smb_rq_getenv
error = smb_rq_getenv(cp, &vcp, NULL);
error = smb_rq_getenv(source, &t2p->t2_vc, NULL);
static int smb_rq_getenv(struct smb_connobj *layer,
error = smb_rq_getenv(layer, &rqp->sr_vc, &rqp->sr_share);