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Sweden-Number/server/device.c

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/*
* Server-side device support
*
* Copyright (C) 2007 Alexandre Julliard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "windef.h"
#include "winternl.h"
#include "object.h"
#include "file.h"
#include "handle.h"
#include "request.h"
#include "process.h"
struct ioctl_call
{
struct object obj; /* object header */
struct list dev_entry; /* entry in device queue */
struct list mgr_entry; /* entry in manager queue */
struct device *device; /* device containing this ioctl */
struct thread *thread; /* thread that queued the ioctl */
client_ptr_t user_arg; /* user arg used to identify the request */
struct async *async; /* pending async op */
ioctl_code_t code; /* ioctl code */
unsigned int status; /* resulting status (or STATUS_PENDING) */
data_size_t in_size; /* size of input data */
void *in_data; /* input data */
data_size_t out_size; /* size of output data */
void *out_data; /* output data */
};
static void ioctl_call_dump( struct object *obj, int verbose );
static int ioctl_call_signaled( struct object *obj, struct thread *thread );
static void ioctl_call_destroy( struct object *obj );
static const struct object_ops ioctl_call_ops =
{
sizeof(struct ioctl_call), /* size */
ioctl_call_dump, /* dump */
no_get_type, /* get_type */
add_queue, /* add_queue */
remove_queue, /* remove_queue */
ioctl_call_signaled, /* signaled */
no_satisfied, /* satisfied */
no_signal, /* signal */
no_get_fd, /* get_fd */
no_map_access, /* map_access */
default_get_sd, /* get_sd */
default_set_sd, /* set_sd */
no_lookup_name, /* lookup_name */
no_open_file, /* open_file */
no_close_handle, /* close_handle */
ioctl_call_destroy /* destroy */
};
struct device_manager
{
struct object obj; /* object header */
struct list devices; /* list of devices */
struct list requests; /* list of pending ioctls across all devices */
};
static void device_manager_dump( struct object *obj, int verbose );
static int device_manager_signaled( struct object *obj, struct thread *thread );
static void device_manager_destroy( struct object *obj );
static const struct object_ops device_manager_ops =
{
sizeof(struct device_manager), /* size */
device_manager_dump, /* dump */
no_get_type, /* get_type */
add_queue, /* add_queue */
remove_queue, /* remove_queue */
device_manager_signaled, /* signaled */
no_satisfied, /* satisfied */
no_signal, /* signal */
no_get_fd, /* get_fd */
no_map_access, /* map_access */
default_get_sd, /* get_sd */
default_set_sd, /* set_sd */
no_lookup_name, /* lookup_name */
no_open_file, /* open_file */
no_close_handle, /* close_handle */
device_manager_destroy /* destroy */
};
struct device
{
struct object obj; /* object header */
struct device_manager *manager; /* manager for this device (or NULL if deleted) */
struct fd *fd; /* file descriptor for ioctl */
client_ptr_t user_ptr; /* opaque ptr for client side */
struct list entry; /* entry in device manager list */
struct list requests; /* list of pending ioctl requests */
};
static void device_dump( struct object *obj, int verbose );
static struct object_type *device_get_type( struct object *obj );
static struct fd *device_get_fd( struct object *obj );
static void device_destroy( struct object *obj );
static struct object *device_open_file( struct object *obj, unsigned int access,
unsigned int sharing, unsigned int options );
static enum server_fd_type device_get_fd_type( struct fd *fd );
static obj_handle_t device_ioctl( struct fd *fd, ioctl_code_t code, const async_data_t *async_data,
int blocking, const void *data, data_size_t size );
