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/* Copyright (c) 2011, 2025, Oracle and/or its affiliates.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is designed to work with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have either included with
the program or referenced in the documentation.
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, version 2.0, 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 02110-1301 USA */
#include "vio_priv.h"
#include "my_dbug.h"
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_TRACE;
/* 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);
return ret;
}
size_t vio_write_pipe(Vio *vio, const uchar *buf, size_t count) {
DWORD transferred;
size_t ret = (size_t)-1;
DBUG_TRACE;
/* 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);
return ret;
}
bool vio_is_connected_pipe(Vio *vio) {
if (PeekNamedPipe(vio->hPipe, NULL, 0, NULL, NULL, NULL)) return true;
return (GetLastError() != ERROR_BROKEN_PIPE);
}
int vio_shutdown_pipe(Vio *vio) {
BOOL ret = FALSE;
DBUG_TRACE;
if (vio->inactive == false) {
CancelIo(vio->hPipe);
CloseHandle(vio->overlapped.hEvent);
FlushFileBuffers(vio->hPipe);
DisconnectNamedPipe(vio->hPipe);
ret = CloseHandle(vio->hPipe);
}
vio->inactive = true;
vio->hPipe = NULL;
vio->mysql_socket = MYSQL_INVALID_SOCKET;
return ret;
}
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