152 lines
3.2 KiB
C++
152 lines
3.2 KiB
C++
/* fhandler_windows.cc: code to access windows message queues.
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Copyright 1998 Cygnus Solutions.
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Written by Sergey S. Okhapkin (sos@prospect.com.ru).
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Feedback and testing by Andy Piper (andyp@parallax.co.uk).
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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 <errno.h>
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#include <wingdi.h>
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#include <winuser.h>
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#include "cygerrno.h"
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#include "security.h"
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#include "fhandler.h"
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/*
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The following unix-style calls are supported:
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open ("/dev/windows", flags, mode=0)
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- create a unix fd for message queue.
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O_NONBLOCK flag controls the read() call behavior.
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read (fd, buf, len)
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- return next message from queue. buf must point to MSG
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structure, len must be >= sizeof (MSG). If read is set to
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non-blocking and the queue is empty, read call returns -1
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immediately with errno set to EAGAIN, otherwise it blocks
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untill the message will be received.
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write (fd, buf, len)
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- send a message pointed by buf. len argument ignored.
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ioctl (fd, command, *param)
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- control read()/write() behavior.
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ioctl (fd, WINDOWS_POST, NULL): write() will PostMessage();
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ioctl (fd, WINDOWS_SEND, NULL): write() will SendMessage();
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ioctl (fd, WINDOWS_HWND, &hWnd): read() messages for
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hWnd window.
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select () call marks read fd when any message posted to queue.
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*/
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fhandler_windows::fhandler_windows (const char *name) :
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fhandler_base (FH_WINDOWS, name)
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{
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set_cb (sizeof *this);
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hWnd_ = NULL;
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method_ = WINDOWS_POST;
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}
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int
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fhandler_windows::open (const char *, int flags, mode_t)
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{
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set_flags (flags);
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set_close_on_exec_flag (1);
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set_open_status ();
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return 1;
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}
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int
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fhandler_windows::write (const void *buf, size_t)
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{
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MSG *ptr = (MSG *) buf;
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if (method_ == WINDOWS_POST)
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{
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if (!PostMessage (ptr->hwnd, ptr->message, ptr->wParam, ptr->lParam))
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{
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__seterrno ();
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return -1;
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}
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else
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return sizeof (MSG);
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}
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else
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return SendMessage (ptr->hwnd, ptr->message, ptr->wParam, ptr->lParam);
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}
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int
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fhandler_windows::read (void *buf, size_t len)
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{
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MSG *ptr = (MSG *) buf;
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int ret;
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if (len < sizeof (MSG))
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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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ret = GetMessage (ptr, hWnd_, 0, 0);
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if (ret == -1)
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{
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__seterrno ();
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}
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set_errno (0);
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return ret;
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}
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int
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fhandler_windows::ioctl (unsigned int cmd, void *val)
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{
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switch (cmd)
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{
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case WINDOWS_POST:
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case WINDOWS_SEND:
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method_ = cmd;
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break;
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case WINDOWS_HWND:
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if (val == NULL)
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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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hWnd_ = * ((HWND *) val);
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break;
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default:
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set_errno (EINVAL);
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return -1;
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}
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return 0;
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}
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void
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fhandler_windows::set_close_on_exec (int val)
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{
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if (get_handle ())
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this->fhandler_base::set_close_on_exec (val);
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else
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this->fhandler_base::set_close_on_exec_flag (val);
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void *h = hWnd_;
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if (h)
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set_inheritance (h, val);
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}
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void
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fhandler_windows::fixup_after_fork (HANDLE parent)
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{
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if (get_handle ())
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this->fhandler_base::fixup_after_fork (parent);
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void *h = hWnd_;
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if (h)
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fork_fixup (parent, h, "hWnd_");
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}
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