FreeBSD/Linux Kernel Cross Reference
sys/common/sys/socket.h

     /*
      * CDDL HEADER START
      *
      * The contents of this file are subject to the terms of the
      * Common Development and Distribution License (the "License").
      * You may not use this file except in compliance with the License.
      *
      * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      * or http://www.opensolaris.org/os/licensing.
     * See the License for the specific language governing permissions
     * and limitations under the License.
     *
     * When distributing Covered Code, include this CDDL HEADER in each
     * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     * If applicable, add the following below this CDDL HEADER, with the
     * fields enclosed by brackets "[]" replaced with your own identifying
     * information: Portions Copyright [yyyy] [name of copyright owner]
     *
     * CDDL HEADER END
     */
    /*
     * Copyright (c) 1989, 2010, Oracle and/or its affiliates. All rights reserved.
     */
    
    /*      Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T     */
    /*        All Rights Reserved   */
    
    /*
     * University Copyright- Copyright (c) 1982, 1986, 1988
     * The Regents of the University of California
     * All Rights Reserved
     *
     * University Acknowledgment- Portions of this document are derived from
     * software developed by the University of California, Berkeley, and its
     * contributors.
     */
    
    #ifndef _SYS_SOCKET_H
    #define _SYS_SOCKET_H
    
    #include <sys/types.h>
    #include <sys/uio.h>
    #include <sys/feature_tests.h>
    #include <sys/socket_impl.h>
    #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
    #ifndef _KERNEL
    #include <sys/netconfig.h>
    #endif  /* !_KERNEL */
    #include <netinet/in.h>
    #endif  /* !defined(_XPG4_2) || defined(__EXTENSIONS__) */
    
    #ifdef  __cplusplus
    extern "C" {
    #endif
    
    #ifndef _SOCKLEN_T
    #define _SOCKLEN_T
    
    /*
     * The socklen definitions are reproduced in netinet/in.h for the inet6_
     * functions.  Exposing all of sys/socket.h via netinet/in.h breaks existing
     * applications and is not required by austin.
     */
    #if defined(_XPG4_2) && !defined(_XPG5) && !defined(_LP64)
    typedef size_t          socklen_t;
    #else
    typedef uint32_t        socklen_t;
    #endif  /* defined(_XPG4_2) && !defined(_XPG5) && !defined(_LP64) */
    
    #if defined(_XPG4_2) || defined(_BOOT)
    typedef socklen_t       *_RESTRICT_KYWD Psocklen_t;
    #else
    typedef void            *_RESTRICT_KYWD Psocklen_t;
    #endif  /* defined(_XPG4_2) || defined(_BOOT) */
    
    #endif  /* _SOCKLEN_T */
    
    /*
     * Definitions related to sockets: types, address families, options.
     */
    #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
    #ifndef NC_TPI_CLTS
    #define NC_TPI_CLTS     1               /* must agree with netconfig.h */
    #define NC_TPI_COTS     2               /* must agree with netconfig.h */
    #define NC_TPI_COTS_ORD 3               /* must agree with netconfig.h */
    #define NC_TPI_RAW      4               /* must agree with netconfig.h */
    #endif  /* !NC_TPI_CLTS */
    #endif  /* !defined(_XPG4_2) || defined(__EXTENSIONS__) */
    
    /*
     * Types
     */
    #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
    #define SOCK_STREAM     NC_TPI_COTS     /* stream socket */
    #define SOCK_DGRAM      NC_TPI_CLTS     /* datagram socket */
    #define SOCK_RAW        NC_TPI_RAW      /* raw-protocol interface */
    #else
    #define SOCK_STREAM     2               /* stream socket */
    #define SOCK_DGRAM      1               /* datagram socket */
   #define SOCK_RAW        4               /* raw-protocol interface */
   #endif  /* !defined(_XPG4_2) || defined(__EXTENSIONS__) */
   #define SOCK_RDM        5               /* reliably-delivered message */
   #define SOCK_SEQPACKET  6               /* 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_DGRAM_ERRIND 0x0200          /* Application wants delayed error */
   #define SO_RECVUCRED    0x0400          /* Application wants ucred of sender */
   
