/* scoped_fd, automatically close a file descriptor Copyright (C) 2018-2020 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 "filestuff.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 */ |