3 int get_process_creation_time(HANDLE process_handle, FILETIME *ft) {
4 FILETIME creation_time, exit_time, kernel_time, user_time;
6 if (! GetProcessTimes(process_handle, &creation_time, &exit_time, &kernel_time, &user_time)) {
7 log_event(EVENTLOG_ERROR_TYPE, NSSM_EVENT_GETPROCESSTIMES_FAILED, error_string(GetLastError()), 0);
11 memmove(ft, &creation_time, sizeof(creation_time));
16 int get_process_exit_time(HANDLE process_handle, FILETIME *ft) {
17 FILETIME creation_time, exit_time, kernel_time, user_time;
19 if (! GetProcessTimes(process_handle, &creation_time, &exit_time, &kernel_time, &user_time)) {
20 log_event(EVENTLOG_ERROR_TYPE, NSSM_EVENT_GETPROCESSTIMES_FAILED, error_string(GetLastError()), 0);
24 memmove(ft, &exit_time, sizeof(exit_time));
29 int check_parent(char *service_name, PROCESSENTRY32 *pe, unsigned long ppid, FILETIME *pft, FILETIME *exit_time) {
30 /* Check parent process ID matches. */
31 if (pe->th32ParentProcessID != ppid) return 1;
34 Process IDs can be reused so do a sanity check by making sure the child
35 has been running for less time than the parent.
36 Though unlikely, it's possible that the parent exited and its process ID
37 was already reused, so we'll also compare against its exit time.
39 HANDLE process_handle = OpenProcess(PROCESS_QUERY_INFORMATION, false, pe->th32ProcessID);
40 if (! process_handle) {
42 _snprintf(pid_string, sizeof(pid_string), "%d", pe->th32ProcessID);
43 log_event(EVENTLOG_ERROR_TYPE, NSSM_EVENT_OPENPROCESS_FAILED, pid_string, service_name, error_string(GetLastError()), 0);
48 if (get_process_creation_time(process_handle, &ft)) {
49 CloseHandle(process_handle);
53 CloseHandle(process_handle);
55 /* Verify that the parent's creation time is not later. */
56 if (CompareFileTime(pft, &ft) > 0) return 4;
58 /* Verify that the parent's exit time is not earlier. */
59 if (CompareFileTime(exit_time, &ft) < 0) return 5;
64 /* Send some window messages and hope the window respects one or more. */
65 int CALLBACK kill_window(HWND window, LPARAM arg) {
66 kill_t *k = (kill_t *) arg;
69 if (! GetWindowThreadProcessId(window, &pid)) return 1;
70 if (pid != k->pid) return 1;
72 /* First try sending WM_CLOSE to request that the window close. */
73 k->signalled |= PostMessage(window, WM_CLOSE, k->exitcode, 0);
76 Then tell the window that the user is logging off and it should exit
77 without worrying about saving any data.
79 k->signalled |= PostMessage(window, WM_ENDSESSION, 1, ENDSESSION_CLOSEAPP | ENDSESSION_CRITICAL | ENDSESSION_LOGOFF);
85 Try to post a message to the message queues of threads associated with the
86 given process ID. Not all threads have message queues so there's no
87 guarantee of success, and we don't want to be left waiting for unsignalled
88 processes so this function returns only true if at least one thread was
91 int kill_threads(char *service_name, kill_t *k) {
94 /* Get a snapshot of all threads in the system. */
95 HANDLE snapshot = CreateToolhelp32Snapshot(TH32CS_SNAPTHREAD, 0);
97 log_event(EVENTLOG_ERROR_TYPE, NSSM_EVENT_CREATETOOLHELP32SNAPSHOT_THREAD_FAILED, service_name, error_string(GetLastError()), 0);
102 ZeroMemory(&te, sizeof(te));
103 te.dwSize = sizeof(te);
105 if (! Thread32First(snapshot, &te)) {
106 log_event(EVENTLOG_ERROR_TYPE, NSSM_EVENT_THREAD_ENUMERATE_FAILED, service_name, error_string(GetLastError()), 0);
107 CloseHandle(snapshot);
111 /* This thread belongs to the doomed process so signal it. */
112 if (te.th32OwnerProcessID == k->pid) {
113 ret |= PostThreadMessage(te.th32ThreadID, WM_QUIT, k->exitcode, 0);
117 /* Try to get the next thread. */
118 if (! Thread32Next(snapshot, &te)) {
119 unsigned long error = GetLastError();
120 if (error == ERROR_NO_MORE_FILES) break;
121 log_event(EVENTLOG_ERROR_TYPE, NSSM_EVENT_THREAD_ENUMERATE_FAILED, service_name, error_string(GetLastError()), 0);
122 CloseHandle(snapshot);
126 if (te.th32OwnerProcessID == k->pid) {
127 ret |= PostThreadMessage(te.th32ThreadID, WM_QUIT, k->exitcode, 0);
131 CloseHandle(snapshot);
136 /* Give the process a chance to die gracefully. */
137 int kill_process(char *service_name, HANDLE process_handle, unsigned long pid, unsigned long exitcode) {
138 /* Shouldn't happen. */
140 if (! process_handle) return 1;
143 if (GetExitCodeProcess(process_handle, &ret)) {
144 if (ret != STILL_ACTIVE) return 1;
147 kill_t k = { pid, exitcode, 0 };
149 /* Try to send a Control-C event to the console. */
150 if (! kill_console(service_name, process_handle, pid)) return 1;
153 Try to post messages to the windows belonging to the given process ID.
154 If the process is a console application it won't have any windows so there's
155 no guarantee of success.
