2017-08-27 Paul Pluzhnikov <ppluzhnikov@google.com>

	* stdlib/Makefile (tst-atexit, tst-at_quick_exit): New tests.
	(tst-cxa_atexit, tst-on_exit): Likewise.
	* stdlib/Makefile (tests): Add tst-atexit, tst-at_quick_exit,
	tst-cxa_atexit, and tst-on_exit.
	* stdlib/tst-atexit-common.c: New file.
	* stdlib/tst-atexit.c: New file.
	* stdlib/tst-at_quick_exit.c: New file.
	* stdlib/tst-cxa_atexit.c: New file.
	* stdlib/tst-on_exit.c: New file.

1 files changed, 95 insertions, 0 deletions

diff --git a/stdlib/tst-atexit-common.c b/stdlib/tst-atexit-common.c
new file mode 100644
index 0000000..262235a
--- /dev/null
+++ b/stdlib/tst-atexit-common.c
@@ -0,0 +1,95 @@
+/* Helper file for tst-{atexit,at_quick_exit,cxa_atexit,on_exit}.
+   Copyright (C) 2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#define MAX_ATEXIT 20  /* Large enough for current set of invocations.  */
+static char crumbs[MAX_ATEXIT];
+static int next_slot = 0;
+
+static void
+fn0 (void)
+{
+  crumbs[next_slot++] = '0';
+}
+
+static void
+fn1 (void)
+{
+  crumbs[next_slot++] = '1';
+}
+
+static void
+fn2 (void)
+{
+  crumbs[next_slot++] = '2';
+  ATEXIT (fn1);
+}
+
+static void
+fn3 (void)
+{
+  crumbs[next_slot++] = '3';
+  ATEXIT (fn2);
+  ATEXIT (fn0);
+}
+
+static void
+fn_final (void)
+{
+  /* Arbitrary sequence matching current registrations.  */
+  const char expected[] = "3021121130211";
+
+  if (strcmp (crumbs, expected) == 0)
+    _exit (0);
+
+  printf ("crumbs:   %s\n", crumbs);
+  printf ("expected: %s\n", expected);
+  _exit (1);
+}
+
+/* This is currently just a basic test to verify that exit handlers execute
+   in LIFO order, even when the handlers register additional new handlers.
+
+   TODO: Additional tests that we should do:
+   1. POSIX says we need to support at least ATEXIT_MAX
+   2. Verify that fork'd child inherit the registrations of the parent.
+   3. ...  */
+
+static int
+do_test (void)
+{
+  /* Register this first so it can verify expected order of the rest.  */
+  ATEXIT (fn_final);
+
+  ATEXIT (fn1);
+  ATEXIT (fn3);
+  ATEXIT (fn1);
+  ATEXIT (fn2);
+  ATEXIT (fn1);
+  ATEXIT (fn3);
+
+  EXIT (2);  /* If we see this exit code, fn_final must have not worked.  */
+}
+
+#define TEST_FUNCTION do_test
+#include <support/test-driver.c>