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     unsigned int           status;        /* resulting status (or STATUS_PENDING) */
  54     irp_params_t           params;        /* irp parameters */
  55     data_size_t            result;        /* size of result (input or output depending on the type) */
  56     data_size_t            in_size;       /* size of input data */
  57     void                  *in_data;       /* input data */
  58     data_size_t            out_size;      /* size of output data */
  59     void                  *out_data;      /* output data */
  60 };
  61
  62 static void irp_call_dump( struct object *obj, int verbose );
  63 static int irp_call_signaled( struct object *obj, struct wait_queue_entry *entry );
  64 static void irp_call_destroy( struct object *obj );
  65
  66 static const struct object_ops irp_call_ops =
  67 {
  68     sizeof(struct irp_call),          /* size */
  69     irp_call_dump,                    /* dump */
  70     no_get_type,                      /* get_type */
  71     add_queue,                        /* add_queue */
  72     remove_queue,                     /* remove_queue */
  73     irp_call_signaled,                /* signaled */
  74     no_satisfied,                     /* satisfied */
  75     no_signal,                        /* signal */
  76     no_get_fd,                        /* get_fd */
  77     no_map_access,                    /* map_access */
  78     default_get_sd,                   /* get_sd */
  79     default_set_sd,                   /* set_sd */
  80     no_lookup_name,                   /* lookup_name */
  81     no_link_name,                     /* link_name */
  82     NULL,                             /* unlink_name */
  83     no_open_file,                     /* open_file */
  84     no_close_handle,                  /* close_handle */
  85     irp_call_destroy                  /* destroy */
  86 };
  87
  88
  89 /* device manager (a list of devices managed by the same client process) */
  90
  91 struct device_manager
  92 {
  93     struct object          obj;           /* object header */
  94     struct list            devices;       /* list of devices */
  95     struct list            requests;      /* list of pending irps across all devices */
  96 };
  97
  98 static void device_manager_dump( struct object *obj, int verbose );
  99 static int device_manager_signaled( struct object *obj, struct wait_queue_entry *entry );
 100 static void device_manager_destroy( struct object *obj );
 101
 102 static const struct object_ops device_manager_ops =
 103 {
 104     sizeof(struct device_manager),    /* size */
 105     device_manager_dump,              /* dump */
 106     no_get_type,                      /* get_type */
 107     add_queue,                        /* add_queue */
 108     remove_queue,                     /* remove_queue */
 109     device_manager_signaled,          /* signaled */
 110     no_satisfied,                     /* satisfied */
 111     no_signal,                        /* signal */
 112     no_get_fd,                        /* get_fd */
 113     no_map_access,                    /* map_access */
 114     default_get_sd,                   /* get_sd */
 115     default_set_sd,                   /* set_sd */
 116     no_lookup_name,                   /* lookup_name */
 117     no_link_name,                     /* link_name */
 118     NULL,                             /* unlink_name */
 119     no_open_file,                     /* open_file */
 120     no_close_handle,                  /* close_handle */
 121     device_manager_destroy            /* destroy */
 122 };
 123
 124
 125 /* device (a single device object) */
 126
 127 struct device
 128 {
 129     struct object          obj;           /* object header */
 130     struct device_manager *manager;       /* manager for this device (or NULL if deleted) */
 131     char                  *unix_path;     /* path to unix device if any */
 132     client_ptr_t           user_ptr;      /* opaque ptr for client side */
 133     struct list            entry;         /* entry in device manager list */
 134     struct list            files;         /* list of open files */
 135 };
 136
 137 static void device_dump( struct object *obj, int verbose );
 138 static struct object_type *device_get_type( struct object *obj );
