server/device.c

   1 /*
   2  * Server-side device support
   3  *
   4  * Copyright (C) 2007 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <assert.h>
  25 #include <fcntl.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <stdarg.h>
  29
  30 #include "ntstatus.h"
  31 #define WIN32_NO_STATUS
  32 #include "windef.h"
  33 #include "winternl.h"
  34 #include "ddk/wdm.h"
  35
  36 #include "object.h"
  37 #include "file.h"
  38 #include "handle.h"
  39 #include "request.h"
  40 #include "process.h"
  41
  42 /* IRP object */
  43
  44 struct irp_call
  45 {
  46     struct object          obj;           /* object header */
  47     struct list            dev_entry;     /* entry in device queue */
  48     struct list            mgr_entry;     /* entry in manager queue */
  49     struct device_file    *file;          /* file containing this irp */
  50     struct thread         *thread;        /* thread that queued the irp */
  51     client_ptr_t           user_arg;      /* user arg used to identify the request */
  52     struct async          *async;         /* pending async op */
  53     irp_params_t           params;        /* irp parameters */
  54     struct iosb           *iosb;          /* I/O status block */
  55 };
  56
  57 static void irp_call_dump( struct object *obj, int verbose );
  58 static int irp_call_signaled( struct object *obj, struct wait_queue_entry *entry );
  59 static void irp_call_destroy( struct object *obj );
  60
  61 static const struct object_ops irp_call_ops =
  62 {
  63     sizeof(struct irp_call),          /* size */
  64     irp_call_dump,                    /* dump */
  65     no_get_type,                      /* get_type */
  66     add_queue,                        /* add_queue */
  67     remove_queue,                     /* remove_queue */
  68     irp_call_signaled,                /* signaled */
  69     no_satisfied,                     /* satisfied */
  70     no_signal,                        /* signal */
  71     no_get_fd,                        /* get_fd */
  72     no_map_access,                    /* map_access */
  73     default_get_sd,                   /* get_sd */
  74     default_set_sd,                   /* set_sd */
  75     no_lookup_name,                   /* lookup_name */
  76     no_link_name,                     /* link_name */
  77     NULL,                             /* unlink_name */
  78     no_open_file,                     /* open_file */
  79     no_close_handle,                  /* close_handle */
  80     irp_call_destroy                  /* destroy */
  81 };
  82
  83
  84 /* device manager (a list of devices managed by the same client process) */
  85
  86 struct device_manager
  87 {
  88     struct object          obj;           /* object header */
  89     struct list            devices;       /* list of devices */
  90     struct list            requests;      /* list of pending irps across all devices */
  91 };
  92
  93 static void device_manager_dump( struct object *obj, int verbose );
  94 static int device_manager_signaled( struct object *obj, struct wait_queue_entry *entry );
  95 static void device_manager_destroy( struct object *obj );
  96
  97 static const struct object_ops device_manager_ops =
  98 {
  99     sizeof(struct device_manager),    /* size */
 100     device_manager_dump,              /* dump */
 101     no_get_type,                      /* get_type */
 102     add_queue,                        /* add_queue */
 103     remove_queue,                     /* remove_queue */
 104     device_manager_signaled,          /* signaled */
 105     no_satisfied,                     /* satisfied */
 106     no_signal,                        /* signal */
 107     no_get_fd,                        /* get_fd */
 108     no_map_access,                    /* map_access */
 109     default_get_sd,                   /* get_sd */
 110     default_set_sd,                   /* set_sd */
 111     no_lookup_name,                   /* lookup_name */
 112     no_link_name,                     /* link_name */
 113     NULL,                             /* unlink_name */
 114     no_open_file,                     /* open_file */
 115     no_close_handle,                  /* close_handle */
