You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: syscall_netbsd.go
    path of file: ./repos/bzppx-codepub/vendor/golang.org/x/sys/unix
    
    the code of the file until where you have to start completion: // Copyright 2009,2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// NetBSD system calls.
// This file is compiled as ordinary Go code,
// b
    
func sysctlNodes(mib []_C_int) (nodes []Sysctlnode, err error) {
	var olen uintptr

	// Get a list of all sysctl nodes below the given MIB by performing
	// a sysctl for the given MIB with CTL_QUERY appended.
	mib = append(mib, CTL_QUERY)
	qnode := Sysctlnode{Flags: SYSCTL_VERS_1}
	qp := (*byte)(unsafe.Pointer(&qnode))
	sz := unsafe.Sizeof(qnode)
	if err = sysctl(mib, nil, &olen, qp, sz); err != nil {
		return nil, err
	}

	// Now that we know the size, get the actual nodes.
	nodes = make([]Sysctlnode, olen/sz)
	np := (*byte)(unsafe.Pointer(&nodes[0]))
	if err = sysctl(mib, np, &olen, qp, sz); err != nil {
		return nil, err
	}

	return nodes, nil
}