sysdeps/unix/sysv/linux/ia64/bits/sigstack.h

   1 /* sigstack, sigaltstack definitions.
   2    Copyright (C) 1998-2016 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 #define __need_size_t
  27 #include <stddef.h>
  28
  29 /* Structure describing a signal stack (obsolete).  */
  30 struct sigstack
  31   {
  32     __ptr_t ss_sp;              /* Signal stack pointer.  */
  33     int ss_onstack;             /* Nonzero if executing on this stack.  */
  34   };
  35
  36 /* Alternate, preferred interface.  */
  37 typedef struct sigaltstack
  38   {
  39     __ptr_t ss_sp;
  40     int ss_flags;
  41     size_t ss_size;
  42   } stack_t;
  43
  44 /* Possible values for `ss_flags'.  */
  45 enum
  46 {
  47   SS_ONSTACK = 1,
  48 #define SS_ONSTACK      SS_ONSTACK
  49   SS_DISABLE
  50 #define SS_DISABLE      SS_DISABLE
  51 };
  52
  53 /* Minimum stack size for a signal handler.
  54
  55    Yes, this should be 131072 but the constant got defined incorrectly
  56    in the kernel and we have to live with it.  Users should in any case
  57    use SIGSTKSZ as the size user-supplied buffers should have.  */
  58 #define MINSIGSTKSZ     131027
  59
  60 /* System default stack size.  */
  61 #define SIGSTKSZ        262144
  62
  63 #endif /* bits/sigstack.h */