 116     device_manager_destroy            /* destroy */
 117 };
 118
 119
 120 /* device (a single device object) */
 121
 122 struct device
 123 {
 124     struct object          obj;           /* object header */
 125     struct device_manager *manager;       /* manager for this device (or NULL if deleted) */
 126     char                  *unix_path;     /* path to unix device if any */
 127     client_ptr_t           user_ptr;      /* opaque ptr for client side */
 128     struct list            entry;         /* entry in device manager list */
 129     struct list            files;         /* list of open files */
 130 };
 131
 132 static void device_dump( struct object *obj, int verbose );
 133 static struct object_type *device_get_type( struct object *obj );
 134 static void device_destroy( struct object *obj );
 135 static struct object *device_open_file( struct object *obj, unsigned int access,
 136                                         unsigned int sharing, unsigned int options );
 137
 138 static const struct object_ops device_ops =
 139 {
 140     sizeof(struct device),            /* size */
 141     device_dump,                      /* dump */
 142     device_get_type,                  /* get_type */
 143     no_add_queue,                     /* add_queue */
 144     NULL,                             /* remove_queue */
 145     NULL,                             /* signaled */
 146     no_satisfied,                     /* satisfied */
 147     no_signal,                        /* signal */
 148     no_get_fd,                        /* get_fd */
 149     default_fd_map_access,            /* map_access */
 150     default_get_sd,                   /* get_sd */
 151     default_set_sd,                   /* set_sd */
 152     no_lookup_name,                   /* lookup_name */
 153     directory_link_name,              /* link_name */
 154     default_unlink_name,              /* unlink_name */
 155     device_open_file,                 /* open_file */
 156     no_close_handle,                  /* close_handle */
 157     device_destroy                    /* destroy */
 158 };
 159
 160
 161 /* device file (an open file handle to a device) */
 162
 163 struct device_file
 164 {
 165     struct object          obj;           /* object header */
 166     struct device         *device;        /* device for this file */
 167     struct fd             *fd;            /* file descriptor for irp */
 168     client_ptr_t           user_ptr;      /* opaque ptr for client side */
 169     struct list            entry;         /* entry in device list */
 170     struct list            requests;      /* list of pending irp requests */
 171 };
 172
 173 static void device_file_dump( struct object *obj, int verbose );
 174 static struct fd *device_file_get_fd( struct object *obj );
 175 static int device_file_close_handle( struct object *obj, struct process *process, obj_handle_t handle );
 176 static void device_file_destroy( struct object *obj );
 177 static enum server_fd_type device_file_get_fd_type( struct fd *fd );
 178 static obj_handle_t device_file_read( struct fd *fd, const async_data_t *async_data, int blocking,
 179                                       file_pos_t pos );
 180 static obj_handle_t device_file_write( struct fd *fd, const async_data_t *async_data, int blocking,
 181                                        file_pos_t pos, data_size_t *written );
 182 static obj_handle_t device_file_flush( struct fd *fd, const async_data_t *async_data, int blocking );
 183 static obj_handle_t device_file_ioctl( struct fd *fd, ioctl_code_t code, const async_data_t *async_data,
 184                                        int blocking );
 185
 186 static const struct object_ops device_file_ops =
 187 {
 188     sizeof(struct device_file),       /* size */
 189     device_file_dump,                 /* dump */
 190     no_get_type,                      /* get_type */
 191     add_queue,                        /* add_queue */
 192     remove_queue,                     /* remove_queue */
 193     default_fd_signaled,              /* signaled */
 194     no_satisfied,                     /* satisfied */
 195     no_signal,                        /* signal */
