sysdeps/generic/bits/sigstack.h

   1 /* sigstack, sigaltstack definitions.
   2    Copyright (C) 1998, 1999 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef _SIGNAL_H
  21 # error "Never include this file directly.  Use <signal.h> instead"
  22 #endif
  23
  24
  25 /* Structure describing a signal stack (obsolete).  */
  26 struct sigstack
  27   {
  28     __ptr_t ss_sp;              /* Signal stack pointer.  */
  29     int ss_onstack;             /* Nonzero if executing on this stack.  */
  30   };
  31
  32
  33 /* Alternate, preferred interface.  */
  34 typedef struct sigaltstack
  35   {
  36     __ptr_t ss_sp;
  37     size_t ss_size;
  38     int ss_flags;
  39   } stack_t;
  40
  41
  42 /* Possible values for `ss_flags.'.  */
  43 enum
  44 {
  45   SS_ONSTACK = 0x0001,
  46 #define SS_ONSTACK      SS_ONSTACK
  47   SS_DISABLE = 0x0004
  48 #define SS_DISABLE      SS_DISABLE
  49 };
  50
  51 /* Minumum stack size for a signal handler.  */
  52 #define MINSIGSTKSZ     8192
  53
  54 /* System default stack size.  */
  55 #define SIGSTKSZ        (MINSIGSTKSZ + 32768)