server/named_pipe.c

   1 /*
   2  * Server-side pipe management
   3  *
   4  * Copyright (C) 1998 Alexandre Julliard
   5  * Copyright (C) 2001 Mike McCormack
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  *
  21  * TODO:
  22  *   message mode
  23  */
  24
  25 #include "config.h"
  26 #include "wine/port.h"
  27
  28 #include <assert.h>
  29 #include <fcntl.h>
  30 #include <string.h>
  31 #include <stdarg.h>
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34 #include <sys/time.h>
  35 #include <sys/types.h>
  36 #ifdef HAVE_SYS_SOCKET_H
  37 #include <sys/socket.h>
  38 #endif
  39 #include <time.h>
  40 #include <unistd.h>
  41 #ifdef HAVE_POLL_H
  42 #include <poll.h>
  43 #endif
  44
  45 #include "ntstatus.h"
  46 #define WIN32_NO_STATUS
  47 #include "windef.h"
  48 #include "winternl.h"
  49 #include "winioctl.h"
  50
  51 #include "file.h"
  52 #include "handle.h"
  53 #include "thread.h"
  54 #include "request.h"
  55
  56 enum pipe_state
  57 {
  58     ps_idle_server,
  59     ps_wait_open,
  60     ps_connected_server,
  61     ps_wait_disconnect,
  62     ps_disconnected_server,
  63     ps_wait_connect
  64 };
  65
  66 struct named_pipe;
  67
  68 struct pipe_server
  69 {
  70     struct object        obj;        /* object header */
  71     struct fd           *fd;         /* pipe file descriptor */
  72     struct fd           *ioctl_fd;   /* file descriptor for ioctls when not connected */
  73     struct list          entry;      /* entry in named pipe servers list */
  74     enum pipe_state      state;      /* server state */
  75     struct pipe_client  *client;     /* client that this server is connected to */
  76     struct named_pipe   *pipe;
  77     struct timeout_user *flush_poll;
  78     struct event        *event;
  79     unsigned int         options;    /* pipe options */
  80 };
  81
  82 struct pipe_client
  83 {
  84     struct object        obj;        /* object header */
  85     struct fd           *fd;         /* pipe file descriptor */
  86     struct pipe_server  *server;     /* server that this client is connected to */
  87     unsigned int         flags;      /* file flags */
  88 };
  89
  90 struct named_pipe
  91 {
  92     struct object       obj;         /* object header */
  93     unsigned int        flags;
  94     unsigned int        sharing;
  95     unsigned int        maxinstances;
  96     unsigned int        outsize;
  97     unsigned int        insize;
  98     unsigned int        instances;
  99     timeout_t           timeout;
 100     struct list         servers;     /* list of servers using this pipe */
 101     struct async_queue *waiters;     /* list of clients waiting to connect */
 102 };
 103
 104 struct named_pipe_device
 105 {
 106     struct object       obj;         /* object header */
 107     struct fd          *fd;          /* pseudo-fd for ioctls */
 108     struct namespace   *pipes;       /* named pipe namespace */
 109 };
 110
 111 static void named_pipe_dump( struct object *obj, int verbose );
 112 static unsigned int named_pipe_map_access( struct object *obj, unsigned int access );
 113 static struct object *named_pipe_open_file( struct object *obj, unsigned int access,
 114                                             unsigned int sharing, unsigned int options );
 115 static void named_pipe_destroy( struct object *obj );
 116
 117 static const struct object_ops named_pipe_ops =
 118 {
 119     sizeof(struct named_pipe),    /* size */
 120     named_pipe_dump,              /* dump */
 121     no_get_type,                  /* get_type */
 122     no_add_queue,                 /* add_queue */
 123     NULL,                         /* remove_queue */
 124     NULL,                         /* signaled */
 125     NULL,                         /* satisfied */
 126     no_signal,                    /* signal */
 127     no_get_fd,                    /* get_fd */
 128     named_pipe_map_access,        /* map_access */
 129     default_get_sd,               /* get_sd */
 130     default_set_sd,               /* set_sd */
 131     no_lookup_name,               /* lookup_name */
 132     named_pipe_open_file,         /* open_file */
 133     no_close_handle,              /* close_handle */
 134     named_pipe_destroy            /* destroy */
 135 };
 136
 137 /* server end functions */
 138 static void pipe_server_dump( struct object *obj, int verbose );
 139 static struct fd *pipe_server_get_fd( struct object *obj );
 140 static void pipe_server_destroy( struct object *obj);
 141 static void pipe_server_flush( struct fd *fd, struct event **event );
 142 static enum server_fd_type pipe_server_get_fd_type( struct fd *fd );
 143 static obj_handle_t pipe_server_ioctl( struct fd *fd, ioctl_code_t code, const async_data_t *async,
