int
ACE_FILE_Connector::connect (ACE_FILE_IO &new_io,
const ACE_FILE_Addr &remote_sap,
ACE_Time_Value *timeout,
const ACE_Addr &,
int,
int flags,
int perms)
{
ACE_TRACE ("ACE_FILE_Connector::connect");
ACE_ASSERT (new_io.get_handle () == ACE_INVALID_HANDLE);
ACE_HANDLE handle = ACE_INVALID_HANDLE;
// Check to see if caller has requested that we create the filename.
if(reinterpret_cast<const ACE_Addr &> (
const_cast<ACE_FILE_Addr &> (remote_sap)) == ACE_Addr::sap_any)
{
// Create a new temporary file.
// Use ACE_OS::mkstemp() if it is available since it avoids a
// race condition, and subsequently a security hole due to that
// race condition (specifically, a denial-of-service attack).
//
// However, using mkstemp() prevents us from doing a timed open
// since it opens the file for us. Better to avoid the race
// condition.
char filename[] = "ace-file-XXXXXX";
handle = ACE_OS::mkstemp (filename); // mkstemp() replaces "XXXXXX"
if(handle == ACE_INVALID_HANDLE
|| new_io.addr_.set (ACE_TEXT_CHAR_TO_TCHAR (filename)) != 0)
return -1;
new_io.set_handle (handle);
return 0;
}
else
new_io.addr_ = remote_sap; // class copy.
handle = ACE::handle_timed_open (timeout,
new_io.addr_.get_path_name (),
flags,
perms);
new_io.set_handle (handle);
return handle == ACE_INVALID_HANDLE ? -1 : 0;
}
int FileIOHandler::Connect()
{
int result = 0;
// create an empty temporary file for the test
if(connector_.connect(peer_,
ACE_sap_any_cast (ACE_FILE_Addr &)) != 0)
{
ACE_ERROR((LM_ERROR, ACE_TEXT("%p\n"),
ACE_TEXT("FileIOHandler connect failed to create file")));
result = -1;
}
// close opened file but leave it where it is
if (peer_.close () != 0)
{
ACE_ERROR((LM_ERROR, ACE_TEXT("%p\n"),
ACE_TEXT("FileIOHandler connect failed to close file")));
peer_.remove ();
result = -1;
}
// get file address
ACE_FILE_Addr tmp_addr;
peer_.get_local_addr (tmp_addr);
// reopen new file for asynch IO
if(connector_.connect(peer_,
tmp_addr,
0, //timeout
ACE_Addr::sap_any,
0, //reuse
O_RDWR |FILE_FLAG_OVERLAPPED) != 0)
{
ACE_ERROR((LM_ERROR, ACE_TEXT("%p\n"),
ACE_TEXT("FileIOHandler connect failed to open file")));
peer_.remove ();
result = -1;
}
else // device connected successfully
{
// keep track of our writes for offset calculations (can't use O_APPEND since
// this is not supported for the Win32_Asynch implementation) and data verifications
this->block_count_ = 0; // start counting
// Set our I/O handle to that of the peer_ object handling our connection
handle(peer_.get_handle());
if (writer_.open(*this) != 0 || reader_.open(*this) != 0)
{
ACE_ERROR(
(LM_ERROR, ACE_TEXT("%p\n"), ACE_TEXT("FileIOHandler reader or writer open failed")));
result = -1;
}
else // reader and writer opened successfully
{
// Allocate a new message block and initiate a read operation on it
// to prime the asynchronous read pipeline
// The message block is sized for the largest message we expect
ACE_Message_Block *mb;
ACE_NEW_NORETURN(mb, ACE_Message_Block(FILE_FRAME_SIZE));
if (reader_.read(*mb, mb->space()) != 0)
{
int errnr = ACE_OS::last_error ();
ACE_DEBUG(
(LM_INFO, ACE_TEXT("%p [%d]\n"), ACE_TEXT("FileIOHandler begin read failed"), errnr));
mb->release();
#if defined (ACE_WIN32)
// On older Win32 versions (WinXP, Win2003/2008) asynch IO with disk files is not
// reliable and may perform sync IO in certain cases like when the read offset denotes
// current end of file. Instead of scheduling a write operation the read will immediately
// return with an EOF error.
// We circumvent that situation here by not reporting an error and scheduling a read operation
// later when we are sure data has been written at the offset in question (after the write finishes).
if (errnr != ERROR_HANDLE_EOF)
#endif
result = -1;
}
#if defined (ACE_WIN32)
else
{
this->read_pending_ = true;
}
#endif
// If read worked, psMsg is now controlled by Proactor framework.
}
}
return result;
}