static const struct object_ops device_ops =
{
sizeof(struct device), /* size */
device_dump, /* dump */
device_get_type, /* get_type */
no_add_queue, /* add_queue */
NULL, /* remove_queue */
NULL, /* signaled */
no_satisfied, /* satisfied */
no_signal, /* signal */
device_get_fd, /* get_fd */
default_fd_map_access, /* map_access */
default_get_sd, /* get_sd */
default_set_sd, /* set_sd */
no_lookup_name, /* lookup_name */
device_open_file, /* open_file */
no_close_handle, /* close_handle */
device_destroy /* destroy */
};
static const struct fd_ops device_fd_ops =
{
default_fd_get_poll_events, /* get_poll_events */
default_poll_event, /* poll_event */
no_flush, /* flush */
device_get_fd_type, /* get_fd_type */
device_ioctl, /* ioctl */
default_fd_queue_async, /* queue_async */
default_fd_reselect_async, /* reselect_async */
default_fd_cancel_async /* cancel_async */
};
static void ioctl_call_dump( struct object *obj, int verbose )
{
struct ioctl_call *ioctl = (struct ioctl_call *)obj;
fprintf( stderr, "Ioctl call code=%08x device=%p\n", ioctl->code, ioctl->device );
}
static int ioctl_call_signaled( struct object *obj, struct thread *thread )
{
struct ioctl_call *ioctl = (struct ioctl_call *)obj;
return !ioctl->device; /* device is cleared once the ioctl has completed */
}
static void ioctl_call_destroy( struct object *obj )
{
struct ioctl_call *ioctl = (struct ioctl_call *)obj;
free( ioctl->in_data );
free( ioctl->out_data );
if (ioctl->async)
{
async_terminate( ioctl->async, STATUS_CANCELLED );
release_object( ioctl->async );
}
if (ioctl->device) release_object( ioctl->device );
release_object( ioctl->thread );
}
static struct ioctl_call *create_ioctl( struct device *device, ioctl_code_t code,
const void *in_data, data_size_t in_size,
data_size_t out_size )
{
struct ioctl_call *ioctl;
if ((ioctl = alloc_object( &ioctl_call_ops )))
{
ioctl->device = (struct device *)grab_object( device );
ioctl->code = code;
ioctl->async = NULL;
ioctl->status = STATUS_PENDING;
ioctl->in_size = in_size;
ioctl->in_data = NULL;
ioctl->out_size = out_size;
ioctl->out_data = NULL;
if (ioctl->in_size && !(ioctl->in_data = memdup( in_data, in_size )))
{
release_object( ioctl );
ioctl = NULL;
}
}
return ioctl;
}
static void set_ioctl_result( struct ioctl_call *ioctl, unsigned int status,
const void *out_data, data_size_t out_size )
{
struct device *device = ioctl->device;
if (!device) return; /* already finished */
/* FIXME: handle the STATUS_PENDING case */
ioctl->status = status;
ioctl->out_size = min( ioctl->out_size, out_size );
if (ioctl->out_size && !(ioctl->out_data = memdup( out_data, ioctl->out_size )))
ioctl->out_size = 0;
release_object( device );
ioctl->device = NULL;
if (ioctl->async)
{
if (ioctl->out_size) status = STATUS_ALERTED;
async_terminate( ioctl->async, status );
release_object( ioctl->async );
ioctl->async = NULL;
}
wake_up( &ioctl->obj, 0 );
if (status != STATUS_ALERTED)
{
/* remove it from the device queue */
/* (for STATUS_ALERTED this will be done in get_ioctl_result) */
list_remove( &ioctl->dev_entry );
release_object( ioctl ); /* no longer on the device queue */
}
}
static void device_dump( struct object *obj, int verbose )
{
struct device *device = (struct device *)obj;
fprintf( stderr, "Device " );
dump_object_name( &device->obj );
fputc( '\n', stderr );
}
static struct object_type *device_get_type( struct object *obj )
{
static const WCHAR name[] = {'D','e','v','i','c','e'};
static const struct unicode_str str = { name, sizeof(name) };
return get_object_type( &str );
}
static struct fd *device_get_fd( struct object *obj )
{
struct device *device = (struct device *)obj;