 144                                        int blocking, const void *data, data_size_t size );
 145
 146 static const struct object_ops pipe_server_ops =
 147 {
 148     sizeof(struct pipe_server),   /* size */
 149     pipe_server_dump,             /* dump */
 150     no_get_type,                  /* get_type */
 151     add_queue,                    /* add_queue */
 152     remove_queue,                 /* remove_queue */
 153     default_fd_signaled,          /* signaled */
 154     no_satisfied,                 /* satisfied */
 155     no_signal,                    /* signal */
 156     pipe_server_get_fd,           /* get_fd */
 157     default_fd_map_access,        /* map_access */
 158     default_get_sd,               /* get_sd */
 159     default_set_sd,               /* set_sd */
 160     no_lookup_name,               /* lookup_name */
 161     no_open_file,                 /* open_file */
 162     fd_close_handle,              /* close_handle */
 163     pipe_server_destroy           /* destroy */
 164 };
 165
 166 static const struct fd_ops pipe_server_fd_ops =
 167 {
 168     default_fd_get_poll_events,   /* get_poll_events */
 169     default_poll_event,           /* poll_event */
 170     pipe_server_flush,            /* flush */
 171     pipe_server_get_fd_type,      /* get_fd_type */
 172     pipe_server_ioctl,            /* ioctl */
 173     default_fd_queue_async,       /* queue_async */
 174     default_fd_reselect_async,    /* reselect_async */
 175     default_fd_cancel_async,      /* cancel_async */
 176 };
 177
 178 /* client end functions */
 179 static void pipe_client_dump( struct object *obj, int verbose );
 180 static int pipe_client_signaled( struct object *obj, struct wait_queue_entry *entry );
 181 static struct fd *pipe_client_get_fd( struct object *obj );
 182 static void pipe_client_destroy( struct object *obj );
 183 static void pipe_client_flush( struct fd *fd, struct event **event );
 184 static enum server_fd_type pipe_client_get_fd_type( struct fd *fd );
 185
 186 static const struct object_ops pipe_client_ops =
 187 {
 188     sizeof(struct pipe_client),   /* size */
 189     pipe_client_dump,             /* dump */
 190     no_get_type,                  /* get_type */
 191     add_queue,                    /* add_queue */
 192     remove_queue,                 /* remove_queue */
 193     pipe_client_signaled,         /* signaled */
 194     no_satisfied,                 /* satisfied */
 195     no_signal,                    /* signal */
 196     pipe_client_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_open_file,                 /* open_file */
 202     fd_close_handle,              /* close_handle */
 203     pipe_client_destroy           /* destroy */
 204 };
 205
 206 static const struct fd_ops pipe_client_fd_ops =
 207 {
 208     default_fd_get_poll_events,   /* get_poll_events */
 209     default_poll_event,           /* poll_event */
 210     pipe_client_flush,            /* flush */
 211     pipe_client_get_fd_type,      /* get_fd_type */
 212     default_fd_ioctl,             /* ioctl */
 213     default_fd_queue_async,       /* queue_async */
 214     default_fd_reselect_async,    /* reselect_async */
 215     default_fd_cancel_async       /* cancel_async */
 216 };
 217
 218 static void named_pipe_device_dump( struct object *obj, int verbose );
 219 static struct object_type *named_pipe_device_get_type( struct object *obj );
 220 static struct fd *named_pipe_device_get_fd( struct object *obj );
 221 static struct object *named_pipe_device_lookup_name( struct object *obj,
 222     struct unicode_str *name, unsigned int attr );
 223 static struct object *named_pipe_device_open_file( struct object *obj, unsigned int access,
 224                                                    unsigned int sharing, unsigned int options );
 225 static void named_pipe_device_destroy( struct object *obj );
 226 static enum server_fd_type named_pipe_device_get_fd_type( struct fd *fd );
 227 static obj_handle_t named_pipe_device_ioctl( struct fd *fd, ioctl_code_t code, const async_data_t *async_data,
 228                                              int blocking, const void *data, data_size_t size );
 229
 230 static const struct object_ops named_pipe_device_ops =
 231 {
 232     sizeof(struct named_pipe_device), /* size */
 233     named_pipe_device_dump,           /* dump */
 234     named_pipe_device_get_type,       /* get_type */
 235     no_add_queue,                     /* add_queue */
 236     NULL,                             /* remove_queue */
 237     NULL,                             /* signaled */
 238     no_satisfied,                     /* satisfied */
 239     no_signal,                        /* signal */
