网络编程常见类型定义

/* Standard well-defined IP protocols.  */
enum
  {
    IPPROTO_IP = 0,       /* Dummy protocol for TCP.  */
#define IPPROTO_IP        IPPROTO_IP
    IPPROTO_HOPOPTS = 0,   /* IPv6 Hop-by-Hop options.  */
#define IPPROTO_HOPOPTS        IPPROTO_HOPOPTS
    IPPROTO_ICMP = 1,       /* Internet Control Message Protocol.  */
#define IPPROTO_ICMP        IPPROTO_ICMP
    IPPROTO_IGMP = 2,       /* Internet Group Management Protocol. */
#define IPPROTO_IGMP        IPPROTO_IGMP
    IPPROTO_IPIP = 4,       /* IPIP tunnels (older KA9Q tunnels use 94).  */
#define IPPROTO_IPIP        IPPROTO_IPIP
    IPPROTO_TCP = 6,       /* Transmission Control Protocol.  */
#define IPPROTO_TCP        IPPROTO_TCP
    IPPROTO_EGP = 8,       /* Exterior Gateway Protocol.  */
#define IPPROTO_EGP        IPPROTO_EGP
    IPPROTO_PUP = 12,       /* PUP protocol.  */
#define IPPROTO_PUP        IPPROTO_PUP
    IPPROTO_UDP = 17,       /* User Datagram Protocol.  */
#define IPPROTO_UDP        IPPROTO_UDP
    IPPROTO_IDP = 22,       /* XNS IDP protocol.  */
#define IPPROTO_IDP        IPPROTO_IDP
    IPPROTO_TP = 29,       /* SO Transport Protocol Class 4.  */
#define IPPROTO_TP        IPPROTO_TP
    IPPROTO_DCCP = 33,       /* Datagram Congestion Control Protocol.  */
#define IPPROTO_DCCP        IPPROTO_DCCP
    IPPROTO_IPV6 = 41,     /* IPv6 header.  */
#define IPPROTO_IPV6        IPPROTO_IPV6
    IPPROTO_ROUTING = 43,  /* IPv6 routing header.  */
#define IPPROTO_ROUTING        IPPROTO_ROUTING
    IPPROTO_FRAGMENT = 44, /* IPv6 fragmentation header.  */
#define IPPROTO_FRAGMENT    IPPROTO_FRAGMENT
    IPPROTO_RSVP = 46,       /* Reservation Protocol.  */
#define IPPROTO_RSVP        IPPROTO_RSVP
    IPPROTO_GRE = 47,       /* General Routing Encapsulation.  */
#define IPPROTO_GRE        IPPROTO_GRE
    IPPROTO_ESP = 50,      /* encapsulating security payload.  */
#define IPPROTO_ESP        IPPROTO_ESP
    IPPROTO_AH = 51,       /* authentication header.  */
#define IPPROTO_AH        IPPROTO_AH
    IPPROTO_ICMPV6 = 58,   /* ICMPv6.  */
#define IPPROTO_ICMPV6        IPPROTO_ICMPV6
    IPPROTO_NONE = 59,     /* IPv6 no next header.  */
#define IPPROTO_NONE        IPPROTO_NONE
    IPPROTO_DSTOPTS = 60,  /* IPv6 destination options.  */
#define IPPROTO_DSTOPTS        IPPROTO_DSTOPTS
    IPPROTO_MTP = 92,       /* Multicast Transport Protocol.  */
#define IPPROTO_MTP        IPPROTO_MTP
    IPPROTO_ENCAP = 98,       /* Encapsulation Header.  */
#define IPPROTO_ENCAP        IPPROTO_ENCAP
    IPPROTO_PIM = 103,       /* Protocol Independent Multicast.  */
#define IPPROTO_PIM        IPPROTO_PIM
    IPPROTO_COMP = 108,       /* Compression Header Protocol.  */
#define IPPROTO_COMP        IPPROTO_COMP
    IPPROTO_SCTP = 132,       /* Stream Control Transmission Protocol.  */
#define IPPROTO_SCTP        IPPROTO_SCTP
    IPPROTO_UDPLITE = 136, /* UDP-Lite protocol.  */
#define IPPROTO_UDPLITE        IPPROTO_UDPLITE
    IPPROTO_RAW = 255,       /* Raw IP packets.  */
#define IPPROTO_RAW        IPPROTO_RAW
    IPPROTO_MAX
  };