return (struct fd *)grab_object( device->fd );
}
static void device_destroy( struct object *obj )
{
struct device *device = (struct device *)obj;
struct ioctl_call *ioctl, *next;
LIST_FOR_EACH_ENTRY_SAFE( ioctl, next, &device->requests, struct ioctl_call, dev_entry )
{
list_remove( &ioctl->dev_entry );
release_object( ioctl ); /* no longer on the device queue */
}
if (device->fd) release_object( device->fd );
if (device->manager) list_remove( &device->entry );
}
static struct object *device_open_file( struct object *obj, unsigned int access,
unsigned int sharing, unsigned int options )
{
return grab_object( obj );
}
static enum server_fd_type device_get_fd_type( struct fd *fd )
{
return FD_TYPE_DEVICE;
}
static struct ioctl_call *find_ioctl_call( struct device *device, struct thread *thread,
client_ptr_t user_arg )
{
struct ioctl_call *ioctl;
LIST_FOR_EACH_ENTRY( ioctl, &device->requests, struct ioctl_call, dev_entry )
if (ioctl->thread == thread && ioctl->user_arg == user_arg) return ioctl;
set_error( STATUS_INVALID_PARAMETER );
return NULL;
}
static obj_handle_t device_ioctl( struct fd *fd, ioctl_code_t code, const async_data_t *async_data,
int blocking, const void *data, data_size_t size )
{
struct device *device = get_fd_user( fd );
struct ioctl_call *ioctl;
obj_handle_t handle;
if (!device->manager) /* it has been deleted */
{
set_error( STATUS_FILE_DELETED );
return 0;
}
if (!(ioctl = create_ioctl( device, code, data, size, get_reply_max_size() )))
return 0;
ioctl->thread = (struct thread *)grab_object( current );
ioctl->user_arg = async_data->arg;
if (!(handle = alloc_handle( current->process, ioctl, SYNCHRONIZE, 0 )))
{
release_object( ioctl );
return 0;
}
if (!(ioctl->async = fd_queue_async( device->fd, async_data, ASYNC_TYPE_WAIT )))
{
close_handle( current->process, handle );
release_object( ioctl );
return 0;
}
list_add_tail( &device->requests, &ioctl->dev_entry );
list_add_tail( &device->manager->requests, &ioctl->mgr_entry );
if (list_head( &device->manager->requests ) == &ioctl->mgr_entry) /* first one */
wake_up( &device->manager->obj, 0 );
/* don't release ioctl since it is now queued in the device */
set_error( STATUS_PENDING );
return handle;
}
static struct device *create_device( struct directory *root, const struct unicode_str *name,
struct device_manager *manager, unsigned int attr )
{
struct device *device;
if ((device = create_named_object_dir( root, name, attr, &device_ops )))
{
if (get_error() != STATUS_OBJECT_NAME_EXISTS)
{
/* initialize it if it didn't already exist */
device->manager = manager;
list_add_tail( &manager->devices, &device->entry );
list_init( &device->requests );
if (!(device->fd = alloc_pseudo_fd( &device_fd_ops, &device->obj, 0 )))
{
release_object( device );
device = NULL;
}
}
}
return device;
}
static void delete_device( struct device *device )
{
struct ioctl_call *ioctl, *next;
if (!device->manager) return; /* already deleted */
/* terminate all pending requests */
LIST_FOR_EACH_ENTRY_SAFE( ioctl, next, &device->requests, struct ioctl_call, dev_entry )
{
list_remove( &ioctl->mgr_entry );
set_ioctl_result( ioctl, STATUS_FILE_DELETED, NULL, 0 );
}
unlink_named_object( &device->obj );
list_remove( &device->entry );
device->manager = NULL;
}
static void device_manager_dump( struct object *obj, int verbose )
{
fprintf( stderr, "Device manager\n" );
}
static int device_manager_signaled( struct object *obj, struct thread *thread )
{
struct device_manager *manager = (struct device_manager *)obj;
return !list_empty( &manager->requests );
}
static void device_manager_destroy( struct object *obj )
{
struct device_manager *manager = (struct device_manager *)obj;
