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RedHat 9 (Linux i386) - man page for xremoveconnectionwatch (redhat section 3x11)

XAddConnectionWatch(3X11)					  XLIB FUNCTIONS					 XAddConnectionWatch(3X11)

XAddConnectionWatch, XRemoveConnectionWatch, XProcessInternalConnection, XInternalConnectionNumbers - handle Xlib internal connections
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;
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.
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.
Xlib - C Language X Interface X Version 11 Release 6.6 XAddConnectionWatch(3X11)

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