source: mainline/uspace/srv/devmap/devmap.c@ 2f3a594

/*
 * Copyright (c) 2007 Josef Cejka
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/**
 * @defgroup devmap Device mapper.
 * @brief       HelenOS device mapper.
 * @{
 */ 

/** @file
 */

#include <ipc/services.h>
#include <ipc/ns.h>
#include <async.h>
#include <stdio.h>
#include <errno.h>
#include <bool.h>
#include <libadt/list.h>
#include <futex.h>

#include "devmap.h"

LIST_INITIALIZE(device_list);

atomic_t device_list_futex = FUTEX_INITIALIZER;

/** Initialize device mapper. 
 *
 *
 */
static int devmap_init()
{
        /* */

        return EOK;
}

static int devmap_register()
{
        ipc_callid_t callid2;
        size_t size;
        char buffer[DEVMAP_NAME_MAXLEN + 1];
        ipc_callid_t callid;
        ipc_call_t call;
        int retval;
        
        if (ipc_data_receive(&callid, &call, NULL, &size) != 0) {
        //      retval = 
        }

        if (size > DEVMAP_NAME_MAXLEN) {
                retval = ELIMIT;
        } else {
                ipc_data_deliver(callid2, &call, buffer, size);
                buffer[DEVMAP_NAME_MAXLEN] = 0;
        }
        return EOK;
}

static int devmap_unregister()
{
        return EOK;
}

static int devmap_forward(int handle, ipc_call_t *call, ipc_callid_t callid)
{
        link_t *item;
        ipcarg_t phone;
        devmap_device_t *dev;

        /* FIXME: add futex */
        futex_down(&device_list_futex);

        item = (&device_list)->next;

        while (item != &device_list) {

                dev = list_get_instance(item, devmap_device_t, list);
                if (dev->handle == handle) {
                        break;
                }
                item = item->next;
        }

        if (item == &device_list) {
                return ENOENT;
        }

        dev = list_get_instance(item, devmap_device_t, list);
        phone = dev->phone;

        futex_up(&device_list_futex);
        
        return ipc_forward_fast(callid, phone, 0, 0);
}

static int devmap_get_handle()
{
        return EOK;
}

/** Function for handling connections to devmap 
 *
 */
static void
devmap_client_connection(ipc_callid_t iid, ipc_call_t *icall)
{
        ipc_callid_t callid;
        ipc_call_t call;
        int retval;
        bool cont = true;

        printf("DevMap: new connection.");

        ipc_answer_fast(iid, EOK, 0, 0); /* Accept connection */

        while (cont) {
                callid = async_get_call(&call);

                switch (IPC_GET_METHOD(call)) {
                case IPC_M_PHONE_HUNGUP:
                                /* TODO: if its a device connection, remove it from table */
                        devmap_unregister();
                        printf("DevMap: connection hung up.");
                        cont = false;
                        continue; /* Exit thread */

                case DEVMAP_REGISTER:
                        
                        if ((retval = devmap_register()) != EOK) {
                                cont = false;
                        }
                        break;
                case DEVMAP_UNREGISTER:
                        /* TODO: remove device (if registred) */
                        retval = devmap_unregister();
                        cont = false;
                        break;
                case DEVMAP_CONNECT_TO_DEVICE:
                        retval = devmap_forward(IPC_GET_ARG1(call), &call, callid);
                        cont = false;
                        break;
                case DEVMAP_GET_HANDLE:
                        
                        break;
                default:
                        retval = ENOENT;
                }
                ipc_answer_fast(callid, retval, 0, 0);
        }
                
        printf("DevMap: connection closed.");
        return;
}


int main(int argc, char *argv[])
{

        ipcarg_t phonead;

        printf("DevMap: HelenOS device mapper.\n");

        if (devmap_init() != 0) {
                printf("Error while initializing DevMap service.");
                return -1;
        }

                /* Set a handler of incomming connections */
        async_set_client_connection(devmap_client_connection);

                /* Register device mapper at naming service */
        if (ipc_connect_to_me(PHONE_NS, SERVICE_DEVMAP, 0, &phonead) != 0) 
                return -1;
        
        async_manager();
        /* Never reached */
        return 0;
}

/** 
 * @}
 */