[bpt/guile.git] / libguile / socket.c

/* Copyright (C) 1996,1997,1998,2000,2001, 2002 Free Software Foundation, Inc.
 * 
 * This 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.
 *
 * This 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 this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */


\f

#if HAVE_CONFIG_H
#  include <config.h>
#endif

#include <errno.h>
#include <gmp.h>

#include "libguile/_scm.h"
#include "libguile/unif.h"
#include "libguile/feature.h"
#include "libguile/fports.h"
#include "libguile/strings.h"
#include "libguile/vectors.h"

#include "libguile/validate.h"
#include "libguile/socket.h"

#ifdef __MINGW32__
#include "win32-socket.h"
#endif

#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <sys/types.h>
#ifdef HAVE_WINSOCK2_H
#include <winsock2.h>
#else
#include <sys/socket.h>
#ifdef HAVE_UNIX_DOMAIN_SOCKETS
#include <sys/un.h>
#endif
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#endif

#if defined (HAVE_UNIX_DOMAIN_SOCKETS) && !defined (SUN_LEN)
#define SUN_LEN(ptr) ((size_t) (((struct sockaddr_un *) 0)->sun_path) \
                      + strlen ((ptr)->sun_path))
#endif

/* we are not currently using socklen_t.  it's not defined on all systems,
   so would need to be checked by configure.  in the meantime, plain
   int is the best alternative.  */

\f

SCM_DEFINE (scm_htons, "htons", 1, 0, 0, 
            (SCM value),
            "Convert a 16 bit quantity from host to network byte ordering.\n"
            "@var{value} is packed into 2 bytes, which are then converted\n"
            "and returned as a new integer.")
#define FUNC_NAME s_scm_htons
{
  unsigned short c_in;

  SCM_VALIDATE_INUM_COPY (1, value, c_in);
  if (c_in != SCM_INUM (value))
    SCM_OUT_OF_RANGE (1, value);

  return SCM_MAKINUM (htons (c_in));
}
#undef FUNC_NAME

SCM_DEFINE (scm_ntohs, "ntohs", 1, 0, 0, 
            (SCM value),
            "Convert a 16 bit quantity from network to host byte ordering.\n"
            "@var{value} is packed into 2 bytes, which are then converted\n"
            "and returned as a new integer.")
#define FUNC_NAME s_scm_ntohs
{
  unsigned short c_in;

  SCM_VALIDATE_INUM_COPY (1, value, c_in);
  if (c_in != SCM_INUM (value))
    SCM_OUT_OF_RANGE (1, value);

  return SCM_MAKINUM (ntohs (c_in));
}
#undef FUNC_NAME

SCM_DEFINE (scm_htonl, "htonl", 1, 0, 0, 
            (SCM value),
            "Convert a 32 bit quantity from host to network byte ordering.\n"
            "@var{value} is packed into 4 bytes, which are then converted\n"
            "and returned as a new integer.")
#define FUNC_NAME s_scm_htonl
{
  scm_t_uint32 c_in = SCM_NUM2ULONG (1, value);

  return scm_ulong2num (htonl (c_in));
}
#undef FUNC_NAME

SCM_DEFINE (scm_ntohl, "ntohl", 1, 0, 0, 
            (SCM value),
            "Convert a 32 bit quantity from network to host byte ordering.\n"
            "@var{value} is packed into 4 bytes, which are then converted\n"
            "and returned as a new integer.")
#define FUNC_NAME s_scm_ntohl
{
  scm_t_uint32 c_in = SCM_NUM2ULONG (1, value);

  return scm_ulong2num (ntohl (c_in));
}
#undef FUNC_NAME

#ifndef HAVE_INET_ATON
/* for our definition in inet_aton.c, not usually needed.  */
extern int inet_aton ();
#endif

SCM_DEFINE (scm_inet_aton, "inet-aton", 1, 0, 0, 
            (SCM address),
            "Convert an IPv4 Internet address from printable string\n"
            "(dotted decimal notation) to an integer.  E.g.,\n\n"
            "@lisp\n"
            "(inet-aton \"127.0.0.1\") @result{} 2130706433\n"
            "@end lisp")
#define FUNC_NAME s_scm_inet_aton
{
  struct in_addr soka;

  SCM_VALIDATE_STRING (1, address);
  if (inet_aton (SCM_STRING_CHARS (address), &soka) == 0)
    SCM_MISC_ERROR ("bad address", SCM_EOL);
  return scm_ulong2num (ntohl (soka.s_addr));
}
#undef FUNC_NAME


SCM_DEFINE (scm_inet_ntoa, "inet-ntoa", 1, 0, 0, 
            (SCM inetid),
            "Convert an IPv4 Internet address to a printable\n"
            "(dotted decimal notation) string.  E.g.,\n\n"
            "@lisp\n"
            "(inet-ntoa 2130706433) @result{} \"127.0.0.1\"\n"
            "@end lisp")
#define FUNC_NAME s_scm_inet_ntoa
{
  struct in_addr addr;
  char *s;
  SCM answer;
  addr.s_addr = htonl (SCM_NUM2ULONG (1, inetid));
  s = inet_ntoa (addr);
  answer = scm_mem2string (s, strlen (s));
  return answer;
}
#undef FUNC_NAME

#ifdef HAVE_INET_NETOF
SCM_DEFINE (scm_inet_netof, "inet-netof", 1, 0, 0, 
            (SCM address),
            "Return the network number part of the given IPv4\n"
            "Internet address.  E.g.,\n\n"
            "@lisp\n"
            "(inet-netof 2130706433) @result{} 127\n"
            "@end lisp")
#define FUNC_NAME s_scm_inet_netof
{
  struct in_addr addr;
  addr.s_addr = htonl (SCM_NUM2ULONG (1, address));
  return scm_ulong2num ((unsigned long) inet_netof (addr));
}
#undef FUNC_NAME
#endif

#ifdef HAVE_INET_LNAOF
SCM_DEFINE (scm_lnaof, "inet-lnaof", 1, 0, 0, 
            (SCM address),
            "Return the local-address-with-network part of the given\n"
            "IPv4 Internet address, using the obsolete class A/B/C system.\n"
            "E.g.,\n\n"
            "@lisp\n"
            "(inet-lnaof 2130706433) @result{} 1\n"
            "@end lisp")
#define FUNC_NAME s_scm_lnaof
{
  struct in_addr addr;
  addr.s_addr = htonl (SCM_NUM2ULONG (1, address));
  return scm_ulong2num ((unsigned long) inet_lnaof (addr));
}
#undef FUNC_NAME
#endif