 240     named_pipe_device_get_fd,         /* get_fd */
 241     no_map_access,                    /* map_access */
 242     default_get_sd,                   /* get_sd */
 243     default_set_sd,                   /* set_sd */
 244     named_pipe_device_lookup_name,    /* lookup_name */
 245     named_pipe_device_open_file,      /* open_file */
 246     fd_close_handle,                  /* close_handle */
 247     named_pipe_device_destroy         /* destroy */
 248 };
 249
 250 static const struct fd_ops named_pipe_device_fd_ops =
 251 {
 252     default_fd_get_poll_events,       /* get_poll_events */
 253     default_poll_event,               /* poll_event */
 254     no_flush,                         /* flush */
 255     named_pipe_device_get_fd_type,    /* get_fd_type */
 256     named_pipe_device_ioctl,          /* ioctl */
 257     default_fd_queue_async,           /* queue_async */
 258     default_fd_reselect_async,        /* reselect_async */
 259     default_fd_cancel_async           /* cancel_async */
 260 };
 261
 262 static void named_pipe_dump( struct object *obj, int verbose )
 263 {
 264     struct named_pipe *pipe = (struct named_pipe *) obj;
 265     assert( obj->ops == &named_pipe_ops );
 266     fprintf( stderr, "Named pipe " );
 267     dump_object_name( &pipe->obj );
 268     fprintf( stderr, "\n" );
 269 }
 270
 271 static unsigned int named_pipe_map_access( struct object *obj, unsigned int access )
 272 {
 273     if (access & GENERIC_READ)    access |= STANDARD_RIGHTS_READ;
 274     if (access & GENERIC_WRITE)   access |= STANDARD_RIGHTS_WRITE | FILE_CREATE_PIPE_INSTANCE;
 275     if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE;
 276     if (access & GENERIC_ALL)     access |= STANDARD_RIGHTS_ALL;
 277     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 278 }
 279
 280 static void pipe_server_dump( struct object *obj, int verbose )
 281 {
 282     struct pipe_server *server = (struct pipe_server *) obj;
 283     assert( obj->ops == &pipe_server_ops );
 284     fprintf( stderr, "Named pipe server pipe=%p state=%d\n", server->pipe, server->state );
 285 }
 286
 287 static void pipe_client_dump( struct object *obj, int verbose )
 288 {
 289     struct pipe_client *client = (struct pipe_client *) obj;
 290     assert( obj->ops == &pipe_client_ops );
 291     fprintf( stderr, "Named pipe client server=%p\n", client->server );
 292 }
 293
 294 static int pipe_client_signaled( struct object *obj, struct wait_queue_entry *entry )
 295 {
 296     struct pipe_client *client = (struct pipe_client *) obj;
 297
 298     return client->fd && is_fd_signaled(client->fd);
 299 }
 300
 301 static void named_pipe_destroy( struct object *obj)
 302 {
 303     struct named_pipe *pipe = (struct named_pipe *) obj;
 304
 305     assert( list_empty( &pipe->servers ) );
 306     assert( !pipe->instances );
 307     free_async_queue( pipe->waiters );
 308 }
 309
 310 static struct fd *pipe_client_get_fd( struct object *obj )
 311 {
 312     struct pipe_client *client = (struct pipe_client *) obj;
 313     if (client->fd)
 314         return (struct fd *) grab_object( client->fd );
 315     set_error( STATUS_PIPE_DISCONNECTED );
 316     return NULL;
 317 }
 318
 319 static void set_server_state( struct pipe_server *server, enum pipe_state state )
 320 {
 321     server->state = state;
 322
 323     switch(state)
 324     {
 325     case ps_connected_server:
 326     case ps_wait_disconnect:
 327         assert( server->fd );
 328         break;
 329     case ps_wait_open:
 330     case ps_idle_server:
 331         assert( !server->fd );
 332         set_no_fd_status( server->ioctl_fd, STATUS_PIPE_LISTENING );
 333         break;
 334     case ps_disconnected_server:
 335     case ps_wait_connect:
 336         assert( !server->fd );
 337         set_no_fd_status( server->ioctl_fd, STATUS_PIPE_DISCONNECTED );
 338         break;
 339     }
 340 }
 341
 342 static struct fd *pipe_server_get_fd( struct object *obj )
 343 {
 344     struct pipe_server *server = (struct pipe_server *) obj;
 345
 346     return (struct fd *)grab_object( server->fd ? server->fd : server->ioctl_fd );
 347 }
 348
 349
 350 static void notify_empty( struct pipe_server *server )
 351 {
 352     if (!server->flush_poll)
 353         return;
 354     assert( server->state == ps_connected_server );
 355     assert( server->event );
 356     remove_timeout_user( server->flush_poll );
 357     server->flush_poll = NULL;
 358     set_event( server->event );
 359     release_object( server->event );
 360     server->event = NULL;
 361 }
 362
 363 static void do_disconnect( struct pipe_server *server )
 364 {
 365     /* we may only have a server fd, if the client disconnected */
 366     if (server->client)
 367     {