 139 static void device_destroy( struct object *obj );
 140 static struct object *device_open_file( struct object *obj, unsigned int access,
 141                                         unsigned int sharing, unsigned int options );
 142
 143 static const struct object_ops device_ops =
 144 {
 145     sizeof(struct device),            /* size */
 146     device_dump,                      /* dump */
 147     device_get_type,                  /* get_type */
 148     no_add_queue,                     /* add_queue */
 149     NULL,                             /* remove_queue */
 150     NULL,                             /* signaled */
 151     no_satisfied,                     /* satisfied */
 152     no_signal,                        /* signal */
 153     no_get_fd,                        /* get_fd */
 154     default_fd_map_access,            /* map_access */
 155     default_get_sd,                   /* get_sd */
 156     default_set_sd,                   /* set_sd */
 157     no_lookup_name,                   /* lookup_name */
 158     directory_link_name,              /* link_name */
 159     default_unlink_name,              /* unlink_name */
 160     device_open_file,                 /* open_file */
 161     no_close_handle,                  /* close_handle */
 162     device_destroy                    /* destroy */
 163 };
 164
 165
 166 /* device file (an open file handle to a device) */
 167
 168 struct device_file
 169 {
 170     struct object          obj;           /* object header */
 171     struct device         *device;        /* device for this file */
 172     struct fd             *fd;            /* file descriptor for irp */
 173     client_ptr_t           user_ptr;      /* opaque ptr for client side */
 174     struct list            entry;         /* entry in device list */
 175     struct list            requests;      /* list of pending irp requests */
 176 };
 177
 178 static void device_file_dump( struct object *obj, int verbose );
 179 static struct fd *device_file_get_fd( struct object *obj );
 180 static int device_file_close_handle( struct object *obj, struct process *process, obj_handle_t handle );
 181 static void device_file_destroy( struct object *obj );
 182 static enum server_fd_type device_file_get_fd_type( struct fd *fd );
 183 static obj_handle_t device_file_read( struct fd *fd, const async_data_t *async_data, int blocking,
 184                                       file_pos_t pos );
 185 static obj_handle_t device_file_write( struct fd *fd, const async_data_t *async_data, int blocking,
 186                                        file_pos_t pos, data_size_t *written );
 187 static obj_handle_t device_file_flush( struct fd *fd, const async_data_t *async_data, int blocking );
 188 static obj_handle_t device_file_ioctl( struct fd *fd, ioctl_code_t code, const async_data_t *async_data,
 189                                        int blocking );
 190
 191 static const struct object_ops device_file_ops =
 192 {
 193     sizeof(struct device_file),       /* size */
 194     device_file_dump,                 /* dump */
 195     no_get_type,                      /* get_type */
 196     add_queue,                        /* add_queue */
 197     remove_queue,                     /* remove_queue */
 198     default_fd_signaled,              /* signaled */
 199     no_satisfied,                     /* satisfied */
 200     no_signal,                        /* signal */
 201     device_file_get_fd,               /* get_fd */
 202     default_fd_map_access,            /* map_access */
 203     default_get_sd,                   /* get_sd */
 204     default_set_sd,                   /* set_sd */
 205     no_lookup_name,                   /* lookup_name */
 206     no_link_name,                     /* link_name */
 207     NULL,                             /* unlink_name */
 208     no_open_file,                     /* open_file */
 209     device_file_close_handle,         /* close_handle */
 210     device_file_destroy               /* destroy */
 211 };
 212
 213 static const struct fd_ops device_file_fd_ops =
 214 {
 215     default_fd_get_poll_events,       /* get_poll_events */
 216     default_poll_event,               /* poll_event */
 217     device_file_get_fd_type,          /* get_fd_type */
 218     device_file_read,                 /* read */
 219     device_file_write,                /* write */
