s3fs-fuse/src/fdcache_fdinfo.cpp

/*
 * s3fs - FUSE-based file system backed by Amazon S3
 *
 * Copyright(C) 2007 Takeshi Nakatani <ggtakec.com>
 *
 * 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.
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

#include <cstdio>
#include <cstdlib>
#include <algorithm>

#include "common.h"
#include "s3fs.h"
#include "fdcache_fdinfo.h"
#include "fdcache_pseudofd.h"
#include "autolock.h"

//------------------------------------------------
// PseudoFdInfo methods
//------------------------------------------------
PseudoFdInfo::PseudoFdInfo(int fd, int open_flags) : pseudo_fd(-1), physical_fd(fd), flags(0) //, is_lock_init(false)
{
    if(-1 != physical_fd){
        pseudo_fd = PseudoFdManager::Get();
        flags     = open_flags;
    }
}

PseudoFdInfo::~PseudoFdInfo()
{
    Clear();
}

bool PseudoFdInfo::Clear()
{
    if(-1 != pseudo_fd){
        PseudoFdManager::Release(pseudo_fd);
    }
    pseudo_fd   = -1;
    physical_fd = -1;

    return true;
}

bool PseudoFdInfo::Set(int fd, int open_flags)
{
    if(-1 == fd){
        return false;
    }
    Clear();
    physical_fd = fd;
    pseudo_fd   = PseudoFdManager::Get();
    flags       = open_flags;

    return true;
}

bool PseudoFdInfo::Writable() const
{
    if(-1 == pseudo_fd){
        return false;
    }
    if(0 == (flags & (O_WRONLY | O_RDWR))){
        return false;
    }
    return true;
}

bool PseudoFdInfo::Readable() const
{
    if(-1 == pseudo_fd){
        return false;
    }
    // O_RDONLY is 0x00, it means any pattern is readable.
    return true;
}

/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: expandtab sw=4 ts=4 fdm=marker
* vim<600: expandtab sw=4 ts=4
*/