newlib-cygwin/winsup/cygwin/net.cc

/* net.cc: network-related routines.

   Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.

This file is part of Cygwin.

This software is a copyrighted work licensed under the terms of the
Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
details. */

/* #define DEBUG_NEST_ON 1 */

#define  __INSIDE_CYGWIN_NET__

#include "winsup.h"
#include <errno.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <iphlpapi.h>

#include <stdlib.h>
#include <unistd.h>
#include <netdb.h>
#include <fcntl.h>
#define USE_SYS_TYPES_FD_SET
#include <winsock2.h>
#include "cygerrno.h"
#include "security.h"
#include "fhandler.h"
#include "path.h"
#include "dtable.h"
#include "cygheap.h"
#include "sync.h"
#include "sigproc.h"
#include "pinfo.h"
#include "registry.h"
#include <sys/uio.h>

extern "C" {
int h_errno;

int __stdcall rcmd (char **ahost, unsigned short inport, char *locuser,
		    char *remuser, char *cmd, SOCKET *fd2p);
int __stdcall rexec (char **ahost, unsigned short inport, char *locuser,
		     char *password, char *cmd, SOCKET *fd2p);
int __stdcall rresvport (int *);
int sscanf (const char *, const char *, ...);
} /* End of "C" section */

class wsock_event
{
  WSAEVENT		event;
  WSAOVERLAPPED		ovr;
public:
  wsock_event () : event (NULL) {};
  ~wsock_event ()
    {
      if (event)
	WSACloseEvent (event);
      event = NULL;
    };

  LPWSAOVERLAPPED prepare ();
  int wait (int socket, LPDWORD flags);
};

LPWSAOVERLAPPED
wsock_event::prepare ()
{
  LPWSAOVERLAPPED ret = NULL;

  SetLastError (0);
  if ((event = WSACreateEvent ()) != WSA_INVALID_EVENT)
    {
      memset (&ovr, 0, sizeof ovr);
      ovr.hEvent = event;
      ret = &ovr;
    }
  else if (GetLastError () == ERROR_PROC_NOT_FOUND) /* winsock2 not available */
    WSASetLastError (0);

  debug_printf ("%d = wsock_event::prepare ()", ret);
  return ret;
}

int
wsock_event::wait (int socket, LPDWORD flags)
{
  int ret = -1;
  WSAEVENT ev[2] = { event, signal_arrived };

  switch (WSAWaitForMultipleEvents(2, ev, FALSE, WSA_INFINITE, FALSE))
    {
    case WSA_WAIT_EVENT_0:
      DWORD len;
      if (WSAGetOverlappedResult(socket, &ovr, &len, FALSE, flags))
	ret = (int) len;
      break;
    case WSA_WAIT_EVENT_0 + 1:
      if (!CancelIo ((HANDLE)socket))
	{
	  debug_printf ("CancelIo() %E, fallback to blocking io");
	  WSAGetOverlappedResult(socket, &ovr, &len, TRUE, flags);
	}
      else
	WSASetLastError (WSAEINTR);
      break;
    case WSA_WAIT_FAILED:
      break;
    default: /* Should be impossible. *LOL* */
      WSASetLastError (WSAEFAULT);
      break;
    }
  WSACloseEvent (event);
  event = NULL;
  return ret;
}

WSADATA wsadata;

/* Cygwin internal */
static fhandler_socket *
get (int fd)
{
  cygheap_fdget cfd (fd);
  if (cfd < 0)
    return 0;

  return cfd->is_socket ();
}

/* Cygwin internal */
static SOCKET __stdcall
set_socket_inheritance (SOCKET sock)
{
  SOCKET osock = sock;
  if (!DuplicateHandle (hMainProc, (HANDLE) sock, hMainProc, (HANDLE *) &sock,
			0, TRUE, DUPLICATE_SAME_ACCESS | DUPLICATE_CLOSE_SOURCE))
    system_printf ("DuplicateHandle failed %E");
  else
    debug_printf ("DuplicateHandle succeeded osock %p, sock %p", osock, sock);
  return sock;
}

/* htonl: standards? */
extern "C" unsigned long int
htonl (unsigned long int x)
{
  return ((((x & 0x000000ffU) << 24) |
	   ((x & 0x0000ff00U) <<  8) |
	   ((x & 0x00ff0000U) >>  8) |
	   ((x & 0xff000000U) >> 24)));
}

/* ntohl: standards? */
extern "C" unsigned long int
ntohl (unsigned long int x)
{
  return htonl (x);
}

/* htons: standards? */
extern "C" unsigned short
htons (unsigned short x)
{
  return ((((x & 0x000000ffU) << 8) |
	   ((x & 0x0000ff00U) >> 8)));
}

/* ntohs: standards? */
extern "C" unsigned short
ntohs (unsigned short x)
{
  return htons (x);
}

/* Cygwin internal */
static void
dump_protoent (struct protoent *p)
{
  if (p)
    debug_printf ("protoent %s %x %x", p->p_name, p->p_aliases, p->p_proto);
}

/* exported as inet_ntoa: BSD 4.3 */
extern "C" char *
cygwin_inet_ntoa (struct in_addr in)
{
#ifdef _MT_SAFE
#define ntoa_buf  _reent_winsup ()->_ntoa_buf
#else
  static char *ntoa_buf = NULL;
#endif

  char *res = inet_ntoa (in);
  if (ntoa_buf)
    {
      free (ntoa_buf);
      ntoa_buf = NULL;
    }
  if (res)
    ntoa_buf = strdup (res);
  return ntoa_buf;
}

/* exported as inet_addr: BSD 4.3 */
extern "C" unsigned long
cygwin_inet_addr (const char *cp)
{
  if (check_null_str_errno (cp))
    return INADDR_NONE;
  unsigned long res = inet_addr (cp);
  return res;
}

/* exported as inet_aton: BSD 4.3
   inet_aton is not exported by wsock32 and ws2_32,
   so it has to be implemented here. */
extern "C" int
cygwin_inet_aton (const char *cp, struct in_addr *inp)
{
  if (check_null_str_errno (cp) || check_null_invalid_struct_errno (inp))
    return 0;

  unsigned long res = inet_addr (cp);
  if (res == INADDR_NONE && strcmp (cp, "255.255.255.255"))
    return 0;
  if (inp)
    inp->s_addr = res;
  return 1;
}

/* undocumented in wsock32.dll */
extern "C" unsigned int	WINAPI inet_network (const char *);

extern "C" unsigned int
cygwin_inet_network (const char *cp)
{
  if (check_null_str_errno (cp))
    return INADDR_NONE;
  unsigned int res = inet_network (cp);
  return res;
}

/* inet_netof is in the standard BSD sockets library.  It is useless
   for modern networks, since it assumes network values which are no
   longer meaningful, but some existing code calls it.  */

extern "C" unsigned long
inet_netof (struct in_addr in)
{
  unsigned long i, res;

  i = ntohl (in.s_addr);
  if (IN_CLASSA (i))
    res = (i & IN_CLASSA_NET) >> IN_CLASSA_NSHIFT;
  else if (IN_CLASSB (i))
    res = (i & IN_CLASSB_NET) >> IN_CLASSB_NSHIFT;
  else
    res = (i & IN_CLASSC_NET) >> IN_CLASSC_NSHIFT;


  return res;
}

/* inet_makeaddr is in the standard BSD sockets library.  It is
   useless for modern networks, since it assumes network values which
   are no longer meaningful, but some existing code calls it.  */

extern "C" struct in_addr
inet_makeaddr (int net, int lna)
{
  unsigned long i;
  struct in_addr in;

  if (net < IN_CLASSA_MAX)
    i = (net << IN_CLASSA_NSHIFT) | (lna & IN_CLASSA_HOST);
  else if (net < IN_CLASSB_MAX)
    i = (net << IN_CLASSB_NSHIFT) | (lna & IN_CLASSB_HOST);
  else if (net < 0x1000000)
    i = (net << IN_CLASSC_NSHIFT) | (lna & IN_CLASSC_HOST);
  else
    i = net | lna;

  in.s_addr = htonl (i);


  return in;
}

struct tl
{
  int w;
  const char *s;
  int e;
};