 220     device_file_flush,                /* flush */
 221     device_file_ioctl,                /* ioctl */
 222     default_fd_queue_async,           /* queue_async */
 223     default_fd_reselect_async,        /* reselect_async */
 224     default_fd_cancel_async           /* cancel_async */
 225 };
 226
 227
 228 static void irp_call_dump( struct object *obj, int verbose )
 229 {
 230     struct irp_call *irp = (struct irp_call *)obj;
 231     fprintf( stderr, "IRP call file=%p\n", irp->file );
 232 }
 233
 234 static int irp_call_signaled( struct object *obj, struct wait_queue_entry *entry )
 235 {
 236     struct irp_call *irp = (struct irp_call *)obj;
 237
 238     return !irp->file;  /* file is cleared once the irp has completed */
 239 }
 240
 241 static void irp_call_destroy( struct object *obj )
 242 {
 243     struct irp_call *irp = (struct irp_call *)obj;
 244
 245     free( irp->in_data );
 246     free( irp->out_data );
 247     if (irp->async)
 248     {
 249         async_terminate( irp->async, STATUS_CANCELLED );
 250         release_object( irp->async );
 251     }
 252     if (irp->file) release_object( irp->file );
 253     if (irp->thread) release_object( irp->thread );
 254 }
 255
 256 static struct irp_call *create_irp( struct device_file *file, const irp_params_t *params,
 257                                     const void *in_data, data_size_t in_size, data_size_t out_size )
 258 {
 259     struct irp_call *irp;
 260
 261     if (!file->device->manager)  /* it has been deleted */
 262     {
 263         set_error( STATUS_FILE_DELETED );
 264         return NULL;
 265     }
 266
 267     if ((irp = alloc_object( &irp_call_ops )))
 268     {
 269         irp->file     = (struct device_file *)grab_object( file );
 270         irp->thread   = NULL;
 271         irp->async    = NULL;
 272         irp->params   = *params;
 273         irp->status   = STATUS_PENDING;
 274         irp->result   = 0;
 275         irp->in_size  = in_size;
 276         irp->in_data  = NULL;
 277         irp->out_size = out_size;
 278         irp->out_data = NULL;
 279
 280         if (irp->in_size && !(irp->in_data = memdup( in_data, in_size )))
 281         {
 282             release_object( irp );
 283             irp = NULL;
 284         }
 285     }
 286     return irp;
 287 }
 288
 289 static void set_irp_result( struct irp_call *irp, unsigned int status,
 290                             const void *out_data, data_size_t out_size, data_size_t result )
 291 {
 292     struct device_file *file = irp->file;
 293
 294     if (!file) return;  /* already finished */
 295
 296     /* FIXME: handle the STATUS_PENDING case */
 297     irp->status = status;
 298     irp->result = result;
 299     irp->out_size = min( irp->out_size, out_size );
 300     if (irp->out_size && !(irp->out_data = memdup( out_data, irp->out_size )))
 301         irp->out_size = 0;
 302     irp->file = NULL;
 303     if (irp->async)
 304     {
 305         if (result) status = STATUS_ALERTED;
 306         async_terminate( irp->async, status );
 307         release_object( irp->async );
 308         irp->async = NULL;
 309     }
 310     wake_up( &irp->obj, 0 );
 311
 312     if (status != STATUS_ALERTED)
 313     {
 314         /* remove it from the device queue */
 315         /* (for STATUS_ALERTED this will be done in get_irp_result) */
 316         list_remove( &irp->dev_entry );
 317         release_object( irp );  /* no longer on the device queue */
 318     }
 319     release_object( file );
 320 }
 321
 322
 323 static void device_dump( struct object *obj, int verbose )
 324 {
 325     fputs( "Device\n", stderr );
 326 }
 327
 328 static struct object_type *device_get_type( struct object *obj )
 329 {
 330     static const WCHAR name[] = {'D','e','v','i','c','e'};
 331     static const struct unicode_str str = { name, sizeof(name) };
 332     return get_object_type( &str );
 333 }
 334
 335 static void device_destroy( struct object *obj )
 336 {
 337     struct device *device = (struct device *)obj;
 338
 339     assert( list_empty( &device->files ));
 340
 341     free( device->unix_path );
 342     if (device->manager) list_remove( &device->entry );
 343 }
 344
 345 static void add_irp_to_queue( struct device_file *file, struct irp_call *irp, struct thread *thread )
 346 {
 347     struct device_manager *manager = file->device->manager;
