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// Mem_Map.cpp
// $Id$
// Defines the member functions for the memory mapping facility.
#define ACE_BUILD_DLL
#include "ace/Mem_Map.h"
#if !defined (__ACE_INLINE__)
#include "ace/Mem_Map.i"
#endif /* __ACE_INLINE__ */
ACE_ALLOC_HOOK_DEFINE(ACE_Mem_Map)
void
ACE_Mem_Map::dump (void) const
{
ACE_TRACE ("ACE_Mem_Map::dump");
ACE_DEBUG ((LM_DEBUG, ACE_BEGIN_DUMP, this));
ACE_DEBUG ((LM_DEBUG, "base_addr_ = %x", this->base_addr_));
ACE_DEBUG ((LM_DEBUG, "\nfilename_ = %s", this->filename_));
ACE_DEBUG ((LM_DEBUG, "\nlength_ = %d", this->length_));
ACE_DEBUG ((LM_DEBUG, "\nhandle_ = %d", this->handle_));
ACE_DEBUG ((LM_DEBUG, "\nfile_mapping_ = %d", this->file_mapping_));
ACE_DEBUG ((LM_DEBUG, "\nclose_handle_ = %d", this->close_handle_));
ACE_DEBUG ((LM_DEBUG, ACE_END_DUMP));
}
int
ACE_Mem_Map::close (void)
{
ACE_TRACE ("ACE_Mem_Map::close");
this->unmap ();
if (this->file_mapping_ != this->handle_)
ACE_OS::close (this->file_mapping_);
if (this->close_handle_)
return ACE_OS::close (this->handle_);
return 0;
}
ACE_Mem_Map::~ACE_Mem_Map (void)
{
ACE_TRACE ("ACE_Mem_Map::~ACE_Mem_Map");
this->close ();
}
// This function does the dirty work of actually calling ACE_OS::mmap
// to map the file into memory.
int
ACE_Mem_Map::map_it (ACE_HANDLE handle,
int len_request,
int prot,
int share,
void *addr,
off_t pos)
{
ACE_TRACE ("ACE_Mem_Map::map_it");
this->base_addr_ = addr;
this->handle_ = handle;
long file_len = ACE_OS::filesize (this->handle_);
if (file_len == -1)
return -1;
if (this->length_ < size_t (file_len))
{
// If the length of the mapped region is less than the length of
// the file then we force a complete new remapping by setting
// the descriptor to ACE_INVALID_HANDLE (closing down the
// descriptor if necessary).
if (this->file_mapping_ != this->handle_)
ACE_OS::close (this->file_mapping_);
this->file_mapping_ = ACE_INVALID_HANDLE;
}
// At this point we know <file_len> is not negative...
this->length_ = size_t (file_len);
if (len_request == -1)
len_request = 0;
if ((this->length_ == 0 && len_request > 0)
|| this->length_ < size_t (len_request))
{
this->length_ = len_request;
// Extend the backing store.
if (ACE_OS::lseek (this->handle_,
len_request > 0 ? len_request - 1 : 0,
SEEK_SET) == -1
|| ACE_OS::write (this->handle_, "", 1) == -1
|| ACE_OS::lseek (this->handle_, 0, SEEK_SET) == -1)
return -1;
}
this->base_addr_ = ACE_OS::mmap (this->base_addr_,
this->length_,
prot,
share,
this->handle_,
off_t (ACE::round_to_pagesize (pos)),
&this->file_mapping_);
return this->base_addr_ == MAP_FAILED ? -1 : 0;
}
int
ACE_Mem_Map::open (LPCTSTR file_name,
int flags,
int mode)
{
ACE_TRACE ("ACE_Mem_Map::open");
ACE_OS::strncpy (this->filename_, file_name, MAXPATHLEN);
this->handle_ = ACE_OS::open (file_name, flags, mode);
if (this->handle_ == ACE_INVALID_HANDLE)
return -1;
else
{
this->close_handle_ = 1;
return 0;
}
}
int
ACE_Mem_Map::map (LPCTSTR file_name,
int len,
int flags,
int mode,
int prot,
int share,
void *addr,
off_t pos)
{
ACE_TRACE ("ACE_Mem_Map::map");
this->length_ = 0;
if (this->open (file_name, flags, mode) == -1)
return -1;
else
return this->map_it (this->handle (), len, prot, share, addr, pos);
}
ACE_Mem_Map::ACE_Mem_Map (void)
: base_addr_ (0),
length_ (0),
handle_ (ACE_INVALID_HANDLE),
file_mapping_ (ACE_INVALID_HANDLE),
close_handle_ (0)
{
ACE_TRACE ("ACE_Mem_Map::ACE_Mem_Map");
ACE_OS::memset (this->filename_, 0, sizeof this->filename_);
}
// Map a file specified by FILE_NAME.
ACE_Mem_Map::ACE_Mem_Map (LPCTSTR file_name,
int len,
int flags,
int mode,
int prot,
int share,
void *addr,
off_t pos)
: base_addr_ (0),
file_mapping_ (ACE_INVALID_HANDLE),
close_handle_ (0)
{
ACE_TRACE ("ACE_Mem_Map::ACE_Mem_Map");
if (this->map (file_name, len, flags, mode, prot, share, addr, pos) < 0)
ACE_ERROR ((LM_ERROR, "%p\n", "ACE_Mem_Map::ACE_Mem_Map"));
}
// 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_Mem_Map (ACE_HANDLE handle,
int len,
int prot,
int share,
void *addr,
off_t pos)
: file_mapping_ (ACE_INVALID_HANDLE),
close_handle_ (0)
{
ACE_TRACE ("ACE_Mem_Map::ACE_Mem_Map");
ACE_OS::memset (this->filename_, 0, sizeof this->filename_);
if (this->map (handle, len, prot, share, addr, pos) < 0)
ACE_ERROR ((LM_ERROR, "%p\n", "ACE_Mem_Map::ACE_Mem_Map"));
}
// Close down and remove the file from the file system.
int
ACE_Mem_Map::remove (void)
{
ACE_TRACE ("ACE_Mem_Map::remove");
ACE_OS::ftruncate (this->handle_, 0);
this->close ();
if (this->filename_[0] != '\0')
return ACE_OS::unlink (this->filename_);
else
return 0;
}
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