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

     /*      $NetBSD: socket.h,v 1.131 2021/11/02 20:35:51 christos 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. 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_
    
    #include <sys/featuretest.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>
   #include <sys/sigtypes.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 */
   #define SOCK_CONN_DGRAM 6               /* connection-orientated datagram */
   #define SOCK_DCCP       SOCK_CONN_DGRAM
   
   #define SOCK_CLOEXEC    0x10000000      /* set close on exec on socket */
   #define SOCK_NONBLOCK   0x20000000      /* set non blocking i/o socket */
   #define SOCK_NOSIGPIPE  0x40000000      /* don't send sigpipe */
   #define SOCK_FLAGS_MASK 0xf0000000      /* flags mask */
   
   /*
    * 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 */
   /*      SO_OTIMESTAMP   0x0400          */
   #define SO_NOSIGPIPE    0x0800          /* no SIGPIPE from EPIPE */
   #define SO_ACCEPTFILTER 0x1000          /* there is an accept filter */
   #define SO_TIMESTAMP    0x2000          /* timestamp received dgram traffic */
   #define SO_RERROR       0x4000          /* Keep track of receive errors */
   
   /* Allowed default option flags */
   #define SO_DEFOPTS      (SO_DEBUG|SO_REUSEADDR|SO_KEEPALIVE|SO_DONTROUTE| \
       SO_BROADCAST|SO_USELOOPBACK|SO_LINGER|SO_OOBINLINE|SO_REUSEPORT| \
       SO_NOSIGPIPE|SO_TIMESTAMP|SO_RERROR)
   
   #define __SO_OPTION_BITS \
           "\2" \
           "\1SO_DEBUG" \
           "\2SO_ACCEPTCONN" \
           "\3SO_REUSEADDR" \
           "\4SO_KEEPALIVE" \
           "\5SO_DONTROUTE" \
           "\6SO_BROADCAST" \
           "\7SO_USELOOPBACK" \
           "\10SO_LINGER" \
           "\11SO_OOBINLINE" \
           "\12SO_REUSEPORT" \
           "\13SO_OTIMESTAMP" \
           "\14SO_NOSIGPIPE" \
           "\15SO_ACCEPTFILTER" \
           "\16SO_TIMESTAMP" \
           "\17SO_RERROR"
   
   /*
    * 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 */
   /* SO_OSNDTIMEO         0x1005 */
   /* SO_ORCVTIMEO         0x1006 */
   #define SO_ERROR        0x1007          /* get error status and clear */
   #define SO_TYPE         0x1008          /* get socket type */
   #define SO_OVERFLOWED   0x1009          /* datagrams: return packets dropped */
   
   #define SO_NOHEADER     0x100a          /* user supplies no header to kernel;
                                            * kernel removes header and supplies
                                            * payload
                                            */
   #define SO_SNDTIMEO     0x100b          /* send timeout */
   #define SO_RCVTIMEO     0x100c          /* receive timeout */
   /*
    * Structure used for manipulating linger option.
    */
   struct  linger {
           int     l_onoff;                /* option on/off */
           int     l_linger;               /* linger time in seconds */
   };
   
   struct  accept_filter_arg {
           char    af_name[16];
           char    af_arg[256-16];
   };
   
   /*
    * 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 */
   #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_OROUTE       17              /* Internal Routing Protocol */
   #define AF_LINK         18              /* Link layer interface */
   #if defined(_NETBSD_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(_NETBSD_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(_NETBSD_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(_NETBSD_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 */
   #endif
   #define AF_BLUETOOTH    31              /* Bluetooth: HCI, SCO, L2CAP, RFCOMM */
   #define AF_IEEE80211    32              /* IEEE80211 */
   #define AF_MPLS         33              /* MultiProtocol Label Switching */
   #define AF_ROUTE        34              /* Internal Routing Protocol */
   #define AF_CAN          35
   #define AF_ETHER        36
   #define AF_MAX          37
   
   /*
    * 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 */
   };
   
