XConnectionWatchProc(3X) XLIB FUNCTIONS XConnectionWatchProc(3X)
NAME
XConnectionWatchProc - procedure called when internal connection opens or closes
SYNTAX
typedef void (*XConnectionWatchProc)(display, client_data, fd, opening, watch_data)
Display *display;
XPointer client_data;
int fd;
Bool opening;
XPointer *watch_data;
ARGUMENTS
display Specifies the connection to the X server.
client_data
Specifies the additional client data.
fd Specifies the file descriptor.
opening Specifies whether the connections is being opened or closed.
watch_data
Specifies a location for private watch_data.
DESCRIPTION
XConnectionWatchProc is registered by XAddConnectionWatch() and is called each time Xlib opens or closed an internal connection for the
specified display.
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.
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.
SEE ALSO
XAddConnectionWatch(3X)
X Version 11 Release 6 XConnectionWatchProc(3X)
