File Class Reference

#include <File.h>

Inheritance diagram for File:

Public Member Functions
virtual void	abort (void)
virtual void	attach (IOFD fd)
virtual void	close (void)
virtual void	create (const char *name, bool exclusive=false, int perms=0666)
virtual void	create (const std::string &name, bool exclusive=false, int perms=0666)
	File (void)
	File (IOFD fd, bool autoclose=true)
	File (const char *name, int flags=IOFlags::OpenRead, int perms=0666)
	File (const std::string &name, int flags=IOFlags::OpenRead, int perms=0666)
virtual void	flush (void)
virtual void	open (const char *name, int flags=IOFlags::OpenRead, int perms=0666)
virtual void	open (const std::string &name, int flags=IOFlags::OpenRead, int perms=0666)
virtual IOOffset	position (IOOffset offset, Relative whence=SET)
virtual bool	prefetch (const IOPosBuffer *what, IOSize n)
virtual IOSize	read (void *into, IOSize n)
virtual IOSize	read (void *into, IOSize n, IOOffset pos)
virtual IOSize	readv (IOBuffer *into, IOSize length)
virtual void	resize (IOOffset size)
virtual void	setAutoClose (bool closeit)
virtual IOOffset	size (void) const
virtual IOSize	write (const void *from, IOSize n)
virtual IOSize	write (const void *from, IOSize n, IOOffset pos)
virtual IOSize	writev (const IOBuffer *from, IOSize length)
	~File (void)
Public Member Functions inherited from IOChannel
virtual IOFD	fd (void) const
virtual void	fd (IOFD value)
	IOChannel (IOFD fd=-1)
virtual bool	isBlocking (void) const
virtual void	setBlocking (bool value)
virtual	~IOChannel (void)
Public Member Functions inherited from IOInput
int	read (void)
IOSize	read (IOBuffer into)
IOSize	xread (IOBuffer into)
IOSize	xread (void *into, IOSize n)
IOSize	xreadv (IOBuffer *into, IOSize buffers)
virtual	~IOInput (void)
	Destruct the stream. A no-op. More...
Public Member Functions inherited from IOOutput
IOSize	write (unsigned char byte)
IOSize	write (IOBuffer from)
IOSize	xwrite (const void *from, IOSize n)
IOSize	xwrite (IOBuffer from)
IOSize	xwritev (const IOBuffer *from, IOSize buffers)
virtual	~IOOutput (void)
	Destruct the stream. A no-op. More...
Public Member Functions inherited from Storage
virtual bool	eof (void) const
virtual IOOffset	position (void) const
IOSize	read (IOBuffer into, IOOffset pos)
virtual IOSize	readv (IOPosBuffer *into, IOSize buffers)
virtual void	rewind (void)
	Storage (void)
IOSize	write (IOBuffer from, IOOffset pos)
virtual IOSize	writev (const IOPosBuffer *from, IOSize buffers)
virtual	~Storage (void)

Private Types
enum	{ InternalAutoClose = 4096 }

Private Member Functions
File *	duplicate (bool copy) const
File *	duplicate (File *child) const
	File (IOFD fd, unsigned flags)

Static Private Member Functions
static bool	sysclose (IOFD fd, int *error=0)
static IOFD	sysduplicate (IOFD fd)
static void	sysopen (const char *name, int flags, int perms, IOFD &newfd, unsigned &newflags)

Private Attributes
unsigned	m_flags

Additional Inherited Members
Public Types inherited from Storage
enum	Relative { SET, CURRENT, END }
Protected Member Functions inherited from IOChannel
bool	sysclose (IOFD fd, int *error=0)

Detailed Description

Basic file-related functions. Nicked from SEAL.

Definition at line 11 of file File.h.

Member Enumeration Documentation

anonymous enum

private

Enumerator
InternalAutoClose

Definition at line 63 of file File.h.

{ InternalAutoClose = 4096 }; //< Close on delete

Constructor & Destructor Documentation

File::File

(

void

)

Create a new file object without a file attached to it.

Definition at line 57 of file File.cc.

References EDM_IOFD_INVALID.

