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Side by Side Diff: extensions/browser/api/system_cpu/cpu_info_provider_linux.cc

Issue 389633002: Move system.* family of APIs to extensions/ (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: No ash/ dependency anymore Created 6 years, 3 months ago
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1 // Copyright 2014 The Chromium Authors. All rights reserved. 1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #include "chrome/browser/extensions/api/system_cpu/cpu_info_provider.h" 5 #include "extensions/browser/api/system_cpu/cpu_info_provider.h"
6 6
7 #include <cstdio> 7 #include <cstdio>
8 #include <sstream> 8 #include <sstream>
9 9
10 #include "base/files/file_util.h" 10 #include "base/files/file_util.h"
11 #include "base/format_macros.h" 11 #include "base/format_macros.h"
12 12
13 namespace extensions { 13 namespace extensions {
14 14
15 namespace { 15 namespace {
16 16
17 const char kProcStat[] = "/proc/stat"; 17 const char kProcStat[] = "/proc/stat";
18 18
19 } // namespace 19 } // namespace
20 20
21 bool CpuInfoProvider::QueryCpuTimePerProcessor( 21 bool CpuInfoProvider::QueryCpuTimePerProcessor(
22 std::vector<linked_ptr<api::system_cpu::ProcessorInfo> >* infos) { 22 std::vector<linked_ptr<core_api::system_cpu::ProcessorInfo> >* infos) {
23 DCHECK(infos); 23 DCHECK(infos);
24 24
25 // WARNING: this method may return incomplete data because some processors may 25 // WARNING: this method may return incomplete data because some processors may
26 // be brought offline at runtime. /proc/stat does not report statistics of 26 // be brought offline at runtime. /proc/stat does not report statistics of
27 // offline processors. CPU usages of offline processors will be filled with 27 // offline processors. CPU usages of offline processors will be filled with
28 // zeros. 28 // zeros.
29 // 29 //
30 // An example of output of /proc/stat when processor 0 and 3 are online, but 30 // An example of output of /proc/stat when processor 0 and 3 are online, but
31 // processor 1 and 2 are offline: 31 // processor 1 and 2 are offline:
32 // 32 //
33 // cpu 145292 20018 83444 1485410 995 44 3578 0 0 0 33 // cpu 145292 20018 83444 1485410 995 44 3578 0 0 0
34 // cpu0 138060 19947 78350 1479514 570 44 3576 0 0 0 34 // cpu0 138060 19947 78350 1479514 570 44 3576 0 0 0
35 // cpu3 2033 32 1075 1400 52 0 1 0 0 0 35 // cpu3 2033 32 1075 1400 52 0 1 0 0 0
36 std::string contents; 36 std::string contents;
37 if (!base::ReadFileToString(base::FilePath(kProcStat), &contents)) 37 if (!base::ReadFileToString(base::FilePath(kProcStat), &contents))
38 return false; 38 return false;
39 39
40 std::istringstream iss(contents); 40 std::istringstream iss(contents);
41 std::string line; 41 std::string line;
42 42
43 // Skip the first line because it is just an aggregated number of 43 // Skip the first line because it is just an aggregated number of
44 // all cpuN lines. 44 // all cpuN lines.
45 std::getline(iss, line); 45 std::getline(iss, line);
46 while (std::getline(iss, line)) { 46 while (std::getline(iss, line)) {
47 if (line.compare(0, 3, "cpu") != 0) 47 if (line.compare(0, 3, "cpu") != 0)
48 continue; 48 continue;
49 49
50 uint64 user = 0, nice = 0, sys = 0, idle = 0; 50 uint64 user = 0, nice = 0, sys = 0, idle = 0;
51 uint32 pindex = 0; 51 uint32 pindex = 0;
52 int vals = sscanf(line.c_str(), 52 int vals =
53 "cpu%" PRIu32 " %" PRIu64 " %" PRIu64 " %" PRIu64 " %" PRIu64, 53 sscanf(line.c_str(),
54 &pindex, &user, &nice, &sys, &idle); 54 "cpu%" PRIu32 " %" PRIu64 " %" PRIu64 " %" PRIu64 " %" PRIu64,
55 &pindex,
56 &user,
57 &nice,
58 &sys,
59 &idle);
55 if (vals != 5 || pindex >= infos->size()) { 60 if (vals != 5 || pindex >= infos->size()) {
56 NOTREACHED(); 61 NOTREACHED();
57 return false; 62 return false;
58 } 63 }
59 64
60 infos->at(pindex)->usage.kernel = static_cast<double>(sys); 65 infos->at(pindex)->usage.kernel = static_cast<double>(sys);
61 infos->at(pindex)->usage.user = static_cast<double>(user + nice); 66 infos->at(pindex)->usage.user = static_cast<double>(user + nice);
62 infos->at(pindex)->usage.idle = static_cast<double>(idle); 67 infos->at(pindex)->usage.idle = static_cast<double>(idle);
63 infos->at(pindex)->usage.total = static_cast<double>(sys + user + 68 infos->at(pindex)->usage.total =
64 nice + idle); 69 static_cast<double>(sys + user + nice + idle);
65 } 70 }
66 71
67 return true; 72 return true;
68 } 73 }
69 74
70 } // namespace extensions 75 } // namespace extensions
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