/* Type to represent a port.  */
typedef uint16_t in_port_t;

/* Standard well-known ports.  */
enum
  {
    IPPORT_ECHO = 7,        /* Echo service.  */
    IPPORT_DISCARD = 9,        /* Discard transmissions service.  */
    IPPORT_SYSTAT = 11,        /* System status service.  */
    IPPORT_DAYTIME = 13,    /* Time of day service.  */
    IPPORT_NETSTAT = 15,    /* Network status service.  */
    IPPORT_FTP = 21,        /* File Transfer Protocol.  */
    IPPORT_TELNET = 23,        /* Telnet protocol.  */
    IPPORT_SMTP = 25,        /* Simple Mail Transfer Protocol.  */
    IPPORT_TIMESERVER = 37,    /* Timeserver service.  */
    IPPORT_NAMESERVER = 42,    /* Domain Name Service.  */
    IPPORT_WHOIS = 43,        /* Internet Whois service.  */
    IPPORT_MTP = 57,

    IPPORT_TFTP = 69,        /* Trivial File Transfer Protocol.  */
    IPPORT_RJE = 77,
    IPPORT_FINGER = 79,        /* Finger service.  */
    IPPORT_TTYLINK = 87,
    IPPORT_SUPDUP = 95,        /* SUPDUP protocol.  */


    IPPORT_EXECSERVER = 512,    /* execd service.  */
    IPPORT_LOGINSERVER = 513,    /* rlogind service.  */
    IPPORT_CMDSERVER = 514,
    IPPORT_EFSSERVER = 520,

    /* UDP ports.  */
    IPPORT_BIFFUDP = 512,
    IPPORT_WHOSERVER = 513,
    IPPORT_ROUTESERVER = 520,

    /* Ports less than this value are reserved for privileged processes.  */
    IPPORT_RESERVED = 1024,

    /* Ports greater this value are reserved for (non-privileged) servers.  */
    IPPORT_USERRESERVED = 5000
  };


/* Internet address.  */
typedef uint32_t in_addr_t;
struct in_addr
{
    in_addr_t s_addr;
};


/* Definitions of the bits in an Internet address integer.

   On subnets, host and network parts are found according to
   the subnet mask, not these masks.  */

#define    IN_CLASSA(a)        ((((in_addr_t)(a)) & 0x80000000) == 0)
#define    IN_CLASSA_NET        0xff000000
#define    IN_CLASSA_NSHIFT    24
#define    IN_CLASSA_HOST        (0xffffffff & ~IN_CLASSA_NET)
#define    IN_CLASSA_MAX        128

#define    IN_CLASSB(a)        ((((in_addr_t)(a)) & 0xc0000000) == 0x80000000)
#define    IN_CLASSB_NET        0xffff0000
#define    IN_CLASSB_NSHIFT    16
#define    IN_CLASSB_HOST        (0xffffffff & ~IN_CLASSB_NET)
#define    IN_CLASSB_MAX        65536

#define    IN_CLASSC(a)        ((((in_addr_t)(a)) & 0xe0000000) == 0xc0000000)
#define    IN_CLASSC_NET        0xffffff00
#define    IN_CLASSC_NSHIFT    8
#define    IN_CLASSC_HOST        (0xffffffff & ~IN_CLASSC_NET)