 196     device_file_get_fd,               /* get_fd */
 197     default_fd_map_access,            /* map_access */
 198     default_get_sd,                   /* get_sd */
 199     default_set_sd,                   /* set_sd */
 200     no_lookup_name,                   /* lookup_name */
 201     no_link_name,                     /* link_name */
 202     NULL,                             /* unlink_name */
 203     no_open_file,                     /* open_file */
 204     device_file_close_handle,         /* close_handle */
 205     device_file_destroy               /* destroy */
 206 };
 207
 208 static const struct fd_ops device_file_fd_ops =
 209 {
 210     default_fd_get_poll_events,       /* get_poll_events */
 211     default_poll_event,               /* poll_event */
 212     device_file_get_fd_type,          /* get_fd_type */
 213     device_file_read,                 /* read */
 214     device_file_write,                /* write */
 215     device_file_flush,                /* flush */
 216     device_file_ioctl,                /* ioctl */
 217     default_fd_queue_async,           /* queue_async */
 218     default_fd_reselect_async         /* reselect_async */
 219 };
 220
 221
 222 static void irp_call_dump( struct object *obj, int verbose )
 223 {
 224     struct irp_call *irp = (struct irp_call *)obj;
 225     fprintf( stderr, "IRP call file=%p\n", irp->file );
 226 }
 227
 228 static int irp_call_signaled( struct object *obj, struct wait_queue_entry *entry )
 229 {
 230     struct irp_call *irp = (struct irp_call *)obj;
 231
 232     return !irp->file;  /* file is cleared once the irp has completed */
 233 }
 234
 235 static void irp_call_destroy( struct object *obj )
 236 {
 237     struct irp_call *irp = (struct irp_call *)obj;
 238
 239     if (irp->async)
 240     {
 241         async_terminate( irp->async, STATUS_CANCELLED );
 242         release_object( irp->async );
 243     }
 244     if (irp->iosb) release_object( irp->iosb );
 245     if (irp->file) release_object( irp->file );
 246     if (irp->thread) release_object( irp->thread );
 247 }
 248
 249 static struct irp_call *create_irp( struct device_file *file, const irp_params_t *params,
 250                                     const void *in_data, data_size_t in_size, data_size_t out_size )
 251 {
 252     struct irp_call *irp;
 253
 254     if (!file->device->manager)  /* it has been deleted */
 255     {
 256         set_error( STATUS_FILE_DELETED );
 257         return NULL;
 258     }
 259
 260     if ((irp = alloc_object( &irp_call_ops )))
 261     {
 262         irp->file     = (struct device_file *)grab_object( file );
 263         irp->thread   = NULL;
 264         irp->async    = NULL;
 265         irp->params   = *params;
 266
 267         if (!(irp->iosb = create_iosb( in_data, in_size, out_size )))
 268         {
 269             release_object( irp );
 270             irp = NULL;
 271         }
 272     }
 273     return irp;
 274 }
 275
 276 static void set_irp_result( struct irp_call *irp, unsigned int status,
 277                             const void *out_data, data_size_t out_size, data_size_t result )
 278 {
 279     struct device_file *file = irp->file;
 280     struct iosb *iosb = irp->iosb;
 281
 282     if (!file) return;  /* already finished */
 283
 284     /* FIXME: handle the STATUS_PENDING case */
 285     iosb->status = status;
 286     iosb->result = result;
 287     iosb->out_size = min( iosb->out_size, out_size );
 288     if (iosb->out_size && !(iosb->out_data = memdup( out_data, iosb->out_size )))
 289         iosb->out_size = 0;
 290     irp->file = NULL;
 291     if (irp->async)
 292     {
 293         if (result) status = STATUS_ALERTED;
 294         async_terminate( irp->async, status );
 295         release_object( irp->async );
 296         irp->async = NULL;
 297     }
 298     wake_up( &irp->obj, 0 );
 299
 300     /* remove it from the device queue */
 301     list_remove( &irp->dev_entry );
 302     release_object( irp );  /* no longer on the device queue */
 303     release_object( file );
 304 }
 305
 306
 307 static void device_dump( struct object *obj, int verbose )
 308 {
 309     fputs( "Device\n", stderr );
 310 }
 311
