KeepAlive(addr) // Just for consistency. Hopefully addr is not a Go address.
}
func munmap_trampoline()

//go:nosplit
//go:cgo_unsafe_args
func madvise(addr unsafe.Pointer, n uintptr, flags int32) {
	libcCall(unsafe.Pointer(abi.FuncPCABI0(madvise_trampoline)), unsafe.Pointer(&addr))
	KeepAlive(addr) // Just for consistency. Hopefully addr is not a Go address.
}

	return mapper.Mmap(fd, offset, length, prot, flags)
}

func Munmap(b []byte) (err error) {
	return mapper.Munmap(b)
}

//sys	Madvise(b []byte, advice int) (err error)
//sys	Mprotect(b []byte, prot int) (err error)
//sys	Mlock(b []byte) (err error)
//sys	Munlock(b []byte) (err error)
//sys	Mlockall(flags int) (err error)

		runtime.ExitSyscall()
	}
	if r0 != 0 {
		err = errnoErr2(e1, e2)
	}
	return
}

// Dummy function: there are no semantics for Madvise on z/OS
func Madvise(b []byte, advice int) (err error) {
	return
}

func Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, err error) {
	return mapper.Mmap(fd, offset, length, prot, flags)
}

	//
	// a := &s
	// ptr, len, cap := s
	// len += 3
	// if uint(len) > uint(cap) {
	//    ptr, len, cap = growslice(ptr, len, cap, 3, typ)
	//    vardef(a)    // if necessary, advise liveness we are writing a new a
	//    *a.cap = cap // write before ptr to avoid a spill
	//    *a.ptr = ptr // with write barrier
	// }
	// *a.len = len
	// // with write barriers, if needed: