gptfind
while (gptfind(&freebsd_ufs_uuid, &dsk, -1) != -1) {
if (gptfind(&freebsd_ufs_uuid, &gdsk.dsk, gdsk.dsk.part) == -1) {
if (gptfind(&freebsd_ufs_uuid, &gdsk.dsk, -1) == -1)
int gptfind(const uuid_t *uuid, struct dsk *dskp, int part);