blob: 8334811a7e8a3228211b718aaf73ee57c9074b89 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
/* sigaltstack.c - Generic sigaltstack implementation.
Copyright (C) 2008 Free Software Foundation, Inc.
Written by Neal H. Walfield <neal@gnu.org>.
This file is part of the GNU Hurd.
The GNU Hurd 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 3 of
the License, or (at your option) any later version.
The GNU Hurd 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 this program. If not, see
<http://www.gnu.org/licenses/>. */
#include "sig-internal.h"
#include "pt-internal.h"
int
sigaltstack (const stack_t *restrict stack, stack_t *restrict old)
{
int err = 0;
struct signal_state *ss = &_pthread_self ()->ss;
pthread_mutex_lock (&ss->lock);
if (old)
*old = ss->stack;
if (stack)
{
if (stack->ss_size < MINSIGSTKSZ)
{
err = ENOMEM;
goto out;
}
if ((stack->ss_flags & ~(SS_DISABLE)))
/* Flags contains a value other than SS_DISABLE. */
{
err = EINVAL;
goto out;
}
if ((ss->stack.ss_flags & SS_ONSTACK))
/* Stack in use. */
{
err = EPERM;
goto out;
}
ss->stack = *stack;
}
out:
pthread_mutex_unlock (&ss->lock);
if (err)
{
errno = err;
return -1;
}
return 0;
}
|