static NO_COPY struct tl errmap[] =
{
 {WSAEINTR, "WSAEINTR", EINTR},
 {WSAEWOULDBLOCK, "WSAEWOULDBLOCK", EWOULDBLOCK},
 {WSAEINPROGRESS, "WSAEINPROGRESS", EINPROGRESS},
 {WSAEALREADY, "WSAEALREADY", EALREADY},
 {WSAENOTSOCK, "WSAENOTSOCK", ENOTSOCK},
 {WSAEDESTADDRREQ, "WSAEDESTADDRREQ", EDESTADDRREQ},
 {WSAEMSGSIZE, "WSAEMSGSIZE", EMSGSIZE},
 {WSAEPROTOTYPE, "WSAEPROTOTYPE", EPROTOTYPE},
 {WSAENOPROTOOPT, "WSAENOPROTOOPT", ENOPROTOOPT},
 {WSAEPROTONOSUPPORT, "WSAEPROTONOSUPPORT", EPROTONOSUPPORT},
 {WSAESOCKTNOSUPPORT, "WSAESOCKTNOSUPPORT", ESOCKTNOSUPPORT},
 {WSAEOPNOTSUPP, "WSAEOPNOTSUPP", EOPNOTSUPP},
 {WSAEPFNOSUPPORT, "WSAEPFNOSUPPORT", EPFNOSUPPORT},
 {WSAEAFNOSUPPORT, "WSAEAFNOSUPPORT", EAFNOSUPPORT},
 {WSAEADDRINUSE, "WSAEADDRINUSE", EADDRINUSE},
 {WSAEADDRNOTAVAIL, "WSAEADDRNOTAVAIL", EADDRNOTAVAIL},
 {WSAENETDOWN, "WSAENETDOWN", ENETDOWN},
 {WSAENETUNREACH, "WSAENETUNREACH", ENETUNREACH},
 {WSAENETRESET, "WSAENETRESET", ENETRESET},
 {WSAECONNABORTED, "WSAECONNABORTED", ECONNABORTED},
 {WSAECONNRESET, "WSAECONNRESET", ECONNRESET},
 {WSAENOBUFS, "WSAENOBUFS", ENOBUFS},
 {WSAEISCONN, "WSAEISCONN", EISCONN},
 {WSAENOTCONN, "WSAENOTCONN", ENOTCONN},
 {WSAESHUTDOWN, "WSAESHUTDOWN", ESHUTDOWN},
 {WSAETOOMANYREFS, "WSAETOOMANYREFS", ETOOMANYREFS},
 {WSAETIMEDOUT, "WSAETIMEDOUT", ETIMEDOUT},
 {WSAECONNREFUSED, "WSAECONNREFUSED", ECONNREFUSED},
 {WSAELOOP, "WSAELOOP", ELOOP},
 {WSAENAMETOOLONG, "WSAENAMETOOLONG", ENAMETOOLONG},
 {WSAEHOSTDOWN, "WSAEHOSTDOWN", EHOSTDOWN},
 {WSAEHOSTUNREACH, "WSAEHOSTUNREACH", EHOSTUNREACH},
 {WSAENOTEMPTY, "WSAENOTEMPTY", ENOTEMPTY},
 {WSAEPROCLIM, "WSAEPROCLIM", EPROCLIM},
 {WSAEUSERS, "WSAEUSERS", EUSERS},
 {WSAEDQUOT, "WSAEDQUOT", EDQUOT},
 {WSAESTALE, "WSAESTALE", ESTALE},
 {WSAEREMOTE, "WSAEREMOTE", EREMOTE},
 {WSAEINVAL, "WSAEINVAL", EINVAL},
 {WSAEFAULT, "WSAEFAULT", EFAULT},
 {0, "NOERROR", 0},
 {0, NULL, 0}
};

static int
find_winsock_errno (int why)
{
  for (int i = 0; errmap[i].s != NULL; ++i)
    if (why == errmap[i].w)
      return errmap[i].e;

  return EPERM;
}

/* Cygwin internal */
void
__set_winsock_errno (const char *fn, int ln)
{
  DWORD werr = WSAGetLastError ();
  int err = find_winsock_errno (werr);
  set_errno (err);
  syscall_printf ("%s:%d - winsock error %d -> errno %d", fn, ln, werr, err);
}

/*
 * Since the member `s' isn't used for debug output we can use it
 * for the error text returned by herror and hstrerror.
 */
static NO_COPY struct tl host_errmap[] =
{
  {WSAHOST_NOT_FOUND, "Unknown host", HOST_NOT_FOUND},
  {WSATRY_AGAIN, "Host name lookup failure", TRY_AGAIN},
  {WSANO_RECOVERY, "Unknown server error", NO_RECOVERY},
  {WSANO_DATA, "No address associated with name", NO_DATA},
  {0, NULL, 0}
};

/* Cygwin internal */
static void
set_host_errno ()
{
  int i;

  int why = WSAGetLastError ();
  for (i = 0; host_errmap[i].w != 0; ++i)
    if (why == host_errmap[i].w)
      break;

  if (host_errmap[i].w != 0)
    h_errno = host_errmap[i].e;
  else
    h_errno = NETDB_INTERNAL;
}

static void
free_char_list (char **clist)
{
  if (clist)
    {
      for (char **cl = clist; *cl; ++cl)
	free (*cl);
      free (clist);
    }
}

static char **
dup_char_list (char **src)
{
  char **dst;
  int cnt = 0;

  for (char **cl = src; *cl; ++cl)
    ++cnt;
  if (!(dst = (char **) calloc (cnt + 1, sizeof *dst)))
    return NULL;
  while (cnt-- > 0)
    if (!(dst[cnt] = strdup (src[cnt])))
      return NULL;
  return dst;
}

#define free_addr_list(addr_list)	free_char_list (addr_list)

static char **
dup_addr_list (char **src, unsigned int size)
{
  char **dst;
  int cnt = 0;

  for (char **cl = src; *cl; ++cl)
    ++cnt;
  if (!(dst = (char **) calloc (cnt + 1, sizeof *dst)))
    return NULL;
  while (cnt-- > 0)
    {
      if (!(dst[cnt] = (char *) malloc(size)))
	return NULL;
      memcpy(dst[cnt], src[cnt], size);
    }
  return dst;
}

static void
free_protoent_ptr (struct protoent *&p)
{
  if (p)
    {
      debug_printf ("protoent: %s", p->p_name);

      if (p->p_name)
	free (p->p_name);
      free_char_list (p->p_aliases);
      p = NULL;
    }
}

static struct protoent *
dup_protoent_ptr (struct protoent *src)
{
  if (!src)
    return NULL;

  struct protoent *dst = (struct protoent *) calloc (1, sizeof *dst);
  if (!dst)
    return NULL;

  debug_printf ("protoent: %s", src->p_name);

  dst->p_proto = src->p_proto;
  if (src->p_name && !(dst->p_name = strdup (src->p_name)))
    goto out;
  if (src->p_aliases && !(dst->p_aliases = dup_char_list (src->p_aliases)))
    goto out;

  debug_printf ("protoent: copied %s", dst->p_name);

  return dst;

out:
  free_protoent_ptr (dst);
  return NULL;
}

#ifdef _MT_SAFE
#define protoent_buf  _reent_winsup ()->_protoent_buf
#else
  static struct protoent *protoent_buf = NULL;
#endif

/* exported as getprotobyname: standards? */
extern "C" struct protoent *
cygwin_getprotobyname (const char *p)
{
  if (check_null_str_errno (p))
    return NULL;
  free_protoent_ptr (protoent_buf);
  protoent_buf = dup_protoent_ptr (getprotobyname (p));
  if (!protoent_buf)
    set_winsock_errno ();

  dump_protoent (protoent_buf);
  return protoent_buf;
}

/* exported as getprotobynumber: standards? */
extern "C" struct protoent *
cygwin_getprotobynumber (int number)
{
  free_protoent_ptr (protoent_buf);
  protoent_buf = dup_protoent_ptr (getprotobynumber (number));
  if (!protoent_buf)
    set_winsock_errno ();

  dump_protoent (protoent_buf);
  return protoent_buf;
}

fhandler_socket *
fdsock (int& fd, const char *name, SOCKET soc)
{
  if (!winsock2_active)
    soc = set_socket_inheritance (soc);
  else
    debug_printf ("not setting socket inheritance since winsock2_active %d", winsock2_active);
  fhandler_socket *fh = (fhandler_socket *) cygheap->fdtab.build_fhandler (fd, FH_SOCKET, name);
  fh->set_io_handle ((HANDLE) soc);
  fh->set_flags (O_RDWR);
  fh->set_name (name, name);
  debug_printf ("fd %d, name '%s', soc %p", fd, name, soc);
  return fh;
}

/* exported as socket: standards? */
extern "C" int
cygwin_socket (int af, int type, int protocol)
{
  int res = -1;
  SOCKET soc = 0;

  cygheap_fdnew fd;

  if (fd >= 0)
    {
      debug_printf ("socket (%d, %d, %d)", af, type, protocol);

      soc = socket (AF_INET, type, af == AF_LOCAL ? 0 : protocol);

      if (soc == INVALID_SOCKET)
	{
	  set_winsock_errno ();
	  goto done;
	}

      const char *name;
      if (af == AF_INET)
	name = (type == SOCK_STREAM ? "/dev/tcp" : "/dev/udp");
      else
	name = (type == SOCK_STREAM ? "/dev/streamsocket" : "/dev/dgsocket");

      fdsock (fd, name, soc)->set_addr_family (af);
      res = fd;
    }

done:
  syscall_printf ("%d = socket (%d, %d, %d)", res, af, type, protocol);
  return res;
}

/* cygwin internal: map sockaddr into internet domain address */

static int get_inet_addr (const struct sockaddr *in, int inlen,
			   struct sockaddr_in *out, int *outlen, int* secret = 0)
{
  int secret_buf [4];
  int* secret_ptr = (secret ? : secret_buf);

  if (in->sa_family == AF_INET)
    {
      *out = * (sockaddr_in *)in;
      *outlen = inlen;
      return 1;
    }
  else if (in->sa_family == AF_LOCAL)
    {
      int fd = _open (in->sa_data, O_RDONLY);
      if (fd == -1)
	return 0;

      int ret = 0;
      char buf[128];
      memset (buf, 0, sizeof buf);
      if (read (fd, buf, sizeof buf) != -1)
	{
	  sockaddr_in sin;
	  sin.sin_family = AF_INET;
	  sscanf (buf + strlen (SOCKET_COOKIE), "%hu %08x-%08x-%08x-%08x",
		  &sin.sin_port,
		  secret_ptr, secret_ptr + 1, secret_ptr + 2, secret_ptr + 3);
	  sin.sin_port = htons (sin.sin_port);
	  sin.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
	  *out = sin;
	  *outlen = sizeof sin;
	  ret = 1;
	}
      _close (fd);
      return ret;
    }
  else
    {
      set_errno (EAFNOSUPPORT);
      return 0;
    }
}

