ts_open_restricted - use a custom function for opening the touchscreen's input
device file
#include <tslib.h>
int (*ts_open_restricted)(const char *path, int flags, void *user_data);
ts_open_restricted() is useful if libts should not be run as root. If
such a function is implemented by the user and assigned to the
ts_open_restricted pointer, it will be called by ts_open() instead of the
open() system call directly.
It should open the input device at path with flags
while user_data is currently unused.
the touchscreen input device' file descriptor
ts_close_restricted(3), ts_open(3), ts_setup(3),
ts_close(3), ts.conf(5)