#ifdef HAVE_INET_MAKEADDR
SCM_DEFINE (scm_inet_makeaddr, "inet-makeaddr", 2, 0, 0,
            (SCM net, SCM lna),
            "Make an IPv4 Internet address by combining the network number\n"
            "@var{net} with the local-address-within-network number\n"
            "@var{lna}.  E.g.,\n\n"
            "@lisp\n"
            "(inet-makeaddr 127 1) @result{} 2130706433\n"
            "@end lisp")
#define FUNC_NAME s_scm_inet_makeaddr
{
  struct in_addr addr;
  unsigned long netnum;
  unsigned long lnanum;

  netnum = SCM_NUM2ULONG (1, net);
  lnanum = SCM_NUM2ULONG (2, lna);
  addr = inet_makeaddr (netnum, lnanum);
  return scm_ulong2num (ntohl (addr.s_addr));
}
#undef FUNC_NAME
#endif

#ifdef HAVE_IPV6

/* flip a 128 bit IPv6 address between host and network order.  */
#ifdef WORDS_BIGENDIAN
#define FLIP_NET_HOST_128(addr)
#else
#define FLIP_NET_HOST_128(addr)\
{\
  int i;\
  \
  for (i = 0; i < 8; i++)\
    {\
      scm_t_uint8 c = (addr)[i];\
      \
      (addr)[i] = (addr)[15 - i];\
      (addr)[15 - i] = c;\
    }\
}
#endif

#ifdef WORDS_BIGENDIAN
#define FLIPCPY_NET_HOST_128(dest, src) memcpy (dest, src, 16)
#else
#define FLIPCPY_NET_HOST_128(dest, src) \
{ \
  const scm_t_uint8 *tmp_srcp = (src) + 15; \
  scm_t_uint8 *tmp_destp = (dest); \
  \
  do { \
    *tmp_destp++ = *tmp_srcp--; \
  } while (tmp_srcp != (src)); \
}
#endif


#if (SIZEOF_SCM_T_BITS * 8) > 128
#error "Assumption that scm_t_bits <= 128 bits has been violated."
#endif

#if (SIZEOF_UNSIGNED_LONG * 8) > 128
#error "Assumption that unsigned long <= 128 bits has been violated."
#endif

#if (SIZEOF_UNSIGNED_LONG_LONG * 8) > 128
#error "Assumption that unsigned long long <= 128 bits has been violated."
#endif

/* convert a 128 bit IPv6 address in network order to a host ordered
   SCM integer.  */
static SCM ipv6_net_to_num (const scm_t_uint8 *src)
{
  int i = 0;
  const scm_t_uint8 *ptr = src;
  int num_zero_bytes = 0;
  scm_t_uint8 addr[16];

  /* count leading zeros (since we know it's bigendian, they'll be first) */ 
  while (i < 16)
    {
      if (*ptr) break;
      num_zero_bytes++;
      i++;
    }

  if (SCM_SIZEOF_UNSIGNED_LONG_LONG != 0) /* compiler should optimize this */
    {
      if ((16 - num_zero_bytes) <= sizeof (unsigned long long))
        {
          /* it fits */
          unsigned long long x;
          
          FLIPCPY_NET_HOST_128(addr, src);
#ifdef WORDS_BIGENDIAN
          memcpy (&x, addr + (16 - sizeof (x)), sizeof (x));
#else
          memcpy (&x, addr, sizeof (x));
#endif
          return scm_ulong_long2num (x);
        }
    }
  else
    {
      if ((16 - num_zero_bytes) <= sizeof (unsigned long))
        {
          /* this is just so that we use INUM where possible.  */
          unsigned long x;

          FLIPCPY_NET_HOST_128(addr, src);          
#ifdef WORDS_BIGENDIAN
          memcpy (&x, addr + (16 - sizeof (x)), sizeof (x));
#else
          memcpy (&x, addr, sizeof (x));
#endif
          return scm_ulong2num (x);
        }
    }
  /* otherwise get the big hammer */
  {
    SCM result = scm_i_mkbig ();
    
    mpz_import (SCM_I_BIG_MPZ (result),
                1, /* chunk */
                1, /* big-endian chunk ordering */
                16, /* chunks are 16 bytes long */
                1, /* big-endian byte ordering */
                0, /* "nails" -- leading unused bits per chunk */
                src);
    return scm_i_normbig (result);
  }
}  

/* convert a host ordered SCM integer to a 128 bit IPv6 address in
   network order.  */
static void ipv6_num_to_net (SCM src, scm_t_uint8 *dst)
{
  /* This code presumes that src has already been checked for range. */
  if (SCM_INUMP (src))
    {
      scm_t_signed_bits n = SCM_INUM (src);
#ifdef WORDS_BIGENDIAN
      memset (dst, 0, 16 - sizeof (scm_t_signed_bits));
      memcpy (dst + (16 - sizeof (scm_t_signed_bits)),
              &n,
              sizeof (scm_t_signed_bits));
#else
      memset (dst + sizeof (scm_t_signed_bits),
              0,
              16 - sizeof (scm_t_signed_bits));
      /* FIXME: this pair of ops is kinda wasteful -- should rewrite as
         a single loop perhaps, similar to the handling of bignums. */
      memcpy (dst, &n, sizeof (scm_t_signed_bits));
      FLIP_NET_HOST_128 (dst);
#endif
    }
  else
    {
      /* Presumes src has already been checked for fit -- see above. */
      size_t count;
      memset (dst, 0, 16);
      mpz_export (dst,
                  &count,
                  1, /* big-endian chunk ordering */
                  16, /* chunks are 16 bytes long */
                  1, /* big-endian byte ordering */
                  0, /* "nails" -- leading unused bits per chunk */
                  SCM_I_BIG_MPZ (src));
      scm_remember_upto_here_1 (src);
    }
}

static int
bignum_in_ipv6_range_p (SCM address)
{
  int result;
  int sgn = mpz_sgn (SCM_I_BIG_MPZ (address));
  
  if (sgn < 0)
    result = 0;
  else
    {
      int size = mpz_sizeinbase (SCM_I_BIG_MPZ (address), 2);
      if (size > 128) result = 0;
      else result = 1;
    }
  scm_remember_upto_here_1 (address);
  return result;
}

/* check that an SCM variable contains an IPv6 integer address.  */
#define VALIDATE_INET6(which_arg, address)\
   if (SCM_INUMP (address))\
      SCM_ASSERT_RANGE (which_arg, address, SCM_INUM (address) >= 0);\
   else\
   {\
      SCM_VALIDATE_BIGINT (which_arg, address);\
      SCM_ASSERT_RANGE (which_arg, address, bignum_in_ipv6_range_p);\
   }

#ifdef HAVE_INET_PTON
SCM_DEFINE (scm_inet_pton, "inet-pton", 2, 0, 0,
            (SCM family, SCM address),
            "Convert a string containing a printable network address to\n"
            "an integer address.  Note that unlike the C version of this\n"
            "function,\n"
            "the result is an integer with normal host byte ordering.\n"
            "@var{family} can be @code{AF_INET} or @code{AF_INET6}.  E.g.,\n\n"
            "@lisp\n"
            "(inet-pton AF_INET \"127.0.0.1\") @result{} 2130706433\n"
            "(inet-pton AF_INET6 \"::1\") @result{} 1\n"
            "@end lisp")
#define FUNC_NAME s_scm_inet_pton
{
  int af;
  char *src;
  char dst[16];
  int rv;

