hurd/hurdfault.h

   1 /* Declarations for handling faults in the signal thread.
   2    Copyright (C) 1994-2022 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 Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the 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; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _HURD_FAULT_H
  20 #define _HURD_FAULT_H
  21
  22 #include <hurd/sigpreempt.h>
  23 #include <setjmp.h>
  24
  25 /* Call this before code that might fault in the signal thread; SIGNO is
  26    the signal expected to possibly arrive.  This behaves like setjmp: it
  27    returns zero the first time, and returns again nonzero if the signal
  28    does arrive.  */
  29
  30 #define _hurdsig_catch_fault(sigset, firstcode, lastcode)       \
  31   (_hurdsig_fault_preemptor.signals = (sigset),                 \
  32    _hurdsig_fault_preemptor.first = (long int) (firstcode),     \
  33    _hurdsig_fault_preemptor.last = (long int) (lastcode),       \
  34    setjmp (_hurdsig_fault_env))
  35
  36 /* Call this at the end of a section protected by _hurdsig_catch_fault.  */
  37
  38 #define _hurdsig_end_catch_fault() \
  39   (_hurdsig_fault_preemptor.signals = 0)
  40
  41 extern jmp_buf _hurdsig_fault_env;
  42 extern struct hurd_signal_preemptor _hurdsig_fault_preemptor;
  43
  44
  45 #define _hurdsig_catch_memory_fault(object) \
  46   _hurdsig_catch_fault (__sigmask (SIGSEGV) | __sigmask (SIGBUS), \
  47                         (object), (object) + 1)
  48
  49
  50 #endif  /* hurdfault.h */