erkeyb-client.c

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/*
 * File Name: erkeyb-client.c
 */

/*
 * This file is part of erkeyb.
 *
 * erkeyb 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.
 *
 * erkeyb 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/>.
 */

/**
 * Copyright (C) 2009 iRex Technologies B.V.
 * All rights reserved.
 */

//----------------------------------------------------------------------------
// Include Files
//----------------------------------------------------------------------------

// system includes
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>

// gtk
#include <glib.h>
#include <gtk/gtk.h>

// local include files, between " "
#include "config.h"
#include "erkeyb-client.h"

// logging
#include "logging.h"

//----------------------------------------------------------------------------
// MACROS and definitions
//----------------------------------------------------------------------------

#define HOST "127.0.0.1"
#define PORT "60666"

//----------------------------------------------------------------------------
// Type Declarations
//----------------------------------------------------------------------------

typedef struct _keyb_client keyb_client;

struct _keyb_client {
    struct addrinfo hints;
    int sfd;
    GIOChannel* chan;
    gboolean is_closed;
};

//----------------------------------------------------------------------------
// Static Variables
//----------------------------------------------------------------------------

static keyb_client g_keyb_client;

//----------------------------------------------------------------------------
// Functions Prototypes  (keyboard)
//----------------------------------------------------------------------------


//============================================================================
// Functions Implementation (keyboard)
//============================================================================


int erkeyb_client_init(void) 
{
    DBG_ENTRY;
    struct addrinfo *result, *rp;
    int s;

    /* Obtain address(es) matching host/port */

    memset(&g_keyb_client, 0x0, sizeof(keyb_client));
    memset(&g_keyb_client.hints, 0x0, sizeof(struct addrinfo));

    g_keyb_client.hints.ai_family = AF_INET;    /* Allow IPv4 */
    g_keyb_client.hints.ai_socktype = SOCK_DGRAM; /* Datagram socket */
    g_keyb_client.hints.ai_flags = 0;
    g_keyb_client.hints.ai_protocol = 0;          /* Any protocol */

    s = getaddrinfo(HOST, PORT, &g_keyb_client.hints, &result);

    if (s != 0) {
        ERR("getaddrinfo: %s\n", gai_strerror(s));
        return 1;
    }

    for (rp = result; rp != NULL; rp = rp->ai_next) {
        g_keyb_client.sfd = socket(rp->ai_family, rp->ai_socktype,
                rp->ai_protocol);
        if (g_keyb_client.sfd == -1)
            continue;

        if (connect(g_keyb_client.sfd, rp->ai_addr, rp->ai_addrlen) != -1)
            break;                  /* Success */

        close(g_keyb_client.sfd);
    }

    if (rp == NULL) {               /* No address succeeded */
        ERR("Could not connect\n");
        freeaddrinfo(result);           /* No longer needed */
        return 1;
    }

    freeaddrinfo(result);           /* No longer needed */


    /* we have a connection */
    /* so we can setup a GIOChannel */

    g_keyb_client.chan = NULL ;
    g_keyb_client.chan = g_io_channel_unix_new( g_keyb_client.sfd);
    DBG_ASSERT( g_keyb_client.chan != NULL  ) ;

    g_io_channel_set_encoding(g_keyb_client.chan, NULL, NULL  );

    g_keyb_client.is_closed = FALSE;

    DBG_EXIT;
    return 0;
}

void erkeyb_client_show(void) 
{
    DBG_ENTRY;
    
    if ( g_keyb_client.is_closed == TRUE )
    {
        erkeyb_client_init();
    }

    g_io_channel_write_chars(g_keyb_client.chan, "keyboard-show\n", -1, NULL, NULL );
    g_io_channel_flush(g_keyb_client.chan, NULL );

    DBG_EXIT;
}

void erkeyb_client_hide(void)
{
    DBG_ENTRY;

    if ( g_keyb_client.is_closed == TRUE )
    {
        erkeyb_client_init();
    }

    g_io_channel_write_chars(g_keyb_client.chan, "keyboard-hide\n", -1, NULL, NULL );
    g_io_channel_flush(g_keyb_client.chan, NULL );

    DBG_EXIT;
}

void erkeyb_client_term(void) 
{
    DBG_ENTRY;

    if ( g_keyb_client.is_closed == FALSE )
    {
        g_io_channel_write_chars(g_keyb_client.chan, "keyboard-hide\n", -1, NULL, NULL );
        g_io_channel_flush(g_keyb_client.chan, NULL );

        g_io_channel_shutdown(g_keyb_client.chan, FALSE, NULL);
        g_io_channel_unref(g_keyb_client.chan);
        g_keyb_client.chan = NULL ;
        close(g_keyb_client.sfd);
        g_keyb_client.sfd = -1;
        g_keyb_client.is_closed = TRUE;
    }

    DBG_EXIT;
}