/*
* IMFS Device Node Handlers
*
* This file contains the set of handlers used to map operations on
* IMFS device nodes onto calls to the RTEMS Classic API IO Manager.
*
* COPYRIGHT (c) 1989-1998.
* On-Line Applications Research Corporation (OAR).
* Copyright assigned to U.S. Government, 1994.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* $Id$
*/
#include <rtems.h>
#include <rtems/libio.h>
#include "libio_.h"
#include "imfs.h"
/*
* device_open
*
* This handler maps an open() operation onto rtems_io_open().
*/
int device_open(
rtems_libio_t *iop,
const char *pathname,
unsigned32 flag,
unsigned32 mode
)
{
rtems_libio_open_close_args_t args;
rtems_status_code status;
IMFS_jnode_t *the_jnode;
the_jnode = iop->file_info;
args.iop = iop;
args.flags = iop->flags;
args.mode = mode;
status = rtems_io_open(
the_jnode->info.device.major,
the_jnode->info.device.minor,
(void *) &args
);
if ( status )
return RTEMS_UNSATISFIED;
return 0;
}
/*
* device_close
*
* This handler maps a close() operation onto rtems_io_close().
*/
int device_close(
rtems_libio_t *iop
)
{
rtems_libio_open_close_args_t args;
rtems_status_code status;
IMFS_jnode_t *the_jnode;
the_jnode = iop->file_info;
args.iop = iop;
args.flags = 0;
args.mode = 0;
status = rtems_io_close(
the_jnode->info.device.major,
the_jnode->info.device.minor,
(void *) &args
);
if ( status )
return RTEMS_UNSATISFIED;
return 0;
}
/*
* device_read
*
* This handler maps a read() operation onto rtems_io_read().
*/
int device_read(
rtems_libio_t *iop,
void *buffer,
unsigned32 count
)
{
rtems_libio_rw_args_t args;
rtems_status_code status;
IMFS_jnode_t *the_jnode;
the_jnode = iop->file_info;
args.iop = iop;
args.offset = iop->offset;
args.buffer = buffer;
args.count = count;
args.flags = iop->flags;
args.bytes_moved = 0;
status = rtems_io_read(
the_jnode->info.device.major,
the_jnode->info.device.minor,
(void *) &args
);
if ( status )
return -1;
return args.bytes_moved;
}
/*
* device_write
*
* This handler maps a write() operation onto rtems_io_write().
*/
int device_write(
rtems_libio_t *iop,
const void *buffer,
unsigned32 count
)
{
rtems_libio_rw_args_t args;
rtems_status_code status;
IMFS_jnode_t *the_jnode;
the_jnode = iop->file_info;
args.iop = iop;
args.offset = iop->offset;
args.buffer = (void *) buffer;
args.count = count;
args.flags = iop->flags;
args.bytes_moved = 0;
status = rtems_io_write(
the_jnode->info.device.major,
the_jnode->info.device.minor,
(void *) &args
);
if ( status )
return -1;
return args.bytes_moved;
}
/*
* device_ioctl
*
* This handler maps an ioctl() operation onto rtems_io_ioctl().
*/
int device_ioctl(
rtems_libio_t *iop,
unsigned32 command,
void *buffer
)
{
rtems_libio_ioctl_args_t args;
rtems_status_code status;
IMFS_jnode_t *the_jnode;
args.iop = iop;
args.command = command;
args.buffer = buffer;
the_jnode = iop->file_info;
status = rtems_io_control(
the_jnode->info.device.major,
the_jnode->info.device.minor,
(void *) &args
);
if ( status )
return -1;
return args.ioctl_return;
}
/*
* device_lseek
*
* This handler eats all lseek() operations.
*/
int device_lseek(
rtems_libio_t *iop,
off_t offset,
int whence
)
{
return 0;
}
/*
* device_stat
*
* This IMFS_stat() is used.
*/
/*
* device_rmnod
*/
int device_rmnod(
rtems_filesystem_location_info_t *pathloc /* IN */
)
{
IMFS_jnode_t *the_jnode;
the_jnode = (IMFS_jnode_t *) pathloc->node_access;
/*
* Take the node out of the parent's chain that contains this node
*/
if ( the_jnode->Parent != NULL ) {
Chain_Extract( (Chain_Node *) the_jnode );
the_jnode->Parent = NULL;
}
/*
* Decrement the link counter and see if we can free the space.
*/
the_jnode->st_nlink--;
IMFS_update_ctime( the_jnode );
/*
* The file cannot be open and the link must be less than 1 to free.
*/
if ( !rtems_libio_is_file_open( the_jnode ) && (the_jnode->st_nlink < 1) ) {
/*
* Is the rtems_filesystem_current is this node?
*/
if ( rtems_filesystem_current.node_access == pathloc->node_access )
rtems_filesystem_current.node_access = NULL;
/*
* Free memory associated with a memory file.
*/
free( the_jnode );
}
return 0;
}
