Add missing atexit implementation.

lib/libc/stdlib/cxa_thread_atexit.c

@@ -0,0 +1,76 @@
+/* $NetBSD: cxa_thread_atexit.c,v 1.1 2017/07/11 15:21:35 joerg Exp $ */
+
+/*-
+ * Copyright (c) 2017 Joerg Sonnenberger <[email protected]>
+ * 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, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, 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 AUTHOR AND CONTRIBUTORS ``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 AUTHOR OR CONTRIBUTORS 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.
+ */
+
+#include <sys/cdefs.h>
+#include <sys/queue.h>
+#include <stdlib.h>
+
+#include "atexit.h"
+
+__dso_hidden bool __cxa_thread_atexit_used;
+
+struct cxa_dtor {
+	SLIST_ENTRY(cxa_dtor) link;
+	void *dso_symbol;
+	void *obj;
+	void (*dtor)(void *);
+};
+
+/* Assumes NULL initialization. */
+static /* __thread */ SLIST_HEAD(, cxa_dtor) cxa_dtors = SLIST_HEAD_INITIALIZER(cxa_dstors);
+
+void
+__cxa_thread_run_atexit(void)
+{
+	struct cxa_dtor *entry;
+
+	while ((entry = SLIST_FIRST(&cxa_dtors)) != NULL) {
+		SLIST_REMOVE_HEAD(&cxa_dtors, link);
+		(*entry->dtor)(entry->obj);
+		free(entry);
+	}
+}
+
+int	__cxa_thread_atexit(void (*)(void *), void *, void *);
+
+int
+__cxa_thread_atexit_impl(void (*dtor)(void *), void *obj, void *dso_symbol)
+{
+	struct cxa_dtor *entry;
+
+	__cxa_thread_atexit_used = true;
+
+	entry = malloc(sizeof(*entry));
+	if (entry == NULL)
+		return -1;
+	entry->dso_symbol = dso_symbol;
+	entry->obj = obj;
+	entry->dtor = dtor;
+	SLIST_INSERT_HEAD(&cxa_dtors, entry, link);
+	return 0;
+}

lib/libc/stdlib/exit.c

@@ -32,13 +32,18 @@
 #include <sys/cdefs.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include "atexit.h"
+#include "reentrant.h"
 
 void (*__cleanup)(void);
 
 /*
  * Exit, flushing stdio buffers if necessary.
  */
 void exit(int status) {
+  if (__cxa_thread_atexit_used)
+    __cxa_thread_run_atexit();
+  __cxa_finalize(NULL);
   if (__cleanup)
     (*__cleanup)();
   _exit(status);