int rtems_filesystem_chdir( rtems_filesystem_location_info_t *loc )
{
int rv = 0;
rtems_filesystem_global_location_t *global_loc =
rtems_filesystem_location_transform_to_global( loc );
mode_t type = rtems_filesystem_location_type( &global_loc->location );
if ( S_ISDIR( type ) ) {
rtems_filesystem_global_location_assign(
&rtems_filesystem_current,
global_loc
);
} else {
rtems_filesystem_location_error( &global_loc->location, ENOTDIR );
rtems_filesystem_global_location_release( global_loc, true );
rv = -1;
}
return rv;
}
int rtems_filesystem_chdir( rtems_filesystem_location_info_t *loc )
{
int rv = 0;
rtems_filesystem_global_location_t *global_loc =
rtems_filesystem_location_transform_to_global( loc );
rtems_filesystem_node_types_t type =
rtems_filesystem_node_type( &global_loc->location );
if ( type == RTEMS_FILESYSTEM_DIRECTORY ) {
rtems_filesystem_global_location_assign(
&rtems_filesystem_current,
global_loc
);
} else {
rtems_filesystem_location_error( &global_loc->location, ENOTDIR );
rtems_filesystem_global_location_release( global_loc );
rv = -1;
}
return rv;
}
static int register_subordinate_file_system(
rtems_filesystem_mount_table_entry_t *mt_entry,
const char *target
)
{
int rv = 0;
rtems_filesystem_eval_path_context_t ctx;
int eval_flags = RTEMS_FS_PERMS_RWX
| RTEMS_FS_FOLLOW_LINK;
rtems_filesystem_location_info_t *currentloc =
rtems_filesystem_eval_path_start( &ctx, target, eval_flags );
if ( !rtems_filesystem_location_is_instance_root( currentloc ) ) {
rtems_filesystem_location_info_t targetloc;
rtems_filesystem_global_location_t *mt_point_node;
rtems_filesystem_eval_path_extract_currentloc( &ctx, &targetloc );
mt_point_node = rtems_filesystem_location_transform_to_global( &targetloc );
mt_entry->mt_point_node = mt_point_node;
rv = (*mt_point_node->location.mt_entry->ops->mount_h)( mt_entry );
if ( rv == 0 ) {
rtems_filesystem_mt_lock();
rtems_chain_append_unprotected(
&rtems_filesystem_mount_table,
&mt_entry->mt_node
);
rtems_filesystem_mt_unlock();
} else {
rtems_filesystem_global_location_release( mt_point_node );
}
} else {
rtems_filesystem_eval_path_error( &ctx, EBUSY );
rv = -1;
}
rtems_filesystem_eval_path_cleanup( &ctx );
return rv;
}
int chroot( const char *path )
{
int rv = 0;
rtems_status_code sc = RTEMS_SUCCESSFUL;
rtems_filesystem_eval_path_context_t ctx;
int eval_flags = RTEMS_FS_PERMS_EXEC
| RTEMS_FS_FOLLOW_LINK;
rtems_filesystem_location_info_t loc;
rtems_filesystem_global_location_t *new_current_loc;
/*
* We use the global environment for path evaluation. This makes it possible
* to escape from a chroot environment referencing an unmounted file system.
*/
rtems_filesystem_eval_path_start_with_root_and_current(
&ctx,
path,
eval_flags,
&rtems_global_user_env.root_directory,
&rtems_global_user_env.current_directory
);
rtems_filesystem_eval_path_extract_currentloc( &ctx, &loc );
new_current_loc = rtems_filesystem_location_transform_to_global( &loc );
if ( !rtems_filesystem_global_location_is_null( new_current_loc ) ) {
rtems_filesystem_global_location_t *new_root_loc =
rtems_filesystem_global_location_obtain( &new_current_loc );
rtems_filesystem_node_types_t type =
(*new_root_loc->location.mt_entry->ops->node_type_h)(
&new_root_loc->location
);
if ( type == RTEMS_FILESYSTEM_DIRECTORY ) {
sc = rtems_libio_set_private_env();
if (sc == RTEMS_SUCCESSFUL) {
rtems_filesystem_global_location_assign(
&rtems_filesystem_root,
new_root_loc
);
rtems_filesystem_global_location_assign(
&rtems_filesystem_current,
new_current_loc
);
} else {
if (sc != RTEMS_UNSATISFIED) {
errno = ENOMEM;
}
rv = -1;
}
} else {
rtems_filesystem_location_error( &new_root_loc->location, ENOTDIR );
rv = -1;
}
if ( rv != 0 ) {
rtems_filesystem_global_location_release( new_root_loc );
}
} else {
rv = -1;
}
rtems_filesystem_eval_path_cleanup( &ctx );
if ( rv != 0 ) {
rtems_filesystem_global_location_release( new_current_loc );
}
return rv;
}
