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XConnectionWatchProc(3X)	XLIB FUNCTIONS	      XConnectionWatchProc(3X)

NAME
       XConnectionWatchProc - procedure called when internal connection opens
       or closes

SYNTAX
       typedef void (*XConnectionWatchProc)(display, client_data, fd, opening,
       watch_data)
	     Display *display;
	     XPointer client_data;
	     int fd;
	     Bool opening;
	     XPointer *watch_data;

ARGUMENTS
       display	 Specifies the connection to the X server.

       client_data
		 Specifies the additional client data.

       fd	 Specifies the file descriptor.

       opening	 Specifies whether the connections is being opened or closed.

       watch_data
		 Specifies a location for private watch_data.

DESCRIPTION
       XConnectionWatchProc is registered by XAddConnectionWatch() and is
       called each time Xlib opens or closed an internal connection for the
       specified display.

       If opening is True, the procedure can store a pointer to private data
       in the location pointed to by watch_data; when the procedure is later
       called for this same connection and opening is False, the location
       pointed to by watch_data will hold this same private data pointer.

       The registered procedure should not call any Xlib functions. If the
       procedure directly or indirectly causes the state of internal connec‐
       tions or watch procedures to change, the result is not defined. If Xlib
       has been initialized for threads, the procedure is called with the dis‐
       play locked and the result of a call by the procedure to any Xlib func‐
       tion that locks the display is not defined unless the executing thread
       has externally locked the display using XLockDisplay.

SEE ALSO
       XAddConnectionWatch(3X)

X Version 11			   Release 6	      XConnectionWatchProc(3X)

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