  SCM_VALIDATE_INUM_COPY (1, family, af);
  SCM_ASSERT_RANGE (1, family, af == AF_INET || af == AF_INET6);
  SCM_VALIDATE_STRING_COPY (2, address, src);
  rv = inet_pton (af, src, dst);
  if (rv == -1)
    SCM_SYSERROR;
  else if (rv == 0)
    SCM_MISC_ERROR ("Bad address", SCM_EOL);
  if (af == AF_INET)
    return scm_ulong2num (ntohl (*(scm_t_uint32 *) dst));
  else
    return ipv6_net_to_num ((char *) dst);
}
#undef FUNC_NAME
#endif

#ifdef HAVE_INET_NTOP
SCM_DEFINE (scm_inet_ntop, "inet-ntop", 2, 0, 0,
            (SCM family, SCM address),
            "Convert a network address into a printable string.\n"
            "Note that unlike the C version of this function,\n"
            "the input is an integer with normal host byte ordering.\n"
            "@var{family} can be @code{AF_INET} or @code{AF_INET6}.  E.g.,\n\n"
            "@lisp\n"
            "(inet-ntop AF_INET 2130706433) @result{} \"127.0.0.1\"\n"
            "(inet-ntop AF_INET6 (- (expt 2 128) 1)) @result{}\n"
            "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff\n"
            "@end lisp")
#define FUNC_NAME s_scm_inet_ntop
{
  int af;
#ifdef INET6_ADDRSTRLEN
  char dst[INET6_ADDRSTRLEN];
#else
  char dst[46];
#endif
  char addr6[16];

  SCM_VALIDATE_INUM_COPY (1, family, af);
  SCM_ASSERT_RANGE (1, family, af == AF_INET || af == AF_INET6);
  if (af == AF_INET)
    *(scm_t_uint32 *) addr6 = htonl (SCM_NUM2ULONG (2, address));
  else
    {
      VALIDATE_INET6 (2, address);
      ipv6_num_to_net (address, addr6);
    }
  if (inet_ntop (af, &addr6, dst, sizeof dst) == NULL)
    SCM_SYSERROR;
  return scm_makfrom0str (dst);
}
#undef FUNC_NAME
#endif

#endif  /* HAVE_IPV6 */

SCM_SYMBOL (sym_socket, "socket");

#define SCM_SOCK_FD_TO_PORT(fd) scm_fdes_to_port (fd, "r+0", sym_socket)

SCM_DEFINE (scm_socket, "socket", 3, 0, 0,
            (SCM family, SCM style, SCM proto),
            "Return a new socket port of the type specified by @var{family},\n"
            "@var{style} and @var{proto}.  All three parameters are\n"
            "integers.  Supported values for @var{family} are\n"
            "@code{AF_UNIX}, @code{AF_INET} and @code{AF_INET6}.\n"
            "Typical values for @var{style} are @code{SOCK_STREAM},\n"
            "@code{SOCK_DGRAM} and @code{SOCK_RAW}.\n\n"
            "@var{proto} can be obtained from a protocol name using\n"
            "@code{getprotobyname}.  A value of zero specifies the default\n"
            "protocol, which is usually right.\n\n"
            "A single socket port cannot by used for communication until it\n"
            "has been connected to another socket.")
#define FUNC_NAME s_scm_socket
{
  int fd;

  SCM_VALIDATE_INUM (1, family);
  SCM_VALIDATE_INUM (2, style);
  SCM_VALIDATE_INUM (3, proto);
  fd = socket (SCM_INUM (family), SCM_INUM (style), SCM_INUM (proto));
  if (fd == -1)
    SCM_SYSERROR;
  return SCM_SOCK_FD_TO_PORT (fd);
}
#undef FUNC_NAME

#ifdef HAVE_SOCKETPAIR
SCM_DEFINE (scm_socketpair, "socketpair", 3, 0, 0,
            (SCM family, SCM style, SCM proto),
            "Return a pair of connected (but unnamed) socket ports of the\n"
            "type specified by @var{family}, @var{style} and @var{proto}.\n"
            "Many systems support only socket pairs of the @code{AF_UNIX}\n"
            "family.  Zero is likely to be the only meaningful value for\n"
            "@var{proto}.")
#define FUNC_NAME s_scm_socketpair
{
  int fam;
  int fd[2];

  SCM_VALIDATE_INUM (1, family);
  SCM_VALIDATE_INUM (2, style);
  SCM_VALIDATE_INUM (3, proto);

  fam = SCM_INUM (family);

  if (socketpair (fam, SCM_INUM (style), SCM_INUM (proto), fd) == -1)
    SCM_SYSERROR;

  return scm_cons (SCM_SOCK_FD_TO_PORT (fd[0]), SCM_SOCK_FD_TO_PORT (fd[1]));
}
#undef FUNC_NAME
#endif

SCM_DEFINE (scm_getsockopt, "getsockopt", 3, 0, 0,
            (SCM sock, SCM level, SCM optname),
            "Return the value of a particular socket option for the socket\n"
            "port @var{sock}.  @var{level} is an integer code for type of\n"
            "option being requested, e.g., @code{SOL_SOCKET} for\n"
            "socket-level options.  @var{optname} is an integer code for the\n"
            "option required and should be specified using one of the\n"
            "symbols @code{SO_DEBUG}, @code{SO_REUSEADDR} etc.\n\n"
            "The returned value is typically an integer but @code{SO_LINGER}\n"
            "returns a pair of integers.")
#define FUNC_NAME s_scm_getsockopt
{
  int fd;
  /* size of optval is the largest supported option.  */
#ifdef HAVE_STRUCT_LINGER
  char optval[sizeof (struct linger)];
  int optlen = sizeof (struct linger);
#else
  char optval[sizeof (size_t)];
  int optlen = sizeof (size_t);
#endif
  int ilevel;
  int ioptname;

  sock = SCM_COERCE_OUTPORT (sock);
  SCM_VALIDATE_OPFPORT (1, sock);
  SCM_VALIDATE_INUM_COPY (2, level, ilevel);
  SCM_VALIDATE_INUM_COPY (3, optname, ioptname);

  fd = SCM_FPORT_FDES (sock);
  if (getsockopt (fd, ilevel, ioptname, (void *) optval, &optlen) == -1)
    SCM_SYSERROR;

  if (ilevel == SOL_SOCKET)
    {
#ifdef SO_LINGER
      if (ioptname == SO_LINGER)
        {
#ifdef HAVE_STRUCT_LINGER
          struct linger *ling = (struct linger *) optval;

          return scm_cons (scm_long2num (ling->l_onoff),
                           scm_long2num (ling->l_linger));
#else
          return scm_cons (scm_long2num (*(int *) optval),
                           SCM_MAKINUM (0));
#endif
        }
      else
#endif
        if (0
#ifdef SO_SNDBUF
            || ioptname == SO_SNDBUF
#endif
#ifdef SO_RCVBUF
            || ioptname == SO_RCVBUF
#endif
            )
          {
            return scm_long2num (*(size_t *) optval);
          }
    }
  return scm_long2num (*(int *) optval);
}
#undef FUNC_NAME