/* exported as sendto: standards? */
extern "C" int
cygwin_sendto (int fd,
	       const void *buf,
	       int len,
	       unsigned int flags,
	       const struct sockaddr *to,
	       int tolen)
{
  int res;
  wsock_event wsock_evt;
  LPWSAOVERLAPPED ovr;
  fhandler_socket *h = get (fd);

  if ((len && __check_invalid_read_ptr_errno (buf, (unsigned) len))
      || __check_null_invalid_struct_errno (to, tolen)
      || !h)
    res = -1;
  else
    {
      sockaddr_in sin;
      sigframe thisframe (mainthread);

      if (get_inet_addr (to, tolen, &sin, &tolen) == 0)
	return -1;

      if (h->is_nonblocking () || !(ovr = wsock_evt.prepare ()))
	{
	  debug_printf ("Fallback to winsock 1 sendto call");
	  if ((res = sendto (h->get_socket (), (const char *) buf, len, flags,
			     (sockaddr *) &sin, tolen)) == SOCKET_ERROR)
	    {
	      set_winsock_errno ();
	      res = -1;
	    }
	}
      else
	{
	  WSABUF wsabuf = { len, (char *) buf };
	  DWORD ret = 0;
	  if (WSASendTo (h->get_socket (), &wsabuf, 1, &ret, (DWORD)flags,
			 (sockaddr *) &sin, tolen, ovr, NULL) != SOCKET_ERROR)
	    res = ret;
	  else if ((res = WSAGetLastError ()) != WSA_IO_PENDING)
	    {
	      set_winsock_errno ();
	      res = -1;
	    }
	  else if ((res = wsock_evt.wait (h->get_socket (), (DWORD *)&flags)) == -1)
	    set_winsock_errno ();
	}
    }

  syscall_printf ("%d = sendto (%d, %x, %x, %x)", res, fd, buf, len, flags);

  return res;
}

/* exported as recvfrom: standards? */
extern "C" int
cygwin_recvfrom (int fd,
		   char *buf,
		   int len,
		   int flags,
		   struct sockaddr *from,
		   int *fromlen)
{
  int res;
  wsock_event wsock_evt;
  LPWSAOVERLAPPED ovr;
  fhandler_socket *h = get (fd);

  if (__check_null_invalid_struct_errno (buf, (unsigned) len)
      || check_null_invalid_struct_errno (fromlen)
      || (from && __check_null_invalid_struct_errno (from, (unsigned) *fromlen))
      || !h)
    res = -1;
  else
    {
      sigframe thisframe (mainthread);

      if (h->is_nonblocking () ||!(ovr = wsock_evt.prepare ()))
	{
	  debug_printf ("Fallback to winsock 1 recvfrom call");
	  if ((res = recvfrom (h->get_socket (), buf, len, flags, from, fromlen))
	      == SOCKET_ERROR)
	    {
	      set_winsock_errno ();
	      res = -1;
	    }
	}
      else
	{
	  WSABUF wsabuf = { len, (char *) buf };
	  DWORD ret = 0;
	  if (WSARecvFrom (h->get_socket (), &wsabuf, 1, &ret, (DWORD *)&flags,
			   from, fromlen, ovr, NULL) != SOCKET_ERROR)
	    res = ret;
	  else if ((res = WSAGetLastError ()) != WSA_IO_PENDING)
	    {
	      set_winsock_errno ();
	      res = -1;
	    }
	  else if ((res = wsock_evt.wait (h->get_socket (), (DWORD *)&flags)) == -1)
	    set_winsock_errno ();
	}
    }

  syscall_printf ("%d = recvfrom (%d, %x, %x, %x)", res, fd, buf, len, flags);

  return res;
}

/* exported as setsockopt: standards? */
extern "C" int
cygwin_setsockopt (int fd,
		     int level,
		     int optname,
		     const void *optval,
		     int optlen)
{
  fhandler_socket *h = get (fd);
  int res = -1;
  const char *name = "error";

  if ((!optval || !__check_invalid_read_ptr_errno (optval, optlen)) && h)
    {
      /* For the following debug_printf */
      switch (optname)
	{
	case SO_DEBUG:
	  name="SO_DEBUG";
	  break;
	case SO_ACCEPTCONN:
	  name="SO_ACCEPTCONN";
	  break;
	case SO_REUSEADDR:
	  name="SO_REUSEADDR";
	  break;
	case SO_KEEPALIVE:
	  name="SO_KEEPALIVE";
	  break;
	case SO_DONTROUTE:
	  name="SO_DONTROUTE";
	  break;
	case SO_BROADCAST:
	  name="SO_BROADCAST";
	  break;
	case SO_USELOOPBACK:
	  name="SO_USELOOPBACK";
	  break;
	case SO_LINGER:
	  name="SO_LINGER";
	  break;
	case SO_OOBINLINE:
	  name="SO_OOBINLINE";
	  break;
	case SO_ERROR:
	  name="SO_ERROR";
	  break;
	}

      res = setsockopt (h->get_socket (), level, optname,
				     (const char *) optval, optlen);

      if (optlen == 4)
	syscall_printf ("setsockopt optval=%x", *(long *) optval);

      if (res)
	set_winsock_errno ();
    }

  syscall_printf ("%d = setsockopt (%d, %d, %x (%s), %x, %d)",
		  res, fd, level, optname, name, optval, optlen);
  return res;
}

/* exported as getsockopt: standards? */
extern "C" int
cygwin_getsockopt (int fd,
		     int level,
		     int optname,
		     void *optval,
		     int *optlen)
{
  fhandler_socket *h = get (fd);
  int res = -1;
  const char *name = "error";
  if (!check_null_invalid_struct_errno (optlen)
      && (!optval || !__check_null_invalid_struct_errno (optval, (unsigned) *optlen))
      && h)
    {
      /* For the following debug_printf */
      switch (optname)
	{
	case SO_DEBUG:
	  name="SO_DEBUG";
	  break;
	case SO_ACCEPTCONN:
	  name="SO_ACCEPTCONN";
	  break;
	case SO_REUSEADDR:
	  name="SO_REUSEADDR";
	  break;
	case SO_KEEPALIVE:
	  name="SO_KEEPALIVE";
	  break;
	case SO_DONTROUTE:
	  name="SO_DONTROUTE";
	  break;
	case SO_BROADCAST:
	  name="SO_BROADCAST";
	  break;
	case SO_USELOOPBACK:
	  name="SO_USELOOPBACK";
	  break;
	case SO_LINGER:
	  name="SO_LINGER";
	  break;
	case SO_OOBINLINE:
	  name="SO_OOBINLINE";
	  break;
	case SO_ERROR:
	  name="SO_ERROR";
	  break;
	}

      res = getsockopt (h->get_socket (), level, optname,
				       (char *) optval, (int *) optlen);

      if (optname == SO_ERROR)
	{
	  int *e = (int *) optval;
	  *e = find_winsock_errno (*e);
	}

      if (res)
	set_winsock_errno ();
    }

  syscall_printf ("%d = getsockopt (%d, %d, %x (%s), %x, %d)",
		  res, fd, level, optname, name, optval, optlen);
  return res;
}

/* exported as connect: standards? */
extern "C" int
cygwin_connect (int fd,
		  const struct sockaddr *name,
		  int namelen)
{
  int res;
  BOOL secret_check_failed = FALSE;
  BOOL in_progress = FALSE;
  fhandler_socket *sock = get (fd);
  sockaddr_in sin;
  int secret [4];
  sigframe thisframe (mainthread);

  if (__check_invalid_read_ptr_errno (name, namelen))
    return -1;

  if (get_inet_addr (name, namelen, &sin, &namelen, secret) == 0)
    return -1;

  if (!sock)
    res = -1;
  else
    {
      res = connect (sock->get_socket (), (sockaddr *) &sin, namelen);
      if (res)
	{
	  /* Special handling for connect to return the correct error code
	     when called on a non-blocking socket. */
	  if (sock->is_nonblocking ())
	    {
	      DWORD err = WSAGetLastError ();
	      if (err == WSAEWOULDBLOCK || err == WSAEALREADY)
		{
		  WSASetLastError (WSAEINPROGRESS);
		  in_progress = TRUE;
		}
	      else if (err == WSAEINVAL)
		WSASetLastError (WSAEISCONN);
	    }
	  set_winsock_errno ();
	}
      if (sock->get_addr_family () == AF_LOCAL)
	{
	  if (!res || in_progress)
	    {
	      if (!sock->create_secret_event (secret))
		{
		  secret_check_failed = TRUE;
		}
	      else if (in_progress)
		sock->signal_secret_event ();
	    }

	  if (!secret_check_failed && !res)
	    {
	      if (!sock->check_peer_secret_event (&sin, secret))
		{
		  debug_printf ( "accept from unauthorized server" );
		  secret_check_failed = TRUE;
		}
	   }

	  if (secret_check_failed)
	    {
	      sock->close_secret_event ();
	      if (res)
		closesocket (res);
	      set_errno (ECONNREFUSED);
	      res = -1;
	    }
	}
    }
  return res;
}

static void
free_servent_ptr (struct servent *&p)
{
  if (p)
    {
      debug_printf ("servent: %s", p->s_name);

      if (p->s_name)
	free (p->s_name);
      if (p->s_proto)
	free (p->s_proto);
      free_char_list (p->s_aliases);
      p = NULL;
    }
}

#pragma pack(push,2)
struct pservent
{
  char *s_name;
  char **s_aliases;
  short s_port;
  char *s_proto;
};
#pragma pack(pop)
static struct servent *
dup_servent_ptr (struct servent *src)
{
  if (!src)
    return NULL;

  struct servent *dst = (struct servent *) calloc (1, sizeof *dst);
  if (!dst)
    return NULL;

  debug_printf ("servent: %s", src->s_name);

  dst->s_port = src->s_port;
  if (src->s_name && !(dst->s_name = strdup (src->s_name)))
    goto out;
  if (src->s_aliases && !(dst->s_aliases = dup_char_list (src->s_aliases)))
    goto out;
  char *s_proto;
  if (IsBadReadPtr (src->s_proto, sizeof (src->s_proto))
      && !IsBadReadPtr (((pservent *) src)->s_proto, sizeof (src->s_proto)))
    s_proto = ((pservent *)src)->s_proto;
  else
    s_proto = src->s_proto;

  if (s_proto && !(dst->s_proto = strdup (s_proto)))
    goto out;

  debug_printf ("servent: copied %s", dst->s_name);

  return dst;

out:
  free_servent_ptr (dst);
  return NULL;
}

#ifdef _MT_SAFE
#define servent_buf  _reent_winsup ()->_servent_buf
#else
  static struct servent *servent_buf = NULL;
#endif

