1  /* Copyright (C) 1992-2023 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     <https://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    stack_t 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  }