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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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 "windef.h"
  46 #include "winternl.h"
  47
  48 #include "file.h"
  49 #include "handle.h"
  50 #include "thread.h"
  51 #include "request.h"
  52
  53 enum pipe_state
  54 {
  55     ps_idle_server,
  56     ps_wait_open,
  57     ps_connected_server,
  58     ps_wait_disconnect,
  59     ps_disconnected_server,
  60     ps_wait_connect
  61 };
  62
  63 struct named_pipe;
  64
  65 struct pipe_server
  66 {
  67     struct object        obj;        /* object header */
  68     struct fd           *fd;         /* pipe file descriptor */
  69     struct list          entry;      /* entry in named pipe servers list */
  70     enum pipe_state      state;      /* server state */
  71     struct pipe_client  *client;     /* client that this server is connected to */
  72     struct named_pipe   *pipe;
  73     struct timeout_user *flush_poll;
  74     struct event        *event;
  75     struct list          wait_q;     /* only a single one can be queued */
  76     unsigned int         options;    /* pipe options */
  77 };
  78
  79 struct pipe_client
  80 {
  81     struct object        obj;        /* object header */
  82     struct fd           *fd;         /* pipe file descriptor */
  83     struct pipe_server  *server;     /* server that this client is connected to */
  84     unsigned int         flags;      /* file flags */
  85 };
  86
  87 struct named_pipe
  88 {
  89     struct object       obj;         /* object header */
  90     unsigned int        flags;
  91     unsigned int        maxinstances;
  92     unsigned int        outsize;
  93     unsigned int        insize;
  94     unsigned int        timeout;
  95     unsigned int        instances;
  96     struct list         servers;     /* list of servers using this pipe */
  97     struct list         waiters;     /* list of clients waiting to connect */
  98 };
  99
 100 static void named_pipe_dump( struct object *obj, int verbose );
 101 static void named_pipe_destroy( struct object *obj );
 102
 103 static const struct object_ops named_pipe_ops =
 104 {
 105     sizeof(struct named_pipe),    /* size */
 106     named_pipe_dump,              /* dump */
 107     no_add_queue,                 /* add_queue */
 108     NULL,                         /* remove_queue */
 109     NULL,                         /* signaled */
 110     NULL,                         /* satisfied */
 111     no_signal,                    /* signal */
 112     no_get_fd,                    /* get_fd */
 113     no_close_handle,              /* close_handle */
 114     named_pipe_destroy            /* destroy */
 115 };
 116
 117 /* server end functions */
 118 static void pipe_server_dump( struct object *obj, int verbose );
 119 static struct fd *pipe_server_get_fd( struct object *obj );
 120 static void pipe_server_destroy( struct object *obj);
 121 static int pipe_server_flush( struct fd *fd, struct event **event );
 122 static int pipe_server_get_info( struct fd *fd );
 123
 124 static const struct object_ops pipe_server_ops =
 125 {
 126     sizeof(struct pipe_server),   /* size */
 127     pipe_server_dump,             /* dump */
 128     default_fd_add_queue,         /* add_queue */
 129     default_fd_remove_queue,      /* remove_queue */
 130     default_fd_signaled,          /* signaled */
 131     no_satisfied,                 /* satisfied */
 132     no_signal,                    /* signal */
 133     pipe_server_get_fd,           /* get_fd */
 134     no_close_handle,              /* close_handle */
 135     pipe_server_destroy           /* destroy */
 136 };
 137
 138 static const struct fd_ops pipe_server_fd_ops =
 139 {
 140     default_fd_get_poll_events,     /* get_poll_events */
 141     default_poll_event,           /* poll_event */
 142     pipe_server_flush,            /* flush */
 143     pipe_server_get_info,         /* get_file_info */
 144     default_fd_queue_async,       /* queue_async */
 145     default_fd_cancel_async,      /* cancel_async */
 146 };
 147
 148 /* client end functions */
