *)(cmsg) + \
  443                                  _ALIGN(sizeof(struct cmsghdr)))
  444 
  445 /* given pointer to struct cmsghdr, return pointer to next cmsghdr */
  446 #define CMSG_NXTHDR(mhdr, cmsg) \
  447         (((char *)(cmsg) + _ALIGN((cmsg)->cmsg_len) + \
  448           _ALIGN(sizeof(struct cmsghdr)) > \
  449             (char *)(mhdr)->msg_control + (mhdr)->msg_controllen) ? \
  450             (struct cmsghdr *)0 : \
  451             (struct cmsghdr *)((char *)(cmsg) + _ALIGN((cmsg)->cmsg_len)))
  452 
  453 /*
  454  * RFC 2292 requires to check msg_controllen, in case that the kernel returns
  455  * an empty list for some reasons.
  456  */
  457 #define CMSG_FIRSTHDR(mhdr) \
  458         ((mhdr)->msg_controllen >= sizeof(struct cmsghdr) ? \
  459          (struct cmsghdr *)(mhdr)->msg_control : \
  460          (struct cmsghdr *)NULL)
  461 
  462 #if __BSD_VISIBLE
  463 /* RFC 2292 additions */
  464 #define CMSG_SPACE(l)           (_ALIGN(sizeof(struct cmsghdr)) + _ALIGN(l))
  465 #define CMSG_LEN(l)             (_ALIGN(sizeof(struct cmsghdr)) + (l))
  466 #endif
  467 
  468 #ifdef _KERNEL
  469 #define CMSG_ALIGN(n)   _ALIGN(n)
  470 #endif
  471 
  472 /* "Socket"-level control message types: */
  473 #define SCM_RIGHTS      0x01            /* access rights (array of int) */
  474 #if __BSD_VISIBLE
  475 #define SCM_TIMESTAMP   0x02            /* timestamp (struct timeval) */
  476 #define SCM_CREDS       0x03            /* process creds (struct cmsgcred) */
  477 #define SCM_BINTIME     0x04            /* timestamp (struct bintime) */
  478 #endif
  479 
  480 #if __BSD_VISIBLE
  481 /*
  482  * 4.3 compat sockaddr, move to compat file later
  483  */
  484 struct osockaddr {
  485         unsigned short sa_family;       /* address family */
  486         char    sa_data[14];            /* up to 14 bytes of direct address */
  487 };
  488 
  489 /*
  490  * 4.3-compat message header (move to compat file later).
  491  */
  492 struct omsghdr {
  493         char    *msg_name;              /* optional address */
  494         int     msg_namelen;            /* size of address */
  495         struct  iovec *msg_iov;         /* scatter/gather array */
  496         int     msg_iovlen;             /* # elements in msg_iov */
  497         char    *msg_accrights;         /* access rights sent/received */
  498         int     msg_accrightslen;
  499 };
  500 #endif
  501 
  502 /*
  503  * howto arguments for shutdown(2), specified by Posix.1g.
  504  */
  505 #define SHUT_RD         0               /* shut down the reading side */
  506 #define SHUT_WR         1               /* shut down the writing side */
  507 #define SHUT_RDWR       2               /* shut down both sides */
  508 
  509 #if __BSD_VISIBLE
  510 /*
  511  * sendfile(2) header/trailer struct
  512  */
  513 struct sf_hdtr {
  514         struct iovec *headers;  /* pointer to an array of header struct iovec's */
  515         int hdr_cnt;            /* number of header iovec's */
  516         struct iovec *trailers; /* pointer to an array of trailer struct iovec's */
  517         int trl_cnt;            /* number of trailer iovec's */
  518 };
  519 
  520 /*
  521  * Sendfile-specific flag(s)
  522  */
  523 #define        SF_NODISKIO     0x00000001
  524 #endif
  525 
  526 #ifndef _KERNEL
  527 
  528 #include <sys/cdefs.h>
  529 
  530 __BEGIN_DECLS
  531 int     accept(int, struct sockaddr * __restrict, socklen_t * __restrict);
  532 int     bind(int, const struct sockaddr *, socklen_t);
  533 int     connect(int, const struct sockaddr *, socklen_t);
  534 int     getpeername(int, struct sockaddr * __restrict, socklen_t * __restrict);
  535 int     getsockname(int, struct sockaddr * __restrict, socklen_t * __restrict);
  536 int     getsockopt(int, int, int, void * __restrict, socklen_t * __restrict);
  537 int     listen(int, int);
  538 ssize_t recv(int, void *, size_t, int);
  539 ssize_t recvfrom(int, void *, size_t, int, struct sockaddr * __restrict, socklen_t * __restrict);
  540 ssize_t recvmsg(int, struct msghdr *, int);
  541 ssize_t send(int, const void *, size_t, int);
  542 ssize_t sendto(int, const void *,
  543             size_t, int, const struct sockaddr *, socklen_t);
  544 ssize_t sendmsg(int, const struct msghdr *, int);
  545 #if __BSD_VISIBLE
  546 int     sendfile(int, int, off_t, size_t, struct sf_hdtr *, off_t *, int);
  547 #endif
  548 int     setsockopt(int, int, int, const void *, socklen_t);
  549 int     shutdown(int, int);
  550 int     sockatmark(int);
  551 int     socket(int, int, int);
  552 int     socketpair(int, int, int, int *);
  553 __END_DECLS
  554 
  555 #endif /* !_KERNEL */
  556 
  557 #endif /* !_SYS_SOCKET_H_ */

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