 368         assert( server->client->server == server );
 369         assert( server->client->fd );
 370         release_object( server->client->fd );
 371         server->client->fd = NULL;
 372     }
 373     assert( server->fd );
 374     shutdown( get_unix_fd( server->fd ), SHUT_RDWR );
 375     release_object( server->fd );
 376     server->fd = NULL;
 377 }
 378
 379 static void pipe_server_destroy( struct object *obj)
 380 {
 381     struct pipe_server *server = (struct pipe_server *)obj;
 382
 383     assert( obj->ops == &pipe_server_ops );
 384
 385     if (server->fd)
 386     {
 387         notify_empty( server );
 388         do_disconnect( server );
 389     }
 390
 391     if (server->client)
 392     {
 393         server->client->server = NULL;
 394         server->client = NULL;
 395     }
 396
 397     assert( server->pipe->instances );
 398     server->pipe->instances--;
 399
 400     if (server->ioctl_fd) release_object( server->ioctl_fd );
 401     list_remove( &server->entry );
 402     release_object( server->pipe );
 403 }
 404
 405 static void pipe_client_destroy( struct object *obj)
 406 {
 407     struct pipe_client *client = (struct pipe_client *)obj;
 408     struct pipe_server *server = client->server;
 409
 410     assert( obj->ops == &pipe_client_ops );
 411
 412     if (server)
 413     {
 414         notify_empty( server );
 415
 416         switch(server->state)
 417         {
 418         case ps_connected_server:
 419             /* Don't destroy the server's fd here as we can't
 420                do a successful flush without it. */
 421             set_server_state( server, ps_wait_disconnect );
 422             break;
 423         case ps_disconnected_server:
 424             set_server_state( server, ps_wait_connect );
 425             break;
 426         case ps_idle_server:
 427         case ps_wait_open:
 428         case ps_wait_disconnect:
 429         case ps_wait_connect:
 430             assert( 0 );
 431         }
 432         assert( server->client );
 433         server->client = NULL;
 434         client->server = NULL;
 435     }
 436     if (client->fd) release_object( client->fd );
 437 }
 438
 439 static void named_pipe_device_dump( struct object *obj, int verbose )
 440 {
 441     assert( obj->ops == &named_pipe_device_ops );
 442     fprintf( stderr, "Named pipe device\n" );
 443 }
 444
 445 static struct object_type *named_pipe_device_get_type( struct object *obj )
 446 {
 447     static const WCHAR name[] = {'D','e','v','i','c','e'};
 448     static const struct unicode_str str = { name, sizeof(name) };
 449     return get_object_type( &str );
 450 }
 451
 452 static struct fd *named_pipe_device_get_fd( struct object *obj )
 453 {
 454     struct named_pipe_device *device = (struct named_pipe_device *)obj;
 455     return (struct fd *)grab_object( device->fd );
 456 }
 457
 458 static struct object *named_pipe_device_lookup_name( struct object *obj, struct unicode_str *name,
 459                                                      unsigned int attr )
 460 {
 461     struct named_pipe_device *device = (struct named_pipe_device*)obj;
 462     struct object *found;
 463
 464     assert( obj->ops == &named_pipe_device_ops );
 465     assert( device->pipes );
 466
 467     if ((found = find_object( device->pipes, name, attr | OBJ_CASE_INSENSITIVE )))
 468         name->len = 0;
 469
 470     return found;
 471 }
 472
 473 static struct object *named_pipe_device_open_file( struct object *obj, unsigned int access,
 474                                                    unsigned int sharing, unsigned int options )
 475 {
 476     return grab_object( obj );
 477 }
 478
 479 static void named_pipe_device_destroy( struct object *obj )
 480 {
 481     struct named_pipe_device *device = (struct named_pipe_device*)obj;
 482     assert( obj->ops == &named_pipe_device_ops );
 483     if (device->fd) release_object( device->fd );
 484     free( device->pipes );
 485 }
 486
 487 static enum server_fd_type named_pipe_device_get_fd_type( struct fd *fd )
 488 {
 489     return FD_TYPE_DEVICE;
 490 }
 491
 492 void create_named_pipe_device( struct directory *root, const struct unicode_str *name )
 493 {
 494     struct named_pipe_device *dev;
 495
 496     if ((dev = create_named_object_dir( root, name, 0, &named_pipe_device_ops )) &&
 497         get_error() != STATUS_OBJECT_NAME_EXISTS)
 498     {
 499         dev->pipes = NULL;
 500         if (!(dev->fd = alloc_pseudo_fd( &named_pipe_device_fd_ops, &dev->obj, 0 )) ||
 501             !(dev->pipes = create_namespace( 7 )))
 502         {
 503             release_object( dev );
 504             dev = NULL;
 505         }
 506     }
 507     if (dev) make_object_static( &dev->obj );
 508 }
 509
