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/* window.cc: hidden windows for signals/itimer support
Copyright 1997, 1998, 2000, 2001, 2002 Red Hat, Inc.
Written by Sergey Okhapkin <sos@prospect.com.ru>
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
#include <sys/time.h>
#include <stdlib.h>
#include <errno.h>
#include <signal.h>
#include <limits.h>
#include <wingdi.h>
#include <winuser.h>
#define USE_SYS_TYPES_FD_SET
#include <winsock2.h>
#include <unistd.h>
#include "cygerrno.h"
#include "perprocess.h"
#include "security.h"
#include "cygthread.h"
static NO_COPY UINT timer_active = 0;
static NO_COPY struct itimerval itv;
static NO_COPY DWORD start_time;
static NO_COPY HWND ourhwnd = NULL;
static LRESULT CALLBACK
WndProc (HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
#ifndef NOSTRACE
strace.wm (uMsg, wParam, lParam);
#endif
switch (uMsg)
{
case WM_PAINT:
return 0;
case WM_DESTROY:
PostQuitMessage (0);
return 0;
case WM_TIMER:
if (wParam == timer_active)
{
UINT elapse = itv.it_interval.tv_sec * 1000 +
itv.it_interval.tv_usec / 1000;
KillTimer (hwnd, timer_active);
if (!elapse)
{
timer_active = 0;
}
else
{
timer_active = SetTimer (hwnd, 1, elapse, NULL);
start_time = GetTickCount ();
itv.it_value = itv.it_interval;
}
raise (SIGALRM);
}
return 0;
case WM_ASYNCIO:
if (WSAGETSELECTEVENT (lParam) == FD_OOB)
raise (SIGURG);
else
raise (SIGIO);
return 0;
default:
return DefWindowProc (hwnd, uMsg, wParam, lParam);
}
}
static HANDLE window_started;
static DWORD WINAPI
Winmain (VOID *)
{
MSG msg;
WNDCLASS wc;
static NO_COPY char classname[] = "CygwinWndClass";
/* Register the window class for the main window. */
wc.style = 0;
wc.lpfnWndProc = (WNDPROC) WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = user_data->hmodule;
wc.hIcon = NULL;
wc.hCursor = NULL;
wc.hbrBackground = NULL;
wc.lpszMenuName = NULL;
wc.lpszClassName = classname;
if (!RegisterClass (&wc))
{
system_printf ("Cannot register window class");
return FALSE;
}
/* Create hidden window. */
ourhwnd = CreateWindow (classname, classname, WS_POPUP, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
(HWND) NULL, (HMENU) NULL, user_data->hmodule,
(LPVOID) NULL);
SetEvent (window_started);
if (!ourhwnd)
{
system_printf ("Cannot create window");
return FALSE;
}
/* Start the message loop. */
while (GetMessage (&msg, ourhwnd, 0, 0) == TRUE)
DispatchMessage (&msg);
ExitThread (0);
}
HWND __stdcall
gethwnd ()
{
if (ourhwnd != NULL)
return ourhwnd;
cygthread *h;
window_started = CreateEvent (&sec_none_nih, TRUE, FALSE, NULL);
h = new cygthread (Winmain, NULL, "win");
h->SetThreadPriority (THREAD_PRIORITY_HIGHEST);
WaitForSingleObject (window_started, INFINITE);
CloseHandle (window_started);
h->zap_h ();
return ourhwnd;
}
extern "C" int
setitimer (int which, const struct itimerval *value, struct itimerval *oldvalue)
{
UINT elapse;
if (which != ITIMER_REAL)
{
set_errno (EINVAL);
return -1;
}
/* Check if we will wrap */
if (itv.it_value.tv_sec >= (long) (UINT_MAX / 1000))
{
set_errno (EINVAL);
return -1;
}
if (timer_active)
{
KillTimer (gethwnd (), timer_active);
timer_active = 0;
}
if (oldvalue)
*oldvalue = itv;
if (value == NULL)
{
set_errno (EFAULT);
return -1;
}
itv = *value;
elapse = itv.it_value.tv_sec * 1000 + itv.it_value.tv_usec / 1000;
if (elapse == 0)
if (itv.it_value.tv_usec)
elapse = 1;
else
return 0;
if (!(timer_active = SetTimer (gethwnd (), 1, elapse, NULL)))
{
__seterrno ();
return -1;
}
start_time = GetTickCount ();
return 0;
}
extern "C" int
getitimer (int which, struct itimerval *value)
{
UINT elapse, val;
if (which != ITIMER_REAL)
{
set_errno (EINVAL);
return -1;
}
if (value == NULL)
{
set_errno (EFAULT);
return -1;
}
*value = itv;
if (!timer_active)
{
value->it_value.tv_sec = 0;
value->it_value.tv_usec = 0;
return 0;
}
elapse = GetTickCount () - start_time;
val = itv.it_value.tv_sec * 1000 + itv.it_value.tv_usec / 1000;
val -= elapse;
value->it_value.tv_sec = val / 1000;
value->it_value.tv_usec = val % 1000;
return 0;
}
extern "C" unsigned int
alarm (unsigned int seconds)
{
int ret;
struct itimerval newt, oldt;
newt.it_value.tv_sec = seconds;
newt.it_value.tv_usec = 0;
newt.it_interval.tv_sec = 0;
newt.it_interval.tv_usec = 0;
setitimer (ITIMER_REAL, &newt, &oldt);
ret = oldt.it_value.tv_sec;
if (ret == 0 && oldt.it_value.tv_usec)
ret = 1;
return ret;
}
extern "C" useconds_t
ualarm (useconds_t value, useconds_t interval)
{
struct itimerval timer, otimer;
timer.it_value.tv_sec = 0;
timer.it_value.tv_usec = value;
timer.it_interval.tv_sec = 0;
timer.it_interval.tv_usec = interval;
if (setitimer (ITIMER_REAL, &timer, &otimer) < 0)
return (u_int)-1;
return (otimer.it_value.tv_sec * 1000000) + otimer.it_value.tv_usec;
}
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