#define    IN_CLASSD(a)        ((((in_addr_t)(a)) & 0xf0000000) == 0xe0000000)
#define    IN_MULTICAST(a)        IN_CLASSD(a)

#define    IN_EXPERIMENTAL(a)    ((((in_addr_t)(a)) & 0xe0000000) == 0xe0000000)
#define    IN_BADCLASS(a)        ((((in_addr_t)(a)) & 0xf0000000) == 0xf0000000)

/* Address to accept any incoming messages.  */
#define    INADDR_ANY        ((in_addr_t) 0x00000000)
/* Address to send to all hosts.  */
#define    INADDR_BROADCAST    ((in_addr_t) 0xffffffff)
/* Address indicating an error return.  */
#define    INADDR_NONE        ((in_addr_t) 0xffffffff)

/* Network number for local host loopback.  */
#define    IN_LOOPBACKNET        127
/* Address to loopback in software to local host.  */
#ifndef INADDR_LOOPBACK
# define INADDR_LOOPBACK    ((in_addr_t) 0x7f000001) /* Inet 127.0.0.1.  */
#endif

/* Defines for Multicast INADDR.  */
#define INADDR_UNSPEC_GROUP    ((in_addr_t) 0xe0000000) /* 224.0.0.0 */
#define INADDR_ALLHOSTS_GROUP    ((in_addr_t) 0xe0000001) /* 224.0.0.1 */
#define INADDR_ALLRTRS_GROUP    ((in_addr_t) 0xe0000002) /* 224.0.0.2 */
#define INADDR_MAX_LOCAL_GROUP  ((in_addr_t) 0xe00000ff) /* 224.0.0.255 */


#if defined __UCLIBC_HAS_IPV6__ || !defined __UCLIBC_STRICT_HEADERS__
/* IPv6 address */
struct in6_addr
  {
    union
      {
    uint8_t    __u6_addr8[16];
#if defined __USE_MISC || defined __USE_GNU
    uint16_t __u6_addr16[8];
    uint32_t __u6_addr32[4];
#endif
      } __in6_u;
#define s6_addr            __in6_u.__u6_addr8
#if defined __USE_MISC || defined __USE_GNU
# define s6_addr16        __in6_u.__u6_addr16
# define s6_addr32        __in6_u.__u6_addr32
#endif
  };

#define IN6ADDR_ANY_INIT { { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 } } }
#define IN6ADDR_LOOPBACK_INIT { { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 } } }

#define INET6_ADDRSTRLEN 46
#endif

#ifdef __UCLIBC_HAS_IPV6__
extern const struct in6_addr in6addr_any;        /* :: */
extern const struct in6_addr in6addr_loopback;   /* ::1 */
libc_hidden_proto(in6addr_loopback)
#endif

#define INET_ADDRSTRLEN 16


#if 1 /*def __UCLIBC_HAS_IPV4__*/
/* Structure describing an Internet socket address.  */
struct sockaddr_in
  {
    __SOCKADDR_COMMON (sin_);
    in_port_t sin_port;            /* Port number.  */
    struct in_addr sin_addr;        /* Internet address.  */

    /* Pad to size of `struct sockaddr‘.  */
    unsigned char sin_zero[sizeof (struct sockaddr) -
               __SOCKADDR_COMMON_SIZE -
               sizeof (in_port_t) -
               sizeof (struct in_addr)];
  };
#endif

#if defined __UCLIBC_HAS_IPV6__ || !defined __UCLIBC_STRICT_HEADERS__
/* Ditto, for IPv6.  */
struct sockaddr_in6
  {
    __SOCKADDR_COMMON (sin6_);
    in_port_t sin6_port;    /* Transport layer port # */
    uint32_t sin6_flowinfo;    /* IPv6 flow information */
    struct in6_addr sin6_addr;    /* IPv6 address */
    uint32_t sin6_scope_id;    /* IPv6 scope-id */
  };
#endif


