04-22-2014
Hi Jimmyf,
I presume you don't actually want to alter the file, just the display?
How are you opening the file?
Regards
Gull04
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LEARN ABOUT REDHAT
xremoveconnectionwatch
XAddConnectionWatch(3X11) XLIB FUNCTIONS XAddConnectionWatch(3X11)
NAME
XAddConnectionWatch, XRemoveConnectionWatch, XProcessInternalConnection, XInternalConnectionNumbers - handle Xlib internal connections
SYNTAX
typedef void (*XConnectionWatchProc)(display, client_data, fd, opening, watch_data)
Display *display;
XPointer client_data;
int fd;
Bool opening;
XPointer *watch_data;
Status XAddConnectionWatch(display, procedure, client_data)
Display *display;
XWatchProc procedure;
XPointer client_data;
Status XRemoveConnectionWatch(display, procedure, client_data)
Display *display;
XWatchProc procedure;
XPointer client_data;
void XProcessInternalConnection(display, fd)
Display *display;
int fd;
Status XInternalConnectionNumbers(display, fd_return, count_return)
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 connections 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 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 inter-
nal 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 descriptors for all internal connections currently open for the speci-
fied 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 Release 6.6 XAddConnectionWatch(3X11)