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/* Temporarily install an alternate signal stack
Copyright (C) 2019-2021 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef GDBSUPPORT_ALT_STACK_H
#define GDBSUPPORT_ALT_STACK_H
#include <signal.h>
namespace gdb
{
/* Try to set up an alternate signal stack for SIGSEGV handlers.
This allows us to handle SIGSEGV signals generated when the
normal process stack is exhausted. If this stack is not set
up (sigaltstack is unavailable or fails) and a SIGSEGV is
generated when the normal stack is exhausted then the program
will behave as though no SIGSEGV handler was installed. */
class alternate_signal_stack
{
public:
alternate_signal_stack ()
{
#ifdef HAVE_SIGALTSTACK
m_stack.reset ((char *) xmalloc (SIGSTKSZ));
stack_t stack;
stack.ss_sp = m_stack.get ();
stack.ss_size = SIGSTKSZ;
stack.ss_flags = 0;
sigaltstack (&stack, &m_old_stack);
#endif
}
~alternate_signal_stack ()
{
#ifdef HAVE_SIGALTSTACK
sigaltstack (&m_old_stack, nullptr);
#endif
}
DISABLE_COPY_AND_ASSIGN (alternate_signal_stack);
private:
#ifdef HAVE_SIGALTSTACK
gdb::unique_xmalloc_ptr<char> m_stack;
stack_t m_old_stack;
#endif
};
}
#endif /* GDBSUPPORT_ALT_STACK_H */
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