 348
 349     assert( manager );
 350
 351     grab_object( irp );  /* grab reference for queued irp */
 352     irp->thread = thread ? (struct thread *)grab_object( thread ) : NULL;
 353     list_add_tail( &file->requests, &irp->dev_entry );
 354     list_add_tail( &manager->requests, &irp->mgr_entry );
 355     if (list_head( &manager->requests ) == &irp->mgr_entry) wake_up( &manager->obj, 0 );  /* first one */
 356 }
 357
 358 static struct object *device_open_file( struct object *obj, unsigned int access,
 359                                         unsigned int sharing, unsigned int options )
 360 {
 361     struct device *device = (struct device *)obj;
 362     struct device_file *file;
 363
 364     if (!(file = alloc_object( &device_file_ops ))) return NULL;
 365
 366     file->device = (struct device *)grab_object( device );
 367     file->user_ptr = 0;
 368     list_init( &file->requests );
 369     list_add_tail( &device->files, &file->entry );
 370     if (device->unix_path)
 371     {
 372         mode_t mode = 0666;
 373         access = file->obj.ops->map_access( &file->obj, access );
 374         file->fd = open_fd( NULL, device->unix_path, O_NONBLOCK | O_LARGEFILE,
 375                             &mode, access, sharing, options );
 376         if (file->fd) set_fd_user( file->fd, &device_file_fd_ops, &file->obj );
 377     }
 378     else file->fd = alloc_pseudo_fd( &device_file_fd_ops, &file->obj, 0 );
 379
 380     if (!file->fd)
 381     {
 382         release_object( file );
 383         return NULL;
 384     }
 385
 386     if (device->manager)
 387     {
 388         struct irp_call *irp;
 389         irp_params_t params;
 390
 391         memset( &params, 0, sizeof(params) );
 392         params.create.major   = IRP_MJ_CREATE;
 393         params.create.access  = access;
 394         params.create.sharing = sharing;
 395         params.create.options = options;
 396         params.create.device  = file->device->user_ptr;
 397
 398         if ((irp = create_irp( file, &params, NULL, 0, 0 )))
 399         {
 400             add_irp_to_queue( file, irp, NULL );
 401             release_object( irp );
 402         }
 403     }
 404     return &file->obj;
 405 }
 406
 407 static void device_file_dump( struct object *obj, int verbose )
 408 {
 409     struct device_file *file = (struct device_file *)obj;
 410
 411     fprintf( stderr, "File on device %p\n", file->device );
 412 }
 413
 414 static struct fd *device_file_get_fd( struct object *obj )
 415 {
 416     struct device_file *file = (struct device_file *)obj;
 417
 418     return (struct fd *)grab_object( file->fd );
 419 }
 420
 421 static int device_file_close_handle( struct object *obj, struct process *process, obj_handle_t handle )
 422 {
 423     struct device_file *file = (struct device_file *)obj;
 424
 425     if (file->device->manager && obj->handle_count == 1)  /* last handle */
 426     {
 427         struct irp_call *irp;
 428         irp_params_t params;
 429
 430         memset( &params, 0, sizeof(params) );
 431         params.close.major = IRP_MJ_CLOSE;
 432         params.close.file  = file->user_ptr;
 433
 434         if ((irp = create_irp( file, &params, NULL, 0, 0 )))
 435         {
 436             add_irp_to_queue( file, irp, NULL );
 437             release_object( irp );
 438         }
 439     }
 440     return 1;
 441 }
 442
 443 static void device_file_destroy( struct object *obj )
 444 {
 445     struct device_file *file = (struct device_file *)obj;
 446     struct irp_call *irp, *next;
 447
 448     LIST_FOR_EACH_ENTRY_SAFE( irp, next, &file->requests, struct irp_call, dev_entry )
 449     {
 450         list_remove( &irp->dev_entry );
 451         release_object( irp );  /* no longer on the device queue */
 452     }
 453     if (file->fd) release_object( file->fd );
 454     list_remove( &file->entry );
 455     release_object( file->device );
 456 }
 457
 458 static struct irp_call *find_irp_call( struct device_file *file, struct thread *thread,
 459                                        client_ptr_t user_arg )
 460 {
 461     struct irp_call *irp;
 462
 463     LIST_FOR_EACH_ENTRY( irp, &file->requests, struct irp_call, dev_entry )
 464         if (irp->thread == thread && irp->user_arg == user_arg) return irp;
 465
 466     set_error( STATUS_INVALID_PARAMETER );
 467     return NULL;
 468 }
 469
