+// structure used to pass parameters from wxKill() to wxEnumFindByPidProc()
+struct wxFindByPidParams
+{
+ wxFindByPidParams() { hwnd = 0; pid = 0; }
+
+ // the HWND used to return the result
+ HWND hwnd;
+
+ // the PID we're looking from
+ DWORD pid;
+
+ DECLARE_NO_COPY_CLASS(wxFindByPidParams)
+};
+
+// wxKill helper: EnumWindows() callback which is used to find the first (top
+// level) window belonging to the given process
+BOOL CALLBACK wxEnumFindByPidProc(HWND hwnd, LPARAM lParam)
+{
+ DWORD pid;
+ (void)::GetWindowThreadProcessId(hwnd, &pid);
+
+ wxFindByPidParams *params = (wxFindByPidParams *)lParam;
+ if ( pid == params->pid )
+ {
+ // remember the window we found
+ params->hwnd = hwnd;
+
+ // return FALSE to stop the enumeration
+ return FALSE;
+ }
+
+ // continue enumeration
+ return TRUE;
+}
+
+int wxKillAllChildren(long pid, wxSignal sig, wxKillError *krc);
+
+int wxKill(long pid, wxSignal sig, wxKillError *krc, int flags)
+{
+ if (flags & wxKILL_CHILDREN)
+ wxKillAllChildren(pid, sig, krc);
+
+ // get the process handle to operate on
+ HANDLE hProcess = ::OpenProcess(SYNCHRONIZE |
+ PROCESS_TERMINATE |
+ PROCESS_QUERY_INFORMATION,
+ FALSE, // not inheritable
+ (DWORD)pid);
+ if ( hProcess == NULL )
+ {
+ if ( krc )
+ {
+ if ( ::GetLastError() == ERROR_ACCESS_DENIED )
+ {
+ *krc = wxKILL_ACCESS_DENIED;
+ }
+ else
+ {
+ *krc = wxKILL_NO_PROCESS;
+ }
+ }
+
+ return -1;
+ }
+
+ bool ok = true;
+ switch ( sig )
+ {
+ case wxSIGKILL:
+ // kill the process forcefully returning -1 as error code
+ if ( !::TerminateProcess(hProcess, (UINT)-1) )
+ {
+ wxLogSysError(_("Failed to kill process %d"), pid);
+
+ if ( krc )
+ {
+ // this is not supposed to happen if we could open the
+ // process
+ *krc = wxKILL_ERROR;
+ }
+
+ ok = false;
+ }
+ break;
+
+ case wxSIGNONE:
+ // do nothing, we just want to test for process existence
+ break;
+
+ default:
+ // any other signal means "terminate"
+ {
+ wxFindByPidParams params;
+ params.pid = (DWORD)pid;
+
+ // EnumWindows() has nice semantics: it returns 0 if it found
+ // something or if an error occured and non zero if it
+ // enumerated all the window
+ if ( !::EnumWindows(wxEnumFindByPidProc, (LPARAM)¶ms) )
+ {
+ // did we find any window?