/* exported as getservbyname: standards? */
extern "C" struct servent *
cygwin_getservbyname (const char *name, const char *proto)
{
  if (check_null_str_errno (name)
      || (proto != NULL && check_null_str_errno (proto)))
    return NULL;

  free_servent_ptr (servent_buf);
  servent_buf = dup_servent_ptr (getservbyname (name, proto));
  if (!servent_buf)
    set_winsock_errno ();

  syscall_printf ("%x = getservbyname (%s, %s)", servent_buf, name, proto);
  return servent_buf;
}

/* exported as getservbyport: standards? */
extern "C" struct servent *
cygwin_getservbyport (int port, const char *proto)
{
  if (proto != NULL && check_null_str_errno (proto))
    return NULL;

  free_servent_ptr (servent_buf);
  servent_buf = dup_servent_ptr (getservbyport (port, proto));
  if (!servent_buf)
    set_winsock_errno ();

  syscall_printf ("%x = getservbyport (%d, %s)", servent_buf, port, proto);
  return servent_buf;
}

extern "C" int
cygwin_gethostname (char *name, size_t len)
{
  int PASCAL win32_gethostname (char*, int);

  if (__check_null_invalid_struct_errno (name, len))
    return -1;

  if (wsock32_handle == NULL ||
      win32_gethostname (name, len) == SOCKET_ERROR)
    {
      DWORD local_len = len;

      if (!GetComputerNameA (name, &local_len))
	{
	  set_winsock_errno ();
	  return -1;
	}
    }
  debug_printf ("name %s\n", name);
  h_errno = 0;
  return 0;
}

static void
free_hostent_ptr (struct hostent *&p)
{
  if (p)
    {
      debug_printf ("hostent: %s", p->h_name);

      if (p->h_name)
	free ((void *)p->h_name);
      free_char_list (p->h_aliases);
      free_addr_list (p->h_addr_list);
      p = NULL;
    }
}

static struct hostent *
dup_hostent_ptr (struct hostent *src)
{
  if (!src)
    return NULL;

  struct hostent *dst = (struct hostent *) calloc (1, sizeof *dst);
  if (!dst)
    return NULL;

  debug_printf ("hostent: %s", src->h_name);

  dst->h_addrtype = src->h_addrtype;
  dst->h_length = src->h_length;
  if (src->h_name && !(dst->h_name = strdup (src->h_name)))
    goto out;
  if (src->h_aliases && !(dst->h_aliases = dup_char_list (src->h_aliases)))
    goto out;
  if (src->h_addr_list
      && !(dst->h_addr_list = dup_addr_list(src->h_addr_list, src->h_length)))
    goto out;

  debug_printf ("hostent: copied %s", dst->h_name);

  return dst;

out:
  free_hostent_ptr (dst);
  return NULL;
}

#ifdef _MT_SAFE
#define hostent_buf  _reent_winsup ()->_hostent_buf
#else
  static struct hostent *hostent_buf = NULL;
#endif

/* exported as gethostbyname: standards? */
extern "C" struct hostent *
cygwin_gethostbyname (const char *name)
{
  static unsigned char tmp_addr[4];
  static struct hostent tmp;
  static char *tmp_aliases[1];
  static char *tmp_addr_list[2];
  static int a, b, c, d;

  if (check_null_str_errno (name))
    return NULL;

  if (sscanf (name, "%d.%d.%d.%d", &a, &b, &c, &d) == 4)
    {
      /* In case you don't have DNS, at least x.x.x.x still works */
      memset (&tmp, 0, sizeof (tmp));
      tmp_addr[0] = a;
      tmp_addr[1] = b;
      tmp_addr[2] = c;
      tmp_addr[3] = d;
      tmp_addr_list[0] = (char *)tmp_addr;
      tmp.h_name = name;
      tmp.h_aliases = tmp_aliases;
      tmp.h_addrtype = 2;
      tmp.h_length = 4;
      tmp.h_addr_list = tmp_addr_list;
      return &tmp;
    }

  free_hostent_ptr (hostent_buf);
  hostent_buf = dup_hostent_ptr (gethostbyname (name));
  if (!hostent_buf)
    {
      set_winsock_errno ();
      set_host_errno ();
    }
  else
    {
      debug_printf ("h_name %s", hostent_buf->h_name);
      h_errno = 0;
    }
  return hostent_buf;
}

/* exported as gethostbyaddr: standards? */
extern "C" struct hostent *
cygwin_gethostbyaddr (const char *addr, int len, int type)
{
  if (__check_null_invalid_struct_errno (addr, len))
    return NULL;

  free_hostent_ptr (hostent_buf);
  hostent_buf = dup_hostent_ptr (gethostbyaddr (addr, len, type));
  if (!hostent_buf)
    {
      set_winsock_errno ();
      set_host_errno ();
    }
  else
    {
      debug_printf ("h_name %s", hostent_buf->h_name);
      h_errno = 0;
    }
  return hostent_buf;
}

/* exported as accept: standards? */
extern "C" int
cygwin_accept (int fd, struct sockaddr *peer, int *len)
{
  if (peer != NULL
      && (check_null_invalid_struct_errno (len)
	  || __check_null_invalid_struct_errno (peer, (unsigned) *len)))
    return -1;

  int res = -1;
  BOOL secret_check_failed = FALSE;
  BOOL in_progress = FALSE;
  sigframe thisframe (mainthread);

  fhandler_socket *sock = get (fd);
  if (sock)
    {
      /* Allows NULL peer and len parameters. */
      struct sockaddr_in peer_dummy;
      int len_dummy;
      if (!peer)
	peer = (struct sockaddr *) &peer_dummy;
      if (!len)
	{
	  len_dummy = sizeof (struct sockaddr_in);
	  len = &len_dummy;
	}

      /* accept on NT fails if len < sizeof (sockaddr_in)
       * some programs set len to
       * sizeof (name.sun_family) + strlen (name.sun_path) for UNIX domain
       */
      if (len && ((unsigned) *len < sizeof (struct sockaddr_in)))
	*len = sizeof (struct sockaddr_in);

      res = accept (sock->get_socket (), peer, len);  // can't use a blocking call inside a lock

      if ((SOCKET) res == (SOCKET) INVALID_SOCKET &&
	  WSAGetLastError () == WSAEWOULDBLOCK)
	in_progress = TRUE;

      if (sock->get_addr_family () == AF_LOCAL)
	{
	  if ((SOCKET) res != (SOCKET) INVALID_SOCKET || in_progress)
	    {
	      if (!sock->create_secret_event ())
		secret_check_failed = TRUE;
	      else if (in_progress)
		sock->signal_secret_event ();
	    }

	  if (!secret_check_failed &&
	      (SOCKET) res != (SOCKET) INVALID_SOCKET)
	    {
	      if (!sock->check_peer_secret_event ((struct sockaddr_in*) peer))
		{
		  debug_printf ("connect from unauthorized client");
		  secret_check_failed = TRUE;
		}
	    }

	  if (secret_check_failed)
	    {
	      sock->close_secret_event ();
	      if ((SOCKET) res != (SOCKET) INVALID_SOCKET)
		closesocket (res);
	      set_errno (ECONNABORTED);
	      res = -1;
	      goto done;
	    }
	}


      cygheap_fdnew res_fd;
      if (res_fd < 0)
	/* FIXME: what is correct errno? */;
      else if ((SOCKET) res == (SOCKET) INVALID_SOCKET)
	set_winsock_errno ();
      else
	{
	  fhandler_socket* res_fh = fdsock (res_fd, sock->get_name (), res);
	  if (sock->get_addr_family () == AF_LOCAL)
	    res_fh->set_sun_path (sock->get_sun_path ());
	  res_fh->set_addr_family (sock->get_addr_family ());
	  res = res_fd;
	}
    }
 done:
  syscall_printf ("%d = accept (%d, %x, %x)", res, fd, peer, len);
  return res;
}

/* exported as bind: standards? */
extern "C" int
cygwin_bind (int fd, const struct sockaddr *my_addr, int addrlen)
{
  if (__check_null_invalid_struct_errno (my_addr, addrlen))
    return -1;

  int res = -1;

  fhandler_socket *sock = get (fd);
  if (sock)
    {
      if (my_addr->sa_family == AF_LOCAL)
	{
#define un_addr ((struct sockaddr_un *) my_addr)
	  struct sockaddr_in sin;
	  int len = sizeof sin;
	  int fd;

	  if (strlen (un_addr->sun_path) >= UNIX_PATH_LEN)
	    {
	      set_errno (ENAMETOOLONG);
	      goto out;
	    }
	  sin.sin_family = AF_INET;
	  sin.sin_port = 0;
	  sin.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
	  if (bind (sock->get_socket (), (sockaddr *) &sin, len))
	    {
	      syscall_printf ("AF_LOCAL: bind failed %d", get_errno ());
	      set_winsock_errno ();
	      goto out;
	    }
	  if (getsockname (sock->get_socket (), (sockaddr *) &sin, &len))
	    {
	      syscall_printf ("AF_LOCAL: getsockname failed %d", get_errno ());
	      set_winsock_errno ();
	      goto out;
	    }

	  sin.sin_port = ntohs (sin.sin_port);
	  debug_printf ("AF_LOCAL: socket bound to port %u", sin.sin_port);

	  /* bind must fail if file system socket object already exists
	     so _open () is called with O_EXCL flag. */
	  fd = _open (un_addr->sun_path,
		      O_WRONLY | O_CREAT | O_EXCL | O_BINARY,
		      0);
	  if (fd < 0)
	    {
	      if (get_errno () == EEXIST)
		set_errno (EADDRINUSE);
	      goto out;
	    }

	  sock->set_connect_secret ();

	  char buf[sizeof (SOCKET_COOKIE) + 80];
	  __small_sprintf (buf, "%s%u ", SOCKET_COOKIE, sin.sin_port);
	  sock->get_connect_secret (strchr (buf, '\0'));
	  len = strlen (buf) + 1;