 149 static void pipe_client_dump( struct object *obj, int verbose );
 150 static struct fd *pipe_client_get_fd( struct object *obj );
 151 static void pipe_client_destroy( struct object *obj );
 152 static int pipe_client_flush( struct fd *fd, struct event **event );
 153 static int pipe_client_get_info( struct fd *fd );
 154
 155 static const struct object_ops pipe_client_ops =
 156 {
 157     sizeof(struct pipe_client),   /* size */
 158     pipe_client_dump,             /* dump */
 159     default_fd_add_queue,         /* add_queue */
 160     default_fd_remove_queue,      /* remove_queue */
 161     default_fd_signaled,          /* signaled */
 162     no_satisfied,                 /* satisfied */
 163     no_signal,                    /* signal */
 164     pipe_client_get_fd,           /* get_fd */
 165     no_close_handle,              /* close_handle */
 166     pipe_client_destroy           /* destroy */
 167 };
 168
 169 static const struct fd_ops pipe_client_fd_ops =
 170 {
 171     default_fd_get_poll_events,   /* get_poll_events */
 172     default_poll_event,           /* poll_event */
 173     pipe_client_flush,            /* flush */
 174     pipe_client_get_info,         /* get_file_info */
 175     default_fd_queue_async,       /* queue_async */
 176     default_fd_cancel_async       /* cancel_async */
 177 };
 178
 179 static void named_pipe_dump( struct object *obj, int verbose )
 180 {
 181     struct named_pipe *pipe = (struct named_pipe *) obj;
 182     assert( obj->ops == &named_pipe_ops );
 183     fprintf( stderr, "Named pipe " );
 184     dump_object_name( &pipe->obj );
 185     fprintf( stderr, "\n" );
 186 }
 187
 188 static void pipe_server_dump( struct object *obj, int verbose )
 189 {
 190     struct pipe_server *server = (struct pipe_server *) obj;
 191     assert( obj->ops == &pipe_server_ops );
 192     fprintf( stderr, "Named pipe server pipe=%p state=%d\n", server->pipe, server->state );
 193 }
 194
 195 static void pipe_client_dump( struct object *obj, int verbose )
 196 {
 197     struct pipe_client *client = (struct pipe_client *) obj;
 198     assert( obj->ops == &pipe_client_ops );
 199     fprintf( stderr, "Named pipe client server=%p\n", client->server );
 200 }
 201
 202 static void named_pipe_destroy( struct object *obj)
 203 {
 204     struct named_pipe *pipe = (struct named_pipe *) obj;
 205
 206     assert( list_empty( &pipe->servers ) );
 207     assert( !pipe->instances );
 208     async_terminate_queue( &pipe->waiters, STATUS_HANDLES_CLOSED );
 209 }
 210
 211 static struct fd *pipe_client_get_fd( struct object *obj )
 212 {
 213     struct pipe_client *client = (struct pipe_client *) obj;
 214     if (client->fd)
 215         return (struct fd *) grab_object( client->fd );
 216     set_error( STATUS_PIPE_DISCONNECTED );
 217     return NULL;
 218 }
 219
 220 static struct fd *pipe_server_get_fd( struct object *obj )
 221 {
 222     struct pipe_server *server = (struct pipe_server *) obj;
 223
 224     switch(server->state)
 225     {
 226     case ps_connected_server:
 227     case ps_wait_disconnect:
 228         assert( server->fd );
 229         return (struct fd *) grab_object( server->fd );
 230
 231     case ps_wait_open:
 232     case ps_idle_server:
 233         set_error( STATUS_PIPE_LISTENING );
 234         break;
 235
 236     case ps_disconnected_server:
 237     case ps_wait_connect:
 238         set_error( STATUS_PIPE_DISCONNECTED );
 239         break;
 240     }
 241     return NULL;
 242 }
 243
 244
 245 static void notify_empty( struct pipe_server *server )
 246 {
 247     if (!server->flush_poll)
 248         return;
 249     assert( server->state == ps_connected_server );
 250     assert( server->event );
 251     remove_timeout_user( server->flush_poll );
 252     server->flush_poll = NULL;
 253     set_event( server->event );
 254     release_object( server->event );
 255     server->event = NULL;
 256 }
 257
 258 static void do_disconnect( struct pipe_server *server )
 259 {
 260     /* we may only have a server fd, if the client disconnected */
 261     if (server->client)
 262     {