#if defined __USE_MISC || defined __USE_GNU
/* IPv4 multicast request.  */
struct ip_mreq
  {
    /* IP multicast address of group.  */
    struct in_addr imr_multiaddr;

    /* Local IP address of interface.  */
    struct in_addr imr_interface;
  };

struct ip_mreq_source
  {
    /* IP multicast address of group.  */
    struct in_addr imr_multiaddr;

    /* IP address of source.  */
    struct in_addr imr_interface;

    /* IP address of interface.  */
    struct in_addr imr_sourceaddr;
  };
#endif


#if defined __UCLIBC_HAS_IPV6__ || !defined __UCLIBC_STRICT_HEADERS__
/* Likewise, for IPv6.  */
struct ipv6_mreq
  {
    /* IPv6 multicast address of group */
    struct in6_addr ipv6mr_multiaddr;

    /* local interface */
    unsigned int ipv6mr_interface;
  };
#endif


#if defined __USE_MISC || defined __USE_GNU
/* Multicast group request.  */
struct group_req
  {
    /* Interface index.  */
    uint32_t gr_interface;

    /* Group address.  */
    struct sockaddr_storage gr_group;
  };

struct group_source_req
  {
    /* Interface index.  */
    uint32_t gsr_interface;

    /* Group address.  */
    struct sockaddr_storage gsr_group;

    /* Source address.  */
    struct sockaddr_storage gsr_source;
  };


/* Full-state filter operations.  */
struct ip_msfilter
  {
    /* IP multicast address of group.  */
    struct in_addr imsf_multiaddr;

    /* Local IP address of interface.  */
    struct in_addr imsf_interface;

    /* Filter mode.  */
    uint32_t imsf_fmode;

    /* Number of source addresses.  */
    uint32_t imsf_numsrc;
    /* Source addresses.  */
    struct in_addr imsf_slist[1];
  };

#define IP_MSFILTER_SIZE(numsrc) (sizeof (struct ip_msfilter)                   - sizeof (struct in_addr)                                + (numsrc) * sizeof (struct in_addr))

struct group_filter
  {
    /* Interface index.  */
    uint32_t gf_interface;

    /* Group address.  */
    struct sockaddr_storage gf_group;

    /* Filter mode.  */
    uint32_t gf_fmode;

    /* Number of source addresses.  */
    uint32_t gf_numsrc;
    /* Source addresses.  */
    struct sockaddr_storage gf_slist[1];
};

/* System-specific socket constants and types.  Linux version.
   Copyright (C) 1991,1992,1994-2001,2004,2006 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#ifndef __BITS_SOCKET_H
#define __BITS_SOCKET_H

#if !defined _SYS_SOCKET_H && !defined _NETINET_IN_H
# error "Never include <bits/socket.h> directly; use <sys/socket.h> instead."
#endif

#define    __need_size_t
#define __need_NULL
#include <stddef.h>

#include <limits.h>
#include <sys/types.h>

/* Type for length arguments in socket calls.  */
#ifndef __socklen_t_defined
typedef __socklen_t socklen_t;
# define __socklen_t_defined
#endif

/* Types of sockets.  */
enum __socket_type
{
  SOCK_STREAM = 1,        /* Sequenced, reliable, connection-based
                   byte streams.  */
#define SOCK_STREAM SOCK_STREAM
  SOCK_DGRAM = 2,        /* Connectionless, unreliable datagrams
                   of fixed maximum length.  */
#define SOCK_DGRAM SOCK_DGRAM
  SOCK_RAW = 3,            /* Raw protocol interface.  */
#define SOCK_RAW SOCK_RAW
  SOCK_RDM = 4,            /* Reliably-delivered messages.  */
#define SOCK_RDM SOCK_RDM
  SOCK_SEQPACKET = 5,        /* Sequenced, reliable, connection-based,
                   datagrams of fixed maximum length.  */
#define SOCK_SEQPACKET SOCK_SEQPACKET
  SOCK_PACKET = 10,        /* Linux specific way of getting packets
                   at the dev level.  For writing rarp and
                   other similar things on the user level. */
#define SOCK_PACKET SOCK_PACKET