   /*
    * we make the entire struct at least UCHAR_MAX + 1 in size since existing
    * use of sockaddr_un permits a path up to 253 bytes + '\0'.
    * sizeof(sb_len) + sizeof(sb_family) + 253 + '\0'
    */
   #define _SB_DATASIZE    254
   struct sockaddr_big {
       union {
           struct {
               __uint8_t   sb_len;
               sa_family_t sb_family;
               char        sb_data[_SB_DATASIZE];
           };
           uint64_t dummy; /* solicit natural alignment */
       };
   };
   
   #endif /* _KERNEL */
   
   /*
    * 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)
   
   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];
   };
   
   #if defined(_NETBSD_SOURCE)
   #define sstosa(__ss)    ((struct sockaddr *)(__ss))
   #define sstocsa(__ss)   ((const struct sockaddr *)(__ss))
   #endif /* _NETBSD_SOURCE */
   
   /*
    * 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_OROUTE       AF_OROUTE
   #define PF_LINK         AF_LINK
   #if defined(_NETBSD_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(_NETBSD_SOURCE)
   #define PF_RTIP         pseudo_AF_RTIP  /* 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(_NETBSD_SOURCE)
   #define PF_KEY          pseudo_AF_KEY   /* like PF_ROUTE, only for key mgmt */
   #endif
   #define PF_BLUETOOTH    AF_BLUETOOTH
   #define PF_MPLS         AF_MPLS
   #define PF_ROUTE        AF_ROUTE
   #define PF_CAN          AF_CAN
   #define PF_ETHER        AF_ETHER
   
   #define PF_MAX          AF_MAX
   
   #if defined(_NETBSD_SOURCE)
   
   #ifndef pid_t
   typedef __pid_t         pid_t;          /* process id */
   #define pid_t           __pid_t
   #endif
   
   #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 {
           pid_t   sc_pid;                 /* process id */
           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.
    *
    * The (ngrps - 1) is to account for struct sockcred being defined with
    * already one group member. This code works correctly when ngroups == 0
    * because of unsigned arithmetic wrap-around.
    */
   #define SOCKCREDSIZE(ngrps) \
           (/*LINTED*/sizeof(struct sockcred) + (sizeof(gid_t) * ((ngrps) - 1)))
   #endif /* _NETBSD_SOURCE */
   
   
   #if defined(_NETBSD_SOURCE)
   /* Definition for CTL_NET PCB fetching sysctls */
   struct kinfo_pcb {
           __uint64_t      ki_pcbaddr;     /* PTR: pcb addr */
           __uint64_t      ki_ppcbaddr;    /* PTR: ppcb addr */
           __uint64_t      ki_sockaddr;    /* PTR: socket addr */
   
           __uint32_t      ki_family;      /* INT: protocol family */
           __uint32_t      ki_type;        /* INT: socket type */
           __uint32_t      ki_protocol;    /* INT: protocol */
           __uint32_t      ki_pflags;      /* INT: generic protocol flags */
   
           __uint32_t      ki_sostate;     /* INT: socket state */
           __uint32_t      ki_prstate;     /* INT: protocol state */
           __int32_t       ki_tstate;      /* INT: tcp state */
           __uint32_t      ki_tflags;      /* INT: tcp flags */
   
           __uint64_t      ki_rcvq;        /* U_LONG: receive queue len */
           __uint64_t      ki_sndq;        /* U_LONG: send queue len */
   
           union {
                   struct sockaddr _kis_src; /* STRUCT: local address */
                   char _kis_pad[256 + 8];         /* pad to max addr length */
           } ki_s;
           union {
                   struct sockaddr _kid_dst; /* STRUCT: remote address */
                   char _kid_pad[256 + 8];         /* pad to max addr length */
           } ki_d;
   
           __uint64_t      ki_inode;       /* INO_T: fake inode number */
           __uint64_t      ki_vnode;       /* PTR: if associated with file */
           __uint64_t      ki_conn;        /* PTR: control block of peer */
           __uint64_t      ki_refs;        /* PTR: referencing socket */
           __uint64_t      ki_nextref;     /* PTR: link in refs list */
   };
   
   #define ki_src ki_s._kis_src
   #define ki_dst ki_d._kid_dst
   #define ki_spad ki_s._kis_pad
   #define ki_dpad ki_d._kid_pad
   
