ambd/main.cpp

   1 /*
   2 Copyright (C) 2012 Intel Corporation
   3
   4 This library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Lesser General Public
   6 License as published by the Free Software Foundation; either
   7 version 2.1 of the License, or (at your option) any later version.
   8
   9 This library is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Lesser General Public License for more details.
  13
  14 You should have received a copy of the GNU Lesser General Public
  15 License along with this library; if not, write to the Free Software
  16 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  17 */
  18
  19 #include <iostream>
  20 #include <string>
  21 #include <getopt.h>
  22 #include <unistd.h>
  23 #include <sys/types.h>
  24 #include <sys/stat.h>
  25 #include <pwd.h>
  26 #include <grp.h>
  27 #include <errno.h>
  28 #include <fcntl.h>
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <signal.h>
  32 #include <string.h>
  33 #include <stdexcept>
  34 #include <glib-object.h>
  35
  36 #ifdef USE_QT_CORE
  37
  38 #include <QCoreApplication>
  39
  40 #else
  41
  42 #include <glib.h>
  43
  44 #endif
  45
  46 #include "pluginloader.h"
  47 #include "core.h"
  48 #include <debugout.h>
  49
  50 using namespace std;
  51
  52 #ifndef USE_QT_CORE
  53
  54 GMainLoop* mainLoop = nullptr;
  55
  56 #endif
  57
  58 void interrupt(int sign)
  59 {
  60         signal(sign, SIG_IGN);
  61         cout<<"Signal caught. Exiting gracefully.\n"<<endl;
  62
  63 #ifdef USE_QT_CORE
  64         QCoreApplication::exit(0);
  65 #else
  66         g_main_loop_quit(mainLoop);
  67         exit(0);
  68 #endif
  69 }
  70
  71 void daemonize();
  72
  73 void printhelp(const char *argv0);
  74
  75 static const char shortopts[] = "hvDc:d:";
  76
  77 static const struct option longopts[] = {
  78         { "help", no_argument, NULL, 'h' }, ///< Print the help text
  79         { "version", no_argument, NULL, 'v' }, ///< Print the version text
  80         { "daemonise", no_argument, NULL, 'D' }, ///< Daemonise
  81         { "config", required_argument, NULL, 'c' },
  82         { "debug", required_argument, NULL, 'd' },
  83         { NULL, 0, NULL, 0 } ///< End
  84 };
  85
  86 int main(int argc, char **argv)
  87 {
  88
  89         bool isdeamonize=false;
  90         int optc;
  91         int th = 0;
  92         string config="/etc/ambd/config";
  93
  94         while ((optc = getopt_long (argc, argv, shortopts, longopts, NULL)) != -1)
  95         {
  96                 switch (optc)
  97                 {
  98                         case 'D':
  99                                 isdeamonize = true;
 100                                 break;
 101
 102                         case 'v':
 103                                 cout<<PROJECT_NAME<<endl;
 104                                 cout<<"Version: "<<PROJECT_VERSION<<endl;
 105                                 return (0);
 106                                 break;
 107                         case 'c':
 108                                 cout<<"Config: "<<optarg<<endl;
 109                                 config=optarg;
 110                                 break;
 111                         case 'd':
 112                                 th = atoi(optarg);
 113                                 DebugOut::setDebugThreshhold(th);
 114                                 break;
 115                         default:
 116                                 cerr<<"Unknown option "<<optc<<endl;
 117                                 printhelp(argv[0]);
 118                                 return (0);
 119                                 break;
 120                 }
 121         }
 122
 123         if(isdeamonize)
 124                 daemonize();
 125
 126
 127 #ifdef USE_QT_CORE
 128
 129         QCoreApplication app(argc,argv);
 130
 131 #else
 132
 133         mainLoop = g_main_loop_new(NULL, false);
 134
 135 #endif
 136
 137         g_type_init();
 138
 139         /* Register signal handler */
 140         signal(SIGINT, interrupt);
 141         signal(SIGTERM, interrupt);
 142
 143         PluginLoader loader(config, new Core());
 144
 145         if(!loader.sources().size())
 146         {
 147                 throw std::runtime_error("No sources present. aborting");
 148         }
 149
 150
 151
 152 #ifdef USE_QT_CORE
 153
 154         app.exec();
 155
 156 #else
 157
 158         g_main_loop_run(mainLoop);
 159
 160 #endif
 161
 162         return 0;
 163 }
 164
 165 void daemonize()
 166 {
 167         int i=0;
 168         if(getppid() == 1)
 169         {
 170                 return; // already a daemon
 171         }
 172         if((i = fork()) < 0)
 173         {
 174                 fprintf(stderr, "%s:%s(%d) - fork error: %s", __FILE__, __FUNCTION__, __LINE__, strerror(errno));
 175                 exit(1);
 176         }
 177         if(i > 0)
 178         {
 179                 exit(0);        // parent exits
 180         }       // child (daemon) continues
 181         setsid();       // obtain a new process group
 182         for(i = getdtablesize(); i >= 0; --i)
 183         {
 184                 close(i);       // close all descriptors
 185         }
 186         {       // handle standard I/O
 187         i = open("/dev/null", O_RDWR);
 188         dup(i);
 189         dup(i);
 190         }
 191         // first instance continues
 192 }
 193
 194 void printhelp(const char *argv0)
 195 {
 196         printf("Usage: %s [args]\n"
 197                    "   [-D|--daemonise]\n"
 198                    "   [-v|--version]\n"
 199                    "   [-c|--config </path/to/config> \t]\n"
 200                    "   [-d|--debug <level (0-5)>\t]\n"
 201                    "   [-h|--help]\n"
 202                    , argv0);
 203 }
 204