{
  fd (EDM_IOFD_INVALID);
  m_flags = 0;
}

File::File	(	IOFD	fd,
		bool	autoclose = true
	)

Create a new file object from a file descriptor. The descriptor will be closed automatically when the file object is destructed if autoclose is true (the default).

Definition at line 66 of file File.cc.

{
  this->fd (fd);
  m_flags = autoclose ? InternalAutoClose : 0;
}

File::File	(	const char *	name,
		int	flags = IOFlags::OpenRead,
		int	perms = 0666
	)

Create a new file object by calling open() with the given arguments.

Definition at line 80 of file File.cc.

{ open (name, flags, perms); }

File::File	(	const std::string &	name,
		int	flags = IOFlags::OpenRead,
		int	perms = 0666
	)

Create a new file object by calling open() with the given arguments.

Definition at line 84 of file File.cc.

References flags.

{ open (name.c_str (), flags, perms); }

File::~File

(

void

)

Release the resources held by the file object. If the object holds a valid file descriptor given to it through the constructor or obtained by calling open(), the descriptor will be closed.

Definition at line 90 of file File.cc.

{
  if (m_flags & InternalAutoClose)
    abort ();
}

File::File ( IOFD  fd, unsigned  flags  )

private

Internal function for copying file objects to retain the state flags.

Definition at line 73 of file File.cc.

References flags.

{
  this->fd (fd);
  m_flags = flags;
}

Member Function Documentation

void File::abort ( void  )

virtual

Close the file and ignore all errors.

Reimplemented in RemoteFile.

Definition at line 293 of file File.cc.

References EDM_IOFD_INVALID.

Referenced by RemoteFile::abort().

{
  IOFD fd = this->fd ();
  if (fd != EDM_IOFD_INVALID)
  {
    sysclose (fd);
    m_flags &= ~InternalAutoClose;
    this->fd (EDM_IOFD_INVALID);
  }
}

void File::attach ( IOFD  fd )

virtual

Definition at line 201 of file File.cc.

{
  this->fd (fd);
  m_flags = 0;
}

void File::close ( void  )

virtual

Close the file.

Reimplemented from IOChannel.

Reimplemented in RemoteFile.

Definition at line 277 of file File.cc.

References EDM_IOFD_INVALID, relativeConstraints::error, and throwStorageError().

Referenced by RemoteFile::close(), lumiQTWidget.ApplicationWindow::fileQuit(), esMonitoring.AsyncLineReaderMixin::handle_close(), esMonitoring.FDJsonServer::handle_close(), Vispa.Gui.BoxContentDialog.BoxContentDialog::keyPressEvent(), and Vispa.Gui.FindDialog.FindDialog::keyPressEvent().

{
  IOFD fd = this->fd ();
  assert (fd != EDM_IOFD_INVALID);

  int error;
  if (! sysclose (fd, &error))
    throwStorageError("FileCloseError", "Calling File::close()",
                      "sysclose", error);

  m_flags &= ~InternalAutoClose;
  this->fd (EDM_IOFD_INVALID);
}

void File::create ( const char *  name, bool  exclusive = false, int  perms = 0666  )

virtual

Create and open the file name in write mode. If exclusive, the creation fails if the file already exists, otherwise if the file exists, it will be truncated. The new file will have the permissions perms.

Definition at line 142 of file File.cc.

References IOFlags::OpenCreate, IOFlags::OpenExclusive, IOFlags::OpenTruncate, and IOFlags::OpenWrite.

{
  open (name,
    (OpenCreate | OpenWrite | OpenTruncate
     | (exclusive ? OpenExclusive : 0)),
    perms);
}

void File::create ( const std::string &  name, bool  exclusive = false, int  perms = 0666  )

virtual

Create and open the file name in write mode. If exclusive, the creation fails if the file already exists, otherwise if the file exists, it will be truncated. The new file will have the permissions perms.

Definition at line 155 of file File.cc.

References IOFlags::OpenCreate, IOFlags::OpenExclusive, IOFlags::OpenTruncate, and IOFlags::OpenWrite.

