sysdeps/mach/hurd/recvfrom.c

   1 /* Copyright (C) 1994, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <errno.h>
  20 #include <sys/socket.h>
  21 #include <hurd.h>
  22 #include <hurd/fd.h>
  23 #include <hurd/socket.h>
  24 #include <string.h>
  25
  26 /* Read N bytes into BUF through socket FD from peer
  27    at address ADDR (which is ADDR_LEN bytes long).
  28    Returns the number read or -1 for errors.  */
  29
  30 /* XXX should be __recvfrom ? */
  31 int
  32 recvfrom (fd, buf, n, flags, addrarg, addr_len)
  33      int fd;
  34      void *buf;
  35      size_t n;
  36      int flags;
  37      __SOCKADDR_ARG addrarg;
  38      size_t *addr_len;
  39 {
  40   error_t err;
  41   mach_port_t addrport;
  42   char *bufp = buf;
  43   mach_msg_type_number_t nread = n;
  44   mach_port_t *ports;
  45   mach_msg_type_number_t nports;
  46   char *cdata = NULL;
  47   mach_msg_type_number_t clen = 0;
  48   struct sockaddr *addr = addrarg.__sockaddr__;
  49
  50   if (err = HURD_DPORT_USE (fd, __socket_recv (port, &addrport,
  51                                                flags, &bufp, &nread,
  52                                                &ports, &nports,
  53                                                &cdata, &clen,
  54                                                &flags,
  55                                                n)))
  56     return __hurd_dfail (fd, err);
  57
  58   /* Get address data for the returned address port.  */
  59   {
  60     char *buf = (char *) addr;
  61     mach_msg_type_number_t buflen = *addr_len;
  62     int type;
  63
  64     err = __socket_whatis_address (addrport, &type, &buf, &buflen);
  65     if (err == EOPNOTSUPP)
  66       /* If the protocol server can't tell us the address, just return a
  67          zero-length one.  */
  68       {
  69         buf = (char *)addr;
  70         buflen = 0;
  71         err = 0;
  72       }
  73     __mach_port_deallocate (__mach_task_self (), addrport);
  74     if (err)
  75       return __hurd_dfail (fd, err);
  76
  77     if (buf != (char *) addr)
  78       {
  79         if (*addr_len < buflen)
  80           *addr_len = buflen;
  81         memcpy (addr, buf, *addr_len);
  82         __vm_deallocate (__mach_task_self (), (vm_address_t) buf, buflen);
  83       }
  84
  85     if (buflen > 0)
  86       addr->sa_family = type;
  87   }
  88
  89   /* Toss control data; we don't care.  */
  90   __vm_deallocate (__mach_task_self (), (vm_address_t) cdata, clen);
  91
  92   if (bufp != buf)
  93     {
  94       memcpy (buf, bufp, nread);
  95       __vm_deallocate (__mach_task_self (), (vm_address_t) bufp, nread);
  96     }
  97
  98   return nread;
  99 }