file.h

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/*
 * This file is part of the µOS++ distribution.
 *   (https://github.com/micro-os-plus)
 * Copyright (c) 2015 Liviu Ionescu.
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom
 * the Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */
 
#ifndef CMSIS_PLUS_POSIX_IO_FILE_H_
#define CMSIS_PLUS_POSIX_IO_FILE_H_
 
// ----------------------------------------------------------------------------
 
#if defined(__cplusplus)
 
// ----------------------------------------------------------------------------
 
#if defined(OS_USE_OS_APP_CONFIG_H)
#include <cmsis-plus/os-app-config.h>
#endif
 
#include <cmsis-plus/posix-io/io.h>
#include <cmsis-plus/utils/lists.h>
#include <cmsis-plus/posix/utime.h>
#include <cmsis-plus/posix/sys/statvfs.h>
 
#include <mutex>
 
// ----------------------------------------------------------------------------
 
#pragma GCC diagnostic push
 
#if defined(__clang__)
#pragma clang diagnostic ignored "-Wc++98-compat"
#endif
 
// ----------------------------------------------------------------------------
 
namespace os
{
  namespace posix
  {
    // ------------------------------------------------------------------------
 
    class file_system;
    class file_impl;
 
    // ========================================================================
 
    class file : public io
    {
      // ----------------------------------------------------------------------
 
      friend class file_system;
      friend class io;
 
      // ----------------------------------------------------------------------
    public:
 
      file (file_impl& impl);
 
      // The rule of five.
      file (const file&) = delete;
      file (file&&) = delete;
      file&
      operator= (const file&) = delete;
      file&
      operator= (file&&) = delete;
 
      virtual
      ~file () override;
 
      // ----------------------------------------------------------------------
    public:
 
      virtual int
      close (void) override;
 
      virtual int
      ftruncate (off_t length);
 
      virtual int
      fsync (void);
 
      virtual int
      fstatvfs (struct statvfs *buf);
 
      // ----------------------------------------------------------------------
      // Support functions.
 
      class file_system&
      file_system (void);
 
      file_impl&
      impl (void) const;
 
      // ----------------------------------------------------------------------
    public:
 
      // Intrusive node used to link this file to the deferred
      // deallocation list. Must be public.
      utils::double_list_links deferred_links_;
 
    };
 
    // ========================================================================
 
    class file_impl : public io_impl
    {
      // ----------------------------------------------------------------------
 
      friend class file;
 
      // ----------------------------------------------------------------------
    public:
 
      file_impl (class file_system& fs);
 
      // The rule of five.
      file_impl (const file_impl&) = delete;
      file_impl (file_impl&&) = delete;
      file_impl&
      operator= (const file_impl&) = delete;
      file_impl&
      operator= (file_impl&&) = delete;
 
      virtual
      ~file_impl () override;
 
      // ----------------------------------------------------------------------
    public:
 
      // Implementations
 
      virtual int
      do_ftruncate (off_t length) = 0;
 
      virtual int
      do_fsync (void) = 0;
 
      // ----------------------------------------------------------------------
      // Support functions.
 
      class file_system&
      file_system (void);
 
      // ----------------------------------------------------------------------
    protected:
 
      class file_system& file_system_;
 
    };
 
    // ========================================================================
 
    template<typename T>
      class file_implementable : public file
      {
        // --------------------------------------------------------------------
 
      public:
 
        using value_type = T;
 
        // --------------------------------------------------------------------
 
      public:
 
        file_implementable (class file_system& fs);
 
        // The rule of five.
        file_implementable (const file_implementable&) = delete;
        file_implementable (file_implementable&&) = delete;
        file_implementable&
        operator= (const file_implementable&) = delete;
        file_implementable&
        operator= (file_implementable&&) = delete;
 
        virtual
        ~file_implementable () override;
 
        // --------------------------------------------------------------------
      public:
 
        // Support functions.
 
        value_type&
        impl (void) const;
 
        // --------------------------------------------------------------------
      protected:
 
        value_type impl_instance_;
 
      };
 
    // ========================================================================
 
    template<typename T, typename L>
      class file_lockable : public file
      {
        // --------------------------------------------------------------------
 
      public:
 
        using value_type = T;
        using lockable_type = L;
 
        // --------------------------------------------------------------------
 
      public:
 
        file_lockable (class file_system& fs, lockable_type& locker);
 
        // The rule of five.
        file_lockable (const file_lockable&) = delete;
        file_lockable (file_lockable&&) = delete;
        file_lockable&
        operator= (const file_lockable&) = delete;
        file_lockable&
        operator= (file_lockable&&) = delete;
 
        virtual
        ~file_lockable () override;
 
        // --------------------------------------------------------------------
      public:
 
        virtual int
        close (void) override;
 
        virtual ssize_t
        read (void* buf, std::size_t nbyte) override;
 
        virtual ssize_t
        write (const void* buf, std::size_t nbyte) override;
 
        virtual ssize_t
        writev (const struct iovec* iov, int iovcnt) override;
 
        virtual int
        vfcntl (int cmd, std::va_list args) override;
 
        virtual int
        fstat (struct stat* buf) override;
 
        virtual off_t
        lseek (off_t offset, int whence) override;
 
        virtual int
        ftruncate (off_t length) override;
 
        virtual int
        fsync (void) override;
 
        // fstatvfs() - must not be locked, since will be locked by the
        // file system. (otherwise non-recursive mutexes will fail).
 
