sysdeps/mach/hurd/mig-reply.c

   1 /* Copyright (C) 1994-2021 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    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <mach.h>
  19 #include <mach/mig_support.h>
  20 #include <hurd/threadvar.h>
  21
  22 /* These functions are called by MiG-generated code.  */
  23
  24 mach_port_t __hurd_reply_port0;
  25
  26 /* Called by MiG to get a reply port.  */
  27 mach_port_t
  28 __mig_get_reply_port (void)
  29 {
  30   if (__hurd_local_reply_port == MACH_PORT_NULL
  31       || (&__hurd_local_reply_port != &__hurd_reply_port0
  32           && __hurd_local_reply_port == __hurd_reply_port0))
  33     __hurd_local_reply_port = __mach_reply_port ();
  34
  35   return __hurd_local_reply_port;
  36 }
  37 weak_alias (__mig_get_reply_port, mig_get_reply_port)
  38 libc_hidden_def (__mig_get_reply_port)
  39
  40 /* Called by MiG to deallocate the reply port.  */
  41 void
  42 __mig_dealloc_reply_port (mach_port_t arg)
  43 {
  44   mach_port_t port = __hurd_local_reply_port;
  45   __hurd_local_reply_port = MACH_PORT_NULL;     /* So the mod_refs RPC won't use it.  */
  46
  47   if (MACH_PORT_VALID (port))
  48     __mach_port_mod_refs (__mach_task_self (), port,
  49                           MACH_PORT_RIGHT_RECEIVE, -1);
  50 }
  51 weak_alias (__mig_dealloc_reply_port, mig_dealloc_reply_port)
  52 libc_hidden_def (__mig_dealloc_reply_port)
  53
  54 /* Called by mig interfaces when done with a port.  Used to provide the
  55    same interface as needed when a custom allocator is used.  */
  56 void
  57 __mig_put_reply_port(mach_port_t port)
  58 {
  59   /* Do nothing.  */
  60 }
  61 weak_alias (__mig_put_reply_port, mig_put_reply_port)
  62
  63 /* Called at startup with STACK == NULL.  When per-thread variables are set
  64    up, this is called again with STACK set to the new stack being switched
  65    to, where per-thread variables should be set up.  */
  66 void
  67 __mig_init (void *stack)
  68 {
  69   /* Do nothing.  */
  70 }
  71 weak_alias (__mig_init, mig_init)
  72 libc_hidden_def (__mig_init)