  /* Flags to be ORed into the type parameter of socket and socketpair and
     used for the flags parameter of paccept.  */

  SOCK_CLOEXEC = 02000000,    /* Atomically set close-on-exec flag for the
                   new descriptor(s).  */
#define SOCK_CLOEXEC SOCK_CLOEXEC
  SOCK_NONBLOCK = 04000        /* Atomically mark descriptor(s) as
                   non-blocking.  */
#define SOCK_NONBLOCK SOCK_NONBLOCK
};

/* Protocol families.  */
#define    PF_UNSPEC    0    /* Unspecified.  */
#define    PF_LOCAL    1    /* Local to host (pipes and file-domain).  */
#define    PF_UNIX        PF_LOCAL /* Old BSD name for PF_LOCAL.  */
#define    PF_FILE        PF_LOCAL /* Another non-standard name for PF_LOCAL.  */
#define    PF_INET        2    /* IP protocol family.  */
#define    PF_AX25        3    /* Amateur Radio AX.25.  */
#define    PF_IPX        4    /* Novell Internet Protocol.  */
#define    PF_APPLETALK    5    /* Appletalk DDP.  */
#define    PF_NETROM    6    /* Amateur radio NetROM.  */
#define    PF_BRIDGE    7    /* Multiprotocol bridge.  */
#define    PF_ATMPVC    8    /* ATM PVCs.  */
#define    PF_X25        9    /* Reserved for X.25 project.  */
#define    PF_INET6    10    /* IP version 6.  */
#define    PF_ROSE        11    /* Amateur Radio X.25 PLP.  */
#define    PF_DECnet    12    /* Reserved for DECnet project.  */
#define    PF_NETBEUI    13    /* Reserved for 802.2LLC project.  */
#define    PF_SECURITY    14    /* Security callback pseudo AF.  */
#define    PF_KEY        15    /* PF_KEY key management API.  */
#define    PF_NETLINK    16
#define    PF_ROUTE    PF_NETLINK /* Alias to emulate 4.4BSD.  */
#define    PF_PACKET    17    /* Packet family.  */
#define    PF_ASH        18    /* Ash.  */
#define    PF_ECONET    19    /* Acorn Econet.  */
#define    PF_ATMSVC    20    /* ATM SVCs.  */
#define    PF_SNA        22    /* Linux SNA Project */
#define    PF_IRDA        23    /* IRDA sockets.  */
#define    PF_PPPOX    24    /* PPPoX sockets.  */
#define    PF_WANPIPE    25    /* Wanpipe API sockets.  */
#define    PF_LLC        26    /* Linux LLC.  */
#define    PF_CAN        29    /* Controller Area Network.  */
#define    PF_TIPC        30    /* TIPC sockets.  */
#define    PF_BLUETOOTH    31    /* Bluetooth sockets.  */
#define    PF_IUCV        32    /* IUCV sockets.  */
#define    PF_RXRPC    33    /* RxRPC sockets.  */
#define    PF_ISDN        34    /* mISDN sockets.  */
#define    PF_PHONET    35    /* Phonet sockets.  */
#define    PF_IEEE802154    36    /* IEEE 802.15.4 sockets.  */
#define    PF_CAIF        37    /* CAIF sockets.  */
#define    PF_ALG        38    /* Algorithm sockets.  */
#define    PF_MAX        39    /* For now..  */

