Gets information about a link.
This function is used to verify if a link (pointed to by path) really exists (using the same method as the S_ISLNK macro defined in stat.h).
Path to the link.
linkinfo returns the st_dev field of the Unix C stat structure returned by the lstat system call. Returns a non-negative integer on success, -1 in case the link was not found, or false if an open.base_dir violation occurs.