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- /* Support for signoring SIGTTOU.
- Copyright (C) 2003-2022 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 SCOPED_IGNORE_SIGTTOU_H
- #define SCOPED_IGNORE_SIGTTOU_H
- #include "gdbsupport/scoped_ignore_signal.h"
- #include "gdbsupport/job-control.h"
- #ifdef SIGTTOU
- /* Simple wrapper that allows lazy initialization / destruction of T.
- Slightly more efficient than gdb::optional, because it doesn't
- carry storage to track whether the object has been initialized. */
- template<typename T>
- class lazy_init
- {
- public:
- void emplace ()
- {
- new (&m_u.obj) T ();
- }
- void reset ()
- {
- m_u.obj.~T ();
- }
- private:
- union u
- {
- /* Must define ctor/dtor if T has non-trivial ctor/dtor. */
- u () {}
- ~u () {}
- T obj;
- } m_u;
- };
- /* RAII class used to ignore SIGTTOU in a scope. This isn't simply
- scoped_ignore_signal<SIGTTOU> because we want to check the
- `job_control' global. */
- class scoped_ignore_sigttou
- {
- public:
- scoped_ignore_sigttou ()
- {
- if (job_control)
- m_ignore_signal.emplace ();
- }
- ~scoped_ignore_sigttou ()
- {
- if (job_control)
- m_ignore_signal.reset ();
- }
- DISABLE_COPY_AND_ASSIGN (scoped_ignore_sigttou);
- private:
- lazy_init<scoped_ignore_signal<SIGTTOU, false>> m_ignore_signal;
- };
- #else
- using scoped_ignore_sigttou = scoped_ignore_signal_nop;
- #endif
- #endif /* SCOPED_IGNORE_SIGTTOU_H */
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