sysdeps/mach/hurd/mig-reply.c

   1 /* Copyright (C) 1994-2024 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 <assert.h>
  19 #include <mach.h>
  20 #include <mach/mig_support.h>
  21 #include <tls.h>
  22
  23 /* These functions are called by MiG-generated code.  */
  24
  25 #if !defined (SHARED) || IS_IN (rtld)
  26 mach_port_t __hurd_reply_port0;
  27 #endif
  28
  29 static mach_port_t
  30 get_reply_port (void)
  31 {
  32 #if !defined (SHARED) || IS_IN (rtld)
  33   if (__LIBC_NO_TLS ())
  34     return __hurd_reply_port0;
  35 #endif
  36   return THREAD_GETMEM (THREAD_SELF, reply_port);
  37 }
  38
  39 static void
  40 set_reply_port (mach_port_t port)
  41 {
  42 #if !defined (SHARED) || IS_IN (rtld)
  43   if (__LIBC_NO_TLS ())
  44     __hurd_reply_port0 = port;
  45   else
  46 #endif
  47     THREAD_SETMEM (THREAD_SELF, reply_port, port);
  48 }
  49
  50 /* Called by MiG to get a reply port.  */
  51 mach_port_t
  52 __mig_get_reply_port (void)
  53 {
  54   mach_port_t port = get_reply_port ();
  55   if (__glibc_unlikely (port == MACH_PORT_NULL))
  56     {
  57       port = __mach_reply_port ();
  58       set_reply_port (port);
  59     }
  60   return port;
  61 }
  62 weak_alias (__mig_get_reply_port, mig_get_reply_port)
  63 libc_hidden_def (__mig_get_reply_port)
  64
  65 /* Called by MiG to deallocate the reply port.  */
  66 void
  67 __mig_dealloc_reply_port (mach_port_t arg)
  68 {
  69   error_t err;
  70   mach_port_t port = get_reply_port ();
  71
  72   set_reply_port (MACH_PORT_NULL);      /* So the mod_refs RPC won't use it.  */
  73   assert (port == arg);
  74   if (!MACH_PORT_VALID (port))
  75     return;
  76
  77   err = __mach_port_mod_refs (__mach_task_self (), port,
  78                               MACH_PORT_RIGHT_RECEIVE, -1);
  79   if (err == KERN_INVALID_RIGHT)
  80     /* It could be that during signal handling, the receive right had been
  81        replaced with a dead name.  */
  82     err = __mach_port_mod_refs (__mach_task_self (), port,
  83                                 MACH_PORT_RIGHT_DEAD_NAME, -1);
  84
  85   assert_perror (err);
  86 }
  87 weak_alias (__mig_dealloc_reply_port, mig_dealloc_reply_port)
  88 libc_hidden_def (__mig_dealloc_reply_port)
  89
  90 /* Called by mig interfaces when done with a port.  Used to provide the
  91    same interface as needed when a custom allocator is used.  */
  92 void
  93 __mig_put_reply_port(mach_port_t port)
  94 {
  95   /* Do nothing.  */
  96 }
  97 weak_alias (__mig_put_reply_port, mig_put_reply_port)
  98
  99 /* Called at startup with STACK == NULL.  When per-thread variables are set
 100    up, this is called again with STACK set to the new stack being switched
 101    to, where per-thread variables should be set up.  */
 102 void
 103 __mig_init (void *stack)
 104 {
 105   /* Do nothing.  */
 106 }
 107 weak_alias (__mig_init, mig_init)
 108 libc_hidden_def (__mig_init)