 312 static struct object_type *device_get_type( struct object *obj )
 313 {
 314     static const WCHAR name[] = {'D','e','v','i','c','e'};
 315     static const struct unicode_str str = { name, sizeof(name) };
 316     return get_object_type( &str );
 317 }
 318
 319 static void device_destroy( struct object *obj )
 320 {
 321     struct device *device = (struct device *)obj;
 322
 323     assert( list_empty( &device->files ));
 324
 325     free( device->unix_path );
 326     if (device->manager) list_remove( &device->entry );
 327 }
 328
 329 static void add_irp_to_queue( struct device_file *file, struct irp_call *irp, struct thread *thread )
 330 {
 331     struct device_manager *manager = file->device->manager;
 332
 333     assert( manager );
 334
 335     grab_object( irp );  /* grab reference for queued irp */
 336     irp->thread = thread ? (struct thread *)grab_object( thread ) : NULL;
 337     list_add_tail( &file->requests, &irp->dev_entry );
 338     list_add_tail( &manager->requests, &irp->mgr_entry );
 339     if (list_head( &manager->requests ) == &irp->mgr_entry) wake_up( &manager->obj, 0 );  /* first one */
 340 }
 341
 342 static struct object *device_open_file( struct object *obj, unsigned int access,
 343                                         unsigned int sharing, unsigned int options )
 344 {
 345     struct device *device = (struct device *)obj;
 346     struct device_file *file;
 347
 348     if (!(file = alloc_object( &device_file_ops ))) return NULL;
 349
 350     file->device = (struct device *)grab_object( device );
 351     file->user_ptr = 0;
 352     list_init( &file->requests );
 353     list_add_tail( &device->files, &file->entry );
 354     if (device->unix_path)
 355     {
 356         mode_t mode = 0666;
 357         access = file->obj.ops->map_access( &file->obj, access );
 358         file->fd = open_fd( NULL, device->unix_path, O_NONBLOCK | O_LARGEFILE,
 359                             &mode, access, sharing, options );
 360         if (file->fd) set_fd_user( file->fd, &device_file_fd_ops, &file->obj );
 361     }
 362     else file->fd = alloc_pseudo_fd( &device_file_fd_ops, &file->obj, 0 );
 363
 364     if (!file->fd)
 365     {
 366         release_object( file );
 367         return NULL;
 368     }
 369
 370     allow_fd_caching( file->fd );
 371
 372     if (device->manager)
 373     {
 374         struct irp_call *irp;
 375         irp_params_t params;
 376
 377         memset( &params, 0, sizeof(params) );
 378         params.create.major   = IRP_MJ_CREATE;
 379         params.create.access  = access;
 380         params.create.sharing = sharing;
 381         params.create.options = options;
 382         params.create.device  = file->device->user_ptr;
 383
 384         if ((irp = create_irp( file, &params, NULL, 0, 0 )))
 385         {
 386             add_irp_to_queue( file, irp, NULL );
 387             release_object( irp );
 388         }
 389     }
 390     return &file->obj;
 391 }
 392
 393 static void device_file_dump( struct object *obj, int verbose )
 394 {
 395     struct device_file *file = (struct device_file *)obj;
 396
 397     fprintf( stderr, "File on device %p\n", file->device );
 398 }
 399
 400 static struct fd *device_file_get_fd( struct object *obj )
 401 {
 402     struct device_file *file = (struct device_file *)obj;
 403
 404     return (struct fd *)grab_object( file->fd );
 405 }
 406
 407 static int device_file_close_handle( struct object *obj, struct process *process, obj_handle_t handle )
 408 {
 409     struct device_file *file = (struct device_file *)obj;
 410
 411     if (file->device->manager && obj->handle_count == 1)  /* last handle */
 412     {
 413         struct irp_call *irp;
 414         irp_params_t params;
 415
 416         memset( &params, 0, sizeof(params) );
 417         params.close.major = IRP_MJ_CLOSE;
 418         params.close.file  = file->user_ptr;
 419
 420         if ((irp = create_irp( file, &params, NULL, 0, 0 )))
 421         {
 422             add_irp_to_queue( file, irp, NULL );
 423             release_object( irp );
 424         }
 425     }
 426     return 1;
 427 }
 428
 429 static void device_file_destroy( struct object *obj )
 430 {
