kubernetes/vendor/github.com/opencontainers/runc/libcontainer/configs/namespaces_syscall.go

func (n *Namespace) Syscall() int { … }

var namespaceInfo …

// CloneFlags parses the container's Namespaces options to set the correct
// flags on clone, unshare. This function returns flags only for new namespaces.
func (n *Namespaces) CloneFlags() uintptr { … }

// IsPrivate tells whether the namespace of type t is configured as private
// (i.e. it exists and is not shared).
func (n Namespaces) IsPrivate(t NamespaceType) bool { … }