1 files changed, 89 insertions, 0 deletions
diff --git a/lib/isc/backtrace.c b/lib/isc/backtrace.c
new file mode 100644
index 0000000..3ac23c8
--- /dev/null
+++ b/lib/isc/backtrace.c
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*! \file */
+
+#include <stdlib.h>
+#include <string.h>
+#ifdef HAVE_BACKTRACE_SYMBOLS
+#include <execinfo.h>
+#endif /* HAVE_BACKTRACE_SYMBOLS */
+
+#include <isc/backtrace.h>
+#include <isc/print.h>
+#include <isc/result.h>
+#include <isc/util.h>
+
+#if HAVE_BACKTRACE_SYMBOLS
+int
+isc_backtrace(void **addrs, int maxaddrs) {
+	int n;
+
+	/*
+	 * Validate the arguments: intentionally avoid using REQUIRE().
+	 * See notes in backtrace.h.
+	 */
+	if (addrs == NULL || maxaddrs <= 0) {
+		return (-1);
+	}
+
+	/*
+	 * backtrace(3) includes this function itself in the address array,
+	 * which should be eliminated from the returned sequence.
+	 */
+	n = backtrace(addrs, maxaddrs);
+	if (n < 2) {
+		return (-1);
+	}
+	n--;
+	memmove(addrs, &addrs[1], sizeof(addrs[0]) * n);
+
+	return (n);
+}
+
+char **
+isc_backtrace_symbols(void *const *buffer, int size) {
+	return (backtrace_symbols(buffer, size));
+}
+
+void
+isc_backtrace_symbols_fd(void *const *buffer, int size, int fd) {
+	backtrace_symbols_fd(buffer, size, fd);
+}
+
+#else /* HAVE_BACKTRACE_SYMBOLS */
+
+int
+isc_backtrace(void **addrs, int maxaddrs) {
+	UNUSED(addrs);
+	UNUSED(maxaddrs);
+
+	return (-1);
+}
+
+char **
+isc_backtrace_symbols(void *const *buffer, int size) {
+	UNUSED(buffer);
+	UNUSED(size);
+
+	return (NULL);
+}
+
+void
+isc_backtrace_symbols_fd(void *const *buffer, int size, int fd) {
+	UNUSED(buffer);
+	UNUSED(size);
+	UNUSED(fd);
+}
+
+#endif /* HAVE_BACKTRACE_SYMBOLS */