	  /* Note that the terminating nul is written.  */
	  if (_write (fd, buf, len) != len)
	    {
	      save_errno here;
	      _close (fd);
	      _unlink (un_addr->sun_path);
	    }
	  else
	    {
	      _close (fd);
	      chmod (un_addr->sun_path,
		(S_IFSOCK | S_IRWXU | S_IRWXG | S_IRWXO) & ~cygheap->umask);
	      sock->set_sun_path (un_addr->sun_path);
	      res = 0;
	    }
#undef un_addr
	}
      else if (bind (sock->get_socket (), my_addr, addrlen))
	set_winsock_errno ();
      else
	res = 0;
    }

out:
  syscall_printf ("%d = bind (%d, %x, %d)", res, fd, my_addr, addrlen);
  return res;
}

/* exported as getsockname: standards? */
extern "C" int
cygwin_getsockname (int fd, struct sockaddr *addr, int *namelen)
{
  if (check_null_invalid_struct_errno (namelen)
      || __check_null_invalid_struct_errno (addr, (unsigned) *namelen))
    return -1;

  int res = -1;

  fhandler_socket *sock = get (fd);
  if (sock)
    {
      if (sock->get_addr_family () == AF_LOCAL)
	{
	  struct sockaddr_un *sun = (struct sockaddr_un *) addr;
	  memset (sun, 0, *namelen);
	  sun->sun_family = AF_LOCAL;
	  /* According to SUSv2 "If the actual length of the address is greater
	     than the length of the supplied sockaddr structure, the stored
	     address will be truncated."  We play it save here so that the
	     path always has a trailing 0 even if it's truncated. */
	  strncpy (sun->sun_path, sock->get_sun_path (),
		   *namelen - sizeof *sun + sizeof sun->sun_path - 1);
	  *namelen = sizeof *sun - sizeof sun->sun_path
		     + strlen (sun->sun_path) + 1;
	  res = 0;
	}
      else
	{
	  res = getsockname (sock->get_socket (), addr, namelen);
	  if (res)
	    set_winsock_errno ();
	}
    }
  syscall_printf ("%d = getsockname (%d, %x, %d)", res, fd, addr, namelen);
  return res;
}

/* exported as listen: standards? */
extern "C" int
cygwin_listen (int fd, int backlog)
{
  int res = -1;


  fhandler_socket *sock = get (fd);
  if (sock)
    {
      res = listen (sock->get_socket (), backlog);
      if (res)
	set_winsock_errno ();
    }
  syscall_printf ("%d = listen (%d, %d)", res, fd, backlog);
  return res;
}

/* exported as shutdown: standards? */
extern "C" int
cygwin_shutdown (int fd, int how)
{
  int res = -1;
  sigframe thisframe (mainthread);

  fhandler_socket *sock = get (fd);
  if (sock)
    {
      res = shutdown (sock->get_socket (), how);
      if (res)
	set_winsock_errno ();
      else
	switch (how)
	  {
	  case SHUT_RD:
	    sock->set_shutdown_read ();
	    break;
	  case SHUT_WR:
	    sock->set_shutdown_write ();
	    break;
	  case SHUT_RDWR:
	    sock->set_shutdown_read ();
	    sock->set_shutdown_write ();
	    break;
	  }
    }
  syscall_printf ("%d = shutdown (%d, %d)", res, fd, how);
  return res;
}

/* exported as hstrerror: BSD 4.3  */
extern "C" const char *
cygwin_hstrerror (int err)
{
  int i;

  for (i = 0; host_errmap[i].e != 0; ++i)
    if (err == host_errmap[i].e)
      break;

  return host_errmap[i].s;
}

/* exported as herror: BSD 4.3  */
extern "C" void
cygwin_herror (const char *s)
{
  if (s && check_null_str (s))
    return;
  if (cygheap->fdtab.not_open (2))
    return;

  if (s)
    {
      write (2, s, strlen (s));
      write (2, ": ", 2);
    }

  const char *h_errstr = cygwin_hstrerror (h_errno);

  if (!h_errstr)
    switch (h_errno)
      {
      case NETDB_INTERNAL:
	h_errstr = "Resolver internal error";
	break;
      case NETDB_SUCCESS:
	h_errstr = "Resolver error 0 (no error)";
	break;
      default:
	h_errstr = "Unknown resolver error";
	break;
      }
  write (2, h_errstr, strlen (h_errstr));
  write (2, "\n", 1);
}

/* exported as getpeername: standards? */
extern "C" int
cygwin_getpeername (int fd, struct sockaddr *name, int *len)
{
  int res;
  if (check_null_invalid_struct_errno (len)
      || __check_null_invalid_struct_errno (name, (unsigned) *len))
    return -1;

  fhandler_socket *h = get (fd);

  if (!h)
    res = -1;
  else
    {
      res = getpeername (h->get_socket (), name, len);
      if (res)
	set_winsock_errno ();
    }

  debug_printf ("%d = getpeername %d", res, h->get_socket ());
  return res;
}

/* exported as recv: standards? */
extern "C" int
cygwin_recv (int fd, void *buf, int len, unsigned int flags)
{
  int res;
  wsock_event wsock_evt;
  LPWSAOVERLAPPED ovr;
  fhandler_socket *h = get (fd);

  if (__check_null_invalid_struct_errno (buf, len) || !h)
    res = -1;
  else
    {
      sigframe thisframe (mainthread);

      if (h->is_nonblocking () || !(ovr = wsock_evt.prepare ()))
	{
	  debug_printf ("Fallback to winsock 1 recv call");
	  if ((res = recv (h->get_socket (), (char *) buf, len, flags))
	      == SOCKET_ERROR)
	    {
	      set_winsock_errno ();
	      res = -1;
	    }
	}
      else
	{
	  WSABUF wsabuf = { len, (char *) buf };
	  DWORD ret = 0;
	  if (WSARecv (h->get_socket (), &wsabuf, 1, &ret, (DWORD *)&flags,
		       ovr, NULL) != SOCKET_ERROR)
	    res = ret;
	  else if ((res = WSAGetLastError ()) != WSA_IO_PENDING)
	    {
	      set_winsock_errno ();
	      res = -1;
	    }
	  else if ((res = wsock_evt.wait (h->get_socket (), (DWORD *)&flags)) == -1)
	    set_winsock_errno ();
	}
    }

  syscall_printf ("%d = recv (%d, %x, %x, %x)", res, fd, buf, len, flags);

  return res;
}

/* exported as send: standards? */
extern "C" int
cygwin_send (int fd, const void *buf, int len, unsigned int flags)
{
  int res;
  wsock_event wsock_evt;
  LPWSAOVERLAPPED ovr;
  fhandler_socket *h = get (fd);

  if (__check_invalid_read_ptr_errno (buf, len) || !h)
    res = -1;
  else
    {
      sigframe thisframe (mainthread);

      if (h->is_nonblocking () || !(ovr = wsock_evt.prepare ()))
	{
	  debug_printf ("Fallback to winsock 1 send call");
	  if ((res = send (h->get_socket (), (const char *) buf, len, flags))
	      == SOCKET_ERROR)
	    {
	      set_winsock_errno ();
	      res = -1;
	    }
	}
      else
	{
	  WSABUF wsabuf = { len, (char *) buf };
	  DWORD ret = 0;
	  if (WSASend (h->get_socket (), &wsabuf, 1, &ret, (DWORD)flags,
		       ovr, NULL) != SOCKET_ERROR)
	    res = ret;
	  else if ((res = WSAGetLastError ()) != WSA_IO_PENDING)
	    {
	      set_winsock_errno ();
	      res = -1;
	    }
	  else if ((res = wsock_evt.wait (h->get_socket (), (DWORD *)&flags)) == -1)
	    set_winsock_errno ();
	}
    }

  syscall_printf ("%d = send (%d, %x, %d, %x)", res, fd, buf, len, flags);

  return res;
}

/* getdomainname: standards? */
extern "C" int
getdomainname (char *domain, int len)
{
  /*
   * This works for Win95 only if the machine is configured to use MS-TCP.
   * If a third-party TCP is being used this will fail.
   * FIXME: On Win95, is there a way to portably check the TCP stack
   * in use and include paths for the Domain name in each ?
   * Punt for now and assume MS-TCP on Win95.
   */
  if (__check_null_invalid_struct_errno (domain, len))
    return -1;

  reg_key r (HKEY_LOCAL_MACHINE, KEY_READ,
	     (!wincap.is_winnt ()) ? "System" : "SYSTEM",
	     "CurrentControlSet", "Services",
	     (!wincap.is_winnt ()) ? "MSTCP" : "Tcpip",
	     NULL);

  /* FIXME: Are registry keys case sensitive? */
  if (r.error () || r.get_string ("Domain", domain, len, "") != ERROR_SUCCESS)
    {
      __seterrno ();
      return -1;
    }

  return 0;
}

/* Cygwin internal */
/* Fill out an ifconf struct. */

/*
 * IFCONF 98/ME, NTSP4, W2K:
 * Use IP Helper Library
 */
static void
get_2k_ifconf (struct ifconf *ifc, int what)
{
  int cnt = 0;
  char eth[2] = "/", ppp[2] = "/", slp[2] = "/", sub[2] = "0";

  /* Union maps buffer to correct struct */
  struct ifreq *ifr = ifc->ifc_req;

