Linux sandbox: Provide AssertSingleThreaded() helper

sandbox/linux/bpf_dsl/bpf_dsl_more_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 "sandbox/linux/bpf_dsl/bpf_dsl.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <pthread.h>
 #include <sched.h>
@@ skipping 25 matching lines @@
 #include "sandbox/linux/bpf_dsl/policy.h"
 #include "sandbox/linux/seccomp-bpf/bpf_tests.h"
 #include "sandbox/linux/seccomp-bpf/die.h"
 #include "sandbox/linux/seccomp-bpf/errorcode.h"
 #include "sandbox/linux/seccomp-bpf/linux_seccomp.h"
 #include "sandbox/linux/seccomp-bpf/sandbox_bpf.h"
 #include "sandbox/linux/seccomp-bpf/syscall.h"
 #include "sandbox/linux/seccomp-bpf/trap.h"
 #include "sandbox/linux/services/linux_syscalls.h"
 #include "sandbox/linux/services/syscall_wrappers.h"
+#include "sandbox/linux/services/thread_helpers.h"
 #include "sandbox/linux/syscall_broker/broker_file_permission.h"
 #include "sandbox/linux/syscall_broker/broker_process.h"
 #include "sandbox/linux/tests/scoped_temporary_file.h"
 #include "sandbox/linux/tests/unit_tests.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 // Workaround for Android's prctl.h file.
 #ifndef PR_GET_ENDIAN
 #define PR_GET_ENDIAN 19
 #endif
@@ skipping 2245 matching lines @@
 
   ResultExpr EvaluateSyscall(int sysno) const override { return Allow(); }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AllowAllPolicy);
 };
 
 SANDBOX_DEATH_TEST(
     SandboxBPF,
     StartMultiThreadedAsSingleThreaded,
-    DEATH_MESSAGE("Cannot start sandbox; process is already multi-threaded")) {
+    DEATH_MESSAGE(
+        ThreadHelpers::GetAssertSingleThreadedErrorMessageForTests())) {
   base::Thread thread("sandbox.linux.StartMultiThreadedAsSingleThreaded");
   BPF_ASSERT(thread.Start());
 
   SandboxBPF sandbox(new AllowAllPolicy());
   BPF_ASSERT(!sandbox.StartSandbox(SandboxBPF::SeccompLevel::SINGLE_THREADED));
 }
 
 // http://crbug.com/407357
 #if !defined(THREAD_SANITIZER)
 SANDBOX_DEATH_TEST(
@@ skipping 66 matching lines @@
   BPF_ASSERT_EQ(ENOSYS, errno);
 
   BPF_ASSERT_EQ(-1, syscall(__NR_setgid, 300));
   BPF_ASSERT_EQ(EPERM, errno);
 }
 
 }  // namespace
 
 }  // namespace bpf_dsl
 }  // namespace sandbox