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e6e51c9c4b
The following patches wants to change gdb_fopen_cloexec and gdb_mkostemp_cloexec to return a scoped_fd. Doing this causes a cyclic include between scoped_fd.h and filestuff.h, that both want to include each other. scoped_fd.h includes filestuff.h because of the scoped_fd::to_file method's return value. filestuff.h would then include scoped_fd.h for gdb_fopen_cloexec's and gdb_mkostemp_cloexec's return values. To fix that, move gdb_file_up to its own file, gdb_file.h. Change-Id: Ic82a48914b2aacee8f14af535b7469245f88b93d
88 lines
2.0 KiB
C++
88 lines
2.0 KiB
C++
/* scoped_fd, automatically close a file descriptor
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Copyright (C) 2018-2021 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 COMMON_SCOPED_FD_H
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#define COMMON_SCOPED_FD_H
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#include <unistd.h>
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#include "gdb_file.h"
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/* A smart-pointer-like class to automatically close a file descriptor. */
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class scoped_fd
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{
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public:
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explicit scoped_fd (int fd = -1) noexcept : m_fd (fd) {}
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scoped_fd (scoped_fd &&other) noexcept
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: m_fd (other.m_fd)
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{
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other.m_fd = -1;
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}
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~scoped_fd ()
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{
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if (m_fd >= 0)
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close (m_fd);
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}
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scoped_fd &operator= (scoped_fd &&other)
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{
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if (m_fd != other.m_fd)
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{
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if (m_fd >= 0)
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close (m_fd);
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m_fd = other.m_fd;
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other.m_fd = -1;
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}
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return *this;
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}
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DISABLE_COPY_AND_ASSIGN (scoped_fd);
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ATTRIBUTE_UNUSED_RESULT int release () noexcept
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{
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int fd = m_fd;
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m_fd = -1;
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return fd;
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}
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/* Like release, but return a gdb_file_up that owns the file
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descriptor. On success, this scoped_fd will be released. On
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failure, return NULL and leave this scoped_fd in possession of
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the fd. */
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gdb_file_up to_file (const char *mode) noexcept
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{
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gdb_file_up result (fdopen (m_fd, mode));
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if (result != nullptr)
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m_fd = -1;
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return result;
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}
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int get () const noexcept
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{
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return m_fd;
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}
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private:
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int m_fd;
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};
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#endif /* COMMON_SCOPED_FD_H */
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