SCM_DEFINE (scm_setsockopt, "setsockopt", 4, 0, 0,
            (SCM sock, SCM level, SCM optname, SCM value),
            "Set the value of a particular socket option for the socket\n"
            "port @var{sock}.  @var{level} is an integer code for type of option\n"
            "being set, e.g., @code{SOL_SOCKET} for socket-level options.\n"
            "@var{optname} is an\n"
            "integer code for the option to set and should be specified using one of\n"
            "the symbols @code{SO_DEBUG}, @code{SO_REUSEADDR} etc.\n"
            "@var{value} is the value to which the option should be set.  For\n"
            "most options this must be an integer, but for @code{SO_LINGER} it must\n"
            "be a pair.\n\n"
            "The return value is unspecified.")
#define FUNC_NAME s_scm_setsockopt
{
  int fd;
  int optlen = -1;
  /* size of optval is the largest supported option.  */
#ifdef HAVE_STRUCT_LINGER
  char optval[sizeof (struct linger)];
#else
  char optval[sizeof (size_t)];
#endif
  int ilevel, ioptname;

  sock = SCM_COERCE_OUTPORT (sock);

  SCM_VALIDATE_OPFPORT (1, sock);
  SCM_VALIDATE_INUM_COPY (2, level, ilevel);
  SCM_VALIDATE_INUM_COPY (3, optname, ioptname);

  fd = SCM_FPORT_FDES (sock);

  if (ilevel == SOL_SOCKET)
    {
#ifdef SO_LINGER
      if (ioptname == SO_LINGER)
        {
#ifdef HAVE_STRUCT_LINGER
          struct linger ling;
          long lv;

          SCM_ASSERT (SCM_CONSP (value), value, SCM_ARG4, FUNC_NAME);
          lv = SCM_NUM2LONG (4, SCM_CAR (value));
          ling.l_onoff = (int) lv;
          SCM_ASSERT_RANGE (SCM_ARG4, value, ling.l_onoff == lv);
          lv = SCM_NUM2LONG (4, SCM_CDR (value));
          ling.l_linger = (int) lv;
          SCM_ASSERT_RANGE (SCM_ARG4, value, ling.l_linger == lv);
          optlen = (int) sizeof (struct linger);
          memcpy (optval, (void *) &ling, optlen);
#else
          int ling;
          long lv;

          SCM_ASSERT (SCM_CONSP (value), value, SCM_ARG4, FUNC_NAME);
          /* timeout is ignored, but may as well validate it.  */
          lv = SCM_NUM2LONG (4, SCM_CDR (value));
          ling = (int) lv;
          SCM_ASSERT_RANGE (SCM_ARG4, value, ling == lv);
          lv = SCM_NUM2LONG (4, SCM_CAR (value));
          ling = (int) lv;
          SCM_ASSERT_RANGE (SCM_ARG4, value, ling == lv);
          optlen = (int) sizeof (int);
          (*(int *) optval) = ling;
#endif
        }
      else
#endif
        if (0
#ifdef SO_SNDBUF
            || ioptname == SO_SNDBUF
#endif
#ifdef SO_RCVBUF
            || ioptname == SO_RCVBUF
#endif
            )
          {
            long lv = SCM_NUM2LONG (4, value);

            optlen = (int) sizeof (size_t);
            (*(size_t *) optval) = (size_t) lv;
          }
    }
  if (optlen == -1)
    {
      /* Most options take an int.  */
      long lv = SCM_NUM2LONG (4, value);
      int val = (int) lv;

      SCM_ASSERT_RANGE (SCM_ARG4, value, val == lv);
      optlen = (int) sizeof (int);
      (*(int *) optval) = val;
    }
  if (setsockopt (fd, ilevel, ioptname, (void *) optval, optlen) == -1)
    SCM_SYSERROR;
  return SCM_UNSPECIFIED;
}
#undef FUNC_NAME

SCM_DEFINE (scm_shutdown, "shutdown", 2, 0, 0,
          (SCM sock, SCM how),
            "Sockets can be closed simply by using @code{close-port}. The\n"
            "@code{shutdown} procedure allows reception or transmission on a\n"
            "connection to be shut down individually, according to the parameter\n"
            "@var{how}:\n\n"
            "@table @asis\n"
            "@item 0\n"
            "Stop receiving data for this socket.  If further data arrives,  reject it.\n"
            "@item 1\n"
            "Stop trying to transmit data from this socket.  Discard any\n"
            "data waiting to be sent.  Stop looking for acknowledgement of\n"
            "data already sent; don't retransmit it if it is lost.\n"
            "@item 2\n"
            "Stop both reception and transmission.\n"
            "@end table\n\n"
            "The return value is unspecified.")
#define FUNC_NAME s_scm_shutdown
{
  int fd;
  sock = SCM_COERCE_OUTPORT (sock);
  SCM_VALIDATE_OPFPORT (1, sock);
  SCM_VALIDATE_INUM (2, how);
  SCM_ASSERT_RANGE(2, how,0 <= SCM_INUM (how) && 2 >= SCM_INUM (how));
  fd = SCM_FPORT_FDES (sock);
  if (shutdown (fd, SCM_INUM (how)) == -1)
    SCM_SYSERROR;
  return SCM_UNSPECIFIED;
}
#undef FUNC_NAME

/* convert fam/address/args into a sockaddr of the appropriate type.
   args is modified by removing the arguments actually used.
   which_arg and proc are used when reporting errors:
   which_arg is the position of address in the original argument list.
   proc is the name of the original procedure.
   size returns the size of the structure allocated.  */

static struct sockaddr *
scm_fill_sockaddr (int fam, SCM address, SCM *args, int which_arg,
                   const char *proc, int *size)
#define FUNC_NAME proc
{
  switch (fam)
    {
    case AF_INET:
      {
        struct sockaddr_in *soka;
        unsigned long addr;
        int port;

        SCM_VALIDATE_ULONG_COPY (which_arg, address, addr);
        SCM_VALIDATE_CONS (which_arg + 1, *args);
        SCM_VALIDATE_INUM_COPY (which_arg + 1, SCM_CAR (*args), port);
        *args = SCM_CDR (*args);
        soka = (struct sockaddr_in *) scm_malloc (sizeof (struct sockaddr_in));
        if (!soka)
          scm_memory_error (proc);
        /* 4.4BSD-style interface includes sin_len member and defines SIN_LEN,
           4.3BSD  does not.  */
#ifdef SIN_LEN
        soka->sin_len = sizeof (struct sockaddr_in);
#endif
        soka->sin_family = AF_INET;
        soka->sin_addr.s_addr = htonl (addr);
        soka->sin_port = htons (port);
        *size = sizeof (struct sockaddr_in);
        return (struct sockaddr *) soka;
      }
#ifdef HAVE_IPV6
    case AF_INET6:
      {
        /* see RFC2553.  */
        int port;
        struct sockaddr_in6 *soka;
        unsigned long flowinfo = 0;
        unsigned long scope_id = 0;