   #define PCB_SLOP                20
   #define PCB_ALL                 0
   
   #endif /* _NETBSD_SOURCE */
   
   #if defined(_NETBSD_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_OOOIFLIST        3       /* old NET_RT_IFLIST (pre 1.5) */
   #define NET_RT_OOIFLIST         4       /* old NET_RT_IFLIST (pre-64bit time) */
   #define NET_RT_OIFLIST          5       /* old NET_RT_IFLIST (pre 8.0) */
   #define NET_RT_IFLIST           6       /* survey interface list */
   
   #endif /* _NETBSD_SOURCE */
   
   /*
    * Maximum queue length specifiable by listen(2).
    */
   #ifndef SOMAXCONN
   #define SOMAXCONN       128
   #endif
   
   #include <sys/cdefs.h>
   
   /*
    * 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         0x0001          /* process out-of-band data */
   #define MSG_PEEK        0x0002          /* peek at incoming message */
   #define MSG_DONTROUTE   0x0004          /* send without using routing tables */
   #define MSG_EOR         0x0008          /* data completes record */
   #define MSG_TRUNC       0x0010          /* data discarded before delivery */
   #define MSG_CTRUNC      0x0020          /* control data lost before delivery */
   #define MSG_WAITALL     0x0040          /* wait for full request or error */
   #define MSG_DONTWAIT    0x0080          /* this message should be nonblocking */
   #define MSG_BCAST       0x0100          /* this message was rcvd using link-level brdcst */
   #define MSG_MCAST       0x0200          /* this message was rcvd using link-level mcast */
   #define MSG_NOSIGNAL    0x0400          /* do not generate SIGPIPE on EOF */
   #if defined(_NETBSD_SOURCE)
   #define MSG_CMSG_CLOEXEC 0x0800         /* close on exec receiving fd */
   #define MSG_NBIO        0x1000          /* use non-blocking I/O */
   #define MSG_WAITFORONE  0x2000          /* recvmmsg() wait for one message */
   #define MSG_NOTIFICATION 0x4000         /* SCTP notification */
   
   struct mmsghdr {
           struct msghdr msg_hdr;
           unsigned int msg_len;
   };
   #endif
   
   /* Extra flags used internally only */
   #define MSG_USERFLAGS   0x0ffffff
   #define MSG_NAMEMBUF    0x1000000       /* msg_name is an mbuf */
   #define MSG_CONTROLMBUF 0x2000000       /* msg_control is an mbuf */
   #define MSG_IOVUSRSPACE 0x4000000       /* msg_iov is in user space */
   #define MSG_LENUSRSPACE 0x8000000       /* address length is in user space */
   
   /*
    * 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[]; */
   };
   
   /*
    * 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) + __ALIGNBYTES) & ~__ALIGNBYTES)
   
   #ifdef _KERNEL
   #define CMSG_ALIGN(n)   __CMSG_ALIGN(n)
   #endif
   
   #define __CMSG_ASIZE    __CMSG_ALIGN(sizeof(struct cmsghdr))
   #define __CMSG_MSGNEXT(cmsg) \
       (__CASTV(char *, cmsg) + __CMSG_ALIGN((cmsg)->cmsg_len))
   #define __CMSG_MSGEND(mhdr) \
       (__CASTV(char *, (mhdr)->msg_control) + (mhdr)->msg_controllen)
   
   /* given pointer to struct cmsghdr, return pointer to data */
   #define CMSG_DATA(cmsg) (__CASTV(u_char *, cmsg) + __CMSG_ASIZE)
   #define CCMSG_DATA(cmsg) (__CASTCV(const u_char *, cmsg) + __CMSG_ASIZE)
   
   /* given pointer to struct cmsghdr, return pointer to next cmsghdr */
   #define CMSG_NXTHDR(mhdr, cmsg) \
       __CASTV(struct cmsghdr *,  \
           __CMSG_MSGNEXT(cmsg) + __CMSG_ASIZE > __CMSG_MSGEND(mhdr) ? 0 : \
           __CMSG_MSGNEXT(cmsg))
   
   /*
    * RFC 2292 requires to check msg_controllen, in case that the kernel returns
    * an empty list for some reasons.
    */
   #define CMSG_FIRSTHDR(mhdr) \
       __CASTV(struct cmsghdr *, \
           (mhdr)->msg_controllen < sizeof(struct cmsghdr) ? 0 : \
           (mhdr)->msg_control)
   