   /*
    * Socket options are passed using a signed integer, but it is also rare
    * for more than one to ever be passed at the same time with setsockopt
    * and only one at a time can be retrieved with getsockopt.
    *
    * Since the lower numbers cannot be renumbered for compatibility reasons,
    * it would seem that we need to start a new number space (0x40000000 -
    * 0x7fffffff) for those that don't need to be stored as a bit flag
    * somewhere. This limits the flag options to 30 but that seems to be
    * plenty, anyway. 0x40000000 is reserved for future use.
    */
   #define SO_ATTACH_FILTER        0x40000001
   #define SO_DETACH_FILTER        0x40000002
   
   #ifdef _KERNEL
   #define SO_SND_COPYAVOID 0x0800         /* Internal: use zero-copy */
   #define SO_SND_BUFINFO  0x1000          /* Internal: get buffer info */
                                           /* when doing zero-copy */
   
   struct so_snd_bufinfo {
           ushort_t        sbi_wroff;      /* Write offset */
           ssize_t         sbi_maxblk;     /* Max size of a single mblk */
           ssize_t         sbi_maxpsz;     /* Max total size of a mblk chain */
           ushort_t        sbi_tail;       /* Extra space available at the end */
   };
   #endif /* _KERNEL */
   
   /*
    * N.B.: The following definition is present only for compatibility
    * with release 3.0.  It will disappear in later releases.
    */
   #define SO_DONTLINGER   (~SO_LINGER)    /* ~SO_LINGER */
   
   /*
    * 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 */
   #define SO_ANON_MLP     0x100a          /* create MLP on anonymous bind */
   #define SO_MAC_EXEMPT   0x100b          /* allow dominated unlabeled peers */
   #define SO_DOMAIN       0x100c          /* get socket domain */
   #define SO_RCVPSH       0x100d          /* receive interval to push data */
   
   /* "Socket"-level control message types: */
   #define SCM_RIGHTS      0x1010          /* access rights (array of int) */
   #define SO_SECATTR      0x1011          /* socket's security attributes */
   #define SCM_UCRED       0x1012          /* sender's ucred */
   #define SO_TIMESTAMP    0x1013          /* socket-level timestamp option */
   #define SCM_TIMESTAMP   SO_TIMESTAMP    /* socket control message timestamp */
   #define SO_ALLZONES     0x1014          /* bind in all zones */
   #define SO_EXCLBIND     0x1015          /* exclusive binding */
   #define SO_MAC_IMPLICIT 0x1016          /* hide mac labels on wire */
   #define SO_VRRP         0x1017          /* VRRP control socket */
   
   #ifdef  _KERNEL
   #define SO_SRCADDR      0x2001          /* Internal: AF_UNIX source address */
   #define SO_FILEP        0x2002          /* Internal: AF_UNIX file pointer */
   #define SO_UNIX_CLOSE   0x2003          /* Internal: AF_UNIX peer closed */
   #endif  /* _KERNEL */
   
   /*
    * Socket filter options
    */
   #define FIL_ATTACH      0x1             /* attach filter */
   #define FIL_DETACH      0x2             /* detach filter */
   #define FIL_LIST        0x3             /* list attached filters */
   
   #define FILNAME_MAX     32
   /*
    * Structure returned by FIL_LIST
    */
   struct fil_info {
           int     fi_flags;               /* see below (FILF_*) */
           int     fi_pos;                 /* position (0 is bottom) */
           char    fi_name[FILNAME_MAX];   /* filter name */
   };
   
   #define FILF_PROG       0x1             /* programmatic attach */
   #define FILF_AUTO       0x2             /* automatic attach */
   #define FILF_BYPASS     0x4             /* filter is not active */
   
   #ifdef  _KERNEL
   /*
    * new socket open flags to identify socket and acceptor streams
    */
   #define SO_ACCEPTOR     0x20000         /* acceptor socket */
   #define SO_SOCKSTR      0x40000         /* normal socket stream */
   #define SO_FALLBACK     0x80000         /* fallback to TPI socket */
   
   /*
    * Flags for socket_create() and socket_newconn()
    */
   #define SOCKET_SLEEP    KM_SLEEP
   #define SOCKET_NOSLEEP  KM_NOSLEEP
   
   #endif  /* _KERNEL */
   
   /*
    * Structure used for manipulating linger option.
    */
   struct  linger {
           int     l_onoff;                /* option on/off */
           int     l_linger;               /* linger time */
   };
   
   /*
    * Levels for (get/set)sockopt() that don't apply to a specific protocol.
    */
   #define SOL_SOCKET      0xffff          /* options for socket level */
   #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
   #define SOL_ROUTE       0xfffe          /* options for routing socket level */
   #endif
   #define SOL_PACKET      0xfffd          /* options for packet level */
   #define SOL_FILTER      0xfffc          /* options for socket filter level */
   