 510 static int pipe_data_remaining( struct pipe_server *server )
 511 {
 512     struct pollfd pfd;
 513     int fd;
 514
 515     assert( server->client );
 516
 517     fd = get_unix_fd( server->client->fd );
 518     if (fd < 0)
 519         return 0;
 520     pfd.fd = fd;
 521     pfd.events = POLLIN;
 522     pfd.revents = 0;
 523
 524     if (0 > poll( &pfd, 1, 0 ))
 525         return 0;
 526
 527     return pfd.revents&POLLIN;
 528 }
 529
 530 static void check_flushed( void *arg )
 531 {
 532     struct pipe_server *server = (struct pipe_server*) arg;
 533
 534     assert( server->event );
 535     if (pipe_data_remaining( server ))
 536     {
 537         server->flush_poll = add_timeout_user( -TICKS_PER_SEC / 10, check_flushed, server );
 538     }
 539     else
 540     {
 541         /* notify_empty( server ); */
 542         server->flush_poll = NULL;
 543         set_event( server->event );
 544         release_object( server->event );
 545         server->event = NULL;
 546     }
 547 }
 548
 549 static void pipe_server_flush( struct fd *fd, struct event **event )
 550 {
 551     struct pipe_server *server = get_fd_user( fd );
 552
 553     if (!server || server->state != ps_connected_server) return;
 554
 555     /* FIXME: if multiple threads flush the same pipe,
 556               maybe should create a list of processes to notify */
 557     if (server->flush_poll) return;
 558
 559     if (pipe_data_remaining( server ))
 560     {
 561         /* this kind of sux -
 562            there's no unix way to be alerted when a pipe becomes empty */
 563         server->event = create_event( NULL, NULL, 0, 0, 0, NULL );
 564         if (!server->event) return;
 565         server->flush_poll = add_timeout_user( -TICKS_PER_SEC / 10, check_flushed, server );
 566         *event = server->event;
 567     }
 568 }
 569
 570 static void pipe_client_flush( struct fd *fd, struct event **event )
 571 {
 572     /* FIXME: what do we have to do for this? */
 573 }
 574
 575 static inline int is_overlapped( unsigned int options )
 576 {
 577     return !(options & (FILE_SYNCHRONOUS_IO_ALERT | FILE_SYNCHRONOUS_IO_NONALERT));
 578 }
 579
 580 static enum server_fd_type pipe_server_get_fd_type( struct fd *fd )
 581 {
 582     return FD_TYPE_PIPE;
 583 }
 584
 585 static enum server_fd_type pipe_client_get_fd_type( struct fd *fd )
 586 {
 587     return FD_TYPE_PIPE;
 588 }
 589
 590 static obj_handle_t alloc_wait_event( struct process *process )
 591 {
 592     obj_handle_t handle = 0;
 593     struct event *event = create_event( NULL, NULL, 0, 1, 0, NULL );
 594
 595     if (event)
 596     {
 597         handle = alloc_handle( process, event, EVENT_ALL_ACCESS, 0 );
 598         release_object( event );
 599     }
 600     return handle;
 601 }
 602
 603 static obj_handle_t pipe_server_ioctl( struct fd *fd, ioctl_code_t code, const async_data_t *async_data,
 604                                        int blocking, const void *data, data_size_t size )
 605 {
 606     struct pipe_server *server = get_fd_user( fd );
 607     struct async *async;
 608     obj_handle_t wait_handle = 0;
 609
 610     switch(code)
 611     {
 612     case FSCTL_PIPE_LISTEN:
 613         switch(server->state)
 614         {
 615         case ps_idle_server:
 616         case ps_wait_connect:
 617             if (blocking)
 618             {
 619                 async_data_t new_data = *async_data;
 620                 if (!(wait_handle = alloc_wait_event( current->process ))) break;
 621                 new_data.event = wait_handle;
 622                 if (!(async = fd_queue_async( server->ioctl_fd, &new_data, ASYNC_TYPE_WAIT )))
 623                 {
 624                     close_handle( current->process, wait_handle );
 625                     break;
 626                 }
 627             }
 628             else async = fd_queue_async( server->ioctl_fd, async_data, ASYNC_TYPE_WAIT );
 629
 630             if (async)
 631             {
 632                 set_server_state( server, ps_wait_open );
 633                 if (server->pipe->waiters) async_wake_up( server->pipe->waiters, STATUS_SUCCESS );
 634                 release_object( async );
 635                 set_error( STATUS_PENDING );
 636                 return wait_handle;
 637             }
 638             break;
 639         case ps_connected_server:
 640             set_error( STATUS_PIPE_CONNECTED );
 641             break;
 642         case ps_disconnected_server:
 643             set_error( STATUS_PIPE_BUSY );
 644             break;
 645         case ps_wait_disconnect:
 646             set_error( STATUS_NO_DATA_DETECTED );
 647             break;
 648         case ps_wait_open:
 649             set_error( STATUS_INVALID_HANDLE );
 650             break;