  DWORD if_cnt, ip_cnt, lip, lnp;
  DWORD siz_if_table = 0;
  DWORD siz_ip_table = 0;
  PMIB_IFTABLE ift;
  PMIB_IPADDRTABLE ipt;
  struct sockaddr_in *sa = NULL;
  struct sockaddr *so = NULL;

  if (GetIfTable(NULL, &siz_if_table, TRUE) == ERROR_INSUFFICIENT_BUFFER &&
      GetIpAddrTable(NULL, &siz_ip_table, TRUE) == ERROR_INSUFFICIENT_BUFFER &&
      (ift = (PMIB_IFTABLE) alloca (siz_if_table)) &&
      (ipt = (PMIB_IPADDRTABLE) alloca (siz_ip_table)) &&
      !GetIfTable(ift, &siz_if_table, TRUE) &&
      !GetIpAddrTable(ipt, &siz_ip_table, TRUE))
    {
      /* Iterate over all known interfaces */
      for (if_cnt = 0; if_cnt < ift->dwNumEntries; ++if_cnt)
	{
	  *sub = '0';
	  /* Iterate over all configured IP-addresses */
	  for (ip_cnt = 0; ip_cnt < ipt->dwNumEntries; ++ip_cnt)
	    {
	      /* Does the IP address belong to the interface? */
	      if (ipt->table[ip_cnt].dwIndex == ift->table[if_cnt].dwIndex)
		{
		  /* Setup the interface name */
		  switch (ift->table[if_cnt].dwType)
		    {
		      case MIB_IF_TYPE_ETHERNET:
			if (*sub == '0')
			  ++*eth;
			strcpy (ifr->ifr_name, "eth");
			strcat (ifr->ifr_name, eth);
			break;
		      case MIB_IF_TYPE_PPP:
			++*ppp;
			strcpy (ifr->ifr_name, "ppp");
			strcat (ifr->ifr_name, ppp);
			break;
		      case MIB_IF_TYPE_SLIP:
			++*slp;
			strcpy (ifr->ifr_name, "slp");
			strcat (ifr->ifr_name, slp);
			break;
		      case MIB_IF_TYPE_LOOPBACK:
			strcpy (ifr->ifr_name, "lo");
			break;
		      default:
			continue;
		    }
		  if (*sub > '0')
		    {
		      strcat (ifr->ifr_name, ":");
		      strcat (ifr->ifr_name, sub);
		    }
		  ++*sub;
		  /* setup sockaddr struct */
		  switch (what)
		    {
		      case SIOCGIFCONF:
		      case SIOCGIFADDR:
			sa = (struct sockaddr_in *) &ifr->ifr_addr;
			sa->sin_addr.s_addr = ipt->table[ip_cnt].dwAddr;
			sa->sin_family = AF_INET;
			sa->sin_port = 0;
			break;
		      case SIOCGIFBRDADDR:
			sa = (struct sockaddr_in *) &ifr->ifr_broadaddr;
#if 0
			/* Unfortunately, the field returns only crap. */
			sa->sin_addr.s_addr = ipt->table[ip_cnt].dwBCastAddr;
#else
			lip = ipt->table[ip_cnt].dwAddr;
			lnp = ipt->table[ip_cnt].dwMask;
			sa->sin_addr.s_addr = lip & lnp | ~lnp;
			sa->sin_family = AF_INET;
			sa->sin_port = 0;
#endif
			break;
		      case SIOCGIFNETMASK:
			sa = (struct sockaddr_in *) &ifr->ifr_netmask;
			sa->sin_addr.s_addr = ipt->table[ip_cnt].dwMask;
			sa->sin_family = AF_INET;
			sa->sin_port = 0;
			break;
		      case SIOCGIFHWADDR:
			so = &ifr->ifr_hwaddr;
			for (UINT i = 0; i < IFHWADDRLEN; ++i)
			  if (i >= ift->table[if_cnt].dwPhysAddrLen)
			    so->sa_data[i] = '\0';
			  else
			    so->sa_data[i] = ift->table[if_cnt].bPhysAddr[i];
			so->sa_family = AF_INET;
			break;
		      case SIOCGIFMETRIC:
			ifr->ifr_metric = 1;
			break;
		      case SIOCGIFMTU:
			ifr->ifr_mtu = ift->table[if_cnt].dwMtu;
			break;
		    }
		  ++cnt;
		  if ((caddr_t) ++ifr >
		      ifc->ifc_buf + ifc->ifc_len - sizeof (struct ifreq))
		    goto done;
		}
	    }
	}
    }
done:
  /* Set the correct length */
  ifc->ifc_len = cnt * sizeof (struct ifreq);
}

/*
 * IFCONF Windows NT < SP4:
 * Look at the Bind value in
 * HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Linkage\
 * This is a REG_MULTI_SZ with strings of the form:
 * \Device\<Netcard>, where netcard is the name of the net device.
 * Then look under:
 * HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\<NetCard>\
 *							Parameters\Tcpip
 * at the IPAddress, Subnetmask and DefaultGateway values for the
 * required values.
 */
static void
get_nt_ifconf (struct ifconf *ifc, int what)
{
  HKEY key;
  unsigned long lip, lnp;
  struct sockaddr_in *sa = NULL;
  struct sockaddr *so = NULL;
  DWORD size;
  int cnt = 1;
  char *binding = (char *) 0;

  /* Union maps buffer to correct struct */
  struct ifreq *ifr = ifc->ifc_req;

  if (RegOpenKeyEx (HKEY_LOCAL_MACHINE,
		    "SYSTEM\\"
		    "CurrentControlSet\\"
		    "Services\\"
		    "Tcpip\\"
		    "Linkage",
		    0, KEY_READ, &key) == ERROR_SUCCESS)
    {
      if (RegQueryValueEx (key, "Bind",
			   NULL, NULL,
			   NULL, &size) == ERROR_SUCCESS)
	{
	  binding = (char *) alloca (size);
	  if (RegQueryValueEx (key, "Bind",
			       NULL, NULL,
			       (unsigned char *) binding,
			       &size) != ERROR_SUCCESS)
	    {
	      binding = NULL;
	    }
	}
      RegCloseKey (key);
    }

  if (binding)
    {
      char *bp, eth[2] = "/";
      char cardkey[256], ipaddress[256], netmask[256];

      for (bp = binding; *bp; bp += strlen (bp) + 1)
	{
	  bp += strlen ("\\Device\\");
	  strcpy (cardkey, "SYSTEM\\CurrentControlSet\\Services\\");
	  strcat (cardkey, bp);
	  strcat (cardkey, "\\Parameters\\Tcpip");

	  if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, cardkey,
			    0, KEY_READ, &key) != ERROR_SUCCESS)
	    continue;

	  if (RegQueryValueEx (key, "IPAddress",
			       NULL, NULL,
			       (unsigned char *) ipaddress,
			       (size = 256, &size)) == ERROR_SUCCESS
	      && RegQueryValueEx (key, "SubnetMask",
				  NULL, NULL,
				  (unsigned char *) netmask,
				  (size = 256, &size)) == ERROR_SUCCESS)
	    {
	      char *ip, *np;
	      char dhcpaddress[256], dhcpnetmask[256];

	      for (ip = ipaddress, np = netmask;
		   *ip && *np;
		   ip += strlen (ip) + 1, np += strlen (np) + 1)
		{
		  if ((caddr_t) ++ifr > ifc->ifc_buf
		      + ifc->ifc_len
		      - sizeof (struct ifreq))
		    break;

		  if (! strncmp (bp, "NdisWan", 7))
		    {
		      strcpy (ifr->ifr_name, "ppp");
		      strcat (ifr->ifr_name, bp + 7);
		    }
		  else
		    {
		      ++*eth;
		      strcpy (ifr->ifr_name, "eth");
		      strcat (ifr->ifr_name, eth);
		    }
		  memset (&ifr->ifr_addr, '\0', sizeof ifr->ifr_addr);
		  if (cygwin_inet_addr (ip) == 0L
		      && RegQueryValueEx (key, "DhcpIPAddress",
					  NULL, NULL,
					  (unsigned char *) dhcpaddress,
					  (size = 256, &size))
		      == ERROR_SUCCESS
		      && RegQueryValueEx (key, "DhcpSubnetMask",
					  NULL, NULL,
					  (unsigned char *) dhcpnetmask,
					  (size = 256, &size))
		      == ERROR_SUCCESS)
		    {
		      switch (what)
			{
			case SIOCGIFCONF:
			case SIOCGIFADDR:
			  sa = (struct sockaddr_in *) &ifr->ifr_addr;
			  sa->sin_addr.s_addr = cygwin_inet_addr (dhcpaddress);
			  sa->sin_family = AF_INET;
			  sa->sin_port = 0;
			  break;
			case SIOCGIFBRDADDR:
			  lip = cygwin_inet_addr (dhcpaddress);
			  lnp = cygwin_inet_addr (dhcpnetmask);
			  sa = (struct sockaddr_in *) &ifr->ifr_broadaddr;
			  sa->sin_addr.s_addr = lip & lnp | ~lnp;
			  sa->sin_family = AF_INET;
			  sa->sin_port = 0;
			  break;
			case SIOCGIFNETMASK:
			  sa = (struct sockaddr_in *) &ifr->ifr_netmask;
			  sa->sin_addr.s_addr =
			    cygwin_inet_addr (dhcpnetmask);
			  sa->sin_family = AF_INET;
			  sa->sin_port = 0;
			  break;
			case SIOCGIFHWADDR:
			  so = &ifr->ifr_hwaddr;
			  memset (so->sa_data, 0, IFHWADDRLEN);
			  so->sa_family = AF_INET;
			  break;
			case SIOCGIFMETRIC:
			  ifr->ifr_metric = 1;
			  break;
			case SIOCGIFMTU:
			  ifr->ifr_mtu = 1500;
			  break;
			}
		    }
		  else
		    {
		      switch (what)
			{
			case SIOCGIFCONF:
			case SIOCGIFADDR:
			  sa = (struct sockaddr_in *) &ifr->ifr_addr;
			  sa->sin_addr.s_addr = cygwin_inet_addr (ip);
			  sa->sin_family = AF_INET;
			  sa->sin_port = 0;
			  break;
			case SIOCGIFBRDADDR:
			  lip = cygwin_inet_addr (ip);
			  lnp = cygwin_inet_addr (np);
			  sa = (struct sockaddr_in *) &ifr->ifr_broadaddr;
			  sa->sin_addr.s_addr = lip & lnp | ~lnp;
			  sa->sin_family = AF_INET;
			  sa->sin_port = 0;
			  break;
			case SIOCGIFNETMASK:
			  sa = (struct sockaddr_in *) &ifr->ifr_netmask;
			  sa->sin_addr.s_addr = cygwin_inet_addr (np);
			  sa->sin_family = AF_INET;
			  sa->sin_port = 0;
			  break;
			case SIOCGIFHWADDR:
			  so = &ifr->ifr_hwaddr;
			  memset (so->sa_data, 0, IFHWADDRLEN);
			  so->sa_family = AF_INET;
			  break;
			case SIOCGIFMETRIC:
			  ifr->ifr_metric = 1;
			  break;
			case SIOCGIFMTU:
			  ifr->ifr_mtu = 1500;
			  break;
			}
		    }
		  ++cnt;
		}
	    }
	  RegCloseKey (key);
	}
    }

