checkpoint

2025-09-01 06:55:30 +00:00 · 2000-01-04 20:04:42 +00:00
parent 9fd735a3d9
commit 686320ef6e
16 changed files with 1306 additions and 1558 deletions
--- a/lib/omapi/object.c
+++ b/lib/omapi/object.c
@@ -0,0 +1,133 @@
+/*
+ * Copyright (C) 1996, 1997, 1998, 1999  Internet Software Consortium.
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
+ * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
+ * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+ * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+ * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+ * SOFTWARE.
+ */
+
+/* $Id: object.c,v 1.1 2000/01/04 20:04:40 tale Exp $ */
+
+/* Principal Author: Ted Lemon */
+
+/*
+ * Functions supporting memory allocation for the object management protocol.
+ */
+#include <string.h>		/* memset */
+
+#include <isc/assertions.h>
+#include <isc/error.h>
+
+#include <omapi/private.h>
+
+void
+omapi_object_reference(omapi_object_t **r, omapi_object_t *h,
+		       const char *name)
+{
+	REQUIRE(r != NULL && *r == NULL);
+	REQUIRE(h != NULL);
+
+	(void)name;		/* Unused. */
+
+	*r = h;
+	h->refcnt++;
+}
+
+void
+omapi_object_dereference(omapi_object_t **h, const char *name) {
+	int outer_reference = 0;
+	int inner_reference = 0;
+	int handle_reference = 0;
+	int extra_references;
+	omapi_object_t *p;
+
+	REQUIRE(h != NULL && *h != NULL);
+	REQUIRE((*h)->refcnt > 0);
+
+	/*
+	 * See if this object's inner object refers to it, but don't
+	 * count this as a reference if we're being asked to free the
+	 * reference from the inner object.
+	 */
+	if ((*h)->inner != NULL && (*h)->inner->outer != NULL &&
+	    h != &((*h)->inner->outer))
+		inner_reference = 1;
+
+	/*
+	 * Ditto for the outer object.
+	 */
+	if ((*h)->outer != NULL && (*h)->outer->inner != NULL &&
+	    h != &((*h)->outer->inner))
+		outer_reference = 1;
+
+	/*
+	 * Ditto for the handle object.  The code below assumes that
+	 * the only reason we'd get a dereference from the handle
+	 * table is if this function does it - otherwise we'd have to
+	 * traverse the handle table to find the address where the
+	 * reference is stored and compare against that, and we don't
+	 * want to do that if we can avoid it.
+	 */
+	if ((*h)->handle != 0)
+		handle_reference = 1;
+
+	/*
+	 * If we are getting rid of the last reference other than
+	 * references to inner and outer objects, or from the handle
+	 * table, then we must examine all the objects in either
+	 * direction to see if they hold any non-inner, non-outer,
+	 * non-handle-table references.  If not, we need to free the
+	 * entire chain of objects.
+	 */
+	if ((*h)->refcnt ==
+	    inner_reference + outer_reference + handle_reference + 1) {
+		if (inner_reference  != 0 ||
+		    outer_reference  != 0 ||
+		    handle_reference != 0) {
+			/*
+			 * XXXTL we could check for a reference from the
+                         * handle table here.
+			 */
+			extra_references = 0;
+			for (p = (*h)->inner;
+			     p != NULL && extra_references == 0;
+			     p = p->inner) {
+				extra_references += p->refcnt - 1;
+				if (p->inner != NULL)
+					--extra_references;
+				if (p->handle != 0)
+					--extra_references;
+			}
+			for (p = (*h)->outer;
+			     p != NULL && extra_references == 0;
+			     p = p->outer) {
+				extra_references += p->refcnt - 1;
+				if (p->outer != NULL)
+					--extra_references;
+				if (p->handle != 0)
+					--extra_references;
+			}
+		} else
+			extra_references = 0;
+
+		if (extra_references == 0) {
+			if (inner_reference != 0)
+				OBJECT_DEREF(&(*h)->inner->outer, name);
+			if (outer_reference != 0)
+				OBJECT_DEREF(&(*h)->outer->inner, name);
+			if ((*h)->type->destroy != NULL)
+				(*((*h)->type->destroy))(*h, name);
+			isc_mem_put(omapi_mctx, *h, (*h)->object_size);
+		}
+	}
+	*h = NULL;
+}