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 };
150 Try to post messages to the windows belonging to the given process ID.
151 If the process is a console application it won't have any windows so there's
152 no guarantee of success.
154 EnumWindows((WNDENUMPROC) kill_window, (LPARAM) &k);
156 if (! WaitForSingleObject(process_handle, NSSM_KILL_WINDOW_GRACE_PERIOD)) return 1;
160 Try to post messages to any thread message queues associated with the
161 process. Console applications might have them (but probably won't) so
162 there's still no guarantee of success.
164 if (kill_threads(service_name, &k)) {
165 if (! WaitForSingleObject(process_handle, NSSM_KILL_THREADS_GRACE_PERIOD)) return 1;
168 /* We tried being nice. Time for extreme prejudice. */
169 return TerminateProcess(process_handle, exitcode);
172 void kill_process_tree(char *service_name, unsigned long pid, unsigned long exitcode, unsigned long ppid, FILETIME *parent_creation_time, FILETIME *parent_exit_time) {
173 /* Shouldn't happen unless the service failed to start. */
176 char pid_string[16], code[16];
177 _snprintf(pid_string, sizeof(pid_string), "%d", pid);
178 _snprintf(code, sizeof(code), "%d", exitcode);
179 log_event(EVENTLOG_INFORMATION_TYPE, NSSM_EVENT_KILLING, service_name, pid_string, code, 0);
181 /* Get a snapshot of all processes in the system. */
182 HANDLE snapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
184 log_event(EVENTLOG_ERROR_TYPE, NSSM_EVENT_CREATETOOLHELP32SNAPSHOT_PROCESS_FAILED, service_name, error_string(GetLastError()), 0);
189 ZeroMemory(&pe, sizeof(pe));
190 pe.dwSize = sizeof(pe);
192 if (! Process32First(snapshot, &pe)) {
193 log_event(EVENTLOG_ERROR_TYPE, NSSM_EVENT_PROCESS_ENUMERATE_FAILED, service_name, error_string(GetLastError()), 0);
194 CloseHandle(snapshot);
198 /* This is a child of the doomed process so kill it. */
199 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);
202 /* Try to get the next process. */
203 if (! Process32Next(snapshot, &pe)) {
204 unsigned long ret = GetLastError();
205 if (ret == ERROR_NO_MORE_FILES) break;
206 log_event(EVENTLOG_ERROR_TYPE, NSSM_EVENT_PROCESS_ENUMERATE_FAILED, service_name, error_string(GetLastError()), 0);
207 CloseHandle(snapshot);
211 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);
214 CloseHandle(snapshot);
216 /* We will need a process handle in order to call TerminateProcess() later. */
217 HANDLE process_handle = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION | PROCESS_VM_READ | PROCESS_TERMINATE, false, pid);
218 if (! process_handle) {
219 log_event(EVENTLOG_ERROR_TYPE, NSSM_EVENT_OPENPROCESS_FAILED, pid_string, service_name, error_string(GetLastError()), 0);
223 char ppid_string[16];
224 _snprintf(ppid_string, sizeof(ppid_string), "%d", ppid);
225 log_event(EVENTLOG_INFORMATION_TYPE, NSSM_EVENT_KILL_PROCESS_TREE, pid_string, ppid_string, service_name, 0);
226 if (! kill_process(service_name, process_handle, pid, exitcode)) {
227 /* Maybe it already died. */
229 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);
232 CloseHandle(process_handle);