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182 lines
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3 KiB
HTML
<HTML
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>Window Manager Protocols</TITLE
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NAME="AEN340"
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>6. Window Manager Protocols</A
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></H1
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="AEN342"
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>6.1. _NET_WM_PING</A
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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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data.l[1] = timestamp</PRE
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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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><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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>Application Window Properties</TD
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WIDTH="34%"
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> </TD
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>Implementation notes</TD
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> |