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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <syserr.h>
include "mtio.h"
# MT_GLOCK -- Return the lockfile name for the given magtape device
# specification. There can be many logical devices, defined in the tapecap
# file, which refer to the same physical device. All entries for the same
# physical device share the same i/o device file and lock file. If the
# physical device is on a remote node the tapecap file on that node should
# be accessed, and the node name must be included in the lockfile file name,
# although the lock file is always written on the local node.
procedure mt_glock (mtname, lockfile, maxch)
char mtname[ARB] #I full magtape device spec
char lockfile[ARB] #O receives lockfile name
int maxch #I max chars out
int filno, recno
pointer sp, lkname, device, devcap, gty
errchk mt_gtyopen, syserrs
int gtygets()
pointer mt_gtyopen()
begin
call smark (sp)
call salloc (lkname, SZ_FNAME, TY_CHAR)
call salloc (device, SZ_FNAME, TY_CHAR)
call salloc (devcap, SZ_DEVCAP, TY_CHAR)
call mtparse (mtname,
Memc[device], SZ_FNAME, filno, recno, Memc[devcap], SZ_DEVCAP)
# The "lk" capability specifies the lock file root name.
gty = mt_gtyopen (Memc[device], Memc[devcap])
if (gtygets (gty, "lk", Memc[lkname], SZ_FNAME) <= 0) {
call eprintf ("missing `lk' parameter in tapecap entry for %s\n")
call pargstr (mtname)
call syserrs (SYS_MTTAPECAP, mtname)
}
call ki_xnode (Memc[device], Memc[lkname], SZ_FNAME)
call mt_lockname (Memc[lkname], lockfile, maxch)
call sfree (sp)
end
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