2.9BSD/usr/src/lib/c/sys/vhangup.s

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/ error	= vhangup();

.globl	_vhangup
.globl	cerror

_vhangup:
	mov	r5,-(sp)
	mov	sp,r5
	sys	local; 9f
	bec	1f
	jmp	cerror
1:
	mov	(sp)+,r5
	rts	pc
.data
9:
	sys	vhangup