sysdeps/mach/hurd/recvfrom.c

   1 /* Copyright (C) 1994 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
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  20 #include <errno.h>
  21 #include <sys/socket.h>
  22 #include <hurd.h>
  23 #include <hurd/fd.h>
  24 #include <hurd/socket.h>
  25 #include <string.h>
  26
  27 /* Read N bytes into BUF through socket FD from peer
  28    at address ADDR (which is ADDR_LEN bytes long).
  29    Returns the number read or -1 for errors.  */
  30 int
  31 DEFUN(recvfrom, (fd, buf, n, flags, addr, addr_len),
  32       int fd AND PTR buf AND size_t n AND int flags AND
  33       struct sockaddr *addr AND size_t *addr_len)
  34 {
  35   error_t err;
  36   mach_port_t addrport;
  37   char *bufp = buf;
  38   mach_msg_type_number_t nread = n;
  39   mach_port_t *ports;
  40   mach_msg_type_number_t nports;
  41   char *cdata = NULL;
  42   mach_msg_type_number_t clen = 0;
  43
  44   if (err = HURD_DPORT_USE (fd, __socket_recv (port, &addrport,
  45                                                flags, &bufp, &nread,
  46                                                &ports, &nports,
  47                                                &cdata, &clen,
  48                                                &flags,
  49                                                n)))
  50     return __hurd_dfail (fd, err);
  51
  52   /* Get address data for the returned address port.  */
  53   {
  54     char *buf = (char *) addr;
  55     mach_msg_type_number_t buflen = *addr_len;
  56     int type;
  57
  58     err = __socket_whatis_address (addrport, &type, &buf, &buflen);
  59     if (err == EOPNOTSUPP)
  60       /* If the protocol server can't tell us the address, just return a
  61          zero-length one.  */
  62       {
  63         buf = (char *)addr;
  64         buflen = 0;
  65         err = 0;
  66       }
  67     __mach_port_deallocate (__mach_task_self (), addrport);
  68     if (err)
  69       return __hurd_dfail (fd, err);
  70
  71     if (buf != (char *) addr)
  72       {
  73         if (*addr_len < buflen)
  74           *addr_len = buflen;
  75         memcpy (addr, buf, *addr_len);
  76         __vm_deallocate (__mach_task_self (), (vm_address_t) buf, buflen);
  77       }
  78
  79     if (buflen > 0)
  80       addr->sa_family = type;
  81   }
  82
  83   /* Toss control data; we don't care.  */
  84   __vm_deallocate (__mach_task_self (), (vm_address_t) cdata, clen);
  85
  86   if (bufp != buf)
  87     {
  88       memcpy (buf, bufp, nread);
  89       __vm_deallocate (__mach_task_self (), (vm_address_t) bufp, nread);
  90     }
  91
  92   return nread;
  93 }
  94