mirror of
https://sourceware.org/git/glibc.git
synced 2025-11-03 20:53:13 +03:00
63 lines
1.7 KiB
C
63 lines
1.7 KiB
C
/* Copyright (C) 1992-2020 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <errno.h>
|
|
#include <hurd.h>
|
|
#include <hurd/signal.h>
|
|
|
|
/* Run signals handlers on the stack specified by SS (if not NULL).
|
|
If OSS is not NULL, it is filled in with the old signal stack status. */
|
|
int
|
|
__sigaltstack (const stack_t *argss, stack_t *oss)
|
|
{
|
|
struct hurd_sigstate *s;
|
|
stack_t ss, old;
|
|
|
|
/* Fault before taking any locks. */
|
|
if (argss != NULL)
|
|
ss = *argss;
|
|
if (oss != NULL)
|
|
*(volatile stack_t *) oss = *oss;
|
|
|
|
s = _hurd_self_sigstate ();
|
|
__spin_lock (&s->lock);
|
|
|
|
if (argss != NULL
|
|
&& (ss.ss_flags & SS_DISABLE)
|
|
&& (s->sigaltstack.ss_flags & SS_ONSTACK))
|
|
{
|
|
/* Can't disable a stack that is in use. */
|
|
__spin_unlock (&s->lock);
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
old = s->sigaltstack;
|
|
|
|
if (argss != NULL)
|
|
s->sigaltstack = ss;
|
|
|
|
__spin_unlock (&s->lock);
|
|
|
|
if (oss != NULL)
|
|
*oss = old;
|
|
|
|
return 0;
|
|
}
|
|
libc_hidden_def (__sigaltstack)
|
|
weak_alias (__sigaltstack, sigaltstack)
|