sysdeps/mach/hurd/recv.c

   1 /* Copyright (C) 1994 Fremach_msg_type_number_t 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 from socket FD.
  28    Returns the number read or -1 for errors.  */
  29 int
  30 DEFUN(recv, (fd, buf, n, flags),
  31       int fd AND PTR buf AND size_t n AND int flags)
  32 {
  33   error_t err;
  34   mach_port_t addrport;
  35   char *bufp = buf;
  36   mach_msg_type_number_t nread = n;
  37   mach_port_t *ports;
  38   mach_msg_type_number_t nports;
  39   char *cdata = NULL;
  40   mach_msg_type_number_t clen = 0;
  41
  42   if (err = HURD_DPORT_USE (fd, __socket_recv (port, &addrport,
  43                                                flags, &bufp, &nread,
  44                                                &ports, &nports,
  45                                                &cdata, &clen,
  46                                                &flags,
  47                                                n)))
  48     return __hurd_dfail (fd, err);
  49
  50   __mach_port_deallocate (__mach_task_self (), addrport);
  51   __vm_deallocate (__mach_task_self (), (vm_address_t) cdata, clen);
  52
  53   if (bufp != buf)
  54     {
  55       memcpy (buf, bufp, nread);
  56       __vm_deallocate (__mach_task_self (), (vm_address_t) bufp, nread);
  57     }
  58
  59   return nread;
  60 }