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/* fhandler_windows.cc: code to access windows message queues.
Copyright 1998, 1999, 2000, 2001 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 <errno.h>
#include <wingdi.h>
#include <winuser.h>
#include "cygerrno.h"
#include "security.h"
#include "fhandler.h"
/*
The following unix-style calls are supported:
open ("/dev/windows", flags, mode=0)
- create a unix fd for message queue.
O_NONBLOCK flag controls the read() call behavior.
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 (const char *name) :
fhandler_base (FH_WINDOWS, name)
{
set_cb (sizeof *this);
hWnd_ = NULL;
method_ = WINDOWS_POST;
}
int
fhandler_windows::open (const char *, int flags, mode_t)
{
set_flags (flags);
set_close_on_exec_flag (1);
set_open_status ();
return 1;
}
int
fhandler_windows::write (const void *buf, size_t)
{
MSG *ptr = (MSG *) buf;
if (method_ == WINDOWS_POST)
{
if (!PostMessage (ptr->hwnd, ptr->message, ptr->wParam, ptr->lParam))
{
__seterrno ();
return -1;
}
else
return sizeof (MSG);
}
else
return SendMessage (ptr->hwnd, ptr->message, ptr->wParam, ptr->lParam);
}
int
fhandler_windows::read (void *buf, size_t len)
{
MSG *ptr = (MSG *) buf;
int ret;
if (len < sizeof (MSG))
{
set_errno (EINVAL);
return -1;
}
ret = GetMessage (ptr, hWnd_, 0, 0);
if (ret == -1)
{
__seterrno ();
}
set_errno (0);
return ret;
}
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:
set_errno (EINVAL);
return -1;
}
return 0;
}
void
fhandler_windows::set_close_on_exec (int val)
{
if (get_handle ())
this->fhandler_base::set_close_on_exec (val);
else
this->fhandler_base::set_close_on_exec_flag (val);
void *h = hWnd_;
if (h)
set_inheritance (h, val);
}
void
fhandler_windows::fixup_after_fork (HANDLE parent)
{
if (get_handle ())
this->fhandler_base::fixup_after_fork (parent);
void *h = hWnd_;
if (h)
fork_fixup (parent, h, "hWnd_");
}
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