 651         }
 652         return 0;
 653
 654     case FSCTL_PIPE_DISCONNECT:
 655         switch(server->state)
 656         {
 657         case ps_connected_server:
 658             assert( server->client );
 659             assert( server->client->fd );
 660
 661             notify_empty( server );
 662
 663             /* dump the client and server fds, but keep the pointers
 664                around - client loses all waiting data */
 665             do_disconnect( server );
 666             set_server_state( server, ps_disconnected_server );
 667             break;
 668         case ps_wait_disconnect:
 669             assert( !server->client );
 670             do_disconnect( server );
 671             set_server_state( server, ps_wait_connect );
 672             break;
 673         case ps_idle_server:
 674         case ps_wait_open:
 675             set_error( STATUS_PIPE_LISTENING );
 676             break;
 677         case ps_disconnected_server:
 678         case ps_wait_connect:
 679             set_error( STATUS_PIPE_DISCONNECTED );
 680             break;
 681         }
 682         return 0;
 683
 684     default:
 685         return default_fd_ioctl( fd, code, async_data, blocking, data, size );
 686     }
 687 }
 688
 689 static struct named_pipe *create_named_pipe( struct directory *root, const struct unicode_str *name,
 690                                              unsigned int attr )
 691 {
 692     struct object *obj;
 693     struct named_pipe *pipe = NULL;
 694     struct unicode_str new_name;
 695
 696     if (!name || !name->len) return alloc_object( &named_pipe_ops );
 697
 698     if (!(obj = find_object_dir( root, name, attr, &new_name )))
 699     {
 700         set_error( STATUS_OBJECT_NAME_INVALID );
 701         return NULL;
 702     }
 703     if (!new_name.len)
 704     {
 705         if (attr & OBJ_OPENIF && obj->ops == &named_pipe_ops)
 706             set_error( STATUS_OBJECT_NAME_EXISTS );
 707         else
 708         {
 709             release_object( obj );
 710             obj = NULL;
 711             if (attr & OBJ_OPENIF)
 712                 set_error( STATUS_OBJECT_TYPE_MISMATCH );
 713             else
 714                 set_error( STATUS_OBJECT_NAME_COLLISION );
 715         }
 716         return (struct named_pipe *)obj;
 717     }
 718
 719     if (obj->ops != &named_pipe_device_ops)
 720         set_error( STATUS_OBJECT_NAME_INVALID );
 721     else
 722     {
 723         struct named_pipe_device *dev = (struct named_pipe_device *)obj;
 724         if ((pipe = create_object( dev->pipes, &named_pipe_ops, &new_name, NULL )))
 725             clear_error();
 726     }
 727
 728     release_object( obj );
 729     return pipe;
 730 }
 731
 732 static struct pipe_server *get_pipe_server_obj( struct process *process,
 733                                 obj_handle_t handle, unsigned int access )
 734 {
 735     struct object *obj;
 736     obj = get_handle_obj( process, handle, access, &pipe_server_ops );
 737     return (struct pipe_server *) obj;
 738 }
 739
 740 static struct pipe_server *create_pipe_server( struct named_pipe *pipe, unsigned int options )
 741 {
 742     struct pipe_server *server;
 743
 744     server = alloc_object( &pipe_server_ops );
 745     if (!server)
 746         return NULL;
 747
 748     server->fd = NULL;
 749     server->pipe = pipe;
 750     server->client = NULL;
 751     server->flush_poll = NULL;
 752     server->options = options;
 753
 754     list_add_head( &pipe->servers, &server->entry );
 755     grab_object( pipe );
 756     if (!(server->ioctl_fd = alloc_pseudo_fd( &pipe_server_fd_ops, &server->obj, options )))
 757     {
 758         release_object( server );
 759         return NULL;
 760     }
 761     set_server_state( server, ps_idle_server );
 762     return server;
 763 }
 764
 765 static struct pipe_client *create_pipe_client( unsigned int flags )
 766 {
 767     struct pipe_client *client;
 768
 769     client = alloc_object( &pipe_client_ops );
 770     if (!client)
 771         return NULL;
 772
 773     client->fd = NULL;
 774     client->server = NULL;
 775     client->flags = flags;
 776
 777     return client;
 778 }
 779
 780 static struct pipe_server *find_available_server( struct named_pipe *pipe )
 781 {
 782     struct pipe_server *server;
 783
 784     /* look for pipe servers that are listening */
 785     LIST_FOR_EACH_ENTRY( server, &pipe->servers, struct pipe_server, entry )
 786     {
 787         if (server->state == ps_wait_open)
 788             return (struct pipe_server *)grab_object( server );
 789     }
 790
 791     /* fall back to pipe servers that are idle */
 792     LIST_FOR_EACH_ENTRY( server, &pipe->servers, struct pipe_server, entry )
 793     {