/* Address families.  */
#define    AF_UNSPEC    PF_UNSPEC
#define    AF_LOCAL    PF_LOCAL
#define    AF_UNIX        PF_UNIX
#define    AF_FILE        PF_FILE
#define    AF_INET        PF_INET
#define    AF_AX25        PF_AX25
#define    AF_IPX        PF_IPX
#define    AF_APPLETALK    PF_APPLETALK
#define    AF_NETROM    PF_NETROM
#define    AF_BRIDGE    PF_BRIDGE
#define    AF_ATMPVC    PF_ATMPVC
#define    AF_X25        PF_X25
#define    AF_INET6    PF_INET6
#define    AF_ROSE        PF_ROSE
#define    AF_DECnet    PF_DECnet
#define    AF_NETBEUI    PF_NETBEUI
#define    AF_SECURITY    PF_SECURITY
#define    AF_KEY        PF_KEY
#define    AF_NETLINK    PF_NETLINK
#define    AF_ROUTE    PF_ROUTE
#define    AF_PACKET    PF_PACKET
#define    AF_ASH        PF_ASH
#define    AF_ECONET    PF_ECONET
#define    AF_ATMSVC    PF_ATMSVC
#define    AF_SNA        PF_SNA
#define    AF_IRDA        PF_IRDA
#define    AF_PPPOX    PF_PPPOX
#define    AF_WANPIPE    PF_WANPIPE
#define    AF_LLC        PF_LLC
#define    AF_CAN        PF_CAN
#define    AF_TIPC        PF_TIPC
#define    AF_BLUETOOTH    PF_BLUETOOTH
#define    AF_IUCV        PF_IUCV
#define    AF_RXRPC    PF_RXRPC
#define    AF_ISDN        PF_ISDN
#define    AF_PHONET    PF_PHONET
#define    AF_IEEE802154    PF_IEEE802154
#define    AF_CAIF        PF_CAIF
#define    AF_ALG        PF_ALG
#define    AF_MAX        PF_MAX

/* Socket level values.  Others are defined in the appropriate headers.

   XXX These definitions also should go into the appropriate headers as
   far as they are available.  */
#define SOL_RAW        255
#define SOL_DECNET      261
#define SOL_X25         262
#define SOL_PACKET    263
#define SOL_ATM        264    /* ATM layer (cell level).  */
#define SOL_AAL        265    /* ATM Adaption Layer (packet level).  */
#define SOL_IRDA    266

/* Maximum queue length specifiable by listen.  */
#define SOMAXCONN    128

/* Get the definition of the macro to define the common sockaddr members.  */
#include <bits/sockaddr.h>

/* Structure describing a generic socket address.  */
struct sockaddr
  {
    __SOCKADDR_COMMON (sa_);    /* Common data: address family and length.  */
    char sa_data[14];        /* Address data.  */
  };


/* Structure large enough to hold any socket address (with the historical
   exception of AF_UNIX).  We reserve 128 bytes.  */
#if ULONG_MAX > 0xffffffff
# define __ss_aligntype    __uint64_t
#else
# define __ss_aligntype    __uint32_t
#endif
#define _SS_SIZE    128
#define _SS_PADSIZE    (_SS_SIZE - (2 * sizeof (__ss_aligntype)))

struct sockaddr_storage
  {
    __SOCKADDR_COMMON (ss_);    /* Address family, etc.  */
    __ss_aligntype __ss_align;    /* Force desired alignment.  */
    char __ss_padding[_SS_PADSIZE];
  };


