gschk(volbuf.i2a.r, status.i2.r)

	This routine checks for new GAS list data and returns the status
	of a new GAS list update or a pending message.
	volbuf		buffer specified in original GSLIST call
	status		returned ACNET standard status value
			(OK -> success,
			 CAMAC_FE_PEND -> data is pending,
			 CAMAC_FE_FEDOWN -> front end is down,
			 CAMAC_FE_GASBUSY -> busy or a one shot read has an
					     outstanding reply,
			 CAMAC_FE_NOLIST -> no such list,
			 CAMAC_FE_REQFAIL -> no reply ID, request failed,
			 CAMAC_FE_ALRDYREAD -> one shot has already been read)

	This function requires the following include files:

	clib_h, acnet_errors_h

	Related functions:

	gslist, gsset, gsread, gsget, gsgetw, gslend, gstanc, gsmod, gsboot,