bits/sigstack.h

   1 /* sigstack, sigaltstack definitions.
   2    Copyright (C) 1998-2017 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    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _BITS_SIGSTACK_H
  20 #define _BITS_SIGSTACK_H 1
  21
  22 #if !defined _SIGNAL_H && !defined _SYS_UCONTEXT_H
  23 # error "Never include this file directly.  Use <signal.h> instead"
  24 #endif
  25
  26
  27 /* Structure describing a signal stack (obsolete).  */
  28 struct sigstack
  29   {
  30     __ptr_t ss_sp;              /* Signal stack pointer.  */
  31     int ss_onstack;             /* Nonzero if executing on this stack.  */
  32   };
  33
  34
  35 /* Alternate, preferred interface.  */
  36 typedef struct sigaltstack
  37   {
  38     __ptr_t ss_sp;
  39     size_t ss_size;
  40     int ss_flags;
  41   } stack_t;
  42
  43
  44 /* Possible values for `ss_flags.'.  */
  45 enum
  46 {
  47   SS_ONSTACK = 0x0001,
  48 #define SS_ONSTACK      SS_ONSTACK
  49   SS_DISABLE = 0x0004
  50 #define SS_DISABLE      SS_DISABLE
  51 };
  52
  53 /* Minumum stack size for a signal handler.  */
  54 #define MINSIGSTKSZ     8192
  55
  56 /* System default stack size.  */
  57 #define SIGSTKSZ        (MINSIGSTKSZ + 32768)
  58
  59 #endif /* bits/sigstack.h */