prid
prid(UID, uid);
prid(GID, gid);
prid(EUID, euid);
prid(EGID, egid);
static void prid(TYPE, uid_t);
dtrace_probe_lookup(dtrace_provider_id_t prid, const char *mod,
pkey.dtpk_prov = ((dtrace_provider_t *)prid)->dtpv_name;