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- /* scoped_fd, automatically close a file descriptor
- Copyright (C) 2018-2022 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 COMMON_SCOPED_FD_H
- #define COMMON_SCOPED_FD_H
- #include <unistd.h>
- #include "gdb_file.h"
- /* A smart-pointer-like class to automatically close a file descriptor. */
- class scoped_fd
- {
- public:
- explicit scoped_fd (int fd = -1) noexcept : m_fd (fd) {}
- scoped_fd (scoped_fd &&other) noexcept
- : m_fd (other.m_fd)
- {
- other.m_fd = -1;
- }
- ~scoped_fd ()
- {
- if (m_fd >= 0)
- close (m_fd);
- }
- scoped_fd &operator= (scoped_fd &&other)
- {
- if (m_fd != other.m_fd)
- {
- if (m_fd >= 0)
- close (m_fd);
- m_fd = other.m_fd;
- other.m_fd = -1;
- }
- return *this;
- }
- DISABLE_COPY_AND_ASSIGN (scoped_fd);
- ATTRIBUTE_UNUSED_RESULT int release () noexcept
- {
- int fd = m_fd;
- m_fd = -1;
- return fd;
- }
- /* Like release, but return a gdb_file_up that owns the file
- descriptor. On success, this scoped_fd will be released. On
- failure, return NULL and leave this scoped_fd in possession of
- the fd. */
- gdb_file_up to_file (const char *mode) noexcept
- {
- gdb_file_up result (fdopen (m_fd, mode));
- if (result != nullptr)
- m_fd = -1;
- return result;
- }
- int get () const noexcept
- {
- return m_fd;
- }
- private:
- int m_fd;
- };
- #endif /* COMMON_SCOPED_FD_H */
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