  /* Set the correct length */
  ifc->ifc_len = cnt * sizeof (struct ifreq);
}

/*
 * IFCONF Windows 95:
 * HKLM/Enum/Network/MSTCP/"*"
 *	  -> Value "Driver" enth<EFBFBD>lt Subkey relativ zu
 *	    HKLM/System/CurrentControlSet/Class/
 *	  -> In Subkey "Bindings" die Values aufz<EFBFBD>hlen
 *	    -> Enth<EFBFBD>lt Subkeys der Form "VREDIR\*"
 *	       Das * ist ein Subkey relativ zu
 *	       HKLM/System/CurrentControlSet/Class/Net/
 * HKLM/System/CurrentControlSet/Class/"Driver"
 *	  -> Value "IPAddress"
 *	  -> Value "IPMask"
 * HKLM/System/CurrentControlSet/Class/Net/"*"(aus "VREDIR\*")
 *	  -> Wenn Value "AdapterName" == "MS$PPP" -> ppp interface
 *	  -> Value "DriverDesc" enth<EFBFBD>lt den Namen
 *
 */
static void
get_95_ifconf (struct ifconf *ifc, int what)
{
  HKEY key;
  unsigned long lip, lnp;
  struct sockaddr_in *sa = NULL;
  struct sockaddr *so = NULL;
  FILETIME update;
  LONG res;
  DWORD size;
  int cnt = 1;
  char ifname[256];
  char eth[2] = "/";
  char ppp[2] = "/";

  /* Union maps buffer to correct struct */
  struct ifreq *ifr = ifc->ifc_req;

  if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, "Enum\\Network\\MSTCP",
		    0, KEY_READ, &key) != ERROR_SUCCESS)
    {
      /* Set the correct length */
      ifc->ifc_len = cnt * sizeof (struct ifreq);
      return;
    }

  for (int i = 0;
       (res = RegEnumKeyEx (key, i, ifname,
			    (size = sizeof ifname, &size),
			    0, 0, 0, &update)) != ERROR_NO_MORE_ITEMS;
       ++i)
    {
      HKEY ifkey, subkey;
      char driver[256], classname[256], netname[256];
      char adapter[256], ip[256], np[256];

      if (res != ERROR_SUCCESS
	  || RegOpenKeyEx (key, ifname, 0,
			   KEY_READ, &ifkey) != ERROR_SUCCESS)
	continue;

      if (RegQueryValueEx (ifkey, "Driver", 0,
			   NULL, (unsigned char *) driver,
			   (size = sizeof driver, &size)) != ERROR_SUCCESS)
	{
	  RegCloseKey (ifkey);
	  continue;
	}

      strcpy (classname, "System\\CurrentControlSet\\Services\\Class\\");
      strcat (classname, driver);
      if ((res = RegOpenKeyEx (HKEY_LOCAL_MACHINE, classname,
			       0, KEY_READ, &subkey)) != ERROR_SUCCESS)
	{
	  RegCloseKey (ifkey);
	  continue;
	}

      if (RegQueryValueEx (subkey, "IPAddress", 0,
			   NULL, (unsigned char *) ip,
			   (size = sizeof ip, &size)) == ERROR_SUCCESS
	  && RegQueryValueEx (subkey, "IPMask", 0,
			      NULL, (unsigned char *) np,
			      (size = sizeof np, &size)) == ERROR_SUCCESS)
	{
	  if ((caddr_t)++ifr > ifc->ifc_buf
	      + ifc->ifc_len
	      - sizeof (struct ifreq))
	    goto out;

	  switch (what)
	    {
	    case SIOCGIFCONF:
	    case SIOCGIFADDR:
	      sa = (struct sockaddr_in *) &ifr->ifr_addr;
	      sa->sin_addr.s_addr = cygwin_inet_addr (ip);
	      sa->sin_family = AF_INET;
	      sa->sin_port = 0;
	      break;
	    case SIOCGIFBRDADDR:
	      lip = cygwin_inet_addr (ip);
	      lnp = cygwin_inet_addr (np);
	      sa = (struct sockaddr_in *) &ifr->ifr_broadaddr;
	      sa->sin_addr.s_addr = lip & lnp | ~lnp;
	      sa->sin_family = AF_INET;
	      sa->sin_port = 0;
	      break;
	    case SIOCGIFNETMASK:
	      sa = (struct sockaddr_in *) &ifr->ifr_netmask;
	      sa->sin_addr.s_addr = cygwin_inet_addr (np);
	      sa->sin_family = AF_INET;
	      sa->sin_port = 0;
	      break;
	    case SIOCGIFHWADDR:
	      so = &ifr->ifr_hwaddr;
	      memset (so->sa_data, 0, IFHWADDRLEN);
	      so->sa_family = AF_INET;
	      break;
	    case SIOCGIFMETRIC:
	      ifr->ifr_metric = 1;
	      break;
	    case SIOCGIFMTU:
	      ifr->ifr_mtu = 1500;
	      break;
	    }
	}

      RegCloseKey (subkey);

      strcpy (netname, "System\\CurrentControlSet\\Services\\Class\\Net\\");
      strcat (netname, ifname);

      if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, netname,
		  0, KEY_READ, &subkey) != ERROR_SUCCESS)
      {
	  RegCloseKey (ifkey);
	  --ifr;
	  continue;
      }

      if (RegQueryValueEx (subkey, "AdapterName", 0,
		  NULL, (unsigned char *) adapter,
		  (size = sizeof adapter, &size)) == ERROR_SUCCESS
	      && strcasematch (adapter, "MS$PPP"))
      {
	  ++*ppp;
	  strcpy (ifr->ifr_name, "ppp");
	  strcat (ifr->ifr_name, ppp);
      }
      else
      {
	  ++*eth;
	  strcpy (ifr->ifr_name, "eth");
	  strcat (ifr->ifr_name, eth);
      }

      RegCloseKey (subkey);
      RegCloseKey (ifkey);

      ++cnt;
    }

out:

  RegCloseKey (key);

  /* Set the correct length */
  ifc->ifc_len = cnt * sizeof (struct ifreq);
}

int
get_ifconf (struct ifconf *ifc, int what)
{
  unsigned long lip, lnp;
  struct sockaddr_in *sa;

  if (check_null_invalid_struct_errno (ifc))
    return -1;

  /* Union maps buffer to correct struct */
  struct ifreq *ifr = ifc->ifc_req;

  /* Ensure we have space for two struct ifreqs, fail if not. */
  if (ifc->ifc_len < (int) (2 * sizeof (struct ifreq)))
    {
      set_errno (EFAULT);
      return -1;
    }

  /* Set up interface lo0 first */
  strcpy (ifr->ifr_name, "lo");
  memset (&ifr->ifr_addr, '\0', sizeof (ifr->ifr_addr));
  switch (what)
    {
    case SIOCGIFCONF:
    case SIOCGIFADDR:
      sa = (struct sockaddr_in *) &ifr->ifr_addr;
      sa->sin_addr.s_addr = htonl (INADDR_LOOPBACK);
      sa->sin_family = AF_INET;
      sa->sin_port = 0;
      break;
    case SIOCGIFBRDADDR:
      lip = htonl (INADDR_LOOPBACK);
      lnp = cygwin_inet_addr ("255.0.0.0");
      sa = (struct sockaddr_in *) &ifr->ifr_broadaddr;
      sa->sin_addr.s_addr = lip & lnp | ~lnp;
      sa->sin_family = AF_INET;
      sa->sin_port = 0;
      break;
    case SIOCGIFNETMASK:
      sa = (struct sockaddr_in *) &ifr->ifr_netmask;
      sa->sin_addr.s_addr = cygwin_inet_addr ("255.0.0.0");
      sa->sin_family = AF_INET;
      sa->sin_port = 0;
      break;
    case SIOCGIFHWADDR:
      ifr->ifr_hwaddr.sa_family = AF_INET;
      memset (ifr->ifr_hwaddr.sa_data, 0, IFHWADDRLEN);
      break;
    case SIOCGIFMETRIC:
      ifr->ifr_metric = 1;
      break;
    case SIOCGIFMTU:
      /* This funny value is returned by `ifconfig lo' on Linux 2.2 kernel. */
      ifr->ifr_mtu = 3924;
      break;
    default:
      set_errno (EINVAL);
      return -1;
    }

  OSVERSIONINFO os_version_info;
  memset (&os_version_info, 0, sizeof os_version_info);
  os_version_info.dwOSVersionInfoSize = sizeof (OSVERSIONINFO);
  GetVersionEx (&os_version_info);
  if (wincap.has_ip_helper_lib ())
    get_2k_ifconf (ifc, what);
  else if (wincap.is_winnt ())
    get_nt_ifconf (ifc, what);
  else
    get_95_ifconf (ifc, what);
  return 0;
}

