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/* DreamChess
**
** DreamChess is the legal property of its developers, whose names are too
** numerous to list here. Please refer to the COPYRIGHT file distributed
** with this source distribution.
**
** 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, either version 3 of the License, or
** (at your option) any later version.
**
** 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, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /* HAVE_CONFIG_H */
#ifdef COMM_PIPE_WIN32
#include <windows.h>
#include <stdio.h>
#include "pipe_win32.h"
#include "debug.h"
#include "dreamchess.h"
static int init_ok = 0;
static HANDLE hProcess;
int comm_init(char *engine)
{
HANDLE to_child_rd, to_child_wr, to_child_wr_dup, from_child_rd,
from_child_wr, from_child_rd_dup, h_stdout;
SECURITY_ATTRIBUTES sa_attr;
PROCESS_INFORMATION proc_info;
STARTUPINFO start_info;
/* Make pipe handles inherited. */
sa_attr.nLength = sizeof(SECURITY_ATTRIBUTES);
sa_attr.bInheritHandle = TRUE;
sa_attr.lpSecurityDescriptor = NULL;
/* Get the STDOUT handle. */
h_stdout = GetStdHandle(STD_OUTPUT_HANDLE);
/* Create a pipe for input from child. */
if (!CreatePipe(&from_child_rd, &from_child_wr, &sa_attr, 0))
{
DBG_ERROR("failed to create stdout pipe");
exit(1);
}
/* Make a non-inheritable copy of the read handle and close the original
** one.
*/
if (!DuplicateHandle(GetCurrentProcess(), from_child_rd,
GetCurrentProcess(), &from_child_rd_dup, 0, FALSE,
DUPLICATE_SAME_ACCESS))
{
DBG_ERROR("failed to duplicate read handle");
exit(1);
}
CloseHandle(from_child_rd);
/* Create a pipe for output to child. */
if (! CreatePipe(&to_child_rd, &to_child_wr, &sa_attr, 0))
{
DBG_ERROR("failed to create stdin pipe");
exit(1);
}
/* Make a non-inheritable copy of the write handle and close the original
** one.
*/
if (!DuplicateHandle(GetCurrentProcess(), to_child_wr,
GetCurrentProcess(), &to_child_wr_dup, 0, FALSE,
DUPLICATE_SAME_ACCESS))
{
DBG_ERROR("failed to duplicate write handle");
exit(1);
}
CloseHandle(to_child_wr);
/* Create child process. */
ZeroMemory(&proc_info, sizeof(PROCESS_INFORMATION));
ZeroMemory(&start_info, sizeof(STARTUPINFO));
start_info.cb = sizeof(STARTUPINFO);
start_info.hStdError = from_child_wr;
start_info.hStdOutput = from_child_wr;
start_info.hStdInput = to_child_rd;
start_info.dwFlags |= STARTF_USESTDHANDLES;
if (!CreateProcess(NULL, engine, NULL, NULL, TRUE, DETACHED_PROCESS,
NULL, NULL, &start_info, &proc_info))
{
DBG_ERROR("failed to create child process");
init_ok = 0;
return 1;
}
hProcess = proc_info.hProcess;
/* Close unneeded handle. */
CloseHandle(proc_info.hThread);
pipe_win32_init(from_child_rd_dup, to_child_wr_dup);
init_ok = 1;
return 0;
}
void comm_exit()
{
if (init_ok) {
DBG_LOG("waiting for engine to exit");
if (WaitForSingleObject(hProcess, INFINITE) != WAIT_FAILED) {
DBG_LOG("engine exitted succesfully");
CloseHandle(hProcess);
} else {
DBG_ERROR("error while waiting for engine to quit");
exit(1);
}
pipe_win32_exit();
}
}
void comm_send_str(char *str)
{
if (init_ok)
pipe_win32_send(str);
}
char *comm_poll()
{
if (init_ok) {
DWORD exit;
int error;
GetExitCodeProcess(hProcess, &exit);
if (exit == STILL_ACTIVE)
{
char *retval = pipe_win32_poll(&error);
if (!error)
return retval;
} else {
DBG_ERROR("engine process has terminated");
}
pipe_win32_exit();
init_ok = 0;
game_set_engine_error(1);
}
return NULL;
}
#endif /* COMM_PIPE_WIN32 */
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