1 /* Copyright (C) 1992-2021 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
sigstack(struct sigstack * ss,struct sigstack * oss)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 }
44