Linux sandbox unit test: log BPF support

sandbox/linux/seccomp-bpf/sandbox_bpf_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <ostream>
+
 #include "sandbox/linux/seccomp-bpf/sandbox_bpf.h"
 #include "sandbox/linux/seccomp-bpf/verifier.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using namespace playground2;
 
 namespace {
 
 const int kExpectedReturnValue = 42;
 
 TEST(SandboxBpf, CallSupports) {
   // We check that we don't crash, but it's ok if the kernel doesn't
   // support it.
-  Sandbox::supportsSeccompSandbox(-1);
+  bool seccomp_bpf_supported =
+      Sandbox::supportsSeccompSandbox(-1) == Sandbox::STATUS_AVAILABLE;
+  // We want to log whether or not seccomp BPF is actually supported
+  // since actual test coverage depends on it.
+  RecordProperty("SeccompBPFSupported",
+                 seccomp_bpf_supported ? "true." : "false.");
+  std::cout << "Seccomp BPF supported: "
+            << (seccomp_bpf_supported ? "true." : "false.")
+            << "\n";
 }
 
 TEST(SandboxBpf, CallSupportsTwice) {
   Sandbox::supportsSeccompSandbox(-1);
   Sandbox::supportsSeccompSandbox(-1);
 }
 
 __attribute__((noreturn)) void DoCrash() {
   // Cause a #PF. This only works if we assume that we have the default
   // SIGSEGV handler.
@@ skipping 222 matching lines @@
     }
   }
   ExitGroup(kExpectedReturnValue);
 }
 
 TEST(SandboxBpf, SyntheticPolicy) {
   TryPolicyInProcess(SyntheticPolicy, SyntheticProcess);
 }
 
 } // namespace