 470 static void set_file_user_ptr( struct device_file *file, client_ptr_t ptr )
 471 {
 472     struct irp_call *irp;
 473
 474     if (file->user_ptr == ptr) return;  /* nothing to do */
 475
 476     file->user_ptr = ptr;
 477
 478     /* update already queued irps */
 479
 480     LIST_FOR_EACH_ENTRY( irp, &file->requests, struct irp_call, dev_entry )
 481     {
 482         switch (irp->params.major)
 483         {
 484         case IRP_MJ_CLOSE:          irp->params.close.file = ptr; break;
 485         case IRP_MJ_READ:           irp->params.read.file  = ptr; break;
 486         case IRP_MJ_WRITE:          irp->params.write.file = ptr; break;
 487         case IRP_MJ_FLUSH_BUFFERS:  irp->params.flush.file = ptr; break;
 488         case IRP_MJ_DEVICE_CONTROL: irp->params.ioctl.file = ptr; break;
 489         }
 490     }
 491 }
 492
 493 /* queue an irp to the device */
 494 static obj_handle_t queue_irp( struct device_file *file, struct irp_call *irp,
 495                                const async_data_t *async_data, int blocking )
 496 {
 497     obj_handle_t handle = 0;
 498
 499     if (blocking && !(handle = alloc_handle( current->process, irp, SYNCHRONIZE, 0 ))) return 0;
 500
 501     if (!(irp->async = fd_queue_async( file->fd, async_data, ASYNC_TYPE_WAIT )))
 502     {
 503         if (handle) close_handle( current->process, handle );
 504         return 0;
 505     }
 506     irp->user_arg = async_data->arg;
 507     add_irp_to_queue( file, irp, current );
 508     set_error( STATUS_PENDING );
 509     return handle;
 510 }
 511
 512 static enum server_fd_type device_file_get_fd_type( struct fd *fd )
 513 {
 514     return FD_TYPE_DEVICE;
 515 }
 516
 517 static obj_handle_t device_file_read( struct fd *fd, const async_data_t *async_data, int blocking,
 518                                       file_pos_t pos )
 519 {
 520     struct device_file *file = get_fd_user( fd );
 521     struct irp_call *irp;
 522     obj_handle_t handle;
 523     irp_params_t params;
 524
 525     memset( &params, 0, sizeof(params) );
 526     params.read.major = IRP_MJ_READ;
 527     params.read.key   = 0;
 528     params.read.pos   = pos;
 529     params.read.file  = file->user_ptr;
 530
 531     irp = create_irp( file, &params, NULL, 0, get_reply_max_size() );
 532     if (!irp) return 0;
 533
 534     handle = queue_irp( file, irp, async_data, blocking );
 535     release_object( irp );
 536     return handle;
 537 }
 538
 539 static obj_handle_t device_file_write( struct fd *fd, const async_data_t *async_data, int blocking,
 540                                        file_pos_t pos, data_size_t *written )
 541 {
 542     struct device_file *file = get_fd_user( fd );
 543     struct irp_call *irp;
 544     obj_handle_t handle;
 545     irp_params_t params;
 546
 547     memset( &params, 0, sizeof(params) );
 548     params.write.major = IRP_MJ_WRITE;
 549     params.write.key   = 0;
 550     params.write.pos   = pos;
 551     params.write.file  = file->user_ptr;
 552
 553     irp = create_irp( file, &params, get_req_data(), get_req_data_size(), 0 );
 554     if (!irp) return 0;
 555
 556     handle = queue_irp( file, irp, async_data, blocking );
 557     release_object( irp );
 558     return handle;
 559 }
 560
 561 static obj_handle_t device_file_flush( struct fd *fd, const async_data_t *async_data, int blocking )
 562 {
 563     struct device_file *file = get_fd_user( fd );
 564     struct irp_call *irp;
 565     obj_handle_t handle;
 566     irp_params_t params;
 567
 568     memset( &params, 0, sizeof(params) );
 569     params.flush.major = IRP_MJ_FLUSH_BUFFERS;
 570     params.flush.file  = file->user_ptr;
 571
 572     irp = create_irp( file, &params, NULL, 0, 0 );
 573     if (!irp) return 0;
 574
 575     handle = queue_irp( file, irp, async_data, blocking );
 576     release_object( irp );
 577     return handle;
 578 }
 579
 580 static obj_handle_t device_file_ioctl( struct fd *fd, ioctl_code_t code, const async_data_t *async_data,
 581                                        int blocking )
 582 {
 583     struct device_file *file = get_fd_user( fd );
 584     struct irp_call *irp;
 585     obj_handle_t handle;
 586     irp_params_t params;
 587
 588     memset( &params, 0, sizeof(params) );
 589     params.ioctl.major = IRP_MJ_DEVICE_CONTROL;
 590     params.ioctl.code  = code;
 591     params.ioctl.file = file->user_ptr;
