2000-06-04 21:39:33 +00:00
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>Window Manager Protocols</TITLE
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><META
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NAME="GENERATOR"
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2002-08-21 07:37:55 +00:00
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CONTENT="Modular DocBook HTML Stylesheet Version 1.72
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2000-06-04 21:39:33 +00:00
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REL="HOME"
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HREF="index.html"><LINK
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REL="PREVIOUS"
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TITLE="Application Window Properties"
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2002-08-21 07:37:55 +00:00
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HREF="x225.html"><LINK
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2000-06-04 21:39:33 +00:00
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REL="NEXT"
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TITLE="Implementation notes"
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2002-08-21 07:37:55 +00:00
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HREF="x351.html"></HEAD
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2000-06-04 21:39:33 +00:00
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2002-08-21 07:37:55 +00:00
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2000-06-04 21:39:33 +00:00
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2002-08-21 07:37:55 +00:00
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2000-06-04 21:39:33 +00:00
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2000-06-04 21:39:33 +00:00
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2000-06-04 21:39:33 +00:00
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2000-06-04 21:39:33 +00:00
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><A
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2002-08-21 07:37:55 +00:00
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NAME="AEN340"
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>6. Window Manager Protocols</A
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2000-06-04 21:39:33 +00:00
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></H1
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><A
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2002-08-21 07:37:55 +00:00
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NAME="AEN342"
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>6.1. _NET_WM_PING</A
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2000-06-04 21:39:33 +00:00
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></H2
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><P
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>This protocol allows the Window Manager to determine if the Client is still
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processing X events. This can be used by the Window Manager to determine if a
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window which fails to close after being sent WM_DELETE_WINDOW has stopped
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responding, or has stalled for some other reason, such as waiting for user
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confirmation. A Client SHOULD indicate that it is willing to participate in
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this protocol by listing _NET_WM_PING in the WM_PROTOCOLS property of the
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client window.
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</P
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><P
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>A Window Manager can use this protocol at any time by sending a client message
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as follows:
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</P
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><PRE
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CLASS="PROGRAMLISTING"
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>type = ClientMessage
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window = the respective client window
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message_type = WM_PROTOCOLS
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format = 32
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data.l[0] = _NET_WM_PING
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2002-08-21 07:37:55 +00:00
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data.l[1] = timestamp</PRE
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2000-06-04 21:39:33 +00:00
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><P
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>A participating Client receiving this message MUST send it back to the root
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window immediately, by setting window = root, and calling XSendEvent. The
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Client MUST NOT alter the timestamp, as this can be used by the Window Manager
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to uniquely identify the ping.
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</P
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><P
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>The Window Manager MAY kill the Client (using _NET_WM_PID) if it fails to
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respond to this protocol within a reasonable time.
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</P
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2002-08-21 07:37:55 +00:00
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><P
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>See also the implementation notes on <A
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HREF="x351.html#KILLINGWINDOWS"
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>killing hung processes</A
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>.
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</P
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2000-06-04 21:39:33 +00:00
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2002-08-21 07:37:55 +00:00
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2000-06-04 21:39:33 +00:00
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2002-08-21 07:37:55 +00:00
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HREF="x225.html"
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ACCESSKEY="P"
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2000-06-04 21:39:33 +00:00
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>Prev</A
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2002-08-21 07:37:55 +00:00
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2000-06-04 21:39:33 +00:00
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2002-08-21 07:37:55 +00:00
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HREF="x351.html"
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ACCESSKEY="N"
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2000-06-04 21:39:33 +00:00
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>Next</A
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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>Application Window Properties</TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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> </TD
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><TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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>Implementation notes</TD
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></TR
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