Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages


home | help
XAddConnectionWatch(3)		XLIB FUNCTIONS		XAddConnectionWatch(3)

       XAddConnectionWatch,   XRemoveConnectionWatch,  XProcessInternalConnec-
       tion, XInternalConnectionNumbers	- handle Xlib internal connections

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

       Status  XAddConnectionWatch(Display *display, XConnectionWatchProc pro-
	      cedure, XPointer client_data);

       void XRemoveConnectionWatch(Display *display, XConnectionWatchProc pro-
	      cedure, XPointer client_data);

       void XProcessInternalConnection(Display *display, int fd);

       Status  XInternalConnectionNumbers(Display  *display,  int **fd_return,
	      int *count_return);

		 Specifies the additional client data.

		 Returns the number of file descriptors.

       display	 Specifies the connection to the X server.

       fd	 Specifies the file descriptor.

       fd_return Returns the file descriptors.

       procedure Specifies the procedure to be called.

       The XAddConnectionWatch function	registers a  procedure	to  be	called
       each time Xlib opens or closes an internal connection for the specified
       display.	  The  procedure  is  passed  the   display,   the   specified
       client_data, the	file descriptor	for the	connection, a Boolean indicat-
       ing whether the connection is being opened or closed, and a pointer  to
       a  location  for	private	watch data.  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.

       This  function can be called at any time	after a	display	is opened.  If
       internal	connections already exist, the registered procedure will imme-
       diately be called for each of them, before XAddConnectionWatch returns.
       XAddConnectionWatch returns a nonzero status if the procedure  is  suc-
       cessfully registered; otherwise,	it returns zero.

       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
       display	locked	and  the result	of a call by the procedure to any Xlib
       function	that locks the display is not  defined	unless	the  executing
       thread has externally locked the	display	using XLockDisplay.

       The  XRemoveConnectionWatch  function  removes  a previously registered
       connection watch	procedure.  The	client_data must match the client_data
       used when the procedure was initially registered.

       The XProcessInternalConnection function processes input available on an
       internal	connection.  This function should be called  for  an  internal
       connection only after an	operating system facility (for example,	select
       or poll)	has indicated that input is available; otherwise,  the	effect
       is not defined.

       The  XInternalConnectionNumbers function	returns	a list of the file de-
       scriptors for all internal connections currently	open for the specified
       display.	 When the allocated list is no longer needed, free it by using
       XFree.  This functions returns a	nonzero	status if the list is success-
       fully allocated;	otherwise, it returns zero.

       Xlib - C	Language X Interface

X Version 11			 libX11	1.6.12		XAddConnectionWatch(3)


Want to link to this manual page? Use this URL:

home | help