File: seccomp_support_detector.cc

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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "chrome/browser/android/seccomp_support_detector.h"

#include <stdio.h>
#include <sys/utsname.h>

#include "base/compiler_specific.h"
#include "base/cpu.h"
#include "base/metrics/histogram_functions.h"
#include "base/metrics/histogram_macros.h"
#include "build/build_config.h"

namespace {

// Reports the kernel version obtained from uname.
void ReportKernelVersion() {
  // This method will report the kernel major and minor versions by
  // taking the lower 16 bits of each version number and combining
  // the two into a 32-bit number.

  utsname uts;
  if (uname(&uts) == 0) {
    int major, minor;
    if (UNSAFE_TODO(sscanf(uts.release, "%d.%d", &major, &minor)) == 2) {
      int version = ((major & 0xFFFF) << 16) | (minor & 0xFFFF);
      base::UmaHistogramSparse("Android.KernelVersion", version);
    }
  }
}

}  // namespace

void ReportSeccompSupport() {
  ReportKernelVersion();
}