rd_ctl
if (rd_ctl(RD_CTL_SET_HELPPATH, (void *)mdb.m_root) != RD_OK) {
static char rd_ctl[] = "/dev/" RD_CTL_NAME;
ctl_fd = open(rd_ctl, openflag);
die("%s", rd_ctl);
extern rd_err_e rd_ctl(int, void *);
rbf->rxdesc->rd_ctl = (ctl);
uint32_t rd_ctl;
#define rd_stat rd_ctl