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// processinfo.cpp
/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kControl
#include "mongo/platform/basic.h"
#include "mongo/base/init.h"
#include "mongo/util/processinfo.h"
#include <boost/filesystem/operations.hpp>
#include <boost/filesystem/path.hpp>
#include <fstream>
#include <iostream>
#include "mongo/util/log.h"
using namespace std;
namespace mongo {
class PidFileWiper {
public:
~PidFileWiper() {
if (path.empty()) {
return;
}
ofstream out(path.c_str(), ios_base::out);
out.close();
}
bool write(const boost::filesystem::path& p) {
path = p;
ofstream out(path.c_str(), ios_base::out);
out << ProcessId::getCurrent() << endl;
if (!out.good()) {
auto errAndStr = errnoAndDescription();
if (errAndStr.first == 0) {
log() << "ERROR: Cannot write pid file to " << path.string()
<< ": Unable to determine OS error";
} else {
log() << "ERROR: Cannot write pid file to " << path.string() << ": "
<< errAndStr.second;
}
} else {
boost::system::error_code ec;
boost::filesystem::permissions(
path,
boost::filesystem::owner_read | boost::filesystem::owner_write |
boost::filesystem::group_read | boost::filesystem::others_read,
ec);
if (ec) {
log() << "Could not set permissions on pid file " << path.string() << ": "
<< ec.message();
return false;
}
}
return out.good();
}
private:
boost::filesystem::path path;
} pidFileWiper;
bool writePidFile(const string& path) {
return pidFileWiper.write(path);
}
} // namespace mongo
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