hurd/hurdfault.h

   1 /* Declarations for handling faults in the signal thread.
   2 Copyright (C) 1994, 1996 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 #ifndef _HURD_FAULT_H
  21 #define _HURD_FAULT_H
  22
  23 #include <hurd/sigpreempt.h>
  24 #include <setjmp.h>
  25
  26 /* Call this before code that might fault in the signal thread; SIGNO is
  27    the signal expected to possibly arrive.  This behaves like setjmp: it
  28    returns zero the first time, and returns again nonzero if the signal
  29    does arrive.  */
  30
  31 #define _hurdsig_catch_fault(sigset, firstcode, lastcode)       \
  32   (_hurdsig_fault_preempter.signals = (sigset),                 \
  33    _hurdsig_fault_preempter.first = (long int) (firstcode),     \
  34    _hurdsig_fault_preempter.last = (long int) (lastcode),       \
  35    setjmp (_hurdsig_fault_env))
  36
  37 /* Call this at the end of a section protected by _hurdsig_catch_fault.  */
  38
  39 #define _hurdsig_end_catch_fault() \
  40   (_hurdsig_fault_preempter.signals = 0)
  41
  42 extern jmp_buf _hurdsig_fault_env;
  43 extern struct hurd_signal_preempter _hurdsig_fault_preempter;
  44
  45
  46 #define _hurdsig_catch_memory_fault(object) \
  47   _hurdsig_catch_fault (sigmask (SIGSEGV) | sigmask (SIGBUS), \
  48                         (object), (object) + 1)
  49
  50
  51 #endif  /* hurdfault.h */