165 lines
3.6 KiB
C++
165 lines
3.6 KiB
C++
/* fhandler_windows.cc: code to access windows message queues.
|
|
|
|
Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2009, 2011, 2012,
|
|
2013 Red Hat, Inc.
|
|
|
|
Written by Sergey S. Okhapkin (sos@prospect.com.ru).
|
|
Feedback and testing by Andy Piper (andyp@parallax.co.uk).
|
|
|
|
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 "cygerrno.h"
|
|
#include "path.h"
|
|
#include "fhandler.h"
|
|
#include "sigproc.h"
|
|
#include "thread.h"
|
|
|
|
|
|
/*
|
|
The following unix-style calls are supported:
|
|
|
|
open ("/dev/windows", flags, mode=0)
|
|
- create a unix fd for message queue.
|
|
|
|
read (fd, buf, len)
|
|
- return next message from queue. buf must point to MSG
|
|
structure, len must be >= sizeof (MSG). If read is set to
|
|
non-blocking and the queue is empty, read call returns -1
|
|
immediately with errno set to EAGAIN, otherwise it blocks
|
|
untill the message will be received.
|
|
|
|
write (fd, buf, len)
|
|
- send a message pointed by buf. len argument ignored.
|
|
|
|
ioctl (fd, command, *param)
|
|
- control read()/write() behavior.
|
|
ioctl (fd, WINDOWS_POST, NULL): write() will PostMessage();
|
|
ioctl (fd, WINDOWS_SEND, NULL): write() will SendMessage();
|
|
ioctl (fd, WINDOWS_HWND, &hWnd): read() messages for
|
|
hWnd window.
|
|
|
|
select () call marks read fd when any message posted to queue.
|
|
*/
|
|
|
|
fhandler_windows::fhandler_windows ()
|
|
: fhandler_base (), hWnd_ (NULL), method_ (WINDOWS_POST)
|
|
{
|
|
}
|
|
|
|
int
|
|
fhandler_windows::open (int flags, mode_t mode)
|
|
{
|
|
return fhandler_base::open ((flags & ~O_TEXT) | O_BINARY, mode);
|
|
}
|
|
|
|
ssize_t __stdcall
|
|
fhandler_windows::write (const void *buf, size_t)
|
|
{
|
|
MSG *ptr = (MSG *) buf;
|
|
|
|
if (method_ == WINDOWS_POST)
|
|
{
|
|
if (!PostMessageW (ptr->hwnd, ptr->message, ptr->wParam, ptr->lParam))
|
|
{
|
|
__seterrno ();
|
|
return -1;
|
|
}
|
|
}
|
|
else if (!SendNotifyMessageW (ptr->hwnd, ptr->message, ptr->wParam,
|
|
ptr->lParam))
|
|
{
|
|
__seterrno ();
|
|
return -1;
|
|
}
|
|
return sizeof (MSG);
|
|
}
|
|
|
|
void __reg3
|
|
fhandler_windows::read (void *buf, size_t& len)
|
|
{
|
|
MSG *ptr = (MSG *) buf;
|
|
|
|
if (len < sizeof (MSG))
|
|
{
|
|
set_errno (EINVAL);
|
|
len = (size_t) -1;
|
|
return;
|
|
}
|
|
|
|
HANDLE w4[2];
|
|
set_signal_arrived here (w4[0]);
|
|
DWORD cnt = 1;
|
|
if ((w4[1] = pthread::get_cancel_event ()) != NULL)
|
|
++cnt;
|
|
for (;;)
|
|
{
|
|
switch (MsgWaitForMultipleObjectsEx (cnt, w4,
|
|
is_nonblocking () ? 0 : INFINITE,
|
|
QS_ALLINPUT | QS_ALLPOSTMESSAGE,
|
|
MWMO_INPUTAVAILABLE))
|
|
{
|
|
case WAIT_OBJECT_0:
|
|
if (_my_tls.call_signal_handler ())
|
|
continue;
|
|
len = (size_t) -1;
|
|
set_errno (EINTR);
|
|
break;
|
|
case WAIT_OBJECT_0 + 1:
|
|
if (cnt > 1) /* WAIT_OBJECT_0 + 1 is the cancel event object. */
|
|
{
|
|
pthread::static_cancel_self ();
|
|
break;
|
|
}
|
|
/*FALLTHRU*/
|
|
case WAIT_OBJECT_0 + 2:
|
|
if (!PeekMessageW (ptr, hWnd_, 0, 0, PM_REMOVE))
|
|
{
|
|
len = (size_t) -1;
|
|
__seterrno ();
|
|
}
|
|
else if (ptr->message == WM_QUIT)
|
|
len = 0;
|
|
else
|
|
len = sizeof (MSG);
|
|
break;
|
|
case WAIT_TIMEOUT:
|
|
len = (size_t) -1;
|
|
set_errno (EAGAIN);
|
|
break;
|
|
default:
|
|
len = (size_t) -1;
|
|
__seterrno ();
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
int
|
|
fhandler_windows::ioctl (unsigned int cmd, void *val)
|
|
{
|
|
switch (cmd)
|
|
{
|
|
case WINDOWS_POST:
|
|
case WINDOWS_SEND:
|
|
method_ = cmd;
|
|
break;
|
|
case WINDOWS_HWND:
|
|
if (val == NULL)
|
|
{
|
|
set_errno (EINVAL);
|
|
return -1;
|
|
}
|
|
hWnd_ = * ((HWND *) val);
|
|
break;
|
|
default:
|
|
return fhandler_base::ioctl (cmd, val);
|
|
}
|
|
return 0;
|
|
}
|