XFree(3) XLIB FUNCTIONS XFree(3)
XFree - free client data
int XFree(void *data);
data Specifies the data that are to be freed.
The XFree function is a general-purpose Xlib routine that frees the
specified data. You must use it to free any objects that were allo-
cated by Xlib, unless an alternate function is explicitly specified for
the object. A NULL pointer cannot be passed to this function.
Xlib - C Language X Interface
X Version 11 libX11 1.1.5 XFree(3)