db3137ccb5
CTRL_LOGOFF_EVENT to processes running in invisible Windows Stations. * window.cc (has_visible_window_station): New function. * winsup.h: Add declaration for has_visible_window_station.
270 lines
5.9 KiB
C++
270 lines
5.9 KiB
C++
/* window.cc: hidden windows for signals/itimer support
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Copyright 1997, 1998, 2000, 2001, 2002, 2003 Red Hat, Inc.
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Written by Sergey Okhapkin <sos@prospect.com.ru>
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#include "winsup.h"
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#include <sys/time.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <limits.h>
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#include <wingdi.h>
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#include <winuser.h>
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#define USE_SYS_TYPES_FD_SET
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#include <winsock2.h>
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#include <unistd.h>
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#include "cygerrno.h"
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#include "perprocess.h"
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#include "security.h"
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#include "cygthread.h"
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static NO_COPY UINT timer_active = 0;
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static NO_COPY struct itimerval itv;
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static NO_COPY DWORD start_time;
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static NO_COPY HWND ourhwnd = NULL;
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static LRESULT CALLBACK
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WndProc (HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
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{
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#ifndef NOSTRACE
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strace.wm (uMsg, wParam, lParam);
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#endif
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switch (uMsg)
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{
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case WM_PAINT:
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return 0;
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case WM_DESTROY:
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PostQuitMessage (0);
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return 0;
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case WM_TIMER:
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if (wParam == timer_active)
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{
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UINT elapse = itv.it_interval.tv_sec * 1000 +
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itv.it_interval.tv_usec / 1000;
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KillTimer (hwnd, timer_active);
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if (!elapse)
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{
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timer_active = 0;
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}
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else
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{
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timer_active = SetTimer (hwnd, 1, elapse, NULL);
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start_time = GetTickCount ();
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itv.it_value = itv.it_interval;
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}
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raise (SIGALRM);
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}
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return 0;
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case WM_ASYNCIO:
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if (WSAGETSELECTEVENT (lParam) == FD_OOB)
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raise (SIGURG);
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else
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raise (SIGIO);
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return 0;
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default:
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return DefWindowProc (hwnd, uMsg, wParam, lParam);
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}
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}
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static HANDLE window_started;
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static DWORD WINAPI
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Winmain (VOID *)
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{
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MSG msg;
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WNDCLASS wc;
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static NO_COPY char classname[] = "CygwinWndClass";
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/* Register the window class for the main window. */
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wc.style = 0;
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wc.lpfnWndProc = (WNDPROC) WndProc;
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wc.cbClsExtra = 0;
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wc.cbWndExtra = 0;
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wc.hInstance = user_data->hmodule;
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wc.hIcon = NULL;
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wc.hCursor = NULL;
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wc.hbrBackground = NULL;
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wc.lpszMenuName = NULL;
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wc.lpszClassName = classname;
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if (!RegisterClass (&wc))
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{
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system_printf ("Cannot register window class");
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return FALSE;
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}
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/* Create hidden window. */
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ourhwnd = CreateWindow (classname, classname, WS_POPUP, CW_USEDEFAULT,
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CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
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(HWND) NULL, (HMENU) NULL, user_data->hmodule,
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(LPVOID) NULL);
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SetEvent (window_started);
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if (!ourhwnd)
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{
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system_printf ("Cannot create window");
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return FALSE;
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}
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/* Start the message loop. */
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while (GetMessage (&msg, ourhwnd, 0, 0) == TRUE)
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DispatchMessage (&msg);
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ExitThread (0);
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}
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HWND __stdcall
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gethwnd ()
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{
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if (ourhwnd != NULL)
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return ourhwnd;
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cygthread *h;
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window_started = CreateEvent (&sec_none_nih, TRUE, FALSE, NULL);
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h = new cygthread (Winmain, NULL, "win");
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h->SetThreadPriority (THREAD_PRIORITY_HIGHEST);
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WaitForSingleObject (window_started, INFINITE);
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CloseHandle (window_started);
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h->zap_h ();
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return ourhwnd;
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}
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extern "C" int
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setitimer (int which, const struct itimerval *value, struct itimerval *oldvalue)
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{
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UINT elapse;
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if (which != ITIMER_REAL)
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{
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set_errno (ENOSYS);
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return -1;
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}
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/* Check if we will wrap */
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if (itv.it_value.tv_sec >= (long) (UINT_MAX / 1000))
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{
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set_errno (EINVAL);
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return -1;
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}
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if (timer_active)
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{
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KillTimer (gethwnd (), timer_active);
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timer_active = 0;
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}
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if (oldvalue)
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*oldvalue = itv;
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if (value == NULL)
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{
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set_errno (EFAULT);
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return -1;
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}
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itv = *value;
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elapse = itv.it_value.tv_sec * 1000 + itv.it_value.tv_usec / 1000;
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if (elapse == 0)
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if (itv.it_value.tv_usec)
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elapse = 1;
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else
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return 0;
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if (!(timer_active = SetTimer (gethwnd (), 1, elapse, NULL)))
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{
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__seterrno ();
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return -1;
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}
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start_time = GetTickCount ();
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return 0;
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}
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extern "C" int
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getitimer (int which, struct itimerval *value)
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{
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UINT elapse, val;
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if (which != ITIMER_REAL)
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{
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set_errno (EINVAL);
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return -1;
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}
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if (value == NULL)
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{
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set_errno (EFAULT);
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return -1;
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}
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*value = itv;
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if (!timer_active)
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{
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value->it_value.tv_sec = 0;
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value->it_value.tv_usec = 0;
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return 0;
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}
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elapse = GetTickCount () - start_time;
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val = itv.it_value.tv_sec * 1000 + itv.it_value.tv_usec / 1000;
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val -= elapse;
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value->it_value.tv_sec = val / 1000;
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value->it_value.tv_usec = val % 1000;
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return 0;
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}
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extern "C" unsigned int
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alarm (unsigned int seconds)
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{
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int ret;
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struct itimerval newt, oldt;
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newt.it_value.tv_sec = seconds;
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newt.it_value.tv_usec = 0;
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newt.it_interval.tv_sec = 0;
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newt.it_interval.tv_usec = 0;
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setitimer (ITIMER_REAL, &newt, &oldt);
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ret = oldt.it_value.tv_sec;
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if (ret == 0 && oldt.it_value.tv_usec)
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ret = 1;
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return ret;
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}
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extern "C" useconds_t
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ualarm (useconds_t value, useconds_t interval)
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{
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struct itimerval timer, otimer;
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timer.it_value.tv_sec = 0;
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timer.it_value.tv_usec = value;
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timer.it_interval.tv_sec = 0;
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timer.it_interval.tv_usec = interval;
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if (setitimer (ITIMER_REAL, &timer, &otimer) < 0)
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return (u_int)-1;
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return (otimer.it_value.tv_sec * 1000000) + otimer.it_value.tv_usec;
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}
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bool
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has_visible_window_station (void)
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{
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HWINSTA station_hdl;
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USEROBJECTFLAGS uof;
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DWORD len;
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/* Check if the process is associated with a visible window station.
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These are processes running on the local desktop as well as processes
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running in terminal server sessions.
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Processes running in a service session not explicitely associated
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with the desktop (using the "Allow service to interact with desktop"
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property) are running in an invisible window station. */
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if ((station_hdl = GetProcessWindowStation ())
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&& GetUserObjectInformationA (station_hdl, UOI_FLAGS, &uof,
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sizeof uof, &len)
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&& (uof.dwFlags & WSF_VISIBLE))
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return true;
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return false;
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}
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