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kbdd.c

/********************************************************************* 
 * Kbdd - simple per-window-keyboard layout library and deamon 
 * Copyright (C) 2010  Alexander V Vershilov and collaborators
 *
 * 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, see <http://www.gnu.org/licenses/>.
 **********************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <sys/stat.h>
#include <getopt.h>

#include <X11/Xlib.h>
#include <errno.h>

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#ifdef ENABLE_DBUS
#include <pthread.h>
#include <glib.h>
#include <glib/gthread.h>
#include "dbus/m-kbdd-service.h"
#include "dbus/kbdd-service-glue.h"
#endif

#include "libkbdd.h"
#include "common-defs.h"

#define OPEN_MAX_GUESS 256

static int flag_nodaemon;

// prototypes >>>
void main_help();
void main_version();
// <<< prototypes

#ifdef ENABLE_DBUS
MKbddService * service = NULL;
DBusGConnection * bus  = NULL;
DBusGProxy * proxy     = NULL;
#endif

int main_fork()
{
    pid_t pid,sid;
    int i,stdioFD,numFiles;

    pid = fork();

    switch ( pid )
    {
        case 0:
            break;
        case -1:
            fprintf(stderr,"Error: initial fork failed: %s\n",strerror(errno));
            exit ( EXIT_FAILURE );
            break;
        default:
            exit ( EXIT_SUCCESS );
    }

    sid = setsid();
    if ( sid < 0 ) 
    {
        fprintf(stderr,"Error: setsid failed: %s\n", strerror(errno));
        exit( EXIT_FAILURE );
    }
    printf("kbdd pid: %i\n",sid);

    numFiles = sysconf(_SC_OPEN_MAX);
    if (numFiles<0)
        numFiles=OPEN_MAX_GUESS;

    for (i=numFiles-1;i>=0;i--)
        close(i);
    
    umask(0);

    stdioFD = open("/dev/null",O_RDWR);
    if ( ( dup(stdioFD) == -1 ) 
            || ( dup(stdioFD) == -1) ) 
    {
        fprintf(stderr, "Error: unable to dup /dev/null\n");
        exit(EXIT_FAILURE);
    }
    return 0;
}

#ifdef ENABLE_DBUS
int dbus_init( ) {

    char * request_ret = NULL;
    unsigned int result;
    GError * error = NULL;

    /* Initialize the GType/GObject system */
    g_type_init();


    g_print(":main Connecting to the Session D-Bus.\n");
    bus = dbus_g_bus_get(DBUS_BUS_SESSION, &error);
    if ( error != NULL ) 
    {
        fprintf(stderr,"Couldn't connect to session bus: %s\n",error->message);
        exit (EXIT_FAILURE);
    }

    printf(":main Regiresting the well-known name (%s)\n", M_DBUS_KBDD_SERVICE);

    /**
     * In order to register a well-known name, we need to use the 
     * "RequestMethod" of the /org/freedesktop/DBus interface. Each
     * bus provides an object that will implement this interface
     *
     */
    proxy = dbus_g_proxy_new_for_name(bus,
                DBUS_SERVICE_DBUS, DBUS_PATH_DBUS, DBUS_INTERFACE_DBUS);
    if ( proxy == NULL) 
    {
        fprintf(stderr,"Failed to get a proxy for D-Bus\n");
    }

    //if (! org_freedesktop_DBus_request_name( proxy, M_DBUS_KBDD_SERVICE,
    //            DBUS_NAME_FLAG_DO_NOT_QUEUE, &request_ret, &error) )
    if (! dbus_g_proxy_call( proxy, 
                "RequestName",
                &error,
                G_TYPE_STRING, M_DBUS_KBDD_SERVICE,
                G_TYPE_UINT, 0,
                G_TYPE_INVALID, 
                G_TYPE_UINT, &result,
                G_TYPE_INVALID))
    {
        fprintf(stderr, "Unable to register service: %s", error->message);
        exit (EXIT_FAILURE);
    }
    printf(":main RequestName returned %s.\n", request_ret);
    if ( result != 1 ) 
    {
        fprintf(stderr,"Failed to get the primary well-known name.\n");
        exit (EXIT_FAILURE);
    }