struct list *ptr;
while ((ptr = list_head( &manager->devices )))
{
struct device *device = LIST_ENTRY( ptr, struct device, entry );
delete_device( device );
}
}
static struct device_manager *create_device_manager(void)
{
struct device_manager *manager;
if ((manager = alloc_object( &device_manager_ops )))
{
list_init( &manager->devices );
list_init( &manager->requests );
}
return manager;
}
/* create a device manager */
DECL_HANDLER(create_device_manager)
{
struct device_manager *manager = create_device_manager();
if (manager)
{
reply->handle = alloc_handle( current->process, manager, req->access, req->attributes );
release_object( manager );
}
}
/* create a device */
DECL_HANDLER(create_device)
{
struct device *device;
struct unicode_str name;
struct device_manager *manager;
struct directory *root = NULL;
if (!(manager = (struct device_manager *)get_handle_obj( current->process, req->manager,
0, &device_manager_ops )))
return;
get_req_unicode_str( &name );
if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
{
release_object( manager );
return;
}
if ((device = create_device( root, &name, manager, req->attributes )))
{
device->user_ptr = req->user_ptr;
reply->handle = alloc_handle( current->process, device, req->access, req->attributes );
release_object( device );
}
if (root) release_object( root );
release_object( manager );
}
/* delete a device */
DECL_HANDLER(delete_device)
{
struct device *device;
if ((device = (struct device *)get_handle_obj( current->process, req->handle, 0, &device_ops )))
{
delete_device( device );
release_object( device );
}
}
/* retrieve the next pending device ioctl request */
DECL_HANDLER(get_next_device_request)
{
struct ioctl_call *ioctl;
struct device_manager *manager;
struct list *ptr;
if (!(manager = (struct device_manager *)get_handle_obj( current->process, req->manager,
0, &device_manager_ops )))
return;
if (req->prev)
{
if ((ioctl = (struct ioctl_call *)get_handle_obj( current->process, req->prev,
0, &ioctl_call_ops )))
{
set_ioctl_result( ioctl, req->status, get_req_data(), get_req_data_size() );
close_handle( current->process, req->prev ); /* avoid an extra round-trip for close */
release_object( ioctl );
}
clear_error();
}
if ((ptr = list_head( &manager->requests )))
{
ioctl = LIST_ENTRY( ptr, struct ioctl_call, mgr_entry );
reply->code = ioctl->code;
reply->user_ptr = ioctl->device->user_ptr;
reply->client_pid = get_process_id( ioctl->thread->process );
reply->client_tid = get_thread_id( ioctl->thread );
reply->in_size = ioctl->in_size;
reply->out_size = ioctl->out_size;
if (ioctl->in_size > get_reply_max_size()) set_error( STATUS_BUFFER_OVERFLOW );
else if ((reply->next = alloc_handle( current->process, ioctl, 0, 0 )))
{
set_reply_data_ptr( ioctl->in_data, ioctl->in_size );
ioctl->in_data = NULL;
ioctl->in_size = 0;
list_remove( &ioctl->mgr_entry );
list_init( &ioctl->mgr_entry );
}
}
else set_error( STATUS_PENDING );
release_object( manager );
}
/* retrieve results of an async ioctl */
DECL_HANDLER(get_ioctl_result)
{
struct device *device;
struct ioctl_call *ioctl;
if (!(device = (struct device *)get_handle_obj( current->process, req->handle, 0, &device_ops )))
return;
if ((ioctl = find_ioctl_call( device, current, req->user_arg )))
{
if (ioctl->out_data)
{
data_size_t size = min( ioctl->out_size, get_reply_max_size() );
if (size)
{
set_reply_data_ptr( ioctl->out_data, size );
ioctl->out_data = NULL;
}
}
set_error( ioctl->status );
list_remove( &ioctl->dev_entry );
release_object( ioctl ); /* no longer on the device queue */
}
release_object( device );
}
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