   /*
    * Address families.
    *
    * Some of these constant names are copied for the DTrace IP provider in
    * usr/src/lib/libdtrace/common/{ip.d.in, ip.sed.in}, which should be kept
    * in sync.
    */
   #define AF_UNSPEC       0               /* unspecified */
   #define AF_UNIX         1               /* local to host (pipes, portals) */
   #define AF_LOCAL        AF_UNIX         /* Synonym for AF_UNIX */
   #define AF_FILE         AF_UNIX         /* Synonym for AF_UNIX */
   #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_NBS          7               /* nbs protocols */
   #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_NIT          17              /* Network Interface Tap */
   #define AF_802          18              /* IEEE 802.2, also ISO 8802 */
   #define AF_OSI          19              /* umbrella for all families used */
   #define AF_X25          20              /* CCITT X.25 in particular */
   #define AF_OSINET       21              /* AFI = 47, IDI = 4 */
   #define AF_GOSIP        22              /* U.S. Government OSI */
   #define AF_IPX          23              /* Novell Internet Protocol */
   #define AF_ROUTE        24              /* Internal Routing Protocol */
   #define AF_LINK         25              /* Link-layer interface */
   #define AF_INET6        26              /* Internet Protocol, Version 6 */
   #define AF_KEY          27              /* Security Association DB socket */
   #define AF_NCA          28              /* NCA socket */
   #define AF_POLICY       29              /* Security Policy DB socket */
   #define AF_INET_OFFLOAD 30              /* Sun private; do not use */
   #define AF_TRILL        31              /* TRILL interface */
   #define AF_PACKET       32              /* PF_PACKET Linux socket interface */
   
   #define AF_MAX          32
   
   /*
    * Protocol families, same as address families for now.
    */
   #define PF_UNSPEC       AF_UNSPEC
   #define PF_UNIX         AF_UNIX
   #define PF_LOCAL        PF_UNIX
   #define PF_FILE         PF_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_NIT          AF_NIT
   #define PF_802          AF_802
   #define PF_OSI          AF_OSI
   #define PF_X25          AF_X25
   #define PF_OSINET       AF_OSINET
   #define PF_GOSIP        AF_GOSIP
   #define PF_IPX          AF_IPX
   #define PF_ROUTE        AF_ROUTE
   #define PF_LINK         AF_LINK
   #define PF_INET6        AF_INET6
   #define PF_KEY          AF_KEY
   #define PF_NCA          AF_NCA
   #define PF_POLICY       AF_POLICY
   #define PF_INET_OFFLOAD AF_INET_OFFLOAD /* Sun private; do not use */
   #define PF_TRILL        AF_TRILL
   #define PF_PACKET       AF_PACKET
   
   #define PF_MAX          AF_MAX
   
   /*
    * Maximum queue length specifiable by listen.
    */
   #define SOMAXCONN       128
   
   /*
    * Message header for recvmsg and sendmsg calls.
    */
   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 */
   
   #if defined(_XPG4_2) || defined(_KERNEL)
           void            *msg_control;           /* ancillary data */
           socklen_t       msg_controllen;         /* ancillary data buffer len */
           int             msg_flags;              /* flags on received message */
   #else
           caddr_t         msg_accrights;  /* access rights sent/received */
           int             msg_accrightslen;
   #endif  /* defined(_XPG4_2) || defined(_KERNEL) */
   };
   
   #if     defined(_KERNEL)
   
   /*
    *      N.B.:  we assume that omsghdr and nmsghdr are isomorphic, with
    *      the sole exception that nmsghdr has the additional msg_flags
    *      field at the end.
    */
   struct omsghdr {
           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 */
           caddr_t         msg_accrights;  /* access rights sent/received */
           int             msg_accrightslen;
   };
   
   #define nmsghdr         msghdr
   
   #if defined(_SYSCALL32)
   
   struct omsghdr32 {
           caddr32_t       msg_name;       /* optional address */
           uint32_t        msg_namelen;    /* size of address */
           caddr32_t       msg_iov;        /* scatter/gather array */
           int32_t         msg_iovlen;     /* # elements in msg_iov */
           caddr32_t       msg_accrights;  /* access rights sent/received */
           uint32_t        msg_accrightslen;
   };
   
   struct msghdr32 {
           caddr32_t       msg_name;       /* optional address */
           uint32_t        msg_namelen;    /* size of address */
           caddr32_t       msg_iov;        /* scatter/gather array */
           int32_t         msg_iovlen;     /* # elements in msg_iov */
           caddr32_t       msg_control;    /* ancillary data */
           uint32_t        msg_controllen; /* ancillary data buffer len */
           int32_t         msg_flags;      /* flags on received message */
   };
   