 431     struct device_file *file = (struct device_file *)obj;
 432     struct irp_call *irp, *next;
 433
 434     LIST_FOR_EACH_ENTRY_SAFE( irp, next, &file->requests, struct irp_call, dev_entry )
 435     {
 436         list_remove( &irp->dev_entry );
 437         release_object( irp );  /* no longer on the device queue */
 438     }
 439     if (file->fd) release_object( file->fd );
 440     list_remove( &file->entry );
 441     release_object( file->device );
 442 }
 443
 444 static void set_file_user_ptr( struct device_file *file, client_ptr_t ptr )
 445 {
 446     struct irp_call *irp;
 447
 448     if (file->user_ptr == ptr) return;  /* nothing to do */
 449
 450     file->user_ptr = ptr;
 451
 452     /* update already queued irps */
 453
 454     LIST_FOR_EACH_ENTRY( irp, &file->requests, struct irp_call, dev_entry )
 455     {
 456         switch (irp->params.major)
 457         {
 458         case IRP_MJ_CLOSE:          irp->params.close.file = ptr; break;
 459         case IRP_MJ_READ:           irp->params.read.file  = ptr; break;
 460         case IRP_MJ_WRITE:          irp->params.write.file = ptr; break;
 461         case IRP_MJ_FLUSH_BUFFERS:  irp->params.flush.file = ptr; break;
 462         case IRP_MJ_DEVICE_CONTROL: irp->params.ioctl.file = ptr; break;
 463         }
 464     }
 465 }
 466
 467 /* queue an irp to the device */
 468 static obj_handle_t queue_irp( struct device_file *file, struct irp_call *irp,
 469                                const async_data_t *async_data, int blocking )
 470 {
 471     obj_handle_t handle = 0;
 472
 473     if (blocking && !(handle = alloc_handle( current->process, irp, SYNCHRONIZE, 0 ))) return 0;
 474
 475     if (!(irp->async = fd_queue_async( file->fd, async_data, irp->iosb, ASYNC_TYPE_WAIT )))
 476     {
 477         if (handle) close_handle( current->process, handle );
 478         return 0;
 479     }
 480     irp->user_arg = async_data->arg;
 481     add_irp_to_queue( file, irp, current );
 482     set_error( STATUS_PENDING );
 483     return handle;
 484 }
 485
 486 static enum server_fd_type device_file_get_fd_type( struct fd *fd )
 487 {
 488     return FD_TYPE_DEVICE;
 489 }
 490
 491 static obj_handle_t device_file_read( struct fd *fd, const async_data_t *async_data, int blocking,
 492                                       file_pos_t pos )
 493 {
 494     struct device_file *file = get_fd_user( fd );
 495     struct irp_call *irp;
 496     obj_handle_t handle;
 497     irp_params_t params;
 498
 499     memset( &params, 0, sizeof(params) );
 500     params.read.major = IRP_MJ_READ;
 501     params.read.key   = 0;
 502     params.read.pos   = pos;
 503     params.read.file  = file->user_ptr;
 504
 505     irp = create_irp( file, &params, NULL, 0, get_reply_max_size() );
 506     if (!irp) return 0;
 507
 508     handle = queue_irp( file, irp, async_data, blocking );
 509     release_object( irp );
 510     return handle;
 511 }
 512
 513 static obj_handle_t device_file_write( struct fd *fd, const async_data_t *async_data, int blocking,
 514                                        file_pos_t pos, data_size_t *written )
 515 {
 516     struct device_file *file = get_fd_user( fd );
 517     struct irp_call *irp;
 518     obj_handle_t handle;
 519     irp_params_t params;
 520
 521     memset( &params, 0, sizeof(params) );
 522     params.write.major = IRP_MJ_WRITE;
 523     params.write.key   = 0;
 524     params.write.pos   = pos;
 525     params.write.file  = file->user_ptr;
 526
 527     irp = create_irp( file, &params, get_req_data(), get_req_data_size(), 0 );
 528     if (!irp) return 0;
 529
 530     handle = queue_irp( file, irp, async_data, blocking );
 531     release_object( irp );
 532     return handle;
 533 }
 534
 535 static obj_handle_t device_file_flush( struct fd *fd, const async_data_t *async_data, int blocking )
 536 {
 537     struct device_file *file = get_fd_user( fd );
 538     struct irp_call *irp;
 539     obj_handle_t handle;
 540     irp_params_t params;
 541
 542     memset( &params, 0, sizeof(params) );
 543     params.flush.major = IRP_MJ_FLUSH_BUFFERS;
 544     params.flush.file  = file->user_ptr;
 545
 546     irp = create_irp( file, &params, NULL, 0, 0 );
 547     if (!irp) return 0;