 263         assert( server->client->server == server );
 264         assert( server->client->fd );
 265         release_object( server->client->fd );
 266         server->client->fd = NULL;
 267     }
 268     assert( server->fd );
 269     release_object( server->fd );
 270     server->fd = NULL;
 271 }
 272
 273 static void pipe_server_destroy( struct object *obj)
 274 {
 275     struct pipe_server *server = (struct pipe_server *)obj;
 276
 277     assert( obj->ops == &pipe_server_ops );
 278
 279     if (server->fd)
 280     {
 281         notify_empty( server );
 282         do_disconnect( server );
 283     }
 284
 285     if (server->client)
 286     {
 287         server->client->server = NULL;
 288         server->client = NULL;
 289     }
 290
 291     async_terminate_head( &server->wait_q, STATUS_HANDLES_CLOSED );
 292
 293     assert( server->pipe->instances );
 294     server->pipe->instances--;
 295
 296     list_remove( &server->entry );
 297     release_object( server->pipe );
 298 }
 299
 300 static void pipe_client_destroy( struct object *obj)
 301 {
 302     struct pipe_client *client = (struct pipe_client *)obj;
 303     struct pipe_server *server = client->server;
 304
 305     assert( obj->ops == &pipe_client_ops );
 306
 307     if (server)
 308     {
 309         notify_empty( server );
 310
 311         switch(server->state)
 312         {
 313         case ps_connected_server:
 314             /* Don't destroy the server's fd here as we can't
 315                do a successful flush without it. */
 316             server->state = ps_wait_disconnect;
 317             release_object( client->fd );
 318             client->fd = NULL;
 319             break;
 320         case ps_disconnected_server:
 321             server->state = ps_wait_connect;
 322             break;
 323         case ps_idle_server:
 324         case ps_wait_open:
 325         case ps_wait_disconnect:
 326         case ps_wait_connect:
 327             assert( 0 );
 328         }
 329         assert( server->client );
 330         server->client = NULL;
 331         client->server = NULL;
 332     }
 333     assert( !client->fd );
 334 }
 335
 336 static int pipe_data_remaining( struct pipe_server *server )
 337 {
 338     struct pollfd pfd;
 339     int fd;
 340
 341     assert( server->client );
 342
 343     fd = get_unix_fd( server->client->fd );
 344     if (fd < 0)
 345         return 0;
 346     pfd.fd = fd;
 347     pfd.events = POLLIN;
 348     pfd.revents = 0;
 349
 350     if (0 > poll( &pfd, 1, 0 ))
 351         return 0;
 352
 353     return pfd.revents&POLLIN;
 354 }
 355
 356 static void check_flushed( void *arg )
 357 {
 358     struct pipe_server *server = (struct pipe_server*) arg;
 359
 360     assert( server->event );
 361     if (pipe_data_remaining( server ))
 362     {
 363         struct timeval tv;
 364
 365         gettimeofday( &tv, NULL );
 366         add_timeout( &tv, 100 );
 367         server->flush_poll = add_timeout_user( &tv, check_flushed, server );
 368     }
 369     else
 370     {
 371         /* notify_empty( server ); */
 372         server->flush_poll = NULL;
 373         set_event( server->event );
 374         release_object( server->event );
 375         server->event = NULL;
 376     }
 377 }
 378
 379 static int pipe_server_flush( struct fd *fd, struct event **event )
 380 {
 381     struct pipe_server *server = get_fd_user( fd );
 382
 383     if (!server)
 384         return 0;
 385
 386     if (server->state != ps_connected_server)
 387         return 0;
 388
 389     /* FIXME: if multiple threads flush the same pipe,
 390               maybe should create a list of processes to notify */
 391     if (server->flush_poll)
 392         return 0;
 393
 394     if (pipe_data_remaining( server ))
 395     {
 396         struct timeval tv;
 397
 398         /* this kind of sux -
 399            there's no unix way to be alerted when a pipe becomes empty */
 400         server->event = create_event( NULL, 0, 0, 0, 0 );
 401         if (!server->event)
 402             return 0;
 403         gettimeofday( &tv, NULL );
 404         add_timeout( &tv, 100 );