        VALIDATE_INET6 (which_arg, address);
        SCM_VALIDATE_CONS (which_arg + 1, *args);
        SCM_VALIDATE_INUM_COPY (which_arg + 1, SCM_CAR (*args), port);
        *args = SCM_CDR (*args);
        if (SCM_CONSP (*args))
          {
            SCM_VALIDATE_ULONG_COPY (which_arg + 2, SCM_CAR (*args), flowinfo);
            *args = SCM_CDR (*args);
            if (SCM_CONSP (*args))
              {
                SCM_VALIDATE_ULONG_COPY (which_arg + 3, SCM_CAR (*args),
                                         scope_id);
                *args = SCM_CDR (*args);
              }
          }
        soka = (struct sockaddr_in6 *) scm_malloc (sizeof (struct sockaddr_in6));
        if (!soka)
          scm_memory_error (proc);
#ifdef SIN_LEN6
        soka->sin6_len = sizeof (struct sockaddr_in6);
#endif
        soka->sin6_family = AF_INET6;
        ipv6_num_to_net (address, soka->sin6_addr.s6_addr);
        soka->sin6_port = htons (port);
        soka->sin6_flowinfo = flowinfo;
#ifdef HAVE_SIN6_SCOPE_ID
        soka->sin6_scope_id = scope_id;
#endif
        *size = sizeof (struct sockaddr_in6);
        return (struct sockaddr *) soka;
      }
#endif
#ifdef HAVE_UNIX_DOMAIN_SOCKETS
    case AF_UNIX:
      {
        struct sockaddr_un *soka;
        int addr_size;

        SCM_ASSERT (SCM_STRINGP (address), address, which_arg, proc);
        /* the static buffer size in sockaddr_un seems to be arbitrary
           and not necessarily a hard limit.  e.g., the glibc manual
           suggests it may be possible to declare it size 0.  let's
           ignore it.  if the O/S doesn't like the size it will cause
           connect/bind etc., to fail.  sun_path is always the last
           member of the structure.  */
        addr_size = sizeof (struct sockaddr_un)
          + max (0, SCM_STRING_LENGTH (address) + 1 - (sizeof soka->sun_path));
        soka = (struct sockaddr_un *) scm_malloc (addr_size);
        if (!soka)
          scm_memory_error (proc);
        memset (soka, 0, addr_size);  /* for sun_len: see sin_len above. */
        soka->sun_family = AF_UNIX;
        memcpy (soka->sun_path, SCM_STRING_CHARS (address),
                SCM_STRING_LENGTH (address));
        *size = SUN_LEN (soka);
        return (struct sockaddr *) soka;
      }
#endif
    default:
      scm_out_of_range (proc, SCM_MAKINUM (fam));
    }
}
#undef FUNC_NAME
  
SCM_DEFINE (scm_connect, "connect", 3, 0, 1,
            (SCM sock, SCM fam, SCM address, SCM args),
            "Initiate a connection from a socket using a specified address\n"
            "family to the address\n"
            "specified by @var{address} and possibly @var{args}.\n"
            "The format required for @var{address}\n"
            "and @var{args} depends on the family of the socket.\n\n"
            "For a socket of family @code{AF_UNIX},\n"
            "only @var{address} is specified and must be a string with the\n"
            "filename where the socket is to be created.\n\n"
            "For a socket of family @code{AF_INET},\n"
            "@var{address} must be an integer IPv4 host address and\n"
            "@var{args} must be a single integer port number.\n\n"
            "For a socket of family @code{AF_INET6},\n"
            "@var{address} must be an integer IPv6 host address and\n"
            "@var{args} may be up to three integers:\n"
            "port [flowinfo] [scope_id],\n"
            "where flowinfo and scope_id default to zero.\n\n"
            "The return value is unspecified.")
#define FUNC_NAME s_scm_connect
{
  int fd;
  struct sockaddr *soka;
  int size;

  sock = SCM_COERCE_OUTPORT (sock);
  SCM_VALIDATE_OPFPORT (1, sock);
  SCM_VALIDATE_INUM (2, fam);
  fd = SCM_FPORT_FDES (sock);
  soka = scm_fill_sockaddr (SCM_INUM (fam), address, &args, 3, FUNC_NAME,
                            &size);
  if (connect (fd, soka, size) == -1)
    {
      int save_errno = errno;
      
      free (soka);
      errno = save_errno;
      SCM_SYSERROR;
    }
  free (soka);
  return SCM_UNSPECIFIED;
}
#undef FUNC_NAME

SCM_DEFINE (scm_bind, "bind", 3, 0, 1,
            (SCM sock, SCM fam, SCM address, SCM args),
            "Assign an address to the socket port @var{sock}.\n"
            "Generally this only needs to be done for server sockets,\n"
            "so they know where to look for incoming connections.  A socket\n"
            "without an address will be assigned one automatically when it\n"
            "starts communicating.\n\n"
            "The format of @var{address} and @var{args} depends\n"
            "on the family of the socket.\n\n"
            "For a socket of family @code{AF_UNIX}, only @var{address}\n"
            "is specified and must be a string with the filename where\n"
            "the socket is to be created.\n\n"
            "For a socket of family @code{AF_INET}, @var{address}\n"
            "must be an integer IPv4 address and @var{args}\n"
            "must be a single integer port number.\n\n"
            "The values of the following variables can also be used for\n"
            "@var{address}:\n\n"
            "@defvar INADDR_ANY\n"
            "Allow connections from any address.\n"
            "@end defvar\n\n"
            "@defvar INADDR_LOOPBACK\n"
            "The address of the local host using the loopback device.\n"
            "@end defvar\n\n"
            "@defvar INADDR_BROADCAST\n"
            "The broadcast address on the local network.\n"
            "@end defvar\n\n"
            "@defvar INADDR_NONE\n"
            "No address.\n"
            "@end defvar\n\n"
            "For a socket of family @code{AF_INET6}, @var{address}\n"
            "must be an integer IPv6 address and @var{args}\n"
            "may be up to three integers:\n"
            "port [flowinfo] [scope_id],\n"
            "where flowinfo and scope_id default to zero.\n\n"
            "The return value is unspecified.")
#define FUNC_NAME s_scm_bind
{
  struct sockaddr *soka;
  int size;
  int fd;

  sock = SCM_COERCE_OUTPORT (sock);
  SCM_VALIDATE_OPFPORT (1, sock);
  SCM_VALIDATE_INUM (2, fam);
  soka = scm_fill_sockaddr (SCM_INUM (fam), address, &args, 3, FUNC_NAME,
                            &size);
  fd = SCM_FPORT_FDES (sock);
  if (bind (fd, soka, size) == -1)
  {
    int save_errno = errno;
      
    free (soka);
    errno = save_errno;
    SCM_SYSERROR;
  }
  free (soka);
  return SCM_UNSPECIFIED;
}
#undef FUNC_NAME

