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;
|display||Specifies the connection to the X server.|
|procedure||Specifies the procedure to be called.|
|client_data||Specifies the additional client data.|
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 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().