   #define nmsghdr32       msghdr32
   
   #endif  /* _SYSCALL32 */
   #endif  /* _KERNEL */
   
   #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 */
   /* Added for XPGv2 compliance */
   #define MSG_EOR         0x8             /* Terminates a record */
   #define MSG_CTRUNC      0x10            /* Control data truncated */
   #define MSG_TRUNC       0x20            /* Normal data truncated */
   #define MSG_WAITALL     0x40            /* Wait for complete recv or error */
   #define MSG_DUPCTRL     0x800           /* Save control message for use with */
                                           /* with left over data */
   /* End of XPGv2 compliance */
   #define MSG_DONTWAIT    0x80            /* Don't block for this recv */
   #define MSG_NOTIFICATION 0x100          /* Notification, not data */
   #define MSG_XPG4_2      0x8000          /* Private: XPG4.2 flag */
   
   #define MSG_MAXIOVLEN   16
   
   #ifdef _KERNEL
   
   /*
    * for kernel socket only
    */
   #define MSG_MBLK_QUICKRELE      0x10000000      /* free mblk chain */
                                                   /* in timely manner */
   #define MSG_USERSPACE           0x20000000      /* buffer from user space */
   
   #endif /* _KERNEL */
   
   
   /* Added for XPGv2 compliance */
   #define SHUT_RD         0
   #define SHUT_WR         1
   #define SHUT_RDWR       2
   
   struct cmsghdr {
           socklen_t       cmsg_len;       /* data byte count, including hdr */
           int             cmsg_level;     /* originating protocol */
           int             cmsg_type;      /* protocol-specific type */
   };
   
   #if defined(_XPG4_2) || defined(_KERNEL)
   #if defined(__sparc)
   /* To maintain backward compatibility, alignment needs to be 8 on sparc. */
   #define _CMSG_HDR_ALIGNMENT     8
   #else
   /* for __i386 (and other future architectures) */
   #define _CMSG_HDR_ALIGNMENT     4
   #endif  /* defined(__sparc) */
   #endif  /* defined(_XPG4_2) || defined(_KERNEL) */
   
   #if defined(_XPG4_2)
   /*
    * The cmsg headers (and macros dealing with them) were made available as
    * part of UNIX95 and hence need to be protected with a _XPG4_2 define.
    */
   #define _CMSG_DATA_ALIGNMENT    (sizeof (int))
   #define _CMSG_HDR_ALIGN(x)      (((uintptr_t)(x) + _CMSG_HDR_ALIGNMENT - 1) & \
                                       ~(_CMSG_HDR_ALIGNMENT - 1))
   #define _CMSG_DATA_ALIGN(x)     (((uintptr_t)(x) + _CMSG_DATA_ALIGNMENT - 1) & \
                                       ~(_CMSG_DATA_ALIGNMENT - 1))
   #define CMSG_DATA(c)                                                    \
           ((unsigned char *)_CMSG_DATA_ALIGN((struct cmsghdr *)(c) + 1))
   
   #define CMSG_FIRSTHDR(m)                                                \
           (((m)->msg_controllen < sizeof (struct cmsghdr)) ?              \
               (struct cmsghdr *)0 : (struct cmsghdr *)((m)->msg_control))
   
   #define CMSG_NXTHDR(m, c)                                               \
           (((c) == 0) ? CMSG_FIRSTHDR(m) :                        \
           ((((uintptr_t)_CMSG_HDR_ALIGN((char *)(c) +                     \
           ((struct cmsghdr *)(c))->cmsg_len) + sizeof (struct cmsghdr)) > \
           (((uintptr_t)((struct msghdr *)(m))->msg_control) +             \
           ((uintptr_t)((struct msghdr *)(m))->msg_controllen))) ?         \
           ((struct cmsghdr *)0) :                                         \
           ((struct cmsghdr *)_CMSG_HDR_ALIGN((char *)(c) +                \
               ((struct cmsghdr *)(c))->cmsg_len))))
   