SCM_DEFINE (scm_listen, "listen", 2, 0, 0,
            (SCM sock, SCM backlog),
            "Enable @var{sock} to accept connection\n"
            "requests.  @var{backlog} is an integer specifying\n"
            "the maximum length of the queue for pending connections.\n"
            "If the queue fills, new clients will fail to connect until\n"
            "the server calls @code{accept} to accept a connection from\n"
            "the queue.\n\n"
            "The return value is unspecified.")
#define FUNC_NAME s_scm_listen
{
  int fd;
  sock = SCM_COERCE_OUTPORT (sock);
  SCM_VALIDATE_OPFPORT (1, sock);
  SCM_VALIDATE_INUM (2, backlog);
  fd = SCM_FPORT_FDES (sock);
  if (listen (fd, SCM_INUM (backlog)) == -1)
    SCM_SYSERROR;
  return SCM_UNSPECIFIED;
}
#undef FUNC_NAME

/* Put the components of a sockaddr into a new SCM vector.  */
static SCM
scm_addr_vector (const struct sockaddr *address, int addr_size, 
                 const char *proc)
{
  short int fam = address->sa_family;
  SCM result =SCM_EOL;


  switch (fam)
    {
    case AF_INET:
      {
        const struct sockaddr_in *nad = (struct sockaddr_in *) address;

        result = scm_c_make_vector (3, SCM_UNSPECIFIED);

        SCM_VECTOR_SET(result, 0, scm_ulong2num ((unsigned long) fam));
        SCM_VECTOR_SET(result, 1, scm_ulong2num (ntohl (nad->sin_addr.s_addr)));
        SCM_VECTOR_SET(result, 2, scm_ulong2num ((unsigned long) ntohs (nad->sin_port)));
      }
      break;
#ifdef HAVE_IPV6
    case AF_INET6:
      {
        const struct sockaddr_in6 *nad = (struct sockaddr_in6 *) address;

        result = scm_c_make_vector (5, SCM_UNSPECIFIED);
        SCM_VECTOR_SET(result, 0, scm_ulong2num ((unsigned long) fam));
        SCM_VECTOR_SET(result, 1, ipv6_net_to_num (nad->sin6_addr.s6_addr));
        SCM_VECTOR_SET(result, 2, scm_ulong2num ((unsigned long) ntohs (nad->sin6_port)));
        SCM_VECTOR_SET(result, 3, scm_ulong2num ((unsigned long) nad->sin6_flowinfo));
#ifdef HAVE_SIN6_SCOPE_ID
        SCM_VECTOR_SET(result, 4, scm_ulong2num ((unsigned long) nad->sin6_scope_id));
#else
        SCM_VECTOR_SET(result, 4, SCM_INUM0);
#endif
      }
      break;
#endif
#ifdef HAVE_UNIX_DOMAIN_SOCKETS
    case AF_UNIX:
      {
        const struct sockaddr_un *nad = (struct sockaddr_un *) address;

        result = scm_c_make_vector (2, SCM_UNSPECIFIED);

        SCM_VECTOR_SET(result, 0, scm_ulong2num ((unsigned long) fam));
        /* When addr_size is not enough to cover sun_path, do not try
           to access it. */
        if (addr_size <= offsetof (struct sockaddr_un, sun_path))
          SCM_VECTOR_SET(result, 1, SCM_BOOL_F);
        else
          SCM_VECTOR_SET(result, 1, scm_mem2string (nad->sun_path,
                                                    strlen (nad->sun_path)));
      }
      break;
#endif
    default:
      scm_misc_error (proc, "Unrecognised address family: ~A",
                      scm_list_1 (SCM_MAKINUM (fam)));
    }
  return result;
}

/* calculate the size of a buffer large enough to hold any supported
   sockaddr type.  if the buffer isn't large enough, certain system
   calls will return a truncated address.  */

#if defined (HAVE_UNIX_DOMAIN_SOCKETS)
#define MAX_SIZE_UN sizeof (struct sockaddr_un)
#else
#define MAX_SIZE_UN 0
#endif

#if defined (HAVE_IPV6)
#define MAX_SIZE_IN6 sizeof (struct sockaddr_in6)
#else
#define MAX_SIZE_IN6 0
#endif

#define MAX_ADDR_SIZE max (max (sizeof (struct sockaddr_in), MAX_SIZE_IN6),\
                           MAX_SIZE_UN)

SCM_DEFINE (scm_accept, "accept", 1, 0, 0, 
            (SCM sock),
            "Accept a connection on a bound, listening socket.\n"
            "If there\n"
            "are no pending connections in the queue, wait until\n"
            "one is available unless the non-blocking option has been\n"
            "set on the socket.\n\n"
            "The return value is a\n"
            "pair in which the @emph{car} is a new socket port for the\n"
            "connection and\n"
            "the @emph{cdr} is an object with address information about the\n"
            "client which initiated the connection.\n\n"
            "@var{sock} does not become part of the\n"
            "connection and will continue to accept new requests.")
#define FUNC_NAME s_scm_accept
{
  int fd;
  int newfd;
  SCM address;
  SCM newsock;
  int addr_size = MAX_ADDR_SIZE;
  char max_addr[MAX_ADDR_SIZE];
  struct sockaddr *addr = (struct sockaddr *) max_addr;

  sock = SCM_COERCE_OUTPORT (sock);
  SCM_VALIDATE_OPFPORT (1, sock);
  fd = SCM_FPORT_FDES (sock);
  newfd = accept (fd, addr, &addr_size);
  if (newfd == -1)
    SCM_SYSERROR;
  newsock = SCM_SOCK_FD_TO_PORT (newfd);
  address = scm_addr_vector (addr, addr_size, FUNC_NAME);
  return scm_cons (newsock, address);
}
#undef FUNC_NAME

SCM_DEFINE (scm_getsockname, "getsockname", 1, 0, 0, 
            (SCM sock),
            "Return the address of @var{sock}, in the same form as the\n"
            "object returned by @code{accept}.  On many systems the address\n"
            "of a socket in the @code{AF_FILE} namespace cannot be read.")
#define FUNC_NAME s_scm_getsockname
{
  int fd;
  int addr_size = MAX_ADDR_SIZE;
  char max_addr[MAX_ADDR_SIZE];
  struct sockaddr *addr = (struct sockaddr *) max_addr;

  sock = SCM_COERCE_OUTPORT (sock);
  SCM_VALIDATE_OPFPORT (1, sock);
  fd = SCM_FPORT_FDES (sock);
  if (getsockname (fd, addr, &addr_size) == -1)
    SCM_SYSERROR;
  return scm_addr_vector (addr, addr_size, FUNC_NAME);
}
#undef FUNC_NAME

