/ error	= setgrp(groups);
/	  short	groups[NGRPS/(sizeof(short)*8)];

.globl	_setgrp
.globl	cerror

_setgrp:
	mov	r5,-(sp)
	mov	sp,r5
	mov	4(r5),0f
	sys	0; 9f
	bec	1f
	jmp	cerror
1:
	clr	r0
	mov	(sp)+,r5
	rts	pc
.data
9:
	sys	setgrp; 0:..