/* Bits in the FLAGS argument to `send‘, `recv‘, et al.  */
enum
  {
    MSG_OOB        = 0x01,    /* Process out-of-band data.  */
#define MSG_OOB        MSG_OOB
    MSG_PEEK        = 0x02,    /* Peek at incoming messages.  */
#define MSG_PEEK    MSG_PEEK
    MSG_DONTROUTE    = 0x04,    /* Don‘t use local routing.  */
#define MSG_DONTROUTE    MSG_DONTROUTE
#ifdef __USE_GNU
    /* DECnet uses a different name.  */
    MSG_TRYHARD        = MSG_DONTROUTE,
# define MSG_TRYHARD    MSG_DONTROUTE
#endif
    MSG_CTRUNC        = 0x08,    /* Control data lost before delivery.  */
#define MSG_CTRUNC    MSG_CTRUNC
    MSG_PROXY        = 0x10,    /* Supply or ask second address.  */
#define MSG_PROXY    MSG_PROXY
    MSG_TRUNC        = 0x20,
#define    MSG_TRUNC    MSG_TRUNC
    MSG_DONTWAIT    = 0x40, /* Nonblocking IO.  */
#define    MSG_DONTWAIT    MSG_DONTWAIT
    MSG_EOR        = 0x80, /* End of record.  */
#define    MSG_EOR        MSG_EOR
    MSG_WAITALL        = 0x100, /* Wait for a full request.  */
#define    MSG_WAITALL    MSG_WAITALL
    MSG_FIN        = 0x200,
#define    MSG_FIN        MSG_FIN
    MSG_SYN        = 0x400,
#define    MSG_SYN        MSG_SYN
    MSG_CONFIRM        = 0x800, /* Confirm path validity.  */
#define    MSG_CONFIRM    MSG_CONFIRM
    MSG_RST        = 0x1000,
#define    MSG_RST        MSG_RST
    MSG_ERRQUEUE    = 0x2000, /* Fetch message from error queue.  */
#define    MSG_ERRQUEUE    MSG_ERRQUEUE
    MSG_NOSIGNAL    = 0x4000, /* Do not generate SIGPIPE.  */
#define    MSG_NOSIGNAL    MSG_NOSIGNAL
    MSG_MORE        = 0x8000  /* Sender will send more.  */
#define    MSG_MORE    MSG_MORE
  };


/* Structure describing messages sent by
   `sendmsg‘ and received by `recvmsg‘.  */
/* Note: do not change these members to match glibc; these match the
   SuSv3 spec already (e.g. msg_iovlen/msg_controllen).
   http://www.opengroup.org/onlinepubs/009695399/basedefs/sys/socket.h.html */
/* Note: linux kernel uses __kernel_size_t (which is 8bytes on 64bit
   platforms, and 4bytes on 32bit platforms) for msg_iovlen/msg_controllen */
struct msghdr
  {
    void *msg_name;        /* Address to send to/receive from.  */
    socklen_t msg_namelen;    /* Length of address data.  */

    struct iovec *msg_iov;    /* Vector of data to send/receive into.  */
#if __WORDSIZE == 32
    int msg_iovlen;        /* Number of elements in the vector.  */
#else
    size_t msg_iovlen;        /* Number of elements in the vector.  */
#endif

    void *msg_control;        /* Ancillary data (eg BSD filedesc passing). */
#if __WORDSIZE == 32
    socklen_t msg_controllen;    /* Ancillary data buffer length.  */
#else
    size_t msg_controllen;    /* Ancillary data buffer length.  */
#endif

    int msg_flags;        /* Flags on received message.  */
  };

/* Structure used for storage of ancillary data object information.  */
struct cmsghdr
  {
    size_t cmsg_len;        /* Length of data in cmsg_data plus length
                   of cmsghdr structure.  */
    int cmsg_level;        /* Originating protocol.  */
    int cmsg_type;        /* Protocol specific type.  */
#if (!defined __STRICT_ANSI__ && __GNUC__ >= 2) || __STDC_VERSION__ >= 199901L
    __extension__ unsigned char __cmsg_data __flexarr; /* Ancillary data.  */
#endif
  };