+ if ( params.hwnd )
+ {
+ // tell the app to close
+ //
+ // NB: this is the harshest way, the app won't have
+ // opportunity to save any files, for example, but
+ // this is probably what we want here. If not we
+ // can also use SendMesageTimeout(WM_CLOSE)
+ if ( !::PostMessage(params.hwnd, WM_QUIT, 0, 0) )
+ {
+ wxLogLastError(_T("PostMessage(WM_QUIT)"));
+ }
+ }
+ else // it was an error then
+ {
+ wxLogLastError(_T("EnumWindows"));
+
+ ok = false;
+ }
+ }
+ else // no windows for this PID
+ {
+ if ( krc )
+ {
+ *krc = wxKILL_ERROR;
+ }
+
+ ok = false;
+ }
+ }
+ }
+
+ // the return code
+ DWORD rc;
+
+ if ( ok )
+ {
+ // as we wait for a short time, we can use just WaitForSingleObject()
+ // and not MsgWaitForMultipleObjects()
+ switch ( ::WaitForSingleObject(hProcess, 500 /* msec */) )
+ {
+ case WAIT_OBJECT_0:
+ // process terminated
+ if ( !::GetExitCodeProcess(hProcess, &rc) )
+ {
+ wxLogLastError(_T("GetExitCodeProcess"));
+ }
+ break;
+
+ default:
+ wxFAIL_MSG( _T("unexpected WaitForSingleObject() return") );
+ // fall through
+
+ case WAIT_FAILED:
+ wxLogLastError(_T("WaitForSingleObject"));
+ // fall through
+
+ case WAIT_TIMEOUT:
+ if ( krc )
+ {
+ *krc = wxKILL_ERROR;
+ }
+
+ rc = STILL_ACTIVE;
+ break;
+ }
+ }
+ else // !ok
+ {
+ // just to suppress the warnings about uninitialized variable
+ rc = 0;
+ }
+
+ ::CloseHandle(hProcess);
+
+ // the return code is the same as from Unix kill(): 0 if killed
+ // successfully or -1 on error
+ //
+ // be careful to interpret rc correctly: for wxSIGNONE we return success if
+ // the process exists, for all the other sig values -- if it doesn't
+ if ( ok &&
+ ((sig == wxSIGNONE) == (rc == STILL_ACTIVE)) )
+ {
+ if ( krc )
+ {
+ *krc = wxKILL_OK;
+ }
+
+ return 0;
+ }
+
+ // error
+ return -1;
+}
+
+HANDLE (WINAPI *lpfCreateToolhelp32Snapshot)(DWORD,DWORD) ;
+BOOL (WINAPI *lpfProcess32First)(HANDLE,LPPROCESSENTRY32) ;
+BOOL (WINAPI *lpfProcess32Next)(HANDLE,LPPROCESSENTRY32) ;
+
+static void InitToolHelp32()
+{
+ static bool s_initToolHelpDone = false;
+
+ if (s_initToolHelpDone)
+ return;
+
+ s_initToolHelpDone = true;
+
+ lpfCreateToolhelp32Snapshot = NULL;
+ lpfProcess32First = NULL;
+ lpfProcess32Next = NULL;
+
+ HINSTANCE hInstLib = LoadLibrary( wxT("Kernel32.DLL") ) ;
+ if( hInstLib == NULL )
+ return ;
+
+ // Get procedure addresses.
+ // We are linking to these functions of Kernel32
+ // explicitly, because otherwise a module using
+ // this code would fail to load under Windows NT,
+ // which does not have the Toolhelp32
+ // functions in the Kernel 32.
+ lpfCreateToolhelp32Snapshot=
+ (HANDLE(WINAPI *)(DWORD,DWORD))
+ GetProcAddress( hInstLib,
+#ifdef __WXWINCE__
+ wxT("CreateToolhelp32Snapshot")
+#else
+ "CreateToolhelp32Snapshot"
+#endif
+ ) ;
+
+ lpfProcess32First=
+ (BOOL(WINAPI *)(HANDLE,LPPROCESSENTRY32))
+ GetProcAddress( hInstLib,
+#ifdef __WXWINCE__
+ wxT("Process32First")
+#else
+ "Process32First"
+#endif
+ ) ;
+
+ lpfProcess32Next=
+ (BOOL(WINAPI *)(HANDLE,LPPROCESSENTRY32))
+ GetProcAddress( hInstLib,
+#ifdef __WXWINCE__
+ wxT("Process32Next")
+#else
+ "Process32Next"
+#endif
+ ) ;
+
+ FreeLibrary( hInstLib ) ;
+}
+
+// By John Skiff
+int wxKillAllChildren(long pid, wxSignal sig, wxKillError *krc)
projects / wxWidgets.git / blobdiff