// 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/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 (sscanf(uts.release, "%d.%d", &major, &minor) == 2) {
int version = ((major & 0xFFFF) << 16) | (minor & 0xFFFF);
base::UmaHistogramSparse("Android.KernelVersion", version);
}
}
}
// Per the comment in base/cpu.cc's ParseProcCpu(), unfortunately there is not
// a universally reliable way to examine the CPU part information for all
// cores, so the sampling effect of data collection via UMA will have to
// suffice.
void ReportArmCpu() {
#if defined(ARCH_CPU_ARM_FAMILY)
base::CPU cpu;
// Compose the implementer (8 bits) and the part number (12 bits) into a
// single 20-bit number that can be recorded via UMA.
uint32_t composed = cpu.implementer();
composed <<= 12;
composed |= cpu.part_number();
base::UmaHistogramSparse("Android.ArmCpuPart", composed);
#endif
}
} // namespace
void ReportSeccompSupport() {
ReportKernelVersion();
ReportArmCpu();
}