 548
 549     handle = queue_irp( file, irp, async_data, blocking );
 550     release_object( irp );
 551     return handle;
 552 }
 553
 554 static obj_handle_t device_file_ioctl( struct fd *fd, ioctl_code_t code, const async_data_t *async_data,
 555                                        int blocking )
 556 {
 557     struct device_file *file = get_fd_user( fd );
 558     struct irp_call *irp;
 559     obj_handle_t handle;
 560     irp_params_t params;
 561
 562     memset( &params, 0, sizeof(params) );
 563     params.ioctl.major = IRP_MJ_DEVICE_CONTROL;
 564     params.ioctl.code  = code;
 565     params.ioctl.file = file->user_ptr;
 566
 567     irp = create_irp( file, &params, get_req_data(), get_req_data_size(),
 568                       get_reply_max_size() );
 569     if (!irp) return 0;
 570
 571     handle = queue_irp( file, irp, async_data, blocking );
 572     release_object( irp );
 573     return handle;
 574 }
 575
 576 static struct device *create_device( struct object *root, const struct unicode_str *name,
 577                                      struct device_manager *manager, unsigned int attr )
 578 {
 579     struct device *device;
 580
 581     if ((device = create_named_object( root, &device_ops, name, attr, NULL )))
 582     {
 583         if (get_error() != STATUS_OBJECT_NAME_EXISTS)
 584         {
 585             /* initialize it if it didn't already exist */
 586             device->unix_path = NULL;
 587             device->manager = manager;
 588             list_add_tail( &manager->devices, &device->entry );
 589             list_init( &device->files );
 590         }
 591     }
 592     return device;
 593 }
 594
 595 struct object *create_unix_device( struct object *root, const struct unicode_str *name,
 596                                    const char *unix_path )
 597 {
 598     struct device *device;
 599
 600     if ((device = create_named_object( root, &device_ops, name, 0, NULL )))
 601     {
 602         device->unix_path = strdup( unix_path );
 603         device->manager = NULL;  /* no manager, requests go straight to the Unix device */
 604         list_init( &device->files );
 605     }
 606     return &device->obj;
 607
 608 }
 609
 610 /* terminate requests when the underlying device is deleted */
 611 static void delete_file( struct device_file *file )
 612 {
 613     struct irp_call *irp, *next;
 614
 615     /* terminate all pending requests */
 616     LIST_FOR_EACH_ENTRY_SAFE( irp, next, &file->requests, struct irp_call, dev_entry )
 617     {
 618         list_remove( &irp->mgr_entry );
 619         set_irp_result( irp, STATUS_FILE_DELETED, NULL, 0, 0 );
 620     }
 621 }
 622
 623 static void delete_device( struct device *device )
 624 {
 625     struct device_file *file, *next;
 626
 627     if (!device->manager) return;  /* already deleted */
 628
 629     LIST_FOR_EACH_ENTRY_SAFE( file, next, &device->files, struct device_file, entry )
 630         delete_file( file );
 631
 632     unlink_named_object( &device->obj );
 633     list_remove( &device->entry );
 634     device->manager = NULL;
 635 }
 636
 637
 638 static void device_manager_dump( struct object *obj, int verbose )
 639 {
 640     fprintf( stderr, "Device manager\n" );
 641 }
 642
 643 static int device_manager_signaled( struct object *obj, struct wait_queue_entry *entry )
 644 {
 645     struct device_manager *manager = (struct device_manager *)obj;
 646
 647     return !list_empty( &manager->requests );
 648 }
 649
 650 static void device_manager_destroy( struct object *obj )
 651 {
 652     struct device_manager *manager = (struct device_manager *)obj;
 653     struct list *ptr;
 654
 655     while ((ptr = list_head( &manager->devices )))
 656     {
 657         struct device *device = LIST_ENTRY( ptr, struct device, entry );
 658         delete_device( device );
 659     }
 660 }
 661
 662 static struct device_manager *create_device_manager(void)
 663 {
 664     struct device_manager *manager;
 665
 666     if ((manager = alloc_object( &device_manager_ops )))
 667     {
 668         list_init( &manager->devices );
 669         list_init( &manager->requests );
 670     }
 671     return manager;
 672 }
 673
 674
 675 /* create a device manager */