 592
 593     irp = create_irp( file, &params, get_req_data(), get_req_data_size(),
 594                       get_reply_max_size() );
 595     if (!irp) return 0;
 596
 597     handle = queue_irp( file, irp, async_data, blocking );
 598     release_object( irp );
 599     return handle;
 600 }
 601
 602 static struct device *create_device( struct object *root, const struct unicode_str *name,
 603                                      struct device_manager *manager, unsigned int attr )
 604 {
 605     struct device *device;
 606
 607     if ((device = create_named_object( root, &device_ops, name, attr, NULL )))
 608     {
 609         if (get_error() != STATUS_OBJECT_NAME_EXISTS)
 610         {
 611             /* initialize it if it didn't already exist */
 612             device->unix_path = NULL;
 613             device->manager = manager;
 614             list_add_tail( &manager->devices, &device->entry );
 615             list_init( &device->files );
 616         }
 617     }
 618     return device;
 619 }
 620
 621 struct object *create_unix_device( struct object *root, const struct unicode_str *name,
 622                                    const char *unix_path )
 623 {
 624     struct device *device;
 625
 626     if ((device = create_named_object( root, &device_ops, name, 0, NULL )))
 627     {
 628         device->unix_path = strdup( unix_path );
 629         device->manager = NULL;  /* no manager, requests go straight to the Unix device */
 630         list_init( &device->files );
 631     }
 632     return &device->obj;
 633
 634 }
 635
 636 /* terminate requests when the underlying device is deleted */
 637 static void delete_file( struct device_file *file )
 638 {
 639     struct irp_call *irp, *next;
 640
 641     /* terminate all pending requests */
 642     LIST_FOR_EACH_ENTRY_SAFE( irp, next, &file->requests, struct irp_call, dev_entry )
 643     {
 644         list_remove( &irp->mgr_entry );
 645         set_irp_result( irp, STATUS_FILE_DELETED, NULL, 0, 0 );
 646     }
 647 }
 648
 649 static void delete_device( struct device *device )
 650 {
 651     struct device_file *file, *next;
 652
 653     if (!device->manager) return;  /* already deleted */
 654
 655     LIST_FOR_EACH_ENTRY_SAFE( file, next, &device->files, struct device_file, entry )
 656         delete_file( file );
 657
 658     unlink_named_object( &device->obj );
 659     list_remove( &device->entry );
 660     device->manager = NULL;
 661 }
 662
 663
 664 static void device_manager_dump( struct object *obj, int verbose )
 665 {
 666     fprintf( stderr, "Device manager\n" );
 667 }
 668
 669 static int device_manager_signaled( struct object *obj, struct wait_queue_entry *entry )
 670 {
 671     struct device_manager *manager = (struct device_manager *)obj;
 672
 673     return !list_empty( &manager->requests );
 674 }
 675
 676 static void device_manager_destroy( struct object *obj )
 677 {
 678     struct device_manager *manager = (struct device_manager *)obj;
 679     struct list *ptr;
 680
 681     while ((ptr = list_head( &manager->devices )))
 682     {
 683         struct device *device = LIST_ENTRY( ptr, struct device, entry );
 684         delete_device( device );
 685     }
 686 }
 687
 688 static struct device_manager *create_device_manager(void)
 689 {
 690     struct device_manager *manager;
 691
 692     if ((manager = alloc_object( &device_manager_ops )))
 693     {
 694         list_init( &manager->devices );
 695         list_init( &manager->requests );
 696     }
 697     return manager;
 698 }
 699
 700
 701 /* create a device manager */
 702 DECL_HANDLER(create_device_manager)
 703 {
 704     struct device_manager *manager = create_device_manager();
 705
 706     if (manager)
 707     {
 708         reply->handle = alloc_handle( current->process, manager, req->access, req->attributes );
 709         release_object( manager );
 710     }
 711 }
 712
 713
 714 /* create a device */
 715 DECL_HANDLER(create_device)
 716 {
 717     struct device *device;
 718     struct unicode_str name = get_req_unicode_str();
 719     struct device_manager *manager;
 720     struct object *root = NULL;
 721
 722     if (!(manager = (struct device_manager *)get_handle_obj( current->process, req->manager,
 723                                                              0, &device_manager_ops )))
 724         return;
