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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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