derek.holloway
7502bf64a4
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71 lines
1.8 KiB
C++
71 lines
1.8 KiB
C++
/* Temporarily install an alternate signal stack
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Copyright (C) 2019-2024 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef GDBSUPPORT_ALT_STACK_H
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#define GDBSUPPORT_ALT_STACK_H
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#include <signal.h>
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namespace gdb
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{
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/* Try to set up an alternate signal stack for SIGSEGV handlers.
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This allows us to handle SIGSEGV signals generated when the
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normal process stack is exhausted. If this stack is not set
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up (sigaltstack is unavailable or fails) and a SIGSEGV is
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generated when the normal stack is exhausted then the program
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will behave as though no SIGSEGV handler was installed. */
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class alternate_signal_stack
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{
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public:
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alternate_signal_stack ()
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{
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#ifdef HAVE_SIGALTSTACK
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m_stack.reset ((char *) xmalloc (SIGSTKSZ));
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stack_t stack;
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stack.ss_sp = m_stack.get ();
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stack.ss_size = SIGSTKSZ;
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stack.ss_flags = 0;
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sigaltstack (&stack, &m_old_stack);
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#endif
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}
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~alternate_signal_stack ()
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{
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#ifdef HAVE_SIGALTSTACK
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sigaltstack (&m_old_stack, nullptr);
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#endif
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}
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DISABLE_COPY_AND_ASSIGN (alternate_signal_stack);
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private:
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#ifdef HAVE_SIGALTSTACK
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gdb::unique_xmalloc_ptr<char> m_stack;
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stack_t m_old_stack;
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#endif
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};
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}
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#endif /* GDBSUPPORT_ALT_STACK_H */
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