sysdeps/mach/hurd/recv.c

   1 /* Copyright (C) 1994-2018 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <sys/socket.h>
  20 #include <hurd.h>
  21 #include <hurd/fd.h>
  22 #include <hurd/socket.h>
  23 #include <string.h>
  24
  25 /* Read N bytes into BUF from socket FD.
  26    Returns the number read or -1 for errors.  */
  27
  28 ssize_t
  29 __recv (int fd, void *buf, size_t n, int flags)
  30 {
  31   error_t err;
  32   mach_port_t addrport;
  33   char *bufp = buf;
  34   mach_msg_type_number_t nread = n;
  35   mach_port_t *ports;
  36   mach_msg_type_number_t nports = 0;
  37   char *cdata = NULL;
  38   mach_msg_type_number_t clen = 0;
  39
  40   err = HURD_DPORT_USE (fd, __socket_recv (port, &addrport,
  41                                                flags, &bufp, &nread,
  42                                                &ports, &nports,
  43                                                &cdata, &clen,
  44                                                &flags,
  45                                                n));
  46   if (err == MIG_BAD_ID || err == EOPNOTSUPP)
  47     /* The file did not grok the socket protocol.  */
  48     err = ENOTSOCK;
  49   if (err)
  50     return __hurd_sockfail (fd, flags, err);
  51
  52   __mach_port_deallocate (__mach_task_self (), addrport);
  53   __vm_deallocate (__mach_task_self (), (vm_address_t) cdata, clen);
  54
  55   if (bufp != buf)
  56     {
  57       memcpy (buf, bufp, nread);
  58       __vm_deallocate (__mach_task_self (), (vm_address_t) bufp, nread);
  59     }
  60
  61   return nread;
  62 }
  63 libc_hidden_def (__recv)
  64 weak_alias (__recv, recv)