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// Copyright (c) 2011 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 "base/sys_info.h"
#include <errno.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <sys/param.h>
#include <sys/resource.h>
#include <sys/utsname.h>
#include <unistd.h>
#include "base/files/file_util.h"
#include "base/lazy_instance.h"
#include "base/logging.h"
#include "base/strings/utf_string_conversions.h"
#include "base/sys_info_internal.h"
#include "base/threading/thread_restrictions.h"
#include "build/build_config.h"
#if defined(OS_ANDROID)
#include <sys/vfs.h>
#define statvfs statfs // Android uses a statvfs-like statfs struct and call.
#else
#include <sys/statvfs.h>
#endif
#if defined(OS_LINUX)
#include <linux/magic.h>
#include <sys/vfs.h>
#endif
namespace {
#if !defined(OS_OPENBSD)
int NumberOfProcessors() {
// sysconf returns the number of "logical" (not "physical") processors on both
// Mac and Linux. So we get the number of max available "logical" processors.
//
// Note that the number of "currently online" processors may be fewer than the
// returned value of NumberOfProcessors(). On some platforms, the kernel may
// make some processors offline intermittently, to save power when system
// loading is low.
//
// One common use case that needs to know the processor count is to create
// optimal number of threads for optimization. It should make plan according
// to the number of "max available" processors instead of "currently online"
// ones. The kernel should be smart enough to make all processors online when
// it has sufficient number of threads waiting to run.
long res = sysconf(_SC_NPROCESSORS_CONF);
if (res == -1) {
NOTREACHED();
return 1;
}
return static_cast<int>(res);
}
base::LazyInstance<
base::internal::LazySysInfoValue<int, NumberOfProcessors> >::Leaky
g_lazy_number_of_processors = LAZY_INSTANCE_INITIALIZER;
#endif
int64_t AmountOfVirtualMemory() {
struct rlimit limit;
int result = getrlimit(RLIMIT_DATA, &limit);
if (result != 0) {
NOTREACHED();
return 0;
}
return limit.rlim_cur == RLIM_INFINITY ? 0 : limit.rlim_cur;
}
base::LazyInstance<
base::internal::LazySysInfoValue<int64_t, AmountOfVirtualMemory>>::Leaky
g_lazy_virtual_memory = LAZY_INSTANCE_INITIALIZER;
#if defined(OS_LINUX)
bool IsStatsZeroIfUnlimited(const base::FilePath& path) {
struct statfs stats;
if (HANDLE_EINTR(statfs(path.value().c_str(), &stats)) != 0)
return false;
switch (stats.f_type) {
case TMPFS_MAGIC:
case HUGETLBFS_MAGIC:
case RAMFS_MAGIC:
return true;
}
return false;
}
#endif
bool GetDiskSpaceInfo(const base::FilePath& path,
int64_t* available_bytes,
int64_t* total_bytes) {
struct statvfs stats;
if (HANDLE_EINTR(statvfs(path.value().c_str(), &stats)) != 0)
return false;
#if defined(OS_LINUX)
const bool zero_size_means_unlimited =
stats.f_blocks == 0 && IsStatsZeroIfUnlimited(path);
#else
const bool zero_size_means_unlimited = false;
#endif
if (available_bytes) {
*available_bytes =
zero_size_means_unlimited
? std::numeric_limits<int64_t>::max()
: static_cast<int64_t>(stats.f_bavail) * stats.f_frsize;
}
if (total_bytes) {
*total_bytes = zero_size_means_unlimited
? std::numeric_limits<int64_t>::max()
: static_cast<int64_t>(stats.f_blocks) * stats.f_frsize;
}
return true;
}
} // namespace
namespace base {
#if !defined(OS_OPENBSD)
int SysInfo::NumberOfProcessors() {
return g_lazy_number_of_processors.Get().value();
}
#endif
// static
int64_t SysInfo::AmountOfVirtualMemory() {
return g_lazy_virtual_memory.Get().value();
}
// static
int64_t SysInfo::AmountOfFreeDiskSpace(const FilePath& path) {
base::ThreadRestrictions::AssertIOAllowed();
int64_t available;
if (!GetDiskSpaceInfo(path, &available, nullptr))
return -1;
return available;
}
// static
int64_t SysInfo::AmountOfTotalDiskSpace(const FilePath& path) {
base::ThreadRestrictions::AssertIOAllowed();
int64_t total;
if (!GetDiskSpaceInfo(path, nullptr, &total))
return -1;
return total;
}
#if !defined(OS_MACOSX) && !defined(OS_ANDROID)
// static
std::string SysInfo::OperatingSystemName() {
struct utsname info;
if (uname(&info) < 0) {
NOTREACHED();
return std::string();
}
return std::string(info.sysname);
}
#endif
#if !defined(OS_MACOSX) && !defined(OS_ANDROID)
// static
std::string SysInfo::OperatingSystemVersion() {
struct utsname info;
if (uname(&info) < 0) {
NOTREACHED();
return std::string();
}
return std::string(info.release);
}
#endif
// static
std::string SysInfo::OperatingSystemArchitecture() {
struct utsname info;
if (uname(&info) < 0) {
NOTREACHED();
return std::string();
}
std::string arch(info.machine);
if (arch == "i386" || arch == "i486" || arch == "i586" || arch == "i686") {
arch = "x86";
} else if (arch == "amd64") {
arch = "x86_64";
}
return arch;
}
// static
size_t SysInfo::VMAllocationGranularity() {
return getpagesize();
}
} // namespace base
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