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