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// -*- C++ -*-
//==========================================================================
/**
* @file Mem_Map.h
*
* $Id$
*
* @author Douglas C. Schmidt <schmidt@cs.wustl.edu>
*/
//==========================================================================
#ifndef ACE_MEM_MAP_H
#define ACE_MEM_MAP_H
#include "ace/pre.h"
#include "ace/ACE_export.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/OS.h"
/**
* @class ACE_Mem_Map
*
* @brief C++ interface OS memory mapping system call.
*
* This class works with both the mmap(2) UNIX system and the
* Win32 family of memory mapping system calls.
*/
class ACE_Export ACE_Mem_Map
{
public:
// = Initialization and termination methods.
/// Default constructor.
ACE_Mem_Map (void);
/// Map a file from an open file descriptor <handle>. This function
/// will lookup the length of the file if it is not given.
ACE_Mem_Map (ACE_HANDLE handle,
int length = -1,
int prot = PROT_RDWR,
int share = ACE_MAP_PRIVATE,
void *addr = 0,
off_t offset = 0,
LPSECURITY_ATTRIBUTES sa = 0);
/// Map a file specified by <file_name>.
ACE_Mem_Map (const ACE_TCHAR *filename,
int len = -1,
int flags = O_RDWR | O_CREAT,
int mode = ACE_DEFAULT_FILE_PERMS,
int prot = PROT_RDWR,
int share = ACE_MAP_PRIVATE,
void *addr = 0,
off_t offset = 0,
LPSECURITY_ATTRIBUTES sa = 0);
/// Map a file from an open file descriptor <handle>. This function
/// will lookup the length of the file if it is not given.
int map (ACE_HANDLE handle,
int length = -1,
int prot = PROT_RDWR,
int share = ACE_MAP_PRIVATE,
void *addr = 0,
off_t offset = 0,
LPSECURITY_ATTRIBUTES sa = 0);
/// Remap the file associated with <handle_>.
int map (int length = -1,
int prot = PROT_RDWR,
int share = ACE_MAP_PRIVATE,
void *addr = 0,
off_t offset = 0,
LPSECURITY_ATTRIBUTES sa = 0);
/// Map a file specified by <filename>.
int map (const ACE_TCHAR *filename,
int len = -1,
int flags = O_RDWR | O_CREAT,
int mode = ACE_DEFAULT_FILE_PERMS,
int prot = PROT_RDWR,
int share = ACE_MAP_PRIVATE,
void *addr = 0,
off_t offset = 0,
LPSECURITY_ATTRIBUTES sa = 0);
/// Destructor.
~ACE_Mem_Map (void);
/// Open the file without mapping it.
int open (const ACE_TCHAR *filename,
int flags = O_RDWR | O_CREAT,
int mode = ACE_DEFAULT_FILE_PERMS,
LPSECURITY_ATTRIBUTES sa = 0);
/// Close down the <handle_> if necessary and unmap the mapping.
int close (void);
/// Close down the <handle_> if necessary.
int close_handle (void);
/**
* Close down the internal <file_mapping_> if necessary. This is
* mostly necessary on Win32, which has a different handle for
* file-mapping kernel object.
*/
int close_filemapping_handle (void);
/// This operator passes back the starting address of the mapped
/// file.
int operator () (void *&addr);
/// Return the base address.
void *addr (void) const;
/// This function returns the number of bytes currently mapped in the
/// file.
size_t size (void) const;
/// Unmap the region starting at <base_addr_>.
int unmap (int len = -1);
/// Unmap the region starting at <addr_>.
int unmap (void *addr, int len);
/**
* Sync <len> bytes of the memory region to the backing store
* starting at <base_addr_>. If <len> == -1 then sync the whole
* region.
*/
int sync (ssize_t len = -1, int flags = MS_SYNC);
/// Sync <len> bytes of the memory region to the backing store
/// starting at <addr_>.
int sync (void *addr, size_t len, int flags = MS_SYNC);
/**
* Change the protection of the pages of the mapped region to <prot>
* starting at <base_addr_> up to <len> bytes. If <len> == -1 then
* change protection of all pages in the mapped region.
*/
int protect (ssize_t len = -1, int prot = PROT_RDWR);
/// Change the protection of the pages of the mapped region to <prot>
/// starting at <addr> up to <len> bytes.
int protect (void *addr, size_t len, int prot = PROT_RDWR);
/// Close and remove the file from the file system.
int remove (void);
/// Hook into the underlying VM system.
int advise (int behavior, int len = -1);
/// Return the underlying <handle_>.
ACE_HANDLE handle (void) const;
/// Return the name of file that is mapped (if any).
const ACE_TCHAR *filename (void) const;
/// Dump the state of an object.
void dump (void) const;
/// Declare the dynamic allocation hooks.
ACE_ALLOC_HOOK_DECLARE;
private:
/// Base address of the memory-mapped file.
void *base_addr_;
/// Name of the file that is mapped.
ACE_TCHAR filename_[MAXPATHLEN + 1];
/// Length of the mapping.
size_t length_;
/// HANDLE for the open file.
ACE_HANDLE handle_;
/// HANDLE for the open mapping.
ACE_HANDLE file_mapping_;
#if defined (__Lynx__)
/// Flag to indicate that PROT_WRITE has been enabled.
int write_enabled_;
#endif /* __Lynx__ */
/// Keeps track of whether we need to close the handle. This is set
/// if we opened the file.
int close_handle_;
/// This method does the dirty work of actually calling ::mmap to map
/// the file into memory.
int map_it (ACE_HANDLE handle,
int len = -1,
int prot = PROT_RDWR,
int share = MAP_SHARED,
void *addr = 0,
off_t offset = 0,
LPSECURITY_ATTRIBUTES sa = 0);
// = Disallow copying and assignment.
ACE_UNIMPLEMENTED_FUNC (ACE_Mem_Map (const ACE_Mem_Map &))
ACE_UNIMPLEMENTED_FUNC (void operator = (const ACE_Mem_Map &))
};
#if defined (__ACE_INLINE__)
#include "ace/Mem_Map.i"
#endif /* __ACE_INLINE__ */
#include "ace/post.h"
#endif /* ACE_MEM_MAP_H */
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