 405         server->flush_poll = add_timeout_user( &tv, check_flushed, server );
 406         *event = server->event;
 407     }
 408
 409     return 0;
 410 }
 411
 412 static int pipe_client_flush( struct fd *fd, struct event **event )
 413 {
 414     /* FIXME: what do we have to do for this? */
 415     return 0;
 416 }
 417
 418 static inline int is_overlapped( unsigned int options )
 419 {
 420     return !(options & (FILE_SYNCHRONOUS_IO_ALERT | FILE_SYNCHRONOUS_IO_NONALERT));
 421 }
 422
 423 static int pipe_server_get_info( struct fd *fd )
 424 {
 425     struct pipe_server *server = get_fd_user( fd );
 426     int flags = FD_FLAG_AVAILABLE;
 427
 428     if (is_overlapped( server->options )) flags |= FD_FLAG_OVERLAPPED;
 429
 430     return flags;
 431 }
 432
 433 static int pipe_client_get_info( struct fd *fd )
 434 {
 435     struct pipe_client *client = get_fd_user( fd );
 436     int flags = FD_FLAG_AVAILABLE;
 437
 438     if (is_overlapped( client->flags )) flags |= FD_FLAG_OVERLAPPED;
 439
 440     return flags;
 441 }
 442
 443 static struct named_pipe *create_named_pipe( const WCHAR *name, size_t len, unsigned int attr )
 444 {
 445     struct named_pipe *pipe;
 446
 447     pipe = create_named_object( sync_namespace, &named_pipe_ops, name, len, attr );
 448     if (pipe)
 449     {
 450         if (get_error() != STATUS_OBJECT_NAME_COLLISION)
 451         {
 452             /* initialize it if it didn't already exist */
 453             pipe->instances = 0;
 454             list_init( &pipe->servers );
 455             list_init( &pipe->waiters );
 456         }
 457     }
 458     return pipe;
 459 }
 460
 461 static struct named_pipe *open_named_pipe( const WCHAR *name, size_t len, unsigned int attr )
 462 {
 463     struct object *obj;
 464
 465     if ((obj = find_object( sync_namespace, name, len, attr )))
 466     {
 467         if (obj->ops == &named_pipe_ops) return (struct named_pipe *)obj;
 468         release_object( obj );
 469         set_error( STATUS_OBJECT_TYPE_MISMATCH );
 470     }
 471     else set_error( STATUS_OBJECT_NAME_NOT_FOUND );
 472
 473     return NULL;
 474 }
 475
 476 static struct pipe_server *get_pipe_server_obj( struct process *process,
 477                                 obj_handle_t handle, unsigned int access )
 478 {
 479     struct object *obj;
 480     obj = get_handle_obj( process, handle, access, &pipe_server_ops );
 481     return (struct pipe_server *) obj;
 482 }
 483
 484 static struct pipe_server *create_pipe_server( struct named_pipe *pipe, unsigned int options )
 485 {
 486     struct pipe_server *server;
 487
 488     server = alloc_object( &pipe_server_ops );
 489     if (!server)
 490         return NULL;
 491
 492     server->fd = NULL;
 493     server->pipe = pipe;
 494     server->state = ps_idle_server;
 495     server->client = NULL;
 496     server->flush_poll = NULL;
 497     server->options = options;
 498     list_init( &server->wait_q );
 499
 500     list_add_head( &pipe->servers, &server->entry );
 501     grab_object( pipe );
 502
 503     return server;
 504 }
 505
 506 static struct pipe_client *create_pipe_client( struct pipe_server *server, unsigned int flags )
 507 {
 508     struct pipe_client *client;
 509
 510     client = alloc_object( &pipe_client_ops );
 511     if (!client)
 512         return NULL;
 513
 514     client->fd = NULL;
 515     client->server = server;
 516     client->flags = flags;
 517
 518     return client;
 519 }
 520
 521 static inline struct pipe_server *find_server( struct named_pipe *pipe, enum pipe_state state )
 522 {
 523     struct pipe_server *server;
 524
 525     LIST_FOR_EACH_ENTRY( server, &pipe->servers, struct pipe_server, entry )
 526     {
 527         if (server->state == state) return (struct pipe_server *)grab_object( server );
 528     }
 529     return NULL;
 530 }
 531
 532 static inline struct pipe_server *find_server2( struct named_pipe *pipe,
 533                                                 enum pipe_state state1, enum pipe_state state2 )
 534 {
 535     struct pipe_server *server;
 536
 537     LIST_FOR_EACH_ENTRY( server, &pipe->servers, struct pipe_server, entry )
 538     {
