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

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/ error	= dup(fildes);
/ error	= dup2(fildes, fildes2);

.globl	_dup,_dup2
.globl	cerror

_dup2:
	mov	r5,-(sp)
	mov	sp,r5
	mov	4(r5),r0
	bis	$100,r0
	br	1f

_dup:
	mov	r5,-(sp)
	mov	sp,r5
	mov	4(r5),r0
1:
	mov	6(r5),r1
	sys	dup
	bec	1f
	jmp	cerror
1:
	mov	(sp)+,r5
	rts	pc