Synchronously reverse-resolves address to determine its
associated hostname.
If the DNS resolution fails, error (if non-NULL) will be set to
a value from GResolverError.
If cancellable is non-NULL, it can be used to cancel the
operation, in which case error (if non-NULL) will be set to
G_IO_ERROR_CANCELLED.
Since 2.22
Synchronously reverse-resolves address to determine its associated hostname. If the DNS resolution fails, error (if non-NULL) will be set to a value from GResolverError. If cancellable is non-NULL, it can be used to cancel the operation, in which case error (if non-NULL) will be set to G_IO_ERROR_CANCELLED. Since 2.22