sysdeps/mach/hurd/sigstack.c

   1 /* Copyright (C) 1992-2015 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <signal.h>
  20 #include <hurd.h>
  21
  22 /* Run signals handlers on the stack specified by SS (if not NULL).
  23    If OSS is not NULL, it is filled in with the old signal stack status.  */
  24 int
  25 sigstack (struct sigstack *ss, struct sigstack *oss)
  26 {
  27   struct sigaltstack as, oas;
  28
  29   as.ss_sp = ss->ss_sp;
  30   as.ss_size = 0;
  31   as.ss_flags = 0;
  32
  33   if (__sigaltstack (&as, &oas) < 0)
  34     return -1;
  35
  36   if (oss != NULL)
  37     {
  38       oss->ss_sp = oas.ss_sp;
  39       oss->ss_onstack = oas.ss_flags & SS_ONSTACK;
  40     }
  41
  42   return 0;
  43 }