Fields
- mps_pset: mach_port_rights_t
- mps_seqno: mach_port_seqno_t
- mps_mscount: mach_port_mscount_t
- mps_qlimit: mach_port_msgcount_t
- mps_msgcount: mach_port_msgcount_t
- mps_sorights: mach_port_rights_t
- mps_srights: u32
- mps_pdrequest: u32
- mps_nsrequest: u32
- mps_flags: u32