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Viewing changes to src/Utility/AppLock.vala

  • Committer: Tony George
  • Date: 2016-10-16 13:42:12 UTC
  • Revision ID: tony.george.kol@gmail.com-20161016134212-ibjsptmgbha7a2mw
Fixed scheduled backups; Initialize display for the scheduled cron task;

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src/Utility/AppLock.vala
 
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/*
 
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 * AppLock.vala
 
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 *
 
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 * Copyright 2016 Tony George <teejeetech@gmail.com>
 
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 *
 
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 * This program is free software; you can redistribute it and/or modify
 
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 * it under the terms of the GNU General Public License as published by
 
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 * the Free Software Foundation; either version 2 of the License, or
 
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 * (at your option) any later version.
 
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 *
 
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 * This program is distributed in the hope that it will be useful,
 
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
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 * GNU General Public License for more details.
 
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 *
 
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 * You should have received a copy of the GNU General Public License
 
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 * along with this program; if not, write to the Free Software
 
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 
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 * MA 02110-1301, USA.
 
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 *
 
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 *
 
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 */
 
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using TeeJee.Logging;
 
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using TeeJee.FileSystem;
 
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using TeeJee.ProcessHelper;
 
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using TeeJee.Misc;
 
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public class AppLock : GLib.Object {
 
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        public string lock_file = "";
 
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        public string lock_message = "";
 
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        public bool create(string app_name, string message){
 
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                var lock_dir = "/var/run/lock/%s".printf(app_name);
 
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                dir_create(lock_dir);
 
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                lock_file = path_combine(lock_dir, "lock");
 
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                try{
 
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                        var file = File.new_for_path(lock_file);
 
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                        if (file.query_exists()) {
 
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                                string txt = file_read(lock_file);
 
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                                string process_id = txt.split(";")[0].strip();
 
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                                lock_message = txt.split(";")[1].strip();
 
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                                long pid = long.parse(process_id);
 
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                                if (process_is_running(pid)){
 
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                                        log_msg(_("Another instance of this application is running")
 
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                                                + " (PID=%ld)".printf(pid));
 
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                                        return false;
 
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                                }
 
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                                else{
 
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                                        log_msg(_("[Warning] Deleted invalid lock"));
 
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                                        file.delete();
 
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                                        write_lock_file(message);
 
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                                        return true;
 
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                                }
 
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                        }
 
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                        else{
 
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                                write_lock_file(message);
 
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                                return true;
 
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                        }
 
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                }
 
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                catch (Error e) {
 
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                        log_error (e.message);
 
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                        return false;
 
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                }
 
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        }
 
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        private void write_lock_file(string message){
 
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                string current_pid = ((long) Posix.getpid()).to_string();
 
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                file_write(lock_file, "%s;%s".printf(current_pid, message));
 
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        }
 
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        public void remove(){
 
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                try{
 
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                        var file = File.new_for_path (lock_file);
 
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                        if (file.query_exists()) {
 
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                                file.delete();
 
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                        }
 
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                }
 
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                catch (Error e) {
 
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                        log_error (e.message);
 
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                }
 
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        }
 
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}