1 files changed, 64 insertions, 0 deletions
diff --git a/support/tst-xsigstack.c b/support/tst-xsigstack.c
new file mode 100644
index 0000000..42859c7
--- /dev/null
+++ b/support/tst-xsigstack.c
@@ -0,0 +1,64 @@
+/* Test of sigaltstack wrappers.
+   Copyright (C) 2019 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 <support/xsignal.h>
+#include <support/support.h>
+#include <support/xunistd.h>
+#include <support/check.h>
+
+#include <stdint.h>
+#include <stdio.h>
+
+static volatile uintptr_t handler_stackaddr;
+
+static void
+handler (int unused)
+{
+  int var;
+  handler_stackaddr = (uintptr_t) &var;
+}
+
+int
+do_test (void)
+{
+  void *sstk = xalloc_sigstack (0);
+
+  unsigned char *sp;
+  size_t size;
+  xget_sigstack_location (sstk, &sp, &size);
+  printf ("signal stack installed: sp=%p size=%zu\n", sp, size);
+
+  struct sigaction sa;
+  sa.sa_handler = handler;
+  sa.sa_flags   = SA_RESTART | SA_ONSTACK;
+  sigfillset (&sa.sa_mask);
+  if (sigaction (SIGUSR1, &sa, 0))
+    FAIL_RET ("sigaction (SIGUSR1, handler): %m\n");
+
+  raise (SIGUSR1);
+
+  uintptr_t haddr = handler_stackaddr;
+  printf ("address of handler local variable: %p\n", (void *)haddr);
+  TEST_VERIFY ((uintptr_t)sp < haddr);
+  TEST_VERIFY (haddr < (uintptr_t)sp + size);
+
+  xfree_sigstack (sstk);
+  return 0;
+}
+
+#include <support/test-driver.c>