SCM_DEFINE (scm_getpeername, "getpeername", 1, 0, 0, 
            (SCM sock),
            "Return the address that @var{sock}\n"
            "is connected to, in the same form as the object returned by\n"
            "@code{accept}.  On many systems the address of a socket in the\n"
            "@code{AF_FILE} namespace cannot be read.")
#define FUNC_NAME s_scm_getpeername
{
  int fd;
  int addr_size = MAX_ADDR_SIZE;
  char max_addr[MAX_ADDR_SIZE];
  struct sockaddr *addr = (struct sockaddr *) max_addr;

  sock = SCM_COERCE_OUTPORT (sock);
  SCM_VALIDATE_OPFPORT (1, sock);
  fd = SCM_FPORT_FDES (sock);
  if (getpeername (fd, addr, &addr_size) == -1)
    SCM_SYSERROR;
  return scm_addr_vector (addr, addr_size, FUNC_NAME);
}
#undef FUNC_NAME

SCM_DEFINE (scm_recv, "recv!", 2, 1, 0,
            (SCM sock, SCM buf, SCM flags),
            "Receive data from a socket port.\n"
            "@var{sock} must already\n"
            "be bound to the address from which data is to be received.\n"
            "@var{buf} is a string into which\n"
            "the data will be written.  The size of @var{buf} limits\n"
            "the amount of\n"
            "data which can be received: in the case of packet\n"
            "protocols, if a packet larger than this limit is encountered\n"
            "then some data\n"
            "will be irrevocably lost.\n\n"
            "The optional @var{flags} argument is a value or\n"
            "bitwise OR of MSG_OOB, MSG_PEEK, MSG_DONTROUTE etc.\n\n"
            "The value returned is the number of bytes read from the\n"
            "socket.\n\n"
            "Note that the data is read directly from the socket file\n"
            "descriptor:\n"
            "any unread buffered port data is ignored.")
#define FUNC_NAME s_scm_recv
{
  int rv;
  int fd;
  int flg;

  SCM_VALIDATE_OPFPORT (1, sock);
  SCM_VALIDATE_STRING (2, buf);
  SCM_VALIDATE_INUM_DEF_COPY (3, flags,0, flg);
  fd = SCM_FPORT_FDES (sock);

  SCM_SYSCALL (rv = recv (fd, SCM_STRING_CHARS (buf), SCM_STRING_LENGTH (buf), flg));
  if (rv == -1)
    SCM_SYSERROR;

  return SCM_MAKINUM (rv);
}
#undef FUNC_NAME

SCM_DEFINE (scm_send, "send", 2, 1, 0,
            (SCM sock, SCM message, SCM flags),
            "Transmit the string @var{message} on a socket port @var{sock}.\n"
            "@var{sock} must already be bound to a destination address.  The\n"
            "value returned is the number of bytes transmitted --\n"
            "it's possible for\n"
            "this to be less than the length of @var{message}\n"
            "if the socket is\n"
            "set to be non-blocking.  The optional @var{flags} argument\n"
            "is a value or\n"
            "bitwise OR of MSG_OOB, MSG_PEEK, MSG_DONTROUTE etc.\n\n"
            "Note that the data is written directly to the socket\n"
            "file descriptor:\n"
            "any unflushed buffered port data is ignored.")
#define FUNC_NAME s_scm_send
{
  int rv;
  int fd;
  int flg;

  sock = SCM_COERCE_OUTPORT (sock);
  SCM_VALIDATE_OPFPORT (1, sock);
  SCM_VALIDATE_STRING (2, message);
  SCM_VALIDATE_INUM_DEF_COPY (3, flags,0, flg);
  fd = SCM_FPORT_FDES (sock);

  SCM_SYSCALL (rv = send (fd, SCM_STRING_CHARS (message), SCM_STRING_LENGTH (message), flg));
  if (rv == -1)
    SCM_SYSERROR;
  return SCM_MAKINUM (rv);
}
#undef FUNC_NAME

SCM_DEFINE (scm_recvfrom, "recvfrom!", 2, 3, 0,
            (SCM sock, SCM str, SCM flags, SCM start, SCM end),
            "Return data from the socket port @var{sock} and also\n"
            "information about where the data was received from.\n"
            "@var{sock} must already be bound to the address from which\n"
            "data is to be received.  @code{str}, is a string into which the\n"
            "data will be written.  The size of @var{str} limits the amount\n"
            "of data which can be received: in the case of packet protocols,\n"
            "if a packet larger than this limit is encountered then some\n"
            "data will be irrevocably lost.\n\n"
            "The optional @var{flags} argument is a value or bitwise OR of\n"
            "@code{MSG_OOB}, @code{MSG_PEEK}, @code{MSG_DONTROUTE} etc.\n\n"
            "The value returned is a pair: the @emph{car} is the number of\n"
            "bytes read from the socket and the @emph{cdr} an address object\n"
            "in the same form as returned by @code{accept}.  The address\n"
            "will given as @code{#f} if not available, as is usually the\n"
            "case for stream sockets.\n\n"
            "The @var{start} and @var{end} arguments specify a substring of\n"
            "@var{str} to which the data should be written.\n\n"
            "Note that the data is read directly from the socket file\n"
            "descriptor: any unread buffered port data is ignored.")
#define FUNC_NAME s_scm_recvfrom
{
  int rv;
  int fd;
  int flg;
  char *buf;
  int offset;
  int cend;
  SCM address;
  int addr_size = MAX_ADDR_SIZE;
  char max_addr[MAX_ADDR_SIZE];
  struct sockaddr *addr = (struct sockaddr *) max_addr;

  SCM_VALIDATE_OPFPORT (1, sock);
  fd = SCM_FPORT_FDES (sock);
  SCM_VALIDATE_SUBSTRING_SPEC_COPY (2, str, buf, 4, start, offset,
                                    5, end, cend);
  if (SCM_UNBNDP (flags))
    flg = 0;
  else
    SCM_VALIDATE_ULONG_COPY (3, flags, flg);

  /* recvfrom will not necessarily return an address.  usually nothing
     is returned for stream sockets.  */
  addr->sa_family = AF_UNSPEC;
  SCM_SYSCALL (rv = recvfrom (fd, buf + offset,
                              cend - offset, flg,
                              addr, &addr_size));
  if (rv == -1)
    SCM_SYSERROR;
  if (addr->sa_family != AF_UNSPEC)
    address = scm_addr_vector (addr, addr_size, FUNC_NAME);
  else
    address = SCM_BOOL_F;

  return scm_cons (SCM_MAKINUM (rv), address);
}
#undef FUNC_NAME

SCM_DEFINE (scm_sendto, "sendto", 4, 0, 1,
            (SCM sock, SCM message, SCM fam, SCM address, SCM args_and_flags),
            "Transmit the string @var{message} on the socket port\n"
            "@var{sock}.  The\n"
            "destination address is specified using the @var{fam},\n"
            "@var{address} and\n"
            "@var{args_and_flags} arguments, in a similar way to the\n"
            "@code{connect} procedure.  @var{args_and_flags} contains\n"
            "the usual connection arguments optionally followed by\n"
            "a flags argument, which is a value or\n"
            "bitwise OR of MSG_OOB, MSG_PEEK, MSG_DONTROUTE etc.\n\n"
            "The value returned is the number of bytes transmitted --\n"
            "it's possible for\n"
            "this to be less than the length of @var{message} if the\n"
            "socket is\n"
            "set to be non-blocking.\n"
            "Note that the data is written directly to the socket\n"
            "file descriptor:\n"
            "any unflushed buffered port data is ignored.")
#define FUNC_NAME s_scm_sendto
{
  int rv;
  int fd;
  int flg;
  struct sockaddr *soka;
  int size;

