/usr/include/mongo/util/logfile.h is in mongodb-dev 1:2.4.9-1ubuntu2.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 | // @file logfile.h simple file log writing / journaling
/**
* Copyright (C) 2010 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
namespace mongo {
class LogFile {
public:
/** create the file and open. must not already exist.
throws UserAssertion on i/o error
*/
LogFile(const std::string& name, bool readwrite = false);
/** closes */
~LogFile();
/** append to file. does not return until sync'd. uses direct i/o when possible.
throws UserAssertion on an i/o error
note direct i/o may have alignment requirements
*/
void synchronousAppend(const void *buf, size_t len);
/** write at specified offset. must be aligned. noreturn until physically written. thread safe */
void writeAt(unsigned long long offset, const void *_bug, size_t _len);
void readAt(unsigned long long offset, void *_buf, size_t _len);
const string _name;
void truncate(); // Removes extra data after current position
private:
#if defined(_WIN32)
typedef HANDLE fd_type;
#else
typedef int fd_type;
#endif
fd_type _fd;
bool _direct; // are we using direct I/O
};
}
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