   #define CMSG_SPACE(l)   (__CMSG_ASIZE + __CMSG_ALIGN(l))
   #define CMSG_LEN(l)     (__CMSG_ASIZE + (l))
   
   /* "Socket"-level control message types: */
   #define SCM_RIGHTS      0x01            /* access rights (array of int) */
   #if defined(_NETBSD_SOURCE)
   /*                      0x02               timestamp (struct timeval50) */
   /*                      0x04               credentials (struct sockcred70) */
   #define SCM_TIMESTAMP   0x08            /* timestamp (struct timeval) */
   #define SCM_CREDS       0x10            /* 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. */
   
   #ifdef  _KERNEL
   static __inline socklen_t
   sockaddr_getlen(const struct sockaddr *sa)
   {
           return sa->sa_len;
   }
   
   __BEGIN_DECLS
   socklen_t sockaddr_getsize_by_family(sa_family_t);
   struct sockaddr *sockaddr_copy(struct sockaddr *, socklen_t,
       const struct sockaddr *);
   struct sockaddr *sockaddr_externalize(struct sockaddr *, socklen_t,
       const struct sockaddr *);
   struct sockaddr *sockaddr_alloc(sa_family_t, socklen_t, int);
   const void *sockaddr_const_addr(const struct sockaddr *, socklen_t *);
   void *sockaddr_addr(struct sockaddr *, socklen_t *);
   const struct sockaddr *sockaddr_any(const struct sockaddr *);
   const struct sockaddr *sockaddr_any_by_family(sa_family_t);
   const void *sockaddr_anyaddr(const struct sockaddr *, socklen_t *);
   int sockaddr_cmp(const struct sockaddr *, const struct sockaddr *);
   struct sockaddr *sockaddr_dup(const struct sockaddr *, int);
   int sockaddr_format(const struct sockaddr *, char *, size_t);
   void sockaddr_free(struct sockaddr *);
   __END_DECLS
   #endif /* _KERNEL */
   
   #ifndef _KERNEL
   
   __BEGIN_DECLS
   int     accept(int, struct sockaddr * __restrict, socklen_t * __restrict);
   int     accept4(int, struct sockaddr * __restrict, socklen_t * __restrict, int);
   int     bind(int, const struct sockaddr *, socklen_t);
   int     connect(int, const struct sockaddr *, socklen_t);
   int     getpeername(int, struct sockaddr * __restrict, socklen_t * __restrict);
   int     getsockname(int, struct sockaddr * __restrict, socklen_t * __restrict);
   int     getsockopt(int, int, int, void *__restrict, socklen_t * __restrict);
   int     getsockopt2(int, int, int, void *__restrict, socklen_t * __restrict);
   int     listen(int, int);
   int     paccept(int, struct sockaddr * __restrict, socklen_t * __restrict,
           const sigset_t * __restrict, int);
   ssize_t recv(int, void *, size_t, int);
   ssize_t recvfrom(int, void *__restrict, size_t, int,
               struct sockaddr * __restrict, socklen_t * __restrict);
   ssize_t recvmsg(int, struct msghdr *, int);
   ssize_t send(int, const void *, size_t, int);
   ssize_t sendto(int, const void *,
               size_t, int, const struct sockaddr *, socklen_t);
   ssize_t sendmsg(int, const struct msghdr *, int);
   int     setsockopt(int, int, int, const void *, socklen_t);
   int     shutdown(int, int);
   int     sockatmark(int);
   int     socket(int, int, int)
   #if !defined(__LIBC12_SOURCE__) && !defined(_STANDALONE)
   __RENAME(__socket30)
   #endif
                                ;
   int     socketpair(int, int, int, int *);
   
   #if defined(_NETBSD_SOURCE)
   int     sendmmsg(int, struct mmsghdr *, unsigned int, unsigned int);
   struct timespec;
   int     recvmmsg(int, struct mmsghdr *, unsigned int, unsigned int,
       struct timespec *);
   #endif
   __END_DECLS
   #endif /* !_KERNEL */
   
   #endif /* !_SYS_SOCKET_H_ */

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