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6b09f1342c
Since GDB now requires C++17, we don't need the internally maintained gdb::optional implementation. This patch does the following replacing: - gdb::optional -> std::optional - gdb::in_place -> std::in_place - #include "gdbsupport/gdb_optional.h" -> #include <optional> This change has mostly been done automatically. One exception is gdbsupport/thread-pool.* which did not use the gdb:: prefix as it already lives in the gdb namespace. Change-Id: I19a92fa03e89637bab136c72e34fd351524f65e9 Approved-By: Tom Tromey <tom@tromey.com> Approved-By: Pedro Alves <pedro@palves.net>
88 lines
2.0 KiB
C++
88 lines
2.0 KiB
C++
/* Support for ignoring SIGTTOU.
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Copyright (C) 2003-2023 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 SCOPED_IGNORE_SIGTTOU_H
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#define SCOPED_IGNORE_SIGTTOU_H
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#include "gdbsupport/scoped_ignore_signal.h"
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#include "gdbsupport/job-control.h"
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#ifdef SIGTTOU
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/* Simple wrapper that allows lazy initialization / destruction of T.
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Slightly more efficient than std::optional, because it doesn't
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carry storage to track whether the object has been initialized. */
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template<typename T>
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class lazy_init
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{
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public:
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void emplace ()
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{
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new (&m_u.obj) T ();
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}
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void reset ()
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{
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m_u.obj.~T ();
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}
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private:
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union u
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{
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/* Must define ctor/dtor if T has non-trivial ctor/dtor. */
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u () {}
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~u () {}
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T obj;
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} m_u;
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};
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/* RAII class used to ignore SIGTTOU in a scope. This isn't simply
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scoped_ignore_signal<SIGTTOU> because we want to check the
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`job_control' global. */
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class scoped_ignore_sigttou
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{
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public:
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scoped_ignore_sigttou ()
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{
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if (job_control)
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m_ignore_signal.emplace ();
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}
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~scoped_ignore_sigttou ()
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{
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if (job_control)
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m_ignore_signal.reset ();
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}
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DISABLE_COPY_AND_ASSIGN (scoped_ignore_sigttou);
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private:
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lazy_init<scoped_ignore_signal<SIGTTOU, false>> m_ignore_signal;
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};
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#else
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using scoped_ignore_sigttou = scoped_ignore_signal_nop;
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#endif
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#endif /* SCOPED_IGNORE_SIGTTOU_H */
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