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  → /branches/ @ 2393

  → /branches/ @ 2394

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Ignore whitespace Rev 2393 → Rev 2394

/branches/fs/uspace/share/message.c
0,0 → 1,65
/* 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));
}

/branches/fs/uspace/share/message.h
0,0 → 1,22
/* Extended message structure, which is used for communicating between FS
* and its consuments.
*/
#ifndef _MESSAGE_H
#define _MESSAGE_H
/* Declaration of the extended message structure as it is in the call and buffer. */
typedef struct {
ipcarg_t id_task; /* id of currently consument */
ipcarg_t fd; /* file descriptor */
ipcarg_t whence; /* start position of SEEK */
/* Parameters which are present only in the buffer. */
unsigned int nbytes; /* number of bytes which will be read */
offset_t offset; /* offset of SEEK */
char fname[DIRSIZEX]; /* file name */
int entry_number; /* number of directory entry */
} message_params_t;
#endif /* _MESSAGE_H */