sysdeps/mach/hurd/sigstack.c

   1 /* Copyright (C) 1992 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  20 #include <errno.h>
  21 #include <signal.h>
  22 #include <hurd.h>
  23
  24 /* Run signals handlers on the stack specified by SS (if not NULL).
  25    If OSS is not NULL, it is filled in with the old signal stack status.  */
  26 int
  27 DEFUN(sigstack, (ss, oss),
  28       CONST struct sigstack *ss AND struct sigstack *oss)
  29 {
  30   struct sigaltstack as, oas;
  31
  32   as.ss_sp = ss->ss_sp;
  33   as.ss_size = 0;
  34   as.ss_flags = 0;
  35
  36   if (sigaltstack (&as, &oas) < 0)
  37     return -1;
  38
  39   if (oss != NULL)
  40     {
  41       oss->ss_sp = oas.ss_sp;
  42       oss->ss_onstack = oas.ss_flags & SA_ONSTACK;
  43     }
  44
  45   return 0;
  46 }