gdbsupport/block-signals.h

   1 /* Block signals used by gdb
   2
   3    Copyright (C) 2019-2020 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
  27 namespace 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.  */
  33 class block_signals
  34 {
  35 public:
  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     gdb_sigmask (SIG_BLOCK, &mask, &m_old_mask);
  46 #endif
  47   }
  48
  49   ~block_signals ()
  50   {
  51 #ifdef HAVE_SIGPROCMASK
  52     gdb_sigmask (SIG_SETMASK, &m_old_mask, nullptr);
  53 #endif
  54   }
  55
  56   DISABLE_COPY_AND_ASSIGN (block_signals);
  57
  58 private:
  59
  60 #ifdef HAVE_SIGPROCMASK
  61   sigset_t m_old_mask;
  62 #endif
  63 };
  64
  65 }
  66
  67 #endif /* GDBSUPPORT_BLOCK_SIGNALS_H */