Init

sys/specfs/spec_clone.c

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+#ifndef	lint
+static	char sccsid[] = "@(#)spec_clone.c 1.1 94/10/31 Copyr 1986 Sun Micro";
+#endif	lint
+
+/*
+ * Copyright (c) 1986 by Sun Microsystems, Inc.
+ */
+
+/*
+ * Clone device driver.  Forces a clone open of some other
+ * character device.  Since its purpose in life is to force
+ * some other device to clone itself, there's no need for
+ * anything other than the open routine here.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/user.h>
+
+/*
+ * Do a clone open.  The (major number of the) device to be cloned
+ * is specified by minor(dev).  We tell spec_open to do the work
+ * by returning EEXIST after naming the device to clone.
+ */
+/* ARGSUSED */
+cloneopen(dev, flag, newdevp)
+	dev_t	dev;
+	int	flag;
+	dev_t	*newdevp;
+{
+	/* Convert to the device to be cloned. */
+	*newdevp = makedev(minor(dev), 0);
+
+	return (EEXIST);
+}