 539         if (server->state == state1 || server->state == state2)
 540             return (struct pipe_server *)grab_object( server );
 541     }
 542     return NULL;
 543 }
 544
 545 DECL_HANDLER(create_named_pipe)
 546 {
 547     struct named_pipe *pipe;
 548     struct pipe_server *server;
 549
 550     reply->handle = 0;
 551     pipe = create_named_pipe( get_req_data(), get_req_data_size(), req->attributes );
 552     if (!pipe)
 553         return;
 554
 555     if (get_error() != STATUS_OBJECT_NAME_COLLISION)
 556     {
 557         pipe->insize = req->insize;
 558         pipe->outsize = req->outsize;
 559         pipe->maxinstances = req->maxinstances;
 560         pipe->timeout = req->timeout;
 561         pipe->flags = req->flags;
 562     }
 563     else
 564     {
 565         if (pipe->maxinstances <= pipe->instances)
 566         {
 567             set_error( STATUS_INSTANCE_NOT_AVAILABLE );
 568             release_object( pipe );
 569             return;
 570         }
 571         if ((pipe->maxinstances != req->maxinstances) ||
 572             (pipe->timeout != req->timeout) ||
 573             (pipe->flags != req->flags))
 574         {
 575             set_error( STATUS_ACCESS_DENIED );
 576             release_object( pipe );
 577             return;
 578         }
 579         set_error( 0 );  /* clear the name collision */
 580     }
 581
 582     server = create_pipe_server( pipe, req->options );
 583     if (server)
 584     {
 585         reply->handle = alloc_handle( current->process, server,
 586                                       req->access, req->attributes & OBJ_INHERIT );
 587         server->pipe->instances++;
 588         release_object( server );
 589     }
 590
 591     release_object( pipe );
 592 }
 593
 594 DECL_HANDLER(open_named_pipe)
 595 {
 596     struct pipe_server *server;
 597     struct pipe_client *client;
 598     struct named_pipe *pipe;
 599     int fds[2];
 600
 601     if (!(pipe = open_named_pipe( get_req_data(), get_req_data_size(), req->attributes )))
 602         return;
 603
 604     server = find_server2( pipe, ps_idle_server, ps_wait_open );
 605     release_object( pipe );
 606
 607     if (!server)
 608     {
 609         set_error( STATUS_PIPE_NOT_AVAILABLE );
 610         return;
 611     }
 612
 613     client = create_pipe_client( server, req->flags );
 614     if (client)
 615     {
 616         if (!socketpair( PF_UNIX, SOCK_STREAM, 0, fds ))
 617         {
 618             int res = 0;
 619
 620             assert( !client->fd );
 621             assert( !server->fd );
 622
 623             /* for performance reasons, only set nonblocking mode when using
 624              * overlapped I/O. Otherwise, we will be doing too much busy
 625              * looping */
 626             if (is_overlapped( req->flags ))
 627                 res = fcntl( fds[1], F_SETFL, O_NONBLOCK );
 628             if ((res != -1) && is_overlapped( server->options ))
 629                 res = fcntl( fds[0], F_SETFL, O_NONBLOCK );
 630
 631             client->fd = create_anonymous_fd( &pipe_client_fd_ops,
 632                                             fds[1], &client->obj );
 633             server->fd = create_anonymous_fd( &pipe_server_fd_ops,
 634                                             fds[0], &server->obj );
 635             if (client->fd && server->fd && res != 1)
 636             {
 637                 if (server->state == ps_wait_open)
 638                     async_terminate_head( &server->wait_q, STATUS_SUCCESS );
 639                 assert( list_empty( &server->wait_q ) );
 640                 server->state = ps_connected_server;
 641                 server->client = client;
 642                 client->server = server;
 643                 reply->handle = alloc_handle( current->process, client,
 644                                               req->access, req->attributes & OBJ_INHERIT );
 645             }
 646         }
 647         else
 648             file_set_error();
 649
 650         release_object( client );
 651     }
 652     release_object( server );
 653 }
 654
 655 DECL_HANDLER(connect_named_pipe)
 656 {
