/* Copyright (C) 1994, 1997, 1999, 2001, 2002 Free Software Foundation, Inc.   This file is part of the GNU C Library.   The GNU C Library is free software; you can redistribute it and/or   modify it under the terms of the GNU Lesser General Public   License as published by the Free Software Foundation; either   version 2.1 of the License, or (at your option) any later version.   The GNU C Library is distributed in the hope that it will be useful,   but WITHOUT ANY WARRANTY; without even the implied warranty of   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU   Lesser General Public License for more details.   You should have received a copy of the GNU Lesser General Public   License along with the GNU C Library; if not, write to the Free   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA   02111-1307 USA.  */#include <errno.h>#include <string.h>#include <sys/socket.h>#include <hurd.h>#include <hurd/fd.h>#include <hurd/socket.h>/* Read N bytes into BUF through socket FD.   If ADDR is not NULL, fill in *ADDR_LEN bytes of it with tha address of   the sender, and store the actual size of the address in *ADDR_LEN.   Returns the number of bytes read or -1 for errors.  */ssize_t__recvfrom (fd, buf, n, flags, addrarg, addr_len)     int fd;     void *buf;     size_t n;     int flags;     __SOCKADDR_ARG addrarg;     socklen_t *addr_len;{  error_t err;  mach_port_t addrport;  char *bufp = buf;  mach_msg_type_number_t nread = n;  mach_port_t *ports;  mach_msg_type_number_t nports;  char *cdata = NULL;  mach_msg_type_number_t clen = 0;  struct sockaddr *addr = addrarg.__sockaddr__;  if (err = HURD_DPORT_USE (fd, __socket_recv (port, &addrport,					       flags, &bufp, &nread,					       &ports, &nports,					       &cdata, &clen,					       &flags,					       n)))    return __hurd_dfail (fd, err);  /* Get address data for the returned address port if requested.  */  if (addr != NULL)    {      char *buf = (char *) addr;      mach_msg_type_number_t buflen = *addr_len;      int type;      err = __socket_whatis_address (addrport, &type, &buf, &buflen);      if (err == EOPNOTSUPP)	/* If the protocol server can't tell us the address, just return a	   zero-length one.  */	{	  buf = (char *)addr;	  buflen = 0;	  err = 0;	}      if (err)	{	  __mach_port_deallocate (__mach_task_self (), addrport);	  return __hurd_dfail (fd, err);	}            if (*addr_len > buflen)	*addr_len = buflen;      if (buf != (char *) addr)	{	  memcpy (addr, buf, *addr_len);	  __vm_deallocate (__mach_task_self (), (vm_address_t) buf, buflen);	}      if (buflen > 0)	addr->sa_family = type;    }  __mach_port_deallocate (__mach_task_self (), addrport);  /* Toss control data; we don't care.  */  __vm_deallocate (__mach_task_self (), (vm_address_t) cdata, clen);  if (bufp != buf)    {      memcpy (buf, bufp, nread);      __vm_deallocate (__mach_task_self (), (vm_address_t) bufp, nread);    }  return nread;}weak_alias (__recvfrom, recvfrom)