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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <mach.h>
include <knet.h>
include "iis.h"
# IISOPN -- Open IIS display.
procedure iisopn (devinfo, mode, chan)
char devinfo[ARB] # device info for zopen
int mode # access mode
int chan[ARB] # receives IIS descriptor
bool first_time
data first_time /true/
include "iis.com"
begin
if (first_time) {
iisnopen = 0
first_time = false
}
# We permit multiple opens but only open the physical device once.
if (iisnopen == 0)
call zopngd (devinfo, mode, iischan)
if (iischan == ERR)
chan[1] = ERR
else {
iisnopen = iisnopen + 1
chan[1] = iischan
}
end
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