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/* Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
#include "vio_priv.h"
#ifdef _WIN32
/*
Disable posting IO completion event to the port.
In some cases (synchronous timed IO) we want to skip IOCP notifications.
*/
static void disable_iocp_notification(OVERLAPPED *overlapped)
{
HANDLE *handle = &(overlapped->hEvent);
*handle = ((HANDLE)((ULONG_PTR) *handle|1));
}
/* Enable posting IO completion event to the port */
static void enable_iocp_notification(OVERLAPPED *overlapped)
{
HANDLE *handle = &(overlapped->hEvent);
*handle = (HANDLE)((ULONG_PTR) *handle & ~1);
}
static size_t wait_overlapped_result(Vio *vio, int timeout)
{
size_t ret= (size_t) -1;
DWORD transferred, wait_status, timeout_ms;
timeout_ms= timeout >= 0 ? timeout : INFINITE;
/* Wait for the overlapped operation to be completed. */
wait_status= WaitForSingleObject(vio->overlapped.hEvent, timeout_ms);
/* The operation might have completed, attempt to retrieve the result. */
if (wait_status == WAIT_OBJECT_0)
{
/* If retrieval fails, a error code will have been set. */
if (GetOverlappedResult(vio->hPipe, &vio->overlapped, &transferred, FALSE))
ret= transferred;
}
else
{
/* Error or timeout, cancel the pending I/O operation. */
CancelIo(vio->hPipe);
/*
If the wait timed out, set error code to indicate a
timeout error. Otherwise, wait_status is WAIT_FAILED
and extended error information was already set.
*/
if (wait_status == WAIT_TIMEOUT)
SetLastError(SOCKET_ETIMEDOUT);
}
return ret;
}
size_t vio_read_pipe(Vio *vio, uchar *buf, size_t count)
{
DWORD transferred;
size_t ret= (size_t) -1;
DBUG_ENTER("vio_read_pipe");
disable_iocp_notification(&vio->overlapped);
/* Attempt to read from the pipe (overlapped I/O). */
if (ReadFile(vio->hPipe, buf, (DWORD)count, &transferred, &vio->overlapped))
{
/* The operation completed immediately. */
ret= transferred;
}
/* Read operation is pending completion asynchronously? */
else if (GetLastError() == ERROR_IO_PENDING)
ret= wait_overlapped_result(vio, vio->read_timeout);
enable_iocp_notification(&vio->overlapped);
DBUG_RETURN(ret);
}
size_t vio_write_pipe(Vio *vio, const uchar *buf, size_t count)
{
DWORD transferred;
size_t ret= (size_t) -1;
DBUG_ENTER("vio_write_pipe");
disable_iocp_notification(&vio->overlapped);
/* Attempt to write to the pipe (overlapped I/O). */
if (WriteFile(vio->hPipe, buf, (DWORD)count, &transferred, &vio->overlapped))
{
/* The operation completed immediately. */
ret= transferred;
}
/* Write operation is pending completion asynchronously? */
else if (GetLastError() == ERROR_IO_PENDING)
ret= wait_overlapped_result(vio, vio->write_timeout);
enable_iocp_notification(&vio->overlapped);
DBUG_RETURN(ret);
}
my_bool vio_is_connected_pipe(Vio *vio)
{
if (PeekNamedPipe(vio->hPipe, NULL, 0, NULL, NULL, NULL))
return TRUE;
else
return (GetLastError() != ERROR_BROKEN_PIPE);
}
int vio_close_pipe(Vio *vio)
{
BOOL ret;
DBUG_ENTER("vio_close_pipe");
CancelIo(vio->hPipe);
CloseHandle(vio->overlapped.hEvent);
ret= CloseHandle(vio->hPipe);
vio->type= VIO_CLOSED;
vio->hPipe= NULL;
vio->mysql_socket= MYSQL_INVALID_SOCKET;
DBUG_RETURN(ret);
}
/* return number of bytes readable from pipe.*/
uint vio_pending_pipe(Vio *vio)
{
DWORD bytes;
return PeekNamedPipe(vio->hPipe, NULL, 0, NULL, &bytes, NULL) ? bytes : 0;
}
#endif
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