file-descriptors-manager.h

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/*
 * This file is part of the µOS++ project (https://micro-os-plus.github.io/).
 * Copyright (c) 2015-2025 Liviu Ionescu. All rights reserved.
 *
 * Permission to use, copy, modify, and/or distribute this software
 * for any purpose is hereby granted, under the terms of the MIT license.
 *
 * If a copy of the license was not distributed with this file, it can
 * be obtained from https://opensource.org/licenses/mit.
 */
 
#ifndef CMSIS_PLUS_POSIX_IO_FILE_DESCRIPTORS_MANAGER_H_
#define CMSIS_PLUS_POSIX_IO_FILE_DESCRIPTORS_MANAGER_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/types.h>
 
#include <cstddef>
#include <cassert>
 
// ----------------------------------------------------------------------------
 
#pragma GCC diagnostic push
#if defined(__clang__)
#pragma clang diagnostic ignored "-Wc++98-compat"
#pragma clang diagnostic ignored "-Wdocumentation-unknown-command"
#endif
 
// ----------------------------------------------------------------------------
 
namespace os
{
  namespace posix
  {
 
    // ------------------------------------------------------------------------
 
    class io;
    class socket;
 
    // ========================================================================
 
    class file_descriptors_manager
    {
      // ----------------------------------------------------------------------
 
    public:
      file_descriptors_manager (std::size_t size);
 
      // The rule of five.
      file_descriptors_manager (const file_descriptors_manager&) = delete;
      file_descriptors_manager (file_descriptors_manager&&) = delete;
      file_descriptors_manager&
      operator= (const file_descriptors_manager&)
          = delete;
      file_descriptors_manager&
      operator= (file_descriptors_manager&&)
          = delete;
 
      ~file_descriptors_manager ();
 
      // ----------------------------------------------------------------------
    public:
      static size_t
      size (void);
 
      static bool
      valid (int fildes);
 
#pragma GCC diagnostic push
#if defined(__clang__)
#elif defined(__GNUC__)
#pragma GCC diagnostic ignored "-Wredundant-tags"
#endif
 
      static class io*
      io (int fildes);
 
      static class socket*
      socket (int fildes);
 
#pragma GCC diagnostic pop
 
      static int
      allocate (class io* io);
 
      static int
      assign (file_descriptor_t fildes, class io* io);
 
      static int
      deallocate (file_descriptor_t fildes);
 
      static size_t
      used (void);
 
      // ----------------------------------------------------------------------
    private:
      // Reserve 0, 1, 2 (stdin, stdout, stderr).
      static constexpr std::size_t reserved__ = 3;
 
      static std::size_t size__;
 
      static class io** descriptors_array__;
 
    };
 
    // ========================================================================
  } /* namespace posix */
} /* namespace os */
 
// ===== Inline & template implementations ====================================
 
namespace os
{
  namespace posix
  {
    // ========================================================================
 
    inline size_t
    file_descriptors_manager::size (void)
    {
      return size__;
    }
 
    // ========================================================================
  } /* namespace posix */
} /* namespace os */
 
#pragma GCC diagnostic pop
 
// ----------------------------------------------------------------------------
 
#endif /* __cplusplus */
 
// ----------------------------------------------------------------------------
 
#endif /* CMSIS_PLUS_POSIX_IO_FILE_DESCRIPTORS_MANAGER_H_ */