1 files changed, 53 insertions, 0 deletions
diff --git a/sys/gio/cursor/gtrreset.x b/sys/gio/cursor/gtrreset.x
new file mode 100644
index 00000000..36c55a9a
--- /dev/null
+++ b/sys/gio/cursor/gtrreset.x
@@ -0,0 +1,53 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<error.h>
+include	<gio.h>
+include	"gtr.h"
+
+# GTR_RESET -- Reset the graphics system.  Disconnect all connected subkernels
+# and free all file descriptors and memory.
+
+procedure gtr_reset (status)
+
+int	status				# not used (req. for ONEXIT)
+
+pointer	tr
+int	stream
+bool	streq()
+include	"gtr.com"
+
+begin
+	do stream = STDGRAPH, STDPLOT {
+	    tr = trdes[stream]
+	    if (tr == NULL)
+		next
+
+	    iferr {
+		# Close device graphcap descriptor.
+		if (TR_TTY(tr) != NULL)
+		    call ttycdes (TR_TTY(tr))
+
+		# Disconnect old kernel.
+		if (streq (TR_KERNFNAME(tr), "cl"))
+		    call stg_close()
+		else if (TR_DEVNAME(tr) != EOS && TR_KERNFNAME(tr) != EOS) {
+		    call gtr_disconnect (TR_PID(tr),
+			TR_IN(tr), TR_OUT(tr), stream)
+		    TR_PID(tr) = NULL
+		    TR_IN(tr) = NULL
+		    TR_OUT(tr) = NULL
+		}
+	    } then {
+		TR_DEVNAME(tr) = EOS
+		call erract (EA_WARN)
+	    } else
+		TR_DEVNAME(tr) = EOS
+
+	    # Free all storage.
+	    call mfree (TR_FRAMEBUF(tr), TY_SHORT)
+	    call mfree (TR_SCRATCHBUF(tr), TY_SHORT)
+	    call mfree (tr, TY_STRUCT)
+
+	    trdes[stream] = NULL
+	}
+end