 794         if (server->state == ps_idle_server)
 795             return (struct pipe_server *)grab_object( server );
 796     }
 797
 798     return NULL;
 799 }
 800
 801 static struct object *named_pipe_open_file( struct object *obj, unsigned int access,
 802                                             unsigned int sharing, unsigned int options )
 803 {
 804     struct named_pipe *pipe = (struct named_pipe *)obj;
 805     struct pipe_server *server;
 806     struct pipe_client *client;
 807     unsigned int pipe_sharing;
 808     int fds[2];
 809
 810     if (!(server = find_available_server( pipe )))
 811     {
 812         set_error( STATUS_PIPE_NOT_AVAILABLE );
 813         return NULL;
 814     }
 815
 816     pipe_sharing = server->pipe->sharing;
 817     if (((access & GENERIC_READ) && !(pipe_sharing & FILE_SHARE_READ)) ||
 818         ((access & GENERIC_WRITE) && !(pipe_sharing & FILE_SHARE_WRITE)))
 819     {
 820         set_error( STATUS_ACCESS_DENIED );
 821         release_object( server );
 822         return NULL;
 823     }
 824
 825     if ((client = create_pipe_client( options )))
 826     {
 827         if (!socketpair( PF_UNIX, SOCK_STREAM, 0, fds ))
 828         {
 829             assert( !server->fd );
 830
 831             /* for performance reasons, only set nonblocking mode when using
 832              * overlapped I/O. Otherwise, we will be doing too much busy
 833              * looping */
 834             if (is_overlapped( options )) fcntl( fds[1], F_SETFL, O_NONBLOCK );
 835             if (is_overlapped( server->options )) fcntl( fds[0], F_SETFL, O_NONBLOCK );
 836
 837             if (pipe->insize)
 838             {
 839                 setsockopt( fds[0], SOL_SOCKET, SO_RCVBUF, &pipe->insize, sizeof(pipe->insize) );
 840                 setsockopt( fds[1], SOL_SOCKET, SO_RCVBUF, &pipe->insize, sizeof(pipe->insize) );
 841             }
 842             if (pipe->outsize)
 843             {
 844                 setsockopt( fds[0], SOL_SOCKET, SO_SNDBUF, &pipe->outsize, sizeof(pipe->outsize) );
 845                 setsockopt( fds[1], SOL_SOCKET, SO_SNDBUF, &pipe->outsize, sizeof(pipe->outsize) );
 846             }
 847
 848             client->fd = create_anonymous_fd( &pipe_client_fd_ops, fds[1], &client->obj, options );
 849             server->fd = create_anonymous_fd( &pipe_server_fd_ops, fds[0], &server->obj, server->options );
 850             if (client->fd && server->fd)
 851             {
 852                 allow_fd_caching( client->fd );
 853                 allow_fd_caching( server->fd );
 854                 fd_copy_completion( server->ioctl_fd, server->fd );
 855                 if (server->state == ps_wait_open)
 856                     fd_async_wake_up( server->ioctl_fd, ASYNC_TYPE_WAIT, STATUS_SUCCESS );
 857                 set_server_state( server, ps_connected_server );
 858                 server->client = client;
 859                 client->server = server;
 860             }
 861             else
 862             {
 863                 release_object( client );
 864                 client = NULL;
 865             }
 866         }
 867         else
 868         {
 869             file_set_error();
 870             release_object( client );
 871             client = NULL;
 872         }
 873     }
 874     release_object( server );
 875     return &client->obj;
 876 }
 877
 878 static obj_handle_t named_pipe_device_ioctl( struct fd *fd, ioctl_code_t code, const async_data_t *async_data,
 879                                              int blocking, const void *data, data_size_t size )
 880 {
 881     struct named_pipe_device *device = get_fd_user( fd );
 882
 883     switch(code)
 884     {
 885     case FSCTL_PIPE_WAIT:
 886         {
 887             const FILE_PIPE_WAIT_FOR_BUFFER *buffer = data;
 888             obj_handle_t wait_handle = 0;
 889             struct named_pipe *pipe;
 890             struct pipe_server *server;
 891             struct unicode_str name;
 892
 893             if (size < sizeof(*buffer) ||
 894                 size < FIELD_OFFSET(FILE_PIPE_WAIT_FOR_BUFFER, Name[buffer->NameLength/sizeof(WCHAR)]))
 895             {
 896                 set_error( STATUS_INVALID_PARAMETER );
 897                 return 0;
 898             }
 899             name.str = buffer->Name;
 900             name.len = (buffer->NameLength / sizeof(WCHAR)) * sizeof(WCHAR);
 901             if (!(pipe = (struct named_pipe *)find_object( device->pipes, &name, OBJ_CASE_INSENSITIVE )))
 902             {
 903                 set_error( STATUS_PIPE_NOT_AVAILABLE );
 904                 return 0;
 905             }
 906             if (!(server = find_available_server( pipe )))
 907             {
 908                 struct async *async;