        // --------------------------------------------------------------------
        // Support functions.
 
        value_type&
        impl (void) const;
 
        // --------------------------------------------------------------------
      protected:
 
        value_type impl_instance_;
 
        lockable_type& locker_;
 
      };
 
  // ==========================================================================
  } /* namespace posix */
} /* namespace os */
 
// ===== Inline & template implementations ====================================
 
namespace os
{
  namespace posix
  {
    // ========================================================================
 
    inline file_system&
    file::file_system (void)
    {
      return impl ().file_system ();
    }
 
    inline file_impl&
    file::impl (void) const
    {
      return static_cast<file_impl&> (impl_);
    }
 
    // ========================================================================
 
    inline class file_system&
    file_impl::file_system (void)
    {
      return file_system_;
    }
 
    // ========================================================================
 
    template<typename T>
      file_implementable<T>::file_implementable (class file_system& fs) :
          file
            { impl_instance_ }, //
          impl_instance_
            { fs }
      {
#if defined(OS_TRACE_POSIX_IO_FILE)
        trace::printf ("file_implementable::%s()=@%p\n", __func__, this);
#endif
      }
 
    template<typename T>
      file_implementable<T>::~file_implementable ()
      {
#if defined(OS_TRACE_POSIX_IO_FILE)
        trace::printf ("file_implementable::%s() @%p\n", __func__, this);
#endif
      }
 
    template<typename T>
      typename file_implementable<T>::value_type&
      file_implementable<T>::impl (void) const
      {
        return static_cast<value_type&> (impl_);
      }
 
    // ========================================================================
 
    template<typename T, typename L>
      file_lockable<T, L>::file_lockable (class file_system& fs,
                                          lockable_type& locker) :
          file
            { impl_instance_ }, //
          impl_instance_
            { fs }, //
          locker_ (locker)
      {
#if defined(OS_TRACE_POSIX_IO_FILE)
        trace::printf ("file_lockable::%s()=@%p\n", __func__, this);
#endif
      }
 
    template<typename T, typename L>
      file_lockable<T, L>::~file_lockable ()
      {
#if defined(OS_TRACE_POSIX_IO_FILE)
        trace::printf ("file_lockable::%s() @%p\n", __func__, this);
#endif
      }
 
    // ------------------------------------------------------------------------
 
    template<typename T, typename L>
      int
      file_lockable<T, L>::close (void)
      {
        std::lock_guard<L> lock
          { locker_ };
 
        return file::close ();
      }
 
    template<typename T, typename L>
      ssize_t
      file_lockable<T, L>::read (void* buf, std::size_t nbyte)
      {
        std::lock_guard<L> lock
          { locker_ };
 
        return file::read (buf, nbyte);
      }
 
    template<typename T, typename L>
      ssize_t
      file_lockable<T, L>::write (const void* buf, std::size_t nbyte)
      {
        std::lock_guard<L> lock
          { locker_ };
 
        return file::write (buf, nbyte);
      }
 
    template<typename T, typename L>
      ssize_t
      file_lockable<T, L>::writev (const struct iovec* iov, int iovcnt)
      {
        std::lock_guard<L> lock
          { locker_ };
 
        return file::writev (iov, iovcnt);
      }
 
    template<typename T, typename L>
      int
      file_lockable<T, L>::vfcntl (int cmd, std::va_list args)
      {
        std::lock_guard<L> lock
          { locker_ };
 
        return file::vfcntl (cmd, args);
      }
 
    template<typename T, typename L>
      int
      file_lockable<T, L>::fstat (struct stat* buf)
      {
        std::lock_guard<L> lock
          { locker_ };
 
        return file::fstat (buf);
      }
 
    template<typename T, typename L>
      off_t
      file_lockable<T, L>::lseek (off_t offset, int whence)
      {
        std::lock_guard<L> lock
          { locker_ };
 
        return file::lseek (offset, whence);
      }
 
    template<typename T, typename L>
      int
      file_lockable<T, L>::ftruncate (off_t length)
      {
        std::lock_guard<L> lock
          { locker_ };
 
        return file::ftruncate (length);
      }
 
    template<typename T, typename L>
      int
      file_lockable<T, L>::fsync (void)
      {
        std::lock_guard<L> lock
          { locker_ };
 
        return file::fsync ();
      }
 
    template<typename T, typename L>
      typename file_lockable<T, L>::value_type&
      file_lockable<T, L>::impl (void) const
      {
        return static_cast<value_type&> (impl_);
      }
 
  // ==========================================================================
  } /* namespace posix */
} /* namespace os */
 
#pragma GCC diagnostic pop
 
// ----------------------------------------------------------------------------
 
#endif /* __cplusplus */
 
// ----------------------------------------------------------------------------
 
#endif /* CMSIS_PLUS_POSIX_IO_FILE_H_ */