Macros starting with `u' in BSD4-4

• UIHASH kern/kern_proc.c:62
• UIOCCMD sys/ioctl.h:143
• UIOMOVE net/bpf.c:92
• UMAP_NHASH miscfs/umapfs/umap_subr.c:54
• UMAPTOV miscfs/umapfs/umap.h:81
• UMAPVPTOLOWERVP miscfs/umapfs/umap.h:84
• UNIT i386/isa/com.c:110
• USES_PDN netiso/tp_pcb.h:262