    printf(":main Creating one MKbddService Object\n");

    service = g_object_new(M_TYPE_KBDD_SERVICE, NULL);
    if (service == NULL) 
    {
        fprintf(stderr,"Failed to create one KbddService instance\n");
        exit (EXIT_FAILURE);
    }

    g_print(":main Registering project to D-Bus.\n");

    dbus_g_object_type_install_info (M_TYPE_KBDD_SERVICE, &dbus_glib_m_kbdd_service_object_info);
    dbus_g_connection_register_g_object(bus, M_DBUS_KBDD_SERVICE_PATH, G_OBJECT(service));

    g_print("Ready to serve requests\n");
    return 1;
}


void onLayoutUpdate(uint32_t layout, void * obj) 
{
    dbg(" EVENT LAYOUT CHANGED %u", layout);
    char * layout_name = NULL;
    int result =  kbdd_get_layout_name(layout, &layout_name);
    if ( ! result ) layout_name = NULL;
    dbg(" Keyboard layout %s", layout_name);
    m_kbdd_service_update_layout((MKbddService *)obj, layout, layout_name);
    if (layout_name)
      free(layout_name);
}
#endif

int main(int argc, char * argv[])
{
    dbg("kbdd starting WITH debug");
    
    /**
     * get options part
     *  -h / --help     -- help message
     *  -v / --version  -- version message
     *  -n / --nodaemon -- start in normal mode
     */
    {
        static int flag_help;
        static int flag_version;
        int c;
        static struct option long_options[] = 
        {
            { "nodaemon", no_argument, &flag_nodaemon, 1 },
            { "help",     no_argument, &flag_help,   1 },
            { "nodaemon", no_argument, 0, 'n' },
            { "help",     no_argument, 0, 'h' },
            { "version",  no_argument, &flag_version, 1},
            { 0, 0, 0, 0}
        };

        while (1) 
        {

            int option_index = 0;
            c = getopt_long(argc, argv, "nhv",
                    long_options, &option_index);

            if ( c == -1 )
                break;

            switch ( c ) 
            {
                case 0:
                    if ( long_options[option_index].flag != 0 ) 
                        break;
                case 'n':
                    flag_nodaemon = 1;
                    break;
                case 'h':
                    flag_help = 1;
                    break;
                case 'v':
                    flag_version=1;
                    break;
                default:
                    main_help();
                    exit( EXIT_FAILURE );
            }
        }

        if ( flag_version ) {
            main_version();
            exit( EXIT_SUCCESS );
        }

        if ( flag_help ) {
            main_help();
            exit( EXIT_FAILURE );
        }
    }


    if ( ! flag_nodaemon )
    {
#ifndef DAEMON
        main_fork();
#else
        if ( daemon(0,0) != 0 ) 
            perror("Failed to daemonize.\n");
#endif
    }

#ifdef ENABLE_DBUS
    g_type_init();
    GMainLoop * mainloop = NULL;
    mainloop = g_main_loop_new(NULL,FALSE);
    if ( !g_thread_supported () ) {
        dbg("gthread not supported  - initializing");
        g_thread_init ( NULL );
    }
    dbus_g_thread_init ();
    dbus_init();
#endif

    kbdd_init();
#ifndef ENABLE_DBUS
    kbdd_default_loop( NULL );
#else
    kbdd_setupUpdateCallback(onLayoutUpdate, service);
    g_timeout_add(100, kbdd_default_iter, mainloop);
    g_main_loop_run(mainloop);
#endif
    kbdd_free();
    return EXIT_SUCCESS;
}

void main_help()
{
    printf("KBDD very simple layout switcher\n");
    printf("Usage: \n");
    printf("\tkbdd [-n]                   - start kbdd\n");
    printf("\tkbdd [-h] [-v] [--version]  - print info message\nOptions:\n");
    printf("\t -n --nodaemon - start in nodaemon mode\n");
    printf("\t -h --help     - print this help\n");
    printf("\t -v --version  - show version\n");
}

void main_version()
{
    printf("kbdd " VERSION ", see -h/--help for brief info\n");
}

//vim:ts=4:expandtab 

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