   /* Amount of space + padding needed for a message of length l */
   #define CMSG_SPACE(l)                                                   \
           ((unsigned int)_CMSG_HDR_ALIGN(sizeof (struct cmsghdr) + (l)))
   
   /* Value to be used in cmsg_len, does not include trailing padding */
   #define CMSG_LEN(l)                                                     \
           ((unsigned int)_CMSG_DATA_ALIGN(sizeof (struct cmsghdr)) + (l))
   
   #endif  /* _XPG4_2 */
   
   #ifdef  _XPG4_2
   #ifdef  __PRAGMA_REDEFINE_EXTNAME
   #pragma redefine_extname bind __xnet_bind
   #pragma redefine_extname connect __xnet_connect
   #pragma redefine_extname recvmsg __xnet_recvmsg
   #pragma redefine_extname sendmsg __xnet_sendmsg
   #pragma redefine_extname sendto __xnet_sendto
   #pragma redefine_extname socket __xnet_socket
   #pragma redefine_extname socketpair __xnet_socketpair
   #pragma redefine_extname getsockopt __xnet_getsockopt
   #else   /* __PRAGMA_REDEFINE_EXTNAME */
   #define bind    __xnet_bind
   #define connect __xnet_connect
   #define recvmsg __xnet_recvmsg
   #define sendmsg __xnet_sendmsg
   #define sendto  __xnet_sendto
   #define socket  __xnet_socket
   #define socketpair      __xnet_socketpair
   #define getsockopt      __xnet_getsockopt
   #endif  /* __PRAGMA_REDEFINE_EXTNAME */
   
   #endif  /* _XPG4_2 */
   
   #if defined(_XPG4_2) && !defined(_XPG5)
   #ifdef  __PRAGMA_REDEFINE_EXTNAME
   #pragma redefine_extname listen __xnet_listen
   #else   /* __PRAGMA_REDEFINE_EXTNAME */
   #define listen  __xnet_listen
   #endif  /* __PRAGMA_REDEFINE_EXTNAME */
   #endif /* (_XPG4_2) && !defined(_XPG5) */
   
   #if !defined(_KERNEL) || defined(_BOOT)
   #ifdef  __STDC__
   extern int accept(int, struct sockaddr *_RESTRICT_KYWD, Psocklen_t);
   extern int bind(int, const struct sockaddr *, socklen_t);
   extern int connect(int, const struct sockaddr *, socklen_t);
   extern int getpeername(int, struct sockaddr *_RESTRICT_KYWD, Psocklen_t);
   extern int getsockname(int, struct sockaddr *_RESTRICT_KYWD, Psocklen_t);
   extern int getsockopt(int, int, int, void *_RESTRICT_KYWD, Psocklen_t);
   extern int listen(int, int);    /* XXX - fixme???  where do I go */
   extern int socketpair(int, int, int, int *);
   extern ssize_t recv(int, void *, size_t, int);
   extern ssize_t recvfrom(int, void *_RESTRICT_KYWD, size_t, int,
           struct sockaddr *_RESTRICT_KYWD, Psocklen_t);
   extern ssize_t recvmsg(int, struct msghdr *, int);
   extern ssize_t send(int, const void *, size_t, int);
   extern ssize_t sendmsg(int, const struct msghdr *, int);
   extern ssize_t sendto(int, const void *, size_t, int, const struct sockaddr *,
           socklen_t);
   extern int setsockopt(int, int, int, const void *, socklen_t);
   extern int shutdown(int, int);
   extern int socket(int, int, int);
   
   #if !defined(_XPG4_2) || defined(_XPG6) || defined(__EXTENSIONS__)
   extern int sockatmark(int);
   #endif /* !defined(_XPG4_2) || defined(_XPG6) || defined(__EXTENSIONS__) */
   #else   /* __STDC__ */
   extern int accept();
   extern int bind();
   extern int connect();
   extern int getpeername();
   extern int getsockname();
   extern int getsockopt();
   extern int listen();
   extern int recv();
   extern int recvfrom();
   extern int send();
   extern int sendto();
   extern int setsockopt();
   extern int sockatmark();
   extern int socket();
   extern int recvmsg();
   extern int sendmsg();
   extern int shutdown();
   extern int socketpair();
   #endif  /* __STDC__ */
   #endif  /* !defined(_KERNEL) || defined(_BOOT) */
   
   #ifdef  __cplusplus
   }
   #endif
   
   #endif  /* _SYS_SOCKET_H */

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