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// Copyright 2015 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.
#ifndef CHROME_BROWSER_ANDROID_SECCOMP_SUPPORT_DETECTOR_H_
#define CHROME_BROWSER_ANDROID_SECCOMP_SUPPORT_DETECTOR_H_
#include "base/compiler_specific.h"
#include "content/public/browser/utility_process_host_client.h"
// This class is used to report via UMA the Android kernel version and
// level of seccomp-bpf support. The kernel version is read from the blocking
// thread pool, while seccomp support is tested in a utility process, in case
// the probing causes a crash.
class SeccompSupportDetector : public content::UtilityProcessHostClient {
public:
// Starts the detection process. This should be called once per browser
// session. This is safe to call from any thread.
static void StartDetection();
private:
SeccompSupportDetector();
~SeccompSupportDetector() override;
// Called on the blocking thread pool. This reads the utsname and records
// the kernel version.
void DetectKernelVersion();
// Called on the IO thread. This starts a utility process to detect seccomp.
void DetectSeccomp();
// UtilityProcessHostClient:
void OnProcessCrashed(int exit_code) override;
bool OnMessageReceived(const IPC::Message& message) override;
// OnDetectPrctl is always received before OnDetectSyscall.
void OnDetectPrctl(bool prctl_supported);
void OnDetectSyscall(bool syscall_supported);
// Whether OnDetectPrctl was received.
bool prctl_detected_;
DISALLOW_COPY_AND_ASSIGN(SeccompSupportDetector);
};
#endif // CHROME_BROWSER_ANDROID_SECCOMP_SUPPORT_DETECTOR_H_
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