sysdeps/gnu/unwind-resume.c

   1 /* Copyright (C) 2003-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Jakub Jelinek <jakub@redhat.com>.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If
  17    not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #include <dlfcn.h>
  20 #include <stdio.h>
  21 #include <unwind.h>
  22 #include <gnu/lib-names.h>
  23
  24 static void (*libgcc_s_resume) (struct _Unwind_Exception *exc);
  25 static _Unwind_Reason_Code (*libgcc_s_personality)
  26   (int, _Unwind_Action, _Unwind_Exception_Class, struct _Unwind_Exception *,
  27    struct _Unwind_Context *);
  28
  29 static void
  30 init (void)
  31 {
  32   void *resume, *personality;
  33   void *handle;
  34
  35   handle = __libc_dlopen (LIBGCC_S_SO);
  36
  37   if (handle == NULL
  38       || (resume = __libc_dlsym (handle, "_Unwind_Resume")) == NULL
  39       || (personality = __libc_dlsym (handle, "__gcc_personality_v0")) == NULL)
  40     __libc_fatal (LIBGCC_S_SO " must be installed for pthread_cancel to work\n");
  41
  42   libgcc_s_resume = resume;
  43   libgcc_s_personality = personality;
  44 }
  45
  46 void
  47 _Unwind_Resume (struct _Unwind_Exception *exc)
  48 {
  49   if (__builtin_expect (libgcc_s_resume == NULL, 0))
  50     init ();
  51   libgcc_s_resume (exc);
  52 }
  53
  54 _Unwind_Reason_Code
  55 __gcc_personality_v0 (int version, _Unwind_Action actions,
  56                       _Unwind_Exception_Class exception_class,
  57                       struct _Unwind_Exception *ue_header,
  58                       struct _Unwind_Context *context)
  59 {
  60   if (__builtin_expect (libgcc_s_personality == NULL, 0))
  61     init ();
  62   return libgcc_s_personality (version, actions, exception_class,
  63                                ue_header, context);
  64 }