1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "base/sys_info.h"
6
7 #include <sys/param.h>
8 #include <sys/shm.h>
9 #include <sys/sysctl.h>
10
11 #include "base/logging.h"
12
13 namespace {
14
AmountOfMemory(int pages_name)15 int64 AmountOfMemory(int pages_name) {
16 long pages = sysconf(pages_name);
17 long page_size = sysconf(_SC_PAGESIZE);
18 if (pages == -1 || page_size == -1) {
19 NOTREACHED();
20 return 0;
21 }
22 return static_cast<int64>(pages) * page_size;
23 }
24
25 } // namespace
26
27 namespace base {
28
29 // static
NumberOfProcessors()30 int SysInfo::NumberOfProcessors() {
31 int mib[] = { CTL_HW, HW_NCPU };
32 int ncpu;
33 size_t size = sizeof(ncpu);
34 if (sysctl(mib, arraysize(mib), &ncpu, &size, NULL, 0) < 0) {
35 NOTREACHED();
36 return 1;
37 }
38 return ncpu;
39 }
40
41 // static
AmountOfPhysicalMemory()42 int64 SysInfo::AmountOfPhysicalMemory() {
43 return AmountOfMemory(_SC_PHYS_PAGES);
44 }
45
46 // static
AmountOfAvailablePhysicalMemory()47 int64 SysInfo::AmountOfAvailablePhysicalMemory() {
48 return AmountOfMemory(_SC_AVPHYS_PAGES);
49 }
50
51 // static
MaxSharedMemorySize()52 size_t SysInfo::MaxSharedMemorySize() {
53 int mib[] = { CTL_KERN, KERN_SHMINFO, KERN_SHMINFO_SHMMAX };
54 size_t limit;
55 size_t size = sizeof(limit);
56 if (sysctl(mib, arraysize(mib), &limit, &size, NULL, 0) < 0) {
57 NOTREACHED();
58 return 0;
59 }
60 return limit;
61 }
62
63 // static
CPUModelName()64 std::string SysInfo::CPUModelName() {
65 int mib[] = { CTL_HW, HW_MODEL };
66 char name[256];
67 size_t len = arraysize(name);
68 if (sysctl(mib, arraysize(mib), name, &len, NULL, 0) < 0) {
69 NOTREACHED();
70 return std::string();
71 }
72 return name;
73 }
74
75 } // namespace base
76