{
  open (name.c_str (),
    (OpenCreate | OpenWrite | OpenTruncate
     | (exclusive ? OpenExclusive : 0)),
    perms);
}

File * File::duplicate ( bool  copy ) const

private

Duplicate the file object. If copy, also duplicates the underlying file descriptor, otherwise the two will point to the same descriptor. If the file descriptor is not copied, the copy will not close its file descriptor on destruction, the original object (this) will.

Definition at line 117 of file File.cc.

References trackingPlots::dup, and ecalTB2006H4_GenSimDigiReco_cfg::File.

{
  File *dup = new File (fd (), copy ? m_flags : 0);
  return copy ? this->duplicate (dup) : dup;
}

File * File::duplicate ( File *  child ) const

private

Internal implementation of duplicate() to actually duplicate the file handle into child.

Definition at line 126 of file File.cc.

References class-composition::child, EDM_IOFD_INVALID, IOChannel::fd(), and m_flags.

{
  IOFD fd = this->fd ();
  assert (fd != EDM_IOFD_INVALID);
  assert (child);
  child->fd (sysduplicate (fd));
  child->m_flags = m_flags;
  return child;
}

void File::flush ( void  )

virtual

Flush the system's file system buffers for this file.

Reimplemented from Storage.

Definition at line 140 of file UnixFile.cc.

References EDM_IOFD_INVALID, and throwStorageError().

{
  IOFD fd = this->fd ();
  assert (fd != EDM_IOFD_INVALID);

#if _POSIX_SYNCHRONIZED_IO > 0
  if (fdatasync (fd) == -1)
    throwStorageError("FileFlushError", "Calling File::flush()", "fdatasync()", errno);
#elif _POSIX_FSYNC > 0
  if (fsync (fd) == -1)
    throwStorageError("FileFlushError", "Calling File::flush()", "fsync()", errno);
#endif
}

void File::open ( const char *  name, int  flags = IOFlags::OpenRead, int  perms = 0666  )

virtual

Open or possibly create the file name with options specified in flags. If the file is to be created, it will be given the permissions perms. If this object already has a file open, it is closed first.

Definition at line 177 of file File.cc.

References EDM_IOFD_INVALID, IOFlags::OpenRead, and IOFlags::OpenWrite.

{
  // is zero and always implied.  OTOH, existence check should be
  // done with Filename::exists() -- see comments there about what
  // can happen on a WIN32 remote share even if the file doesn't
  // exist.  For now make sure that read or write was asked for.

  assert (name && *name);
  assert (flags & (OpenRead | OpenWrite));

  // If I am already open, close the old file first.
  if (fd () != EDM_IOFD_INVALID && (m_flags & InternalAutoClose))
    close ();
    
  IOFD      newfd = EDM_IOFD_INVALID;
  unsigned  newflags = InternalAutoClose;

  sysopen (name, flags, perms, newfd, newflags);

  fd (newfd);
  m_flags = newflags;
}

void File::open ( const std::string &  name, int  flags = IOFlags::OpenRead, int  perms = 0666  )

virtual

Open or possibly create the file name with options specified in flags. If the file is to be created, it will be given the permissions perms. If this object already has a file open, it is closed first. Redirected to the overloaded method taking a "const char *" argument.

Definition at line 169 of file File.cc.

References flags.

{ open (name.c_str (), flags, perms); }

IOOffset File::position ( IOOffset  offset, Relative  whence = SET  )

virtual

Return the current file pointer position.

Implements Storage.

Definition at line 113 of file UnixFile.cc.

References EDM_IOFD_INVALID, mps_fire::result, and throwStorageError().

{
  IOFD fd = this->fd ();
  assert (fd != EDM_IOFD_INVALID);
  assert (whence == CURRENT || whence == SET || whence == END);

  IOOffset result;
  int      mywhence = (whence == SET ? SEEK_SET
               : whence == CURRENT ? SEEK_CUR
               : SEEK_END);
  if ((result = ::lseek (fd, offset, mywhence)) == -1)
    throwStorageError("FilePositionError", "Calling File::position()", "lseek()", errno);

  return result;
}

bool File::prefetch ( const IOPosBuffer *  what, IOSize  n  )

virtual

Prefetch data for the file.

Reimplemented from Storage.

