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tests/server: add hidden window to gracefully handle WM_CLOSE

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Forward Window events as signals to existing signal event handler.
This commit is contained in:
Marc Hoersken 2020-04-12 18:38:12 +02:00
parent 30c8ef7d63
commit ac1e206278
No known key found for this signature in database
GPG Key ID: 61E03CBED7BC859E
1 changed files with 88 additions and 0 deletions
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88
tests/server/util.c
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@ -544,6 +544,12 @@ static SIGHANDLER_T old_sigterm_handler = SIG_ERR;
static SIGHANDLER_T old_sigbreak_handler = SIG_ERR;
#endif
#ifdef WIN32
static DWORD thread_main_id = 0;
static HANDLE thread_main_window = NULL;
static HWND hidden_main_window = NULL;
#endif
/* var which if set indicates that the program should finish execution */
volatile int got_exit_signal = 0;
@ -606,6 +612,78 @@ static BOOL WINAPI ctrl_event_handler(DWORD dwCtrlType)
}
return TRUE;
}
/* Window message handler for Windows applications to add support
* for graceful process termination via taskkill (without /f) which
* sends WM_CLOSE to all Windows of a process (even hidden ones).
*
* Therefore we create and run a hidden Window in a separate thread
* to receive and handle the WM_CLOSE message as SIGTERM signal.
*/
static LRESULT CALLBACK main_window_proc(HWND hwnd, UINT uMsg,
WPARAM wParam, LPARAM lParam)
{
int signum = 0;
if(hwnd == hidden_main_window) {
switch(uMsg) {
#ifdef SIGTERM
case WM_CLOSE: signum = SIGTERM; break;
#endif
case WM_DESTROY: PostQuitMessage(0); break;
}
if(signum) {
logmsg("main_window_proc: %d -> %d", uMsg, signum);
exit_signal_handler(signum);
}
}
return DefWindowProc(hwnd, uMsg, wParam, lParam);
}
/* Window message queue loop for hidden main window, details see above.
*/
static DWORD WINAPI main_window_loop(LPVOID lpParameter)
{
WNDCLASS wc;
BOOL ret;
MSG msg;
ZeroMemory(&wc, sizeof(wc));
wc.lpfnWndProc = (WNDPROC)main_window_proc;
wc.hInstance = (HINSTANCE)lpParameter;
wc.lpszClassName = "MainWClass";
if(!RegisterClass(&wc)) {
perror("RegisterClass failed");
return (DWORD)-1;
}
hidden_main_window = CreateWindowEx(0, "MainWClass", "Recv WM_CLOSE msg",
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
(HWND)NULL, (HMENU)NULL,
wc.hInstance, (LPVOID)NULL);
if(!hidden_main_window) {
perror("CreateWindowEx failed");
return (DWORD)-1;
}
do {
ret = GetMessage(&msg, NULL, 0, 0);
if(ret == -1) {
perror("GetMessage failed");
return (DWORD)-1;
}
else if(ret) {
if(msg.message == WM_APP) {
DestroyWindow(hidden_main_window);
}
else if(msg.hwnd && !TranslateMessage(&msg)) {
DispatchMessage(&msg);
}
}
} while(ret);
hidden_main_window = NULL;
return (DWORD)msg.wParam;
}
#endif
void install_signal_handlers(bool keep_sigalrm)
@ -659,6 +737,12 @@ void install_signal_handlers(bool keep_sigalrm)
#ifdef WIN32
if(!SetConsoleCtrlHandler(ctrl_event_handler, TRUE))
logmsg("cannot install CTRL event handler");
thread_main_window = CreateThread(NULL, 0,
&main_window_loop,
(LPVOID)GetModuleHandle(NULL),
0, &thread_main_id);
if(!thread_main_window || !thread_main_id)
logmsg("cannot start main window loop");
#endif
}
@ -694,5 +778,9 @@ void restore_signal_handlers(bool keep_sigalrm)
#endif
#ifdef WIN32
(void)SetConsoleCtrlHandler(ctrl_event_handler, FALSE);
if(thread_main_window && thread_main_id) {
if(PostThreadMessage(thread_main_id, WM_APP, 0, 0))
(void)WaitForSingleObjectEx(thread_main_window, INFINITE, TRUE);
}
#endif
}