/* Ancillary data object manipulation macros.  */
#if (!defined __STRICT_ANSI__ && __GNUC__ >= 2) || __STDC_VERSION__ >= 199901L
# define CMSG_DATA(cmsg) ((cmsg)->__cmsg_data)
#else
# define CMSG_DATA(cmsg) ((unsigned char *) ((struct cmsghdr *) (cmsg) + 1))
#endif
#define CMSG_NXTHDR(mhdr, cmsg) __cmsg_nxthdr (mhdr, cmsg)
#define CMSG_FIRSTHDR(mhdr) \
  ((size_t) (mhdr)->msg_controllen >= sizeof (struct cmsghdr)                 ? (struct cmsghdr *) (mhdr)->msg_control : (struct cmsghdr *) NULL)
#define CMSG_ALIGN(len) (((len) + sizeof (size_t) - 1)              & (size_t) ~(sizeof (size_t) - 1))
#define CMSG_SPACE(len) (CMSG_ALIGN (len)              + CMSG_ALIGN (sizeof (struct cmsghdr)))
#define CMSG_LEN(len)   (CMSG_ALIGN (sizeof (struct cmsghdr)) + (len))

extern struct cmsghdr *__cmsg_nxthdr (struct msghdr *__mhdr,
                      struct cmsghdr *__cmsg) __THROW;
libc_hidden_proto(__cmsg_nxthdr)
#ifdef __USE_EXTERN_INLINES
# ifndef _EXTERN_INLINE
#  define _EXTERN_INLINE extern __inline
# endif
_EXTERN_INLINE struct cmsghdr *
__NTH (__cmsg_nxthdr (struct msghdr *__mhdr, struct cmsghdr *__cmsg))
{
  if ((size_t) __cmsg->cmsg_len < sizeof (struct cmsghdr))
    /* The kernel header does this so there may be a reason.  */
    return 0;

  __cmsg = (struct cmsghdr *) ((unsigned char *) __cmsg
                   + CMSG_ALIGN (__cmsg->cmsg_len));
  if ((unsigned char *) (__cmsg + 1) > ((unsigned char *) __mhdr->msg_control
                    + __mhdr->msg_controllen)
      || ((unsigned char *) __cmsg + CMSG_ALIGN (__cmsg->cmsg_len)
      > ((unsigned char *) __mhdr->msg_control + __mhdr->msg_controllen)))
    /* No more entries.  */
    return 0;
  return __cmsg;
}
#endif    /* Use `extern inline‘.  */

/* Socket level message types.  This must match the definitions in
   <linux/socket.h>.  */
enum
  {
    SCM_RIGHTS = 0x01        /* Transfer file descriptors.  */
#define SCM_RIGHTS SCM_RIGHTS
#ifdef __USE_BSD
    , SCM_CREDENTIALS = 0x02    /* Credentials passing.  */
# define SCM_CREDENTIALS SCM_CREDENTIALS
#endif
  };

/* User visible structure for SCM_CREDENTIALS message */

struct ucred
{
  pid_t pid;            /* PID of sending process.  */
  uid_t uid;            /* UID of sending process.  */
  gid_t gid;            /* GID of sending process.  */
};

/* Get socket manipulation related informations from kernel headers.  */
#ifndef __GLIBC__
#define __GLIBC__ 2
#include <asm/socket.h>
#undef __GLIBC__
#else
#include <asm/socket.h>
#endif


/* Structure used to manipulate the SO_LINGER option.  */
struct linger
  {
    int l_onoff;        /* Nonzero to linger on close.  */
    int l_linger;        /* Time to linger.  */
  };

#endif    /* bits/socket.h */

#ifndef _BITS_SOCKADDR_H
#define _BITS_SOCKADDR_H    1


/* POSIX.1g specifies this type name for the `sa_family‘ member.  */
typedef unsigned short int sa_family_t;

/* This macro is used to declare the initial common members
   of the data types used for socket addresses, `struct sockaddr‘,
   `struct sockaddr_in‘, `struct sockaddr_un‘, etc.  */                                                                                                                                                      

#define __SOCKADDR_COMMON(sa_prefix) \
  sa_family_t sa_prefix##family
  
#define __SOCKADDR_COMMON_SIZE  (sizeof (unsigned short int))
    
#endif  /* bits/sockaddr.h */