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CFS implementation over the xmem module

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adamdunkels 2007-03-21 23:15:31 +00:00
parent 224634b88d
commit 897bd980e1
2 changed files with 201 additions and 0 deletions
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156
core/cfs/cfs-xmem.c Normal file
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/*
* Copyright (c) 2004, Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE OR CONTRIBUTORS 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.
*
* This file is part of the Contiki operating system.
*
* Author: Adam Dunkels <adam@sics.se>
*
* $Id: cfs-xmem.c,v 1.1 2007/03/21 23:15:31 adamdunkels Exp $
*/
#include "contiki.h"
#include "cfs/cfs.h"
#include "cfs/cfs-service.h"
#include "dev/xmem.h"
struct filestate {
int flag;
#define FLAG_FILE_CLOSED 0
#define FLAG_FILE_OPEN 1
off_t fileptr;
};
static struct filestate file;
#ifdef CFS_XMEM_CONF_OFFSET
#define CFS_XMEM_OFFSET CFS_XMEM_CONF_OFFSET
#else
#define CFS_XMEM_OFFSET 0
#endif
/*---------------------------------------------------------------------------*/
static int
s_open(const char *n, int f)
{
if(file.flag == FLAG_FILE_CLOSED) {
file.flag = FLAG_FILE_OPEN;
file.fileptr = 0;
return 1;
} else {
return -1;
}
}
/*---------------------------------------------------------------------------*/
static void
s_close(int f)
{
file.flag = FLAG_FILE_CLOSED;
}
/*---------------------------------------------------------------------------*/
static int
s_read(int f, char *buf, unsigned int len)
{
if(f == 1) {
xmem_pread(buf, len, CFS_XMEM_OFFSET + file.fileptr);
file.fileptr += len;
return len;
} else {
return -1;
}
}
/*---------------------------------------------------------------------------*/
static int
s_write(int f, char *buf, unsigned int len)
{
if(f == 1) {
xmem_pwrite(buf, len, CFS_XMEM_OFFSET + file.fileptr);
file.fileptr += len;
return len;
} else {
return -1;
}
}
/*---------------------------------------------------------------------------*/
static int
s_seek(int f, unsigned int o)
{
if(f == 1) {
file.fileptr = o;
return o;
} else {
return -1;
}
}
/*---------------------------------------------------------------------------*/
static int
s_opendir(struct cfs_dir *p, const char *n)
{
return 1;
}
/*---------------------------------------------------------------------------*/
static int
s_readdir(struct cfs_dir *p, struct cfs_dirent *e)
{
return 1;
}
/*---------------------------------------------------------------------------*/
static int
s_closedir(struct cfs_dir *p)
{
return 1;
}
/*---------------------------------------------------------------------------*/
/*
* Service registration code follows.
*/
SERVICE(cfs_xmem_service, cfs_service,
{ s_open, s_close, s_read, s_write, s_seek,
s_opendir, s_readdir, s_closedir });
PROCESS(cfs_xmem_process, "CFS XMEM service");
PROCESS_THREAD(cfs_xmem_process, ev, data)
{
PROCESS_BEGIN();
SERVICE_REGISTER(cfs_xmem_service);
PROCESS_WAIT_EVENT_UNTIL(ev == PROCESS_EVENT_SERVICE_REMOVED ||
ev == PROCESS_EVENT_EXIT);
SERVICE_REMOVE(cfs_xmem_service);
PROCESS_END();
}
/*---------------------------------------------------------------------------*/
void
cfs_xmem_init(void)
{
process_start(&cfs_xmem_process, NULL);
}
/*---------------------------------------------------------------------------*/

45
core/cfs/cfs-xmem.h Normal file
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/*
* Copyright (c) 2004, Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE OR CONTRIBUTORS 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.
*
* This file is part of the Contiki operating system.
*
* Author: Adam Dunkels <adam@sics.se>
*
* $Id: cfs-xmem.h,v 1.1 2007/03/21 23:15:31 adamdunkels Exp $
*/
#ifndef __CFS_XMEM_H__
#define __CFS_XMEM_H__
#include "contiki.h"
#include "cfs/cfs.h"
PROCESS_NAME(cfs_xmem_process);
void cfs_xmem_init(void);
#endif /* __CFS_XMEM_H__ */