Definition at line 210 of file File.cc.

References mps_fire::i, info(), gen::n, IOPosBuffer::offset(), PFRecoTauDiscriminationByIsolation_cfi::offset, IOPosBuffer::size(), and findQualityFiles::size.

{
  IOFD fd = this->fd();
  for (IOSize i = 0; i < n; ++i)
  {
#if F_RDADVISE
    radvisory info;
    info.ra_offset = what[i].offset();
    info.ra_count = what[i].size();
    fcntl(fd, F_RDADVISE, &info);
#elif _POSIX_ADVISORY_INFO > 0
    posix_fadvise(fd, what[i].offset(), what[i].size(), POSIX_FADV_WILLNEED);
#else
# error advisory read ahead not available on this platform
#endif
  }
  return true;
}

IOSize File::read ( void *  into, IOSize  n  )

virtual

Read from the file.

Reimplemented from IOChannel.

Definition at line 231 of file File.cc.

References IOInput::read().

{ return IOChannel::read (into, n); }

IOSize File::read ( void *  into, IOSize  n, IOOffset  pos  )

virtual

Reimplemented from Storage.

Definition at line 64 of file UnixFile.cc.

References edm::errors::FileReadError, alignCSCRings::s, and throwStorageError().

{
  assert (pos >= 0);

  ssize_t s;
  do
    s = ::pread (fd (), into, n, pos);
  while (s == -1 && errno == EINTR);

  if (s == -1)
    throwStorageError(edm::errors::FileReadError, "Calling File::read()", "pread()", errno);

  return s;
}

IOSize File::readv ( IOBuffer *  into, IOSize  length  )

virtual

Read from the file.

Reimplemented from IOChannel.

Definition at line 236 of file File.cc.

References IOChannel::readv().

{ return IOChannel::readv (into, length); }

void File::resize ( IOOffset  size )

virtual

Resize to the file to size. If size is less than the file's current size, the file is truncated. If size is larger than the file's current size, the file is extended with zero bytes. Does not change the current file pointer.

Implements Storage.

Definition at line 130 of file UnixFile.cc.

References EDM_IOFD_INVALID, and throwStorageError().

Referenced by Vispa.Gui.TextDialog.TextDialog::__init__(), Vispa.Plugins.ConfigEditor.ToolDialog.ToolDialog::__init__(), Vispa.Main.MainWindow.MainWindow::_loadIni(), and Vispa.Gui.PortConnection.PointToPointConnection::updateConnection().

{
  IOFD fd = this->fd ();
  assert (fd != EDM_IOFD_INVALID);

  if (ftruncate (fd, size) == -1)
    throwStorageError("FileResizeError", "Calling File::resize()", "ftruncate()", errno);
}

void File::setAutoClose ( bool  autoclose )

virtual

Set the autoclose flag of the file. If autoclose is true, the destructor will automatically try to close the underlying file descriptor. Otherwise the file descriptor will be left open. Set the flag off if the file descriptor is originally owned by someone else.

Definition at line 103 of file File.cc.

{
  m_flags &= ~InternalAutoClose;
  if (autoclose)
    m_flags |= InternalAutoClose;
}

IOOffset File::size ( void  ) const

virtual

Get the size of the file.

Reimplemented from Storage.

Definition at line 100 of file UnixFile.cc.

References EDM_IOFD_INVALID, and throwStorageError().

Referenced by ntupleDataFormat._Collection::__iter__(), and ntupleDataFormat._Collection::__len__().

{
  IOFD fd = this->fd ();
  assert (fd != EDM_IOFD_INVALID);

  struct stat info;
  if (fstat (fd, &info) == -1)
    throwStorageError("FileSizeError", "Calling File::size()", "fstat()", errno);

  return info.st_size;
}

bool File::sysclose ( IOFD  fd, int *  error = 0  )

staticprivate

Actually close a file handle and return error code.

Definition at line 155 of file UnixFile.cc.

{
  int ret = ::close (fd);
  if (error) *error = errno;
  return ret != -1;
}

IOFD File::sysduplicate ( IOFD  fd )

staticprivate

Definition at line 10 of file UnixFile.cc.

