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// Copyright (c) 2009 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 "chrome/browser/process_info_snapshot.h"
#include <iostream>
#include <sstream>
#include "base/logging.h"
#include "base/string_util.h"
#include "base/thread.h"
// Implementation for the Mac; calls '/bin/ps' for information when
// |Sample()| is called.
// Default constructor.
ProcessInfoSnapshot::ProcessInfoSnapshot() { }
// Destructor: just call |Reset()| to release everything.
ProcessInfoSnapshot::~ProcessInfoSnapshot() {
Reset();
}
const size_t ProcessInfoSnapshot::kMaxPidListSize = 1000;
// Capture the information by calling '/bin/ps'.
// Note: we ignore the "tsiz" (text size) display option of ps because it's
// always zero (tested on 10.5 and 10.6).
bool ProcessInfoSnapshot::Sample(std::vector<base::ProcessId> pid_list) {
const char* kPsPathName = "/bin/ps";
Reset();
// Nothing to do if no PIDs given.
if (pid_list.size() == 0)
return true;
if (pid_list.size() > kMaxPidListSize) {
// The spec says |pid_list| *must* not have more than this many entries.
NOTREACHED();
return false;
}
std::vector<std::string> argv;
argv.push_back(kPsPathName);
// Get PID, PPID, (real) UID, effective UID, resident set size, virtual memory
// size, and command.
argv.push_back("-o");
argv.push_back("pid=,ppid=,ruid=,uid=,rss=,vsz=,comm=");
// Only display the specified PIDs.
for (std::vector<base::ProcessId>::iterator it = pid_list.begin();
it != pid_list.end(); ++it) {
argv.push_back("-p");
argv.push_back(Int64ToString(static_cast<int64>(*it)));
}
std::string output;
CommandLine command_line(argv);
// Limit output read to a megabyte for safety.
if (!base::GetAppOutputRestricted(command_line, &output, 1024 * 1024)) {
LOG(ERROR) << "Failure running " << kPsPathName << " to acquire data.";
return false;
}
std::istringstream in(output, std::istringstream::in);
std::string line;
// Process lines until done.
while (true) {
ProcInfoEntry proc_info;
// The format is as specified above to ps (see ps(1)):
// "-o pid=,ppid=,ruid=,uid=,rss=,vsz=,comm=".
// Try to read the PID; if we get it, we should be able to get the rest of
// the line.
in >> proc_info.pid;
if (in.eof())
break;
in >> proc_info.ppid;
in >> proc_info.uid;
in >> proc_info.euid;
in >> proc_info.rss;
in >> proc_info.vsize;
in.ignore(1, ' '); // Eat the space.
std::getline(in, proc_info.command); // Get the rest of the line.
if (!in.good()) {
LOG(ERROR) << "Error parsing output from " << kPsPathName << ".";
return false;
}
// Make sure the new PID isn't already in our list.
if (proc_info_entries_.find(proc_info.pid) != proc_info_entries_.end()) {
LOG(ERROR) << "Duplicate PID in output from " << kPsPathName << ".";
return false;
}
if (!proc_info.pid || ! proc_info.vsize) {
LOG(WARNING) << "Invalid data from " << kPsPathName << ".";
return false;
}
// Record the process information.
proc_info_entries_[proc_info.pid] = proc_info;
}
return true;
}
// Clear all the stored information.
void ProcessInfoSnapshot::Reset() {
proc_info_entries_.clear();
}
bool ProcessInfoSnapshot::GetProcInfo(int pid,
ProcInfoEntry* proc_info) const {
std::map<int,ProcInfoEntry>::const_iterator it = proc_info_entries_.find(pid);
if (it == proc_info_entries_.end())
return false;
*proc_info = it->second;
return true;
}
bool ProcessInfoSnapshot::GetCommittedKBytesOfPID(
int pid,
base::CommittedKBytes* usage) const {
// Try to avoid crashing on a bug; stats aren't usually so crucial.
if (!usage) {
NOTREACHED();
return false;
}
// Failure of |GetProcInfo()| is "normal", due to racing.
ProcInfoEntry proc_info;
if (!GetProcInfo(pid, &proc_info)) {
usage->priv = 0;
usage->mapped = 0;
usage->image = 0;
return false;
}
usage->priv = proc_info.vsize;
usage->mapped = 0;
usage->image = 0;
return true;
}
bool ProcessInfoSnapshot::GetWorkingSetKBytesOfPID(
int pid,
base::WorkingSetKBytes* ws_usage) const {
// Try to avoid crashing on a bug; stats aren't usually so crucial.
if (!ws_usage) {
NOTREACHED();
return false;
}
// Failure of |GetProcInfo()| is "normal", due to racing.
ProcInfoEntry proc_info;
if (!GetProcInfo(pid, &proc_info)) {
ws_usage->priv = 0;
ws_usage->shareable = 0;
ws_usage->shared = 0;
return false;
}
ws_usage->priv = 0;
ws_usage->shareable = proc_info.rss;
ws_usage->shared = 0;
return true;
}
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