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fileutils.cpp

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    fileutils.cpp 3.44 KiB
    /*
     *  Copyright (C) 2011-2012 Savoir-Faire Linux Inc.
     *  Author: Rafaël Carré <rafael.carre@savoirfairelinux.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 3 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., 675 Mass Ave, Cambridge, MA 02139, USA.
     *
     *  Additional permission under GNU GPL version 3 section 7:
     *
     *  If you modify this program, or any covered work, by linking or
     *  combining it with the OpenSSL project's OpenSSL library (or a
     *  modified version of that library), containing parts covered by the
     *  terms of the OpenSSL or SSLeay licenses, Savoir-Faire Linux Inc.
     *  grants you additional permission to convey the resulting work.
     *  Corresponding Source for a non-source form of such a combination
     *  shall include the source code for the parts of OpenSSL used as well
     *  as that of the covered work.
     */
    
    #include <libgen.h>
    #include <dirent.h>
    #include <sys/stat.h>
    #include <fstream>
    #include <cstdlib>
    #include <signal.h>
    #include <string>
    #include <sstream>
    #include <iostream>
    #include <unistd.h>
    #include "fileutils.h"
    
    namespace fileutils {
    // returns true if directory exists
    bool check_dir(const char *path)
    {
        DIR *dir = opendir(path);
    
        if (!dir) { // doesn't exist
            if (mkdir(path, 0755) != 0) {   // couldn't create the dir
                perror(path);
                return false;
            }
        } else
            closedir(dir);
    
        return true;
    }
    
    static char *program_dir = NULL;
    
    void set_program_dir(char *program_path)
    {
        program_dir = dirname(program_path);
    }
    
    const char *get_program_dir()
    {
        return program_dir;
    }
    
    //TODO it is faking this, implement proper system 
    const char *get_data_dir()
    {
        std::string path = std::string(get_program_dir()) + "/../../share/sflphone/ringtones/";
        return path.c_str();
    }
    
    bool create_pidfile()
    {
        std::string xdg_env(XDG_CACHE_HOME);
        std::string path = (not xdg_env.empty()) ? xdg_env : std::string(HOMEDIR) + DIR_SEPARATOR_STR ".cache/";
    
        if (!check_dir(path.c_str()))
            return false;
    
        path += "sflphone";
    
        if (!check_dir(path.c_str()))
            return false;
    
        std::string pidfile = path + "/" PIDFILE;
        std::ifstream is(pidfile.c_str());
    
        if (is) {
            // PID file exists. Check if the former process is still alive or
            // not. If alive, give user a hint.
            int oldPid;
            is >> oldPid;
    
            if (kill(oldPid, 0) == 0) {
                // Use cerr because logging has not been initialized
                std::cerr << "There is already a sflphoned daemon running in " <<
                    "the system. Starting Failed." << std::endl;
                return false;
            }
        }
    
        // write pid file
        std::ofstream os(pidfile.c_str());
    
        if (!os) {
            perror(pidfile.c_str());
            return false;
        } else {
            os << getpid();
        }
    
        return true;
    }
    
    bool isDirectoryWritable(const std::string &directory)
    {
        return access(directory.c_str(), W_OK) == 0;
    }
    }