References trackingPlots::dup, EDM_IOFD_INVALID, and throwStorageError().

{
  IOFD copyfd;
  if ((copyfd = ::dup (fd)) == EDM_IOFD_INVALID)
    throwStorageError ("FileDuplicateError", "Calling File::sysduplicate()", "dup()", errno);

  return copyfd;
}

void File::sysopen ( const char *  name, int  flags, int  perms, IOFD &  newfd, unsigned &  newflags  )

staticprivate

Definition at line 20 of file UnixFile.cc.

References edm::errors::FileOpenError, O_NONBLOCK, IOFlags::OpenAppend, IOFlags::OpenCreate, IOFlags::OpenExclusive, IOFlags::OpenNonBlock, IOFlags::OpenNotCTTY, IOFlags::OpenRead, IOFlags::OpenTruncate, IOFlags::OpenUnbuffered, IOFlags::OpenWrite, and throwStorageError().

{
  // Translate our flags to system flags.
  int openflags = 0;

  if ((flags & OpenRead) && (flags & OpenWrite))
    openflags |= O_RDWR;
  else if (flags & OpenRead)
    openflags |= O_RDONLY;
  else if (flags & OpenWrite)
    openflags |= O_WRONLY;

  if (flags & OpenNonBlock)
    openflags |= O_NONBLOCK;

  if (flags & OpenAppend)
    openflags |= O_APPEND;

#ifdef O_SYNC
  if (flags & OpenUnbuffered)
    openflags |= O_SYNC;
#else
  if (flags & OpenUnbuffered)
    newflags |= OpenUnbuffered;
#endif

  if (flags & OpenCreate)
    openflags |= O_CREAT;

  if (flags & OpenExclusive)
    openflags |= O_EXCL;

  if (flags & OpenTruncate)
    openflags |= O_TRUNC;

  if (flags & OpenNotCTTY)
    openflags |= O_NOCTTY;

  if ((newfd = ::open (name, openflags, perms)) == -1)
    throwStorageError (edm::errors::FileOpenError, "Calling File::sysopen()", "open()", errno);
}

IOSize File::write ( const void *  from, IOSize  n  )

virtual

Write to the file.

Reimplemented from IOChannel.

Definition at line 241 of file File.cc.

References IOFlags::OpenAppend, IOFlags::OpenUnbuffered, position, alignCSCRings::s, and IOChannel::write().

{
  // FIXME: This may create a race condition or cause trouble on
  // remote files.  Should be currently needed only on WIN32.
  if (m_flags & OpenAppend)
    position (0, END);

  IOSize s = IOChannel::write (from, n);

  if (m_flags & OpenUnbuffered)
    // FIXME: Exception handling?
    flush ();

  return s;
}

IOSize File::write ( const void *  from, IOSize  n, IOOffset  pos  )

virtual

Reimplemented from Storage.

Definition at line 80 of file UnixFile.cc.

References IOFlags::OpenUnbuffered, alignCSCRings::s, and throwStorageError().

{
  assert (pos >= 0);

  ssize_t s;
  do
    s = ::pwrite (fd (), from, n, pos);
  while (s == -1 && errno == EINTR);

  if (s == -1)
    throwStorageError("FileWriteError", "Calling File::write()", "pwrite()", errno);

  if (m_flags & OpenUnbuffered)
    // FIXME: Exception handling?
    flush ();

  return s;
}

IOSize File::writev ( const IOBuffer *  from, IOSize  length  )

virtual

Write to the file.

Reimplemented from IOChannel.

Definition at line 259 of file File.cc.

References IOFlags::OpenAppend, IOFlags::OpenUnbuffered, position, alignCSCRings::s, and IOChannel::writev().

{
  // FIXME: This may create a race condition or cause trouble on
  // remote files.  Should be currently needed only on WIN32.
  if (m_flags & OpenAppend)
    position (0, END);

  IOSize s = IOChannel::writev (from, length);

  if (m_flags & OpenUnbuffered)
    // FIXME: Exception handling?
    flush ();

  return s;
}

Member Data Documentation

unsigned File::m_flags

private

Definition at line 74 of file File.h.

Referenced by duplicate().