129 lines
3.8 KiB
C++
129 lines
3.8 KiB
C++
/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* Copyright 2017-2018 Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef CRUFT_UTIL_POSIX_FD_HPP
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#define CRUFT_UTIL_POSIX_FD_HPP
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#include "../debug.hpp"
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#include "../view.hpp"
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#include <experimental/filesystem>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#if !defined(O_BINARY)
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#define O_BINARY 0
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#endif
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namespace cruft::posix {
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///------------------------------------------------------------------------
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/// A simple RAII wrapper for file descriptors
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class fd {
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public:
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///////////////////////////////////////////////////////////////////////
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// If you are using a system which delineates between binary/text mode
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// for descriptors the behaviour is undefined if you don't set the
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// necessary flags for binary mode.
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fd (const std::experimental::filesystem::path &path, int flags);
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fd (const std::experimental::filesystem::path &path, int flags, mode_t);
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fd (fd &&) noexcept;
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fd& operator= (fd &&) noexcept;
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fd& operator= (int);
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// The int constructor steals the fd. So don't pass in something that
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// you don't want closed at destruct time. This should really only be
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// used when interfacing with results of syscalls that we don't wrap.
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explicit fd (int);
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// copy constructors are removed in favour of explicit calls to dup.
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// This should reduce unexpected or expensive copies as much as
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// possible; one should not be doing this unless it is absolutely
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// required.
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fd (const fd&) = delete;
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fd dup (void) const;
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static fd dup (int);
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~fd ();
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///////////////////////////////////////////////////////////////////////
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struct ::stat stat (void) const;
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///////////////////////////////////////////////////////////////////////
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void close (void);
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void reset (int);
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void reset (void);
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int release (void);
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//---------------------------------------------------------------------
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[[nodiscard]] ssize_t read (void *buf, size_t count);
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[[nodiscard]] ssize_t write (const void *buf, size_t count);
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//---------------------------------------------------------------------
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template <typename ValueT>
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[[nodiscard]]
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ValueT*
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read (cruft::view<ValueT*> dst)
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{
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return dst.begin () + read (
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&*std::data (dst), std::size (dst) * sizeof (ValueT)
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);
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}
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//---------------------------------------------------------------------
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template <typename ValueT>
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[[nodiscard]]
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auto
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write (const cruft::view<ValueT*> &src)
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{
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return const_cast<ValueT*> (
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write (
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cruft::view<const ValueT*> (src)
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)
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);
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}
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//---------------------------------------------------------------------
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template <typename ValueT>
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[[nodiscard]]
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const ValueT*
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write (const cruft::view<const ValueT*> &src)
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{
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const auto written = write (
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&*std::data (src), std::size (src) * sizeof (ValueT)
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);
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CHECK_MOD (written, sizeof (ValueT));
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return src.begin () + written / sizeof (ValueT);
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}
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//---------------------------------------------------------------------
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[[nodiscard]] off_t lseek (off_t offset, int whence);
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///////////////////////////////////////////////////////////////////////
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operator int (void) const;
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int native (void) const { return m_fd; }
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private:
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int m_fd;
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};
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}
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#endif
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