/*
* Copyright (c) 2007 Michal Konopa
* Copyright (c) 2007 Martin Jelen
* Copyright (c) 2007 Peter Majer
* 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.
*/
/** @addtogroup libc
* @{
*/
/**
* @file file.c
* @brief The user library for working with the file system
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <async.h>
#include <ipc/services.h>
#include <ipc/ipc.h>
#include <sys/mman.h>
#include <io/file.h>
#include <bool.h>
#include <err.h>
#include <align.h>
#include "../../../fs/dir.h"
#include "../../../share/message.h"
#include "../../../share/shared_proto.h"
#define CONNECT_SLEEP_INTERVAL 10000
#define CONNECT_SLEEP_TIMEOUT 100000
/**
*
*/
static int fs_phone;
static file_t *file_connect();
static int file_disconnect(file_t *file);
/**
* Connect to the FS task and share memory with it for further data and
* extended memory transfers
*/
file_t *file_connect() {
file_t *result;
size_t size;
void *share = NULL;
int retval;
size = ALIGN_UP(BLOCK_SIZE * sizeof(char), PAGE_SIZE);
share = mmap(share, size, AS_AREA_READ | AS_AREA_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
if ((int) share < 0) {
f_err = F_MMAP_FAILURE;
return NULL;
}
retval = async_req_2(fs_phone, FS_NEW_CONSUMER, task_get_id(), 0, NULL, NULL);
if (retval < 0) {
f_err = F_COMM_FAILURE;
return NULL;
}
int flags = 0;
flags = AS_AREA_READ | AS_AREA_WRITE;
retval = async_req_3(fs_phone, IPC_M_AS_AREA_SEND, (uintptr_t)share, size, flags, NULL, NULL, NULL);
if (retval < 0) {
f_err = F_COMM_FAILURE;
return NULL;
}
/* Allocating structure for extended message. */
message_params_t
*params
= malloc(sizeof(message_params_t
)); memset((void*) params
, 0, sizeof(message_params_t
));
result
= malloc(sizeof(file_t
)); result->share = share;
result->size = size;
result->params = params;
f_err = F_OK;
return result;
}
/**
* Disconnect from the FS task, unsharing memory and freeing the file data structure
*/
int file_disconnect(file_t *file) {
int retval = send_request(fs_phone, FS_DROP_CONSUMER, file->params, file->share);
if (retval < 0)
return -1;
/* Unmapping share area. */
retval = munmap(file->share, file->size);
if (retval < 0)
return -1;
file->size = ALIGN_UP(BLOCK_SIZE * sizeof(char), PAGE_SIZE);
file->share = mmap(file->share, file->size, AS_AREA_READ | AS_AREA_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
if ((int) (file->share) < 0)
return -1;
f_err = F_OK;
return F_OK;
}
/**
* List contents of the current directory
*/
dir_item_t *ls(unsigned int *length) {
dir_item_t *result;
unsigned short entries_num;
file_t *shared_file = file_connect();
if (shared_file == NULL)
return NULL;
/* We want lookup our work directory. */
retval = send_request(fs_phone, FS_DSUM, shared_file->params, shared_file->share);
if (retval < 0) {
f_err = F_READ_ERROR;
return NULL;
}
entries_num = retval;
*length = entries_num;
result
= malloc(entries_num
* sizeof (dir_item_t
));
int entry;
for (entry = 0; entry < entries_num; entry++) {
shared_file->params->entry_number = entry;
retval = send_request(fs_phone, FS_READENTRY, shared_file->params, shared_file->share);
if (retval < 0) {
f_err = F_READ_ERROR;
return NULL;
}
memcpy(&(result
[entry
].
inode_num), shared_file
->share
, sizeof(unsigned short)); memcpy(result
[entry
].
name, (void *)(shared_file
->share
+sizeof(unsigned short)), retval
-sizeof(unsigned short));
/* Do not show empty entries. */
if (!result[entry].inode_num)
continue;
}
return result;
}
/**
* Change the current working directory for the task
*/
int chdir(char * new_dir)
{
file_t *shared_file = file_connect();
if (shared_file == NULL) {
f_err = F_READ_ERROR;
return F_READ_ERROR;
}
memcpy(shared_file
->params
->fname
, new_dir
, 30);
int retval = send_request(fs_phone, FS_CHDIR, shared_file->params, shared_file->share);
if (retval < 0) {
f_err = F_READ_ERROR;
return F_READ_ERROR;
}
retval = file_disconnect(shared_file);
f_err = F_OK;
return F_OK;
}
/**
* Open a file for reading and/or writing
*/
file_t
*fopen(char *name
, int mode
){
file_t *file = file_connect();
/* We want to work with the specified file. */
memcpy(file
->params
->fname
, name
, 30);
int retval = send_request(fs_phone, FS_OPEN, file->params, file->share);
if (retval < 0)
return NULL;
file->handle = retval;
return file;
}
/**
* Read status information about a file
*/
int fstat(file_t *file)
{
memcpy(file
->params
->fname
, file
->base_info.
name, 30); file->params->fd = file->handle;
int retval = send_request(fs_phone, FS_FSTAT, file->params, file->share);
if (retval < 0)
return -1;
memcpy((void *)(&file
->stat
), file
->share
, sizeof(stat_t
));
f_err = F_OK;
return F_OK;
}
/**
* Read data from a file
*/
int fread(file_t
*file
, void* buffer
, unsigned int size
) {
file->params->nbytes = size;
int retval = send_request(fs_phone, FS_READ, file->params, file->share);
if (retval < 0)
return -1;
f_err = F_OK;
return F_OK;
}
/**
* Seek to a position within a file
*/
int fseek(file_t
*file
, int offset
, int whence
) {
file->params->offset = 0;
file->params->whence = 0; /* from beginning of the file */
int retval = send_request(fs_phone, FS_SEEK, file->params, file->share);
if (retval < 0)
return -1;
f_err = F_OK;
return F_OK;
}
/**
* Close a file
*/
{
int retval = send_request(fs_phone, FS_CLOSE, file->params, file->share);
if (retval < 0)
return -1;
if (file != NULL)
file_disconnect(file);
f_err = F_OK;
return F_OK;
}
/**
*@}
*/