1/* Block signals used by gdb
2
3   Copyright (C) 2019-2023 Free Software Foundation, Inc.
4
5   This file is part of GDB.
6
7   This program is free software; you can redistribute it and/or modify
8   it under the terms of the GNU General Public License as published by
9   the Free Software Foundation; either version 3 of the License, or
10   (at your option) any later version.
11
12   This program is distributed in the hope that it will be useful,
13   but WITHOUT ANY WARRANTY; without even the implied warranty of
14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15   GNU General Public License for more details.
16
17   You should have received a copy of the GNU General Public License
18   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
19
20#ifndef GDBSUPPORT_BLOCK_SIGNALS_H
21#define GDBSUPPORT_BLOCK_SIGNALS_H
22
23#include <signal.h>
24
25#include "gdbsupport/gdb-sigmask.h"
26
27namespace gdb
28{
29
30/* This is an RAII class that temporarily blocks the signals needed by
31   gdb.  This can be used before starting a new thread to ensure that
32   this thread starts with the appropriate signals blocked.  */
33class block_signals
34{
35public:
36  block_signals ()
37  {
38#ifdef HAVE_SIGPROCMASK
39    sigset_t mask;
40    sigemptyset (&mask);
41    sigaddset (&mask, SIGINT);
42    sigaddset (&mask, SIGCHLD);
43    sigaddset (&mask, SIGALRM);
44    sigaddset (&mask, SIGWINCH);
45    sigaddset (&mask, SIGTERM);
46    gdb_sigmask (SIG_BLOCK, &mask, &m_old_mask);
47#endif
48  }
49
50  ~block_signals ()
51  {
52#ifdef HAVE_SIGPROCMASK
53    gdb_sigmask (SIG_SETMASK, &m_old_mask, nullptr);
54#endif
55  }
56
57  DISABLE_COPY_AND_ASSIGN (block_signals);
58
59private:
60
61#ifdef HAVE_SIGPROCMASK
62  sigset_t m_old_mask;
63#endif
64};
65
66}
67
68#endif /* GDBSUPPORT_BLOCK_SIGNALS_H */
69