Subversion Repositories HelenOS

/* Sending extended well formed messages to FS over

 * standard HelenOS message agrs and over shared buffer.

 */

/* Methods:

 * send_request:    forms and sends extended message to FS

 * unpack_message:  unpacks message to given message_params_t* structure

 */

#include <async.h>

#include <task.h>

#include "../fs/fs.h"

#include "message.h"

int send_request(int phoneid, ipcarg_t method, message_params_t *params, void *shared_buffer);

void unpack_message(message_params_t *message, ipc_call_t m_input, void *shared_buffer);

/* This method should be used by all callers of FS. Candidate at library function. */  

int send_request(int phoneid, ipcarg_t method, message_params_t *params, void *shared_buffer)

{

    int retval, shift;

    size_t size;

    size = sizeof(message_params_t);

    memset((void *)shared_buffer, 0, size);

    /* Setting 'buffered' parameters. */

    memcpy((void* )shared_buffer, (void *)(&params->nbytes), sizeof(unsigned int));

    shift = sizeof(unsigned int);

    memcpy((void *)(shared_buffer + shift), (void *)(&params->offset), sizeof(offset_t));

    shift += sizeof(offset_t);

    memcpy((void *)(shared_buffer + shift), (void *)(&params->fname), DIRSIZEX);

    params->fname[DIRSIZEX-1] = '\0';

    shift += DIRSIZEX * sizeof(char);

    memcpy((void *)(shared_buffer + shift), (void *)(&params->entry_number), sizeof(int));

    /* 'Most used' parameters will be pass in standart message parameters. */

    retval = async_req_3(phoneid, method, task_get_id(), params->fd, params->whence, NULL, NULL, NULL);

    return retval; 

}

/* Will be used by FS to unpacking incoming extended message. */

void unpack_message(message_params_t *message, ipc_call_t m_input, void *shared_buffer)

{

    int shift;

    /* Core message parameters. */

    message->id_task = IPC_GET_ARG1(m_input);

    message->fd = IPC_GET_ARG2(m_input);

    message->whence = IPC_GET_ARG3(m_input);

    /* Buffered parameters - extended. */

    memcpy((void *)&message->nbytes, (void *)(shared_buffer), sizeof(unsigned int));

    shift = sizeof(unsigned int);

    memcpy((void *)(&message->offset), (void *)(shared_buffer + shift), sizeof(offset_t));

    shift += sizeof(offset_t);

    memcpy((void *)(&message->fname), (void *)(shared_buffer + shift), DIRSIZEX);

    shift += DIRSIZEX * sizeof(char);

    memcpy((void *)(&message->entry_number), (void *)(shared_buffer + shift), sizeof(int));

}