  sock = SCM_COERCE_OUTPORT (sock);
  SCM_VALIDATE_FPORT (1, sock);
  SCM_VALIDATE_STRING (2, message);
  SCM_VALIDATE_INUM (3, fam);
  fd = SCM_FPORT_FDES (sock);
  soka = scm_fill_sockaddr (SCM_INUM (fam), address, &args_and_flags, 4,
                            FUNC_NAME, &size);
  if (SCM_NULLP (args_and_flags))
    flg = 0;
  else
    {
      SCM_VALIDATE_CONS (5, args_and_flags);
      flg = SCM_NUM2ULONG (5, SCM_CAR (args_and_flags));
    }
  SCM_SYSCALL (rv = sendto (fd, SCM_STRING_CHARS (message),
                            SCM_STRING_LENGTH (message),
                            flg, soka, size));
  if (rv == -1)
    {
      int save_errno = errno;
      free (soka);
      errno = save_errno;
      SCM_SYSERROR;
    }
  free (soka);
  return SCM_MAKINUM (rv);
}
#undef FUNC_NAME
\f


void
scm_init_socket ()
{
  /* protocol families.  */
#ifdef AF_UNSPEC
  scm_c_define ("AF_UNSPEC", SCM_MAKINUM (AF_UNSPEC));
#endif
#ifdef AF_UNIX
  scm_c_define ("AF_UNIX", SCM_MAKINUM (AF_UNIX));
#endif
#ifdef AF_INET
  scm_c_define ("AF_INET", SCM_MAKINUM (AF_INET));
#endif
#ifdef AF_INET6
  scm_c_define ("AF_INET6", SCM_MAKINUM (AF_INET6));
#endif

#ifdef PF_UNSPEC
  scm_c_define ("PF_UNSPEC", SCM_MAKINUM (PF_UNSPEC));
#endif
#ifdef PF_UNIX
  scm_c_define ("PF_UNIX", SCM_MAKINUM (PF_UNIX));
#endif
#ifdef PF_INET
  scm_c_define ("PF_INET", SCM_MAKINUM (PF_INET));
#endif
#ifdef PF_INET6
  scm_c_define ("PF_INET6", SCM_MAKINUM (PF_INET6));
#endif

  /* standard addresses.  */
#ifdef INADDR_ANY
  scm_c_define ("INADDR_ANY", scm_ulong2num (INADDR_ANY));
#endif
#ifdef INADDR_BROADCAST
  scm_c_define ("INADDR_BROADCAST", scm_ulong2num (INADDR_BROADCAST));
#endif
#ifdef INADDR_NONE
  scm_c_define ("INADDR_NONE", scm_ulong2num (INADDR_NONE));
#endif
#ifdef INADDR_LOOPBACK
  scm_c_define ("INADDR_LOOPBACK", scm_ulong2num (INADDR_LOOPBACK));
#endif

  /* socket types.  */
#ifdef SOCK_STREAM
  scm_c_define ("SOCK_STREAM", SCM_MAKINUM (SOCK_STREAM));
#endif
#ifdef SOCK_DGRAM
  scm_c_define ("SOCK_DGRAM", SCM_MAKINUM (SOCK_DGRAM));
#endif
#ifdef SOCK_RAW
  scm_c_define ("SOCK_RAW", SCM_MAKINUM (SOCK_RAW));
#endif

  /* setsockopt level.  */
#ifdef SOL_SOCKET
  scm_c_define ("SOL_SOCKET", SCM_MAKINUM (SOL_SOCKET));
#endif
#ifdef SOL_IP
  scm_c_define ("SOL_IP", SCM_MAKINUM (SOL_IP));
#endif
#ifdef SOL_TCP
  scm_c_define ("SOL_TCP", SCM_MAKINUM (SOL_TCP));
#endif
#ifdef SOL_UDP
  scm_c_define ("SOL_UDP", SCM_MAKINUM (SOL_UDP));
#endif

  /* setsockopt names.  */
#ifdef SO_DEBUG
  scm_c_define ("SO_DEBUG", SCM_MAKINUM (SO_DEBUG));
#endif
#ifdef SO_REUSEADDR
  scm_c_define ("SO_REUSEADDR", SCM_MAKINUM (SO_REUSEADDR));
#endif
#ifdef SO_STYLE
  scm_c_define ("SO_STYLE", SCM_MAKINUM (SO_STYLE));
#endif
#ifdef SO_TYPE
  scm_c_define ("SO_TYPE", SCM_MAKINUM (SO_TYPE));
#endif
#ifdef SO_ERROR
  scm_c_define ("SO_ERROR", SCM_MAKINUM (SO_ERROR));
#endif
#ifdef SO_DONTROUTE
  scm_c_define ("SO_DONTROUTE", SCM_MAKINUM (SO_DONTROUTE));
#endif
#ifdef SO_BROADCAST
  scm_c_define ("SO_BROADCAST", SCM_MAKINUM (SO_BROADCAST));
#endif
#ifdef SO_SNDBUF
  scm_c_define ("SO_SNDBUF", SCM_MAKINUM (SO_SNDBUF));
#endif
#ifdef SO_RCVBUF
  scm_c_define ("SO_RCVBUF", SCM_MAKINUM (SO_RCVBUF));
#endif
#ifdef SO_KEEPALIVE
  scm_c_define ("SO_KEEPALIVE", SCM_MAKINUM (SO_KEEPALIVE));
#endif
#ifdef SO_OOBINLINE
  scm_c_define ("SO_OOBINLINE", SCM_MAKINUM (SO_OOBINLINE));
#endif
#ifdef SO_NO_CHECK
  scm_c_define ("SO_NO_CHECK", SCM_MAKINUM (SO_NO_CHECK));
#endif
#ifdef SO_PRIORITY
  scm_c_define ("SO_PRIORITY", SCM_MAKINUM (SO_PRIORITY));
#endif
#ifdef SO_LINGER
  scm_c_define ("SO_LINGER", SCM_MAKINUM (SO_LINGER));
#endif

  /* recv/send options.  */
#ifdef MSG_OOB
  scm_c_define ("MSG_OOB", SCM_MAKINUM (MSG_OOB));
#endif
#ifdef MSG_PEEK
  scm_c_define ("MSG_PEEK", SCM_MAKINUM (MSG_PEEK));
#endif
#ifdef MSG_DONTROUTE
  scm_c_define ("MSG_DONTROUTE", SCM_MAKINUM (MSG_DONTROUTE));
#endif

#ifdef __MINGW32__
  scm_i_init_socket_Win32 ();
#endif

  scm_add_feature ("socket");

#include "libguile/socket.x"
}


/*
  Local Variables:
  c-file-style: "gnu"
  End:
*/