 725
 726     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir )))
 727     {
 728         release_object( manager );
 729         return;
 730     }
 731
 732     if ((device = create_device( root, &name, manager, req->attributes )))
 733     {
 734         device->user_ptr = req->user_ptr;
 735         reply->handle = alloc_handle( current->process, device, req->access, req->attributes );
 736         release_object( device );
 737     }
 738
 739     if (root) release_object( root );
 740     release_object( manager );
 741 }
 742
 743
 744 /* delete a device */
 745 DECL_HANDLER(delete_device)
 746 {
 747     struct device *device;
 748
 749     if ((device = (struct device *)get_handle_obj( current->process, req->handle, 0, &device_ops )))
 750     {
 751         delete_device( device );
 752         release_object( device );
 753     }
 754 }
 755
 756
 757 /* retrieve the next pending device irp request */
 758 DECL_HANDLER(get_next_device_request)
 759 {
 760     struct irp_call *irp;
 761     struct device_manager *manager;
 762     struct list *ptr;
 763
 764     reply->params.major = IRP_MJ_MAXIMUM_FUNCTION + 1;
 765
 766     if (!(manager = (struct device_manager *)get_handle_obj( current->process, req->manager,
 767                                                              0, &device_manager_ops )))
 768         return;
 769
 770     if (req->prev)
 771     {
 772         if ((irp = (struct irp_call *)get_handle_obj( current->process, req->prev, 0, &irp_call_ops )))
 773         {
 774             set_irp_result( irp, req->status, NULL, 0, 0 );
 775             close_handle( current->process, req->prev );  /* avoid an extra round-trip for close */
 776             release_object( irp );
 777         }
 778         clear_error();
 779     }
 780
 781     if ((ptr = list_head( &manager->requests )))
 782     {
 783         irp = LIST_ENTRY( ptr, struct irp_call, mgr_entry );
 784         if (irp->thread)
 785         {
 786             reply->client_pid = get_process_id( irp->thread->process );
 787             reply->client_tid = get_thread_id( irp->thread );
 788         }
 789         reply->params = irp->params;
 790         reply->in_size = irp->in_size;
 791         reply->out_size = irp->out_size;
 792         if (irp->in_size > get_reply_max_size()) set_error( STATUS_BUFFER_OVERFLOW );
 793         else if ((reply->next = alloc_handle( current->process, irp, 0, 0 )))
 794         {
 795             set_reply_data_ptr( irp->in_data, irp->in_size );
 796             irp->in_data = NULL;
 797             irp->in_size = 0;
 798             list_remove( &irp->mgr_entry );
 799             list_init( &irp->mgr_entry );
 800         }
 801     }
 802     else set_error( STATUS_PENDING );
 803
 804     release_object( manager );
 805 }
 806
 807
 808 /* store results of an async irp */
 809 DECL_HANDLER(set_irp_result)
 810 {
 811     struct irp_call *irp;
 812
 813     if ((irp = (struct irp_call *)get_handle_obj( current->process, req->handle, 0, &irp_call_ops )))
 814     {
 815         if (irp->file) set_file_user_ptr( irp->file, req->file_ptr );
 816         set_irp_result( irp, req->status, get_req_data(), get_req_data_size(), req->size );
 817         close_handle( current->process, req->handle );  /* avoid an extra round-trip for close */
 818         release_object( irp );
 819     }
 820 }
 821
 822
 823 /* retrieve results of an async irp */
 824 DECL_HANDLER(get_irp_result)
 825 {
 826     struct device_file *file;
 827     struct irp_call *irp;
 828
 829     if (!(file = (struct device_file *)get_handle_obj( current->process, req->handle,
 830                                                        0, &device_file_ops )))
 831         return;
 832
 833     if ((irp = find_irp_call( file, current, req->user_arg )))
 834     {
 835         if (irp->out_data)
 836         {
 837             data_size_t size = min( irp->out_size, get_reply_max_size() );
 838             if (size)
 839             {
 840                 set_reply_data_ptr( irp->out_data, size );
 841                 irp->out_data = NULL;
 842             }
 843         }
 844         reply->size = irp->result;
 845         set_error( irp->status );
 846         list_remove( &irp->dev_entry );
 847         release_object( irp );  /* no longer on the device queue */
 848     }
 849     release_object( file );
 850 }