 657     struct pipe_server *server;
 658
 659     server = get_pipe_server_obj(current->process, req->handle, 0);
 660     if (!server)
 661         return;
 662
 663     switch(server->state)
 664     {
 665     case ps_idle_server:
 666     case ps_wait_connect:
 667         assert( !server->fd );
 668         server->state = ps_wait_open;
 669         create_async( current, NULL, &server->wait_q,
 670                       req->func, req->event, NULL );
 671         async_terminate_queue( &server->pipe->waiters, STATUS_SUCCESS );
 672         break;
 673     case ps_connected_server:
 674         assert( server->fd );
 675         set_error( STATUS_PIPE_CONNECTED );
 676         break;
 677     case ps_disconnected_server:
 678         set_error( STATUS_PIPE_BUSY );
 679         break;
 680     case ps_wait_disconnect:
 681         set_error( STATUS_NO_DATA_DETECTED );
 682         break;
 683     case ps_wait_open:
 684         set_error( STATUS_INVALID_HANDLE );
 685         break;
 686     }
 687
 688     release_object(server);
 689 }
 690
 691 DECL_HANDLER(wait_named_pipe)
 692 {
 693     struct named_pipe *pipe;
 694     struct pipe_server *server;
 695
 696     if (!(pipe = open_named_pipe( get_req_data(), get_req_data_size(), OBJ_CASE_INSENSITIVE )))
 697     {
 698         set_error( STATUS_PIPE_NOT_AVAILABLE );
 699         return;
 700     }
 701     server = find_server( pipe, ps_wait_open );
 702     if (server)
 703     {
 704         /* there's already a server waiting for a client to connect */
 705         thread_queue_apc( current, NULL, req->func, APC_ASYNC_IO,
 706                           1, req->overlapped, NULL, (void *)STATUS_SUCCESS );
 707         release_object( server );
 708     }
 709     else
 710     {
 711         int timeout;
 712         if (req->timeout == NMPWAIT_USE_DEFAULT_WAIT)
 713             timeout = pipe->timeout;
 714         else
 715             timeout = req->timeout;
 716
 717         if (req->timeout == NMPWAIT_WAIT_FOREVER)
 718             create_async( current, NULL, &pipe->waiters,
 719                           req->func, req->overlapped, NULL );
 720         else
 721             create_async( current, &timeout, &pipe->waiters,
 722                           req->func, req->overlapped, NULL );
 723     }
 724
 725     release_object( pipe );
 726 }
 727
 728 DECL_HANDLER(disconnect_named_pipe)
 729 {
 730     struct pipe_server *server;
 731
 732     reply->fd = -1;
 733     server = get_pipe_server_obj( current->process, req->handle, 0 );
 734     if (!server)
 735         return;
 736     switch(server->state)
 737     {
 738     case ps_connected_server:
 739         assert( server->fd );
 740         assert( server->client );
 741         assert( server->client->fd );
 742
 743         notify_empty( server );
 744
 745         /* Dump the client and server fds, but keep the pointers
 746            around - client loses all waiting data */
 747         server->state = ps_disconnected_server;
 748         do_disconnect( server );
 749         reply->fd = flush_cached_fd( current->process, req->handle );
 750         break;
 751
 752     case ps_wait_disconnect:
 753         assert( !server->client );
 754         assert( server->fd );
 755         do_disconnect( server );
 756         server->state = ps_wait_connect;
 757         reply->fd = flush_cached_fd( current->process, req->handle );
 758         break;
 759
 760     case ps_idle_server:
 761     case ps_wait_open:
 762     case ps_disconnected_server:
 763     case ps_wait_connect:
 764         set_error( STATUS_PIPE_DISCONNECTED );
 765         break;
 766     }
 767     release_object( server );
 768 }
 769
 770 DECL_HANDLER(get_named_pipe_info)
 771 {
 772     struct pipe_server *server;
 773
 774     server = get_pipe_server_obj( current->process, req->handle, 0 );
 775     if (!server)
 776         return;
 777
 778     reply->flags        = server->pipe->flags;
 779     reply->maxinstances = server->pipe->maxinstances;
 780     reply->insize       = server->pipe->insize;
 781     reply->outsize      = server->pipe->outsize;
 782
 783     release_object(server);
 784 }