file.cpp

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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.
 */
 
#if defined(OS_USE_OS_APP_CONFIG_H)
#include <cmsis-plus/os-app-config.h>
#endif
 
#include <cmsis-plus/posix-io/file.h>
#include <cmsis-plus/posix-io/file-system.h>
 
#include <cmsis-plus/diag/trace.h>
 
#include <cerrno>
 
// ----------------------------------------------------------------------------
 
#if defined(__clang__)
#pragma clang diagnostic ignored "-Wc++98-compat"
#endif
 
// ----------------------------------------------------------------------------
 
namespace os
{
  namespace posix
  {
    // ========================================================================
 
    file::file (file_impl& impl) : io{ impl, type::file }
    {
#if defined(OS_TRACE_POSIX_IO_FILE)
      trace::printf ("file::%s()=%p\n", __func__, this);
#endif
    }
 
    file::~file ()
    {
#if defined(OS_TRACE_POSIX_IO_FILE)
      trace::printf ("file::%s() @%p\n", __func__, this);
#endif
    }
 
    // ------------------------------------------------------------------------
 
    int
    file::close (void)
    {
#if defined(OS_TRACE_POSIX_IO_FILE)
      trace::printf ("file::%s() @%p\n", __func__, this);
#endif
 
      int ret = io::close ();
 
      // Note: the constructor is not called here.
 
      // Link the file object to a list kept by the file system.
      // It will be deallocated at the next open.
      get_file_system ().add_deferred_file (this);
 
      return ret;
    }
 
    int
    file::ftruncate (off_t length)
    {
#if defined(OS_TRACE_POSIX_IO_FILE)
      trace::printf ("file::%s(%u) @%p\n", __func__, length, this);
#endif
 
      if (length < 0)
        {
          errno = EINVAL;
          return -1;
        }
 
      errno = 0;
 
      // Execute the implementation specific code.
      return impl ().do_ftruncate (length);
    }
 
    int
    file::fsync (void)
    {
#if defined(OS_TRACE_POSIX_IO_FILE)
      trace::printf ("file::%s() @%p\n", __func__, this);
#endif
 
      errno = 0;
 
      // Execute the implementation specific code.
      return impl ().do_fsync ();
    }
 
    int
    file::fstatvfs (struct statvfs* buf)
    {
#if defined(OS_TRACE_POSIX_IO_FILE)
      trace::printf ("file::%s(%p) @%p\n", __func__, buf, this);
#endif
 
      errno = 0;
 
      // Execute the file system code. Might be locked there.
      return get_file_system ().statvfs (buf);
    }
 
    // ========================================================================
 
    file_impl::file_impl (/* class */ file_system& fs) : file_system_ (fs)
    {
#if defined(OS_TRACE_POSIX_IO_FILE)
      trace::printf ("file_impl::%s()=%p\n", __func__, this);
#endif
    }
 
    file_impl::~file_impl ()
    {
#if defined(OS_TRACE_POSIX_IO_FILE)
      trace::printf ("file_impl::%s() @%p\n", __func__, this);
#endif
    }
 
    // ------------------------------------------------------------------------
 
#pragma GCC diagnostic push
#if defined(__clang__)
#pragma clang diagnostic ignored "-Wunused-parameter"
#elif defined(__GNUC__)
#pragma GCC diagnostic ignored "-Wunused-parameter"
#endif
 
    int
    file_impl::do_ftruncate (off_t length)
    {
      errno = ENOSYS; // Not implemented
      return -1;
    }
 
#pragma GCC diagnostic pop
 
    int
    file_impl::do_fsync (void)
    {
      errno = ENOSYS; // Not implemented
      return -1;
    }
 
    // ========================================================================
  } /* namespace posix */
} /* namespace os */
 
// ----------------------------------------------------------------------------