/* exported as rcmd: standards? */
extern "C" int
cygwin_rcmd (char **ahost, unsigned short inport, char *locuser,
	       char *remuser, char *cmd, int *fd2p)
{
  int res = -1;
  SOCKET fd2s;
  sigframe thisframe (mainthread);

  if (check_null_invalid_struct_errno (ahost) ||
      check_null_empty_str_errno (*ahost) ||
      (locuser && check_null_empty_str_errno (locuser)) ||
      (remuser && check_null_str_errno (remuser)))
    return (int) INVALID_SOCKET;

  cygheap_fdnew res_fd;
  if (res_fd < 0)
    goto done;

  if (fd2p)
    {
      cygheap_fdnew newfd (res_fd, false);
      if (*fd2p < 0)
	goto done;
      *fd2p = newfd;
    }

  res = rcmd (ahost, inport, locuser, remuser, cmd, fd2p ? &fd2s : NULL);
  if (res == (int) INVALID_SOCKET)
    goto done;
  else
    {
      fdsock (res_fd, "/dev/tcp", res);
      res = res_fd;
    }

  if (fd2p)
    fdsock (*fd2p, "/dev/tcp", fd2s);

done:
  syscall_printf ("%d = rcmd (...)", res);
  return res;
}

/* exported as rresvport: standards? */
extern "C" int
cygwin_rresvport (int *port)
{
  int res;
  sigframe thisframe (mainthread);

  if (check_null_invalid_struct_errno (port))
    return -1;

  cygheap_fdnew res_fd;
  if (res_fd < 0)
    res = -1;
  else
    {
      res = rresvport (port);

      if (res != (int) INVALID_SOCKET)
	{
	  fdsock (res_fd, "/dev/tcp", res);
	  res = res_fd;
	}
    }

  syscall_printf ("%d = rresvport (%d)", res, port ? *port : 0);
  return res;
}

/* exported as rexec: standards? */
extern "C" int
cygwin_rexec (char **ahost, unsigned short inport, char *locuser,
	       char *password, char *cmd, int *fd2p)
{
  int res = -1;
  SOCKET fd2s;
  sigframe thisframe (mainthread);

  if (check_null_invalid_struct_errno (ahost) ||
      check_null_empty_str_errno (*ahost) ||
      (locuser && check_null_empty_str_errno (locuser)) ||
      (password && check_null_str_errno (password)))
    return (int) INVALID_SOCKET;

  cygheap_fdnew res_fd;
  if (res_fd < 0)
    goto done;
  if (fd2p)
    {
      cygheap_fdnew newfd (res_fd);
      if (newfd < 0)
	goto done;
      *fd2p = newfd;
    }
  res = rexec (ahost, inport, locuser, password, cmd, fd2p ? &fd2s : NULL);
  if (res == (int) INVALID_SOCKET)
    goto done;
  else
    {
      fdsock (res_fd, "/dev/tcp", res);
      res = res_fd;
    }
  if (fd2p)
    fdsock (*fd2p, "/dev/tcp", fd2s);

done:
  syscall_printf ("%d = rexec (...)", res);
  return res;
}

/* socketpair: standards? */
/* Win32 supports AF_INET only, so ignore domain and protocol arguments */
extern "C" int
socketpair (int family, int type, int protocol, int *sb)
{
  int res = -1;
  SOCKET insock, outsock, newsock;
  struct sockaddr_in sock_in, sock_out;
  int len;
  cygheap_fdnew sb0;

  if (__check_null_invalid_struct_errno (sb, 2 * sizeof(int)))
    return -1;

  if (family != AF_LOCAL && family != AF_INET)
    {
      set_errno (EAFNOSUPPORT);
      goto done;
    }
  if (type != SOCK_STREAM && type != SOCK_DGRAM)
    {
      set_errno (EPROTOTYPE);
      goto done;
    }
  if ((family == AF_LOCAL && protocol != PF_UNSPEC && protocol != PF_LOCAL)
      || (family == AF_INET && protocol != PF_UNSPEC && protocol != PF_INET))
    {
      set_errno (EPROTONOSUPPORT);
      goto done;
    }

  if (sb0 < 0)
    goto done;
  else
    {
      sb[0] = sb0;
      cygheap_fdnew sb1 (sb0, false);
      if (sb1 < 0)
	goto done;

      sb[1] = sb1;
    }

  /* create the first socket */
  newsock = socket (AF_INET, type, 0);
  if (newsock == INVALID_SOCKET)
    {
      debug_printf ("first socket call failed");
      set_winsock_errno ();
      goto done;
    }

  /* bind the socket to any unused port */
  sock_in.sin_family = AF_INET;
  sock_in.sin_port = 0;
  sock_in.sin_addr.s_addr = INADDR_ANY;
  if (bind (newsock, (struct sockaddr *) &sock_in, sizeof (sock_in)) < 0)
    {
      debug_printf ("bind failed");
      set_winsock_errno ();
      closesocket (newsock);
      goto done;
    }
  len = sizeof (sock_in);
  if (getsockname (newsock, (struct sockaddr *) &sock_in, &len) < 0)
    {
      debug_printf ("getsockname error");
      set_winsock_errno ();
      closesocket (newsock);
      goto done;
    }

  /* For stream sockets, create a listener */
  if (type == SOCK_STREAM)
    listen (newsock, 2);

  /* create a connecting socket */
  outsock = socket (AF_INET, type, 0);
  if (outsock == INVALID_SOCKET)
    {
      debug_printf ("second socket call failed");
      set_winsock_errno ();
      closesocket (newsock);
      goto done;
    }

  /* For datagram sockets, bind the 2nd socket to an unused address, too */
  if (type == SOCK_DGRAM)
    {
      sock_out.sin_family = AF_INET;
      sock_out.sin_port = 0;
      sock_out.sin_addr.s_addr = INADDR_ANY;
      if (bind (outsock, (struct sockaddr *) &sock_out, sizeof (sock_out)) < 0)
	{
	  debug_printf ("bind failed");
	  set_winsock_errno ();
	  closesocket (newsock);
	  closesocket (outsock);
	  goto done;
	}
      len = sizeof (sock_out);
      if (getsockname (outsock, (struct sockaddr *) &sock_out, &len) < 0)
	{
	  debug_printf ("getsockname error");
	  set_winsock_errno ();
	  closesocket (newsock);
	  closesocket (outsock);
	  goto done;
	}
    }

  /* Force IP address to loopback */
  sock_in.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
  if (type == SOCK_DGRAM)
    sock_out.sin_addr.s_addr = htonl (INADDR_LOOPBACK);

  /* Do a connect */
  if (connect (outsock, (struct sockaddr *) &sock_in,
					   sizeof (sock_in)) < 0)
    {
      debug_printf ("connect error");
      set_winsock_errno ();
      closesocket (newsock);
      closesocket (outsock);
      goto done;
    }

  if (type == SOCK_STREAM)
    {
      /* For stream sockets, accept the connection and close the listener */
      len = sizeof (sock_in);
      insock = accept (newsock, (struct sockaddr *) &sock_in, &len);
      if (insock == INVALID_SOCKET)
	{
	  debug_printf ("accept error");
	  set_winsock_errno ();
	  closesocket (newsock);
	  closesocket (outsock);
	  goto done;
	}
      closesocket (newsock);
    }
  else
    {
      /* For datagram sockets, connect the 2nd socket */
      if (connect (newsock, (struct sockaddr *) &sock_out,
					       sizeof (sock_out)) < 0)
	{
	  debug_printf ("connect error");
	  set_winsock_errno ();
	  closesocket (newsock);
	  closesocket (outsock);
	  goto done;
	}
      insock = newsock;
    }

  res = 0;

  if (family == AF_LOCAL)
    {
      fhandler_socket *fh;

      fh = fdsock (sb[0],
		   type == SOCK_STREAM ? "/dev/streamsocket" : "/dev/dgsocket",
		   insock);
      fh->set_sun_path ("");
      fh->set_addr_family (AF_LOCAL);
      fh = fdsock (sb[1],
		   type == SOCK_STREAM ? "/dev/streamsocket" : "/dev/dgsocket",
		   outsock);
      fh->set_sun_path ("");
      fh->set_addr_family (AF_LOCAL);
    }
  else
    {
      fdsock (sb[0], type == SOCK_STREAM ? "/dev/tcp" : "/dev/udp",
	      insock)->set_addr_family (AF_INET);
      fdsock (sb[1], type == SOCK_STREAM ? "/dev/tcp" : "/dev/udp",
	      outsock)->set_addr_family (AF_INET);
    }

done:
  syscall_printf ("%d = socketpair (...)", res);
  return res;
}

/* sethostent: standards? */
extern "C" void
sethostent (int)
{
}

/* endhostent: standards? */
extern "C" void
endhostent (void)
{
}

/* exported as recvmsg: standards? */
extern "C" int 
cygwin_recvmsg(int s, struct msghdr *msg, int flags)
{
    int ret, nb;
    size_t tot = 0;
    int i;
    char *buf, *p;
    struct iovec *iov = msg->msg_iov;

    for(i = 0; i < msg->msg_iovlen; ++i)
	tot += iov[i].iov_len;
    buf = (char *) malloc(tot);
    if (tot != 0 && buf == NULL) {
	errno = ENOMEM;
	return -1;
    }
    nb = ret = cygwin_recvfrom (s, buf, tot, flags, 
      (struct sockaddr *) msg->msg_name, (int *) &msg->msg_namelen);
    p = buf;
    while (nb > 0) {
	ssize_t cnt = min(nb, iov->iov_len);

	memcpy (iov->iov_base, p, cnt);
	p += cnt;
	nb -= cnt;
	++iov;
    }
    free(buf);
    return ret;
}

/* exported as sendmsg: standards? */
extern "C" int
cygwin_sendmsg(int s, const struct msghdr *msg, int flags)
{
    int ret;
    size_t tot = 0;
    int i;
    char *buf, *p;
    struct iovec *iov = msg->msg_iov;

    for(i = 0; i < msg->msg_iovlen; ++i)
	tot += iov[i].iov_len;
    buf = (char *) malloc(tot);
    if (tot != 0 && buf == NULL) {
	errno = ENOMEM;
	return -1;
    }
    p = buf;
    for (i = 0; i < msg->msg_iovlen; ++i) {
	memcpy (p, iov[i].iov_base, iov[i].iov_len);
	p += iov[i].iov_len;
    }
    ret = cygwin_sendto (s, buf, tot, flags, 
      (struct sockaddr *) msg->msg_name, msg->msg_namelen);
    free (buf);
    return ret;
}