1  /* Declarations for handling faults in the signal thread.
       2     Copyright (C) 1994-2023 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 */