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X11R7.4 - man page for xaddconnectionwatch (x11r4 section 3)

XAddConnectionWatch(3)			  XLIB FUNCTIONS		   XAddConnectionWatch(3)

NAME
       XAddConnectionWatch, XRemoveConnectionWatch, XProcessInternalConnection, XInternalConnec-
       tionNumbers - handle Xlib internal connections

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

       Status XAddConnectionWatch(Display *display, XWatchProc procedure, XPointer client_data);

       Status XRemoveConnectionWatch(Display *display, XWatchProc procedure, XPointer
	      client_data);

       void XProcessInternalConnection(Display *display, int fd);

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

ARGUMENTS
       client_data
		 Specifies the additional client data.

       count_return
		 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.

DESCRIPTION
       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
       indicating 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 connec-
       tions already exist, the registered procedure will immediately be called for each of them,
       before XAddConnectionWatch returns.  XAddConnectionWatch returns a nonzero status if the
       procedure is successfully 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 connections 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 pro-
       cedure.	The client_data must match the client_data used when the procedure was initially
       registered.

       The XProcessInternalConnection function processes input available on an internal connec-
       tion.  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; oth-
       erwise, the effect is not defined.

       The XInternalConnectionNumbers function returns a list of the file descriptors 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 successfully allocated; otherwise, it returns zero.

SEE ALSO
       Xlib - C Language X Interface

X Version 11				   libX11 1.2.1 		   XAddConnectionWatch(3)


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