 676 DECL_HANDLER(create_device_manager)
 677 {
 678     struct device_manager *manager = create_device_manager();
 679
 680     if (manager)
 681     {
 682         reply->handle = alloc_handle( current->process, manager, req->access, req->attributes );
 683         release_object( manager );
 684     }
 685 }
 686
 687
 688 /* create a device */
 689 DECL_HANDLER(create_device)
 690 {
 691     struct device *device;
 692     struct unicode_str name = get_req_unicode_str();
 693     struct device_manager *manager;
 694     struct object *root = NULL;
 695
 696     if (!(manager = (struct device_manager *)get_handle_obj( current->process, req->manager,
 697                                                              0, &device_manager_ops )))
 698         return;
 699
 700     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir )))
 701     {
 702         release_object( manager );
 703         return;
 704     }
 705
 706     if ((device = create_device( root, &name, manager, req->attributes )))
 707     {
 708         device->user_ptr = req->user_ptr;
 709         reply->handle = alloc_handle( current->process, device, req->access, req->attributes );
 710         release_object( device );
 711     }
 712
 713     if (root) release_object( root );
 714     release_object( manager );
 715 }
 716
 717
 718 /* delete a device */
 719 DECL_HANDLER(delete_device)
 720 {
 721     struct device *device;
 722
 723     if ((device = (struct device *)get_handle_obj( current->process, req->handle, 0, &device_ops )))
 724     {
 725         delete_device( device );
 726         release_object( device );
 727     }
 728 }
 729
 730
 731 /* retrieve the next pending device irp request */
 732 DECL_HANDLER(get_next_device_request)
 733 {
 734     struct irp_call *irp;
 735     struct device_manager *manager;
 736     struct list *ptr;
 737     struct iosb *iosb;
 738
 739     reply->params.major = IRP_MJ_MAXIMUM_FUNCTION + 1;
 740
 741     if (!(manager = (struct device_manager *)get_handle_obj( current->process, req->manager,
 742                                                              0, &device_manager_ops )))
 743         return;
 744
 745     if (req->prev)
 746     {
 747         if ((irp = (struct irp_call *)get_handle_obj( current->process, req->prev, 0, &irp_call_ops )))
 748         {
 749             set_irp_result( irp, req->status, NULL, 0, 0 );
 750             close_handle( current->process, req->prev );  /* avoid an extra round-trip for close */
 751             release_object( irp );
 752         }
 753         clear_error();
 754     }
 755
 756     if ((ptr = list_head( &manager->requests )))
 757     {
 758         irp = LIST_ENTRY( ptr, struct irp_call, mgr_entry );
 759         if (irp->thread)
 760         {
 761             reply->client_pid = get_process_id( irp->thread->process );
 762             reply->client_tid = get_thread_id( irp->thread );
 763         }
 764         reply->params = irp->params;
 765         iosb = irp->iosb;
 766         reply->in_size = iosb->in_size;
 767         reply->out_size = iosb->out_size;
 768         if (iosb->in_size > get_reply_max_size()) set_error( STATUS_BUFFER_OVERFLOW );
 769         else if ((reply->next = alloc_handle( current->process, irp, 0, 0 )))
 770         {
 771             set_reply_data_ptr( iosb->in_data, iosb->in_size );
 772             iosb->in_data = NULL;
 773             iosb->in_size = 0;
 774             list_remove( &irp->mgr_entry );
 775             list_init( &irp->mgr_entry );
 776         }
 777     }
 778     else set_error( STATUS_PENDING );
 779
 780     release_object( manager );
 781 }
 782
 783
 784 /* store results of an async irp */
 785 DECL_HANDLER(set_irp_result)
 786 {
 787     struct irp_call *irp;
 788
 789     if ((irp = (struct irp_call *)get_handle_obj( current->process, req->handle, 0, &irp_call_ops )))
 790     {
 791         if (irp->file) set_file_user_ptr( irp->file, req->file_ptr );
 792         set_irp_result( irp, req->status, get_req_data(), get_req_data_size(), req->size );
 793         close_handle( current->process, req->handle );  /* avoid an extra round-trip for close */
 794         release_object( irp );
 795     }
 796 }