px_lib_msiq_gethead
extern int px_lib_msiq_gethead(dev_info_t *dip, msiqid_t msiq_id,
(void) px_lib_msiq_gethead(px_p->px_dip,
(void) px_lib_msiq_gethead(px_p->px_dip, first_msiq_id,
(void) px_lib_msiq_gethead(px_p->px_dip, i,
(void) px_lib_msiq_gethead(px_p->px_dip, *msiq_id_p,