FileSystem.cpp

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/*
// $Id: //open/dev/fennel/common/FileSystem.cpp#10 $
// Fennel is a library of data storage and processing components.
// Copyright (C) 2005-2009 The Eigenbase Project
// Copyright (C) 2005-2009 SQLstream, Inc.
// Copyright (C) 2005-2009 LucidEra, Inc.
// Portions Copyright (C) 1999-2009 John V. Sichi
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 of the License, or (at your option)
// any later version approved by The Eigenbase Project.
//
// 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

// FIXME:  port
#define __EXTENSIONS__

#include "fennel/common/CommonPreamble.h"
#include "fennel/common/FileSystem.h"

#ifdef __MSVC__
#include <io.h>
#define S_IRUSR S_IREAD
#define S_IWUSR S_IWRITE
typedef int mode_t;
#else
#include <unistd.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#ifdef __MSVC__
#include "fennel/common/FennelResource.h"
#else
#include <sys/statvfs.h>
#endif
#include <fcntl.h>
#include "fennel/common/SysCallExcn.h"
#include <sstream>

FENNEL_BEGIN_CPPFILE("$Id: //open/dev/fennel/common/FileSystem.cpp#10 $");

void FileSystem::remove(char const *fileName)
{
    if (doesFileExist(fileName)) {
        setFileAttributes(fileName,0);
        if (::unlink(fileName)) {
            std::ostringstream oss;
            oss << "Failed to remove file " << fileName;
            throw SysCallExcn(oss.str());
        }
    }
}

bool FileSystem::doesFileExist(char const *filename)
{
    return !::access(filename,0);
}

bool FileSystem::setFileAttributes(char const *filename,bool readOnly)
{
    mode_t mode = S_IRUSR;
    if (!readOnly) {
        mode |= S_IWUSR;
    }
    return ::chmod(filename,mode) ? 0 : 1;
}

void FileSystem::getDiskFreeSpace(char const *path, FileSize &availableSpace)
{
#ifdef __MSVC__
    throw FennelExcn(FennelResource::instance().unsupportedOperation("statvfs"));
#else
    struct statvfs buf;
    int rc = statvfs(path, &buf);
    if (rc == -1) {
        throw SysCallExcn("statvfs call failed");
    }
    availableSpace = buf.f_bsize * buf.f_bavail;
#endif
}

FENNEL_END_CPPFILE("$Id: //open/dev/fennel/common/FileSystem.cpp#10 $");

// End FileSystem.cpp

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