 909
 910                 if (!pipe->waiters && !(pipe->waiters = create_async_queue( NULL ))) goto done;
 911
 912                 if (blocking)
 913                 {
 914                     async_data_t new_data = *async_data;
 915                     if (!(wait_handle = alloc_wait_event( current->process ))) goto done;
 916                     new_data.event = wait_handle;
 917                     if (!(async = create_async( current, pipe->waiters, &new_data )))
 918                     {
 919                         close_handle( current->process, wait_handle );
 920                         wait_handle = 0;
 921                     }
 922                 }
 923                 else async = create_async( current, pipe->waiters, async_data );
 924
 925                 if (async)
 926                 {
 927                     timeout_t when = buffer->TimeoutSpecified ? buffer->Timeout.QuadPart : pipe->timeout;
 928                     async_set_timeout( async, when, STATUS_IO_TIMEOUT );
 929                     release_object( async );
 930                     set_error( STATUS_PENDING );
 931                 }
 932             }
 933             else release_object( server );
 934
 935         done:
 936             release_object( pipe );
 937             return wait_handle;
 938         }
 939
 940     default:
 941         return default_fd_ioctl( fd, code, async_data, blocking, data, size );
 942     }
 943 }
 944
 945
 946 DECL_HANDLER(create_named_pipe)
 947 {
 948     struct named_pipe *pipe;
 949     struct pipe_server *server;
 950     struct unicode_str name;
 951     struct directory *root = NULL;
 952
 953     if (!req->sharing || (req->sharing & ~(FILE_SHARE_READ | FILE_SHARE_WRITE)) ||
 954         (!(req->flags & NAMED_PIPE_MESSAGE_STREAM_WRITE) && (req->flags & NAMED_PIPE_MESSAGE_STREAM_READ)))
 955     {
 956         set_error( STATUS_INVALID_PARAMETER );
 957         return;
 958     }
 959
 960     reply->handle = 0;
 961     get_req_unicode_str( &name );
 962     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
 963         return;
 964
 965     pipe = create_named_pipe( root, &name, req->attributes | OBJ_OPENIF );
 966
 967     if (root) release_object( root );
 968     if (!pipe) return;
 969
 970     if (get_error() != STATUS_OBJECT_NAME_EXISTS)
 971     {
 972         /* initialize it if it didn't already exist */
 973         pipe->instances = 0;
 974         pipe->waiters = NULL;
 975         list_init( &pipe->servers );
 976         pipe->insize = req->insize;
 977         pipe->outsize = req->outsize;
 978         pipe->maxinstances = req->maxinstances;
 979         pipe->timeout = req->timeout;
 980         pipe->flags = req->flags;
 981         pipe->sharing = req->sharing;
 982     }
 983     else
 984     {
 985         if (pipe->maxinstances <= pipe->instances)
 986         {
 987             set_error( STATUS_INSTANCE_NOT_AVAILABLE );
 988             release_object( pipe );
 989             return;
 990         }
 991         if (pipe->sharing != req->sharing)
 992         {
 993             set_error( STATUS_ACCESS_DENIED );
 994             release_object( pipe );
 995             return;
 996         }
 997         clear_error(); /* clear the name collision */
 998     }
 999
1000     server = create_pipe_server( pipe, req->options );
1001     if (server)
1002     {
1003         reply->handle = alloc_handle( current->process, server, req->access, req->attributes );
1004         server->pipe->instances++;
1005         release_object( server );
1006     }
1007
1008     release_object( pipe );
1009 }
1010
1011 DECL_HANDLER(get_named_pipe_info)
1012 {
1013     struct pipe_server *server;
1014     struct pipe_client *client = NULL;
1015
1016     server = get_pipe_server_obj( current->process, req->handle, FILE_READ_ATTRIBUTES );
1017     if (!server)
1018     {
1019         if (get_error() != STATUS_OBJECT_TYPE_MISMATCH)
1020             return;
1021
1022         clear_error();
1023         client = (struct pipe_client *)get_handle_obj( current->process, req->handle,
1024                                                        0, &pipe_client_ops );
1025         if (!client) return;
1026         server = client->server;
1027     }
1028
1029     reply->flags        = server->pipe->flags;
1030     reply->sharing      = server->pipe->sharing;
1031     reply->maxinstances = server->pipe->maxinstances;
1032     reply->instances    = server->pipe->instances;
1033     reply->insize       = server->pipe->insize;
1034     reply->outsize      = server->pipe->outsize;
1035
1036     if (client)
1037         release_object(client);
1038     else
1039     {
1040         reply->flags |= NAMED_PIPE_SERVER_END;
1041         release_object(server);
1042     }
1043 }