elf/dl-error.c

   1 /* Error handling for runtime dynamic linker.
   2 Copyright (C) 1995 Free Software Foundation, Inc.
   3 This file is part of the GNU C Library.
   4
   5 The GNU C Library is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU Library General Public License as
   7 published by the Free Software Foundation; either version 2 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 Library General Public License for more details.
  14
  15 You should have received a copy of the GNU Library General Public
  16 License along with the GNU C Library; see the file COPYING.LIB.  If
  17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  18 Cambridge, MA 02139, USA.  */
  19
  20 #include <stddef.h>
  21 #include <link.h>
  22 #include <setjmp.h>
  23
  24 static jmp_buf catch_env;
  25 static const char *signalled_errstring, *signalled_objname;
  26
  27 void
  28 _dl_signal_error (int errcode,
  29                   const char *objname,
  30                   const char *errstring)
  31 {
  32   signalled_errstring = errstring ?: "DYNAMIC LINKER BUG!!!";
  33   signalled_objname = objname;
  34   longjmp (catch_env, errcode ?: -1);
  35 }
  36
  37 int
  38 _dl_catch_error (const char **errstring,
  39                  const char **objname,
  40                  void (*operate) (void))
  41 {
  42   int errcode;
  43
  44   signalled_errstring = signalled_objname = NULL;
  45   errcode = setjmp (catch_env);
  46   if (errcode == 0)
  47     {
  48       (*operate) ();
  49       *errstring = *objname = NULL;
  50       return 0;
  51     }
  52
  53   /* We get here only if we longjmp'd out of OPERATE.  */
  54   *errstring = signalled_errstring;
  55   *objname = signalled_objname;
  56   return errcode == -1 ? 0 : errcode;
  57 }