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 _SIGNAL_H
  20 # error "Never include this file directly.  Use <signal.h> instead"
  21 #endif
  22
  23
  24 /* Structure describing a signal stack (obsolete).  */
  25 struct sigstack
  26   {
  27     __ptr_t ss_sp;              /* Signal stack pointer.  */
  28     int ss_onstack;             /* Nonzero if executing on this stack.  */
  29   };
  30
  31
  32 /* Alternate, preferred interface.  */
  33 typedef struct sigaltstack
  34   {
  35     __ptr_t ss_sp;
  36     size_t ss_size;
  37     int ss_flags;
  38   } stack_t;
  39
  40
  41 /* Possible values for `ss_flags.'.  */
  42 enum
  43 {
  44   SS_ONSTACK = 0x0001,
  45 #define SS_ONSTACK      SS_ONSTACK
  46   SS_DISABLE = 0x0004
  47 #define SS_DISABLE      SS_DISABLE
  48 };
  49
  50 /* Minumum stack size for a signal handler.  */
  51 #define MINSIGSTKSZ     8192
  52
  53 /* System default stack size.  */
  54 #define SIGSTKSZ        (MINSIGSTKSZ + 32768)