157 EnumWindows((WNDENUMPROC) kill_window, (LPARAM) &k);
159 if (! WaitForSingleObject(process_handle, NSSM_KILL_WINDOW_GRACE_PERIOD)) return 1;
163 Try to post messages to any thread message queues associated with the
164 process. Console applications might have them (but probably won't) so
165 there's still no guarantee of success.
167 if (kill_threads(service_name, &k)) {
168 if (! WaitForSingleObject(process_handle, NSSM_KILL_THREADS_GRACE_PERIOD)) return 1;
171 /* We tried being nice. Time for extreme prejudice. */
172 return TerminateProcess(process_handle, exitcode);
175 /* Simulate a Control-C event to our console (shared with the app). */
176 int kill_console(char *service_name, HANDLE process_handle, unsigned long pid) {
179 /* Try to attach to the process's console. */
180 if (! AttachConsole(pid)) {
181 ret = GetLastError();
184 case ERROR_INVALID_HANDLE:
185 /* The app doesn't have a console. */
188 case ERROR_GEN_FAILURE:
189 /* The app already exited. */
192 case ERROR_ACCESS_DENIED:
194 /* We already have a console. */
195 log_event(EVENTLOG_ERROR_TYPE, NSSM_EVENT_ATTACHCONSOLE_FAILED, service_name, error_string(ret), 0);
200 /* Ignore the event ourselves. */
202 if (! SetConsoleCtrlHandler(0, TRUE)) {
203 log_event(EVENTLOG_ERROR_TYPE, NSSM_EVENT_SETCONSOLECTRLHANDLER_FAILED, service_name, error_string(GetLastError()), 0);
207 /* Sent the event. */
209 if (! GenerateConsoleCtrlEvent(CTRL_C_EVENT, 0)) {
210 log_event(EVENTLOG_ERROR_TYPE, NSSM_EVENT_GENERATECONSOLECTRLEVENT_FAILED, service_name, error_string(GetLastError()), 0);
215 /* Detach from the console. */
216 if (! FreeConsole()) {
217 log_event(EVENTLOG_WARNING_TYPE, NSSM_EVENT_FREECONSOLE_FAILED, service_name, error_string(GetLastError()), 0);
220 /* Wait for process to exit. */
221 if (! WaitForSingleObject(process_handle, NSSM_KILL_CONSOLE_GRACE_PERIOD)) return 6;
226 void kill_process_tree(char *service_name, unsigned long pid, unsigned long exitcode, unsigned long ppid, FILETIME *parent_creation_time, FILETIME *parent_exit_time) {
227 /* Shouldn't happen unless the service failed to start. */
230 char pid_string[16], code[16];
231 _snprintf(pid_string, sizeof(pid_string), "%d", pid);
232 _snprintf(code, sizeof(code), "%d", exitcode);
233 log_event(EVENTLOG_INFORMATION_TYPE, NSSM_EVENT_KILLING, service_name, pid_string, code, 0);
235 /* Get a snapshot of all processes in the system. */
236 HANDLE snapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
238 log_event(EVENTLOG_ERROR_TYPE, NSSM_EVENT_CREATETOOLHELP32SNAPSHOT_PROCESS_FAILED, service_name, error_string(GetLastError()), 0);
243 ZeroMemory(&pe, sizeof(pe));
244 pe.dwSize = sizeof(pe);
246 if (! Process32First(snapshot, &pe)) {
247 log_event(EVENTLOG_ERROR_TYPE, NSSM_EVENT_PROCESS_ENUMERATE_FAILED, service_name, error_string(GetLastError()), 0);
248 CloseHandle(snapshot);
252 /* This is a child of the doomed process so kill it. */
253 if (! check_parent(service_name, &pe, pid, parent_creation_time, parent_exit_time)) kill_process_tree(service_name, pe.th32ProcessID, exitcode, ppid, parent_creation_time, parent_exit_time);
256 /* Try to get the next process. */
257 if (! Process32Next(snapshot, &pe)) {
258 unsigned long ret = GetLastError();
259 if (ret == ERROR_NO_MORE_FILES) break;
260 log_event(EVENTLOG_ERROR_TYPE, NSSM_EVENT_PROCESS_ENUMERATE_FAILED, service_name, error_string(GetLastError()), 0);
261 CloseHandle(snapshot);
265 if (! check_parent(service_name, &pe, pid, parent_creation_time, parent_exit_time)) kill_process_tree(service_name, pe.th32ProcessID, exitcode, ppid, parent_creation_time, parent_exit_time);
268 CloseHandle(snapshot);
270 /* We will need a process handle in order to call TerminateProcess() later. */
271 HANDLE process_handle = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION | PROCESS_VM_READ | PROCESS_TERMINATE, false, pid);
272 if (! process_handle) {
273 log_event(EVENTLOG_ERROR_TYPE, NSSM_EVENT_OPENPROCESS_FAILED, pid_string, service_name, error_string(GetLastError()), 0);
277 char ppid_string[16];
278 _snprintf(ppid_string, sizeof(ppid_string), "%d", ppid);
279 log_event(EVENTLOG_INFORMATION_TYPE, NSSM_EVENT_KILL_PROCESS_TREE, pid_string, ppid_string, service_name, 0);
280 if (! kill_process(service_name, process_handle, pid, exitcode)) {
281 /* Maybe it already died. */
283 if (! GetExitCodeProcess(process_handle, &ret) || ret == STILL_ACTIVE) log_event(EVENTLOG_ERROR_TYPE, NSSM_EVENT_TERMINATEPROCESS_FAILED, pid_string, service_name, error_string(GetLastError()), 0);
286 CloseHandle(process_handle);