Initial commit

1 files changed, 36 insertions, 0 deletions

diff --git a/sys/mtio/mtcap.x b/sys/mtio/mtcap.x
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--- /dev/null
+++ b/sys/mtio/mtcap.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include "mtio.h"
+
+# MTCAP -- Return the tapecap descriptor for the given magtape device.  The
+# device is specified by the full specification (as passed to mtopen), hence
+# there may be tapecap attributes in the device specification which override
+# those in the tapecap file.
+
+pointer procedure mtcap (mtname)
+
+char	mtname[ARB]			#I magtape device specification
+
+int	fileno, recno
+pointer	sp, device, devcap, cache_gty, gty
+pointer	mt_gtyopen(), gtycaps(), gtyopen()
+errchk	mtparse, mt_gtyopen
+
+begin
+	call smark (sp)
+	call salloc (device, SZ_DEVICE, TY_CHAR)
+	call salloc (devcap, SZ_DEVCAP, TY_CHAR)
+
+	call mtparse (mtname, Memc[device], SZ_DEVICE, fileno, recno,
+	    Memc[devcap], SZ_DEVCAP)
+
+	# Do not return the cached MTIO device entry, as we do not want the
+	# application to close this with gtyclose.  Open a new GTY descriptor
+	# using the capabilities in the cached entry.
+
+	cache_gty = mt_gtyopen (Memc[device], Memc[devcap])
+	gty = gtyopen ("", "", Memc[gtycaps(cache_gty)])
+
+	call sfree (sp)
+	return (gty)
+end