1 files changed, 106 insertions, 0 deletions
diff --git a/REORG.TODO/support/support_record_failure.c b/REORG.TODO/support/support_record_failure.c
new file mode 100644
index 0000000000..684055c746
--- /dev/null
+++ b/REORG.TODO/support/support_record_failure.c
@@ -0,0 +1,106 @@
+/* Global test failure counter.
+   Copyright (C) 2016-2017 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 <support/check.h>
+#include <support/support.h>
+#include <support/test-driver.h>
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+/* This structure keeps track of test failures.  The counter is
+   incremented on each failure.  The failed member is set to true if a
+   failure is detected, so that even if the counter wraps around to
+   zero, the failure of a test can be detected.
+
+   The init constructor function below puts *state on a shared
+   annonymous mapping, so that failure reports from subprocesses
+   propagate to the parent process.  */
+struct test_failures
+{
+  unsigned int counter;
+  unsigned int failed;
+};
+static struct test_failures *state;
+
+static __attribute__ ((constructor)) void
+init (void)
+{
+  void *ptr = mmap (NULL, sizeof (*state), PROT_READ | PROT_WRITE,
+                    MAP_ANONYMOUS | MAP_SHARED, -1, 0);
+  if (ptr == MAP_FAILED)
+    {
+      printf ("error: could not map %zu bytes: %m\n", sizeof (*state));
+      exit (1);
+    }
+  /* Zero-initialization of the struct is sufficient.  */
+  state = ptr;
+}
+
+void
+support_record_failure (void)
+{
+  if (state == NULL)
+    {
+      write_message
+        ("error: support_record_failure called without initialization\n");
+      _exit (1);
+    }
+  /* Relaxed MO is sufficient because we are only interested in the
+     values themselves, in isolation.  */
+  __atomic_store_n (&state->failed, 1, __ATOMIC_RELEASE);
+  __atomic_add_fetch (&state->counter, 1, __ATOMIC_RELEASE);
+}
+
+int
+support_report_failure (int status)
+{
+  if (state == NULL)
+    {
+      write_message
+        ("error: support_report_failure called without initialization\n");
+      return 1;
+    }
+
+  /* Relaxed MO is sufficient because acquire test result reporting
+     assumes that exiting from the main thread happens before the
+     error reporting via support_record_failure, which requires some
+     form of external synchronization.  */
+  bool failed = __atomic_load_n (&state->failed, __ATOMIC_RELAXED);
+  if (failed)
+    printf ("error: %u test failures\n",
+            __atomic_load_n (&state->counter, __ATOMIC_RELAXED));
+
+  if ((status == 0 || status == EXIT_UNSUPPORTED) && failed)
+    /* If we have a recorded failure, it overrides a non-failure
+       report from the test function.  */
+    status = 1;
+  return status;
+}
+
+void
+support_record_failure_reset (void)
+{
+  /* Only used for testing the test framework, with external
+     synchronization, but use release MO for consistency.  */
+  __atomic_store_n (&state->failed, 0, __ATOMIC_RELAXED);
+  __atomic_add_fetch (&state->counter, 0, __ATOMIC_RELAXED);
+}