Custom DTrace kernel module files plus FreeBSD-specific DTrace providers.

1 files changed, 61 insertions, 0 deletions

diff --git a/sys/cddl/dev/dtrace/dtrace_clone.c b/sys/cddl/dev/dtrace/dtrace_clone.c
new file mode 100644
index 0000000..52e48ff
--- /dev/null
+++ b/sys/cddl/dev/dtrace/dtrace_clone.c
@@ -0,0 +1,61 @@
+/*-
+ * Copyright (C) 2006 John Birrell <jb@freebsd.org>.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice(s), this list of conditions and the following disclaimer as
+ *    the first lines of this file unmodified other than the possible 
+ *    addition of one or more copyright notices.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice(s), this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * $FreeBSD$
+ *
+ */
+
+static void
+dtrace_clone(void *arg, struct ucred *cred, char *name, int namelen, struct cdev **dev)
+{
+	int u = -1;
+	size_t len;
+
+	if (*dev != NULL)
+		return;
+
+	len = strlen(name);
+
+	if (len != 6 && len != 13)
+		return;
+
+	if (bcmp(name,"dtrace",6) != 0)
+		return;
+
+	if (len == 13 && bcmp(name,"dtrace/dtrace",13) != 0)
+		return;
+
+	/* Clone the device to the new minor number. */
+	if (clone_create(&dtrace_clones, &dtrace_cdevsw, &u, dev, 0) != 0)
+		/* Create the /dev/dtrace/dtraceNN entry. */
+		*dev = make_dev_cred(&dtrace_cdevsw, unit2minor(u), cred,
+		     UID_ROOT, GID_WHEEL, 0600, "dtrace/dtrace%d", u);
+	if (*dev != NULL) {
+		dev_ref(*dev);
+		(*dev)->si_flags |= SI_CHEAPCLONE;
+	}
+}