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_lookup_name,               /* lookup_name */
 114     no_close_handle,              /* close_handle */
 115     named_pipe_destroy            /* destroy */
 116 };
 117
 118 /* server end functions */
 119 static void pipe_server_dump( struct object *obj, int verbose );
 120 static struct fd *pipe_server_get_fd( struct object *obj );
 121 static void pipe_server_destroy( struct object *obj);
 122 static int pipe_server_flush( struct fd *fd, struct event **event );
 123 static int pipe_server_get_info( struct fd *fd );
 124
 125 static const struct object_ops pipe_server_ops =
 126 {
 127     sizeof(struct pipe_server),   /* size */
 128     pipe_server_dump,             /* dump */
 129     default_fd_add_queue,         /* add_queue */
 130     default_fd_remove_queue,      /* remove_queue */
 131     default_fd_signaled,          /* signaled */
 132     no_satisfied,                 /* satisfied */
 133     no_signal,                    /* signal */
 134     pipe_server_get_fd,           /* get_fd */
 135     no_lookup_name,               /* lookup_name */
 136     no_close_handle,              /* close_handle */
 137     pipe_server_destroy           /* destroy */
 138 };
 139
 140 static const struct fd_ops pipe_server_fd_ops =
 141 {
 142     default_fd_get_poll_events,     /* get_poll_events */
 143     default_poll_event,           /* poll_event */
 144     pipe_server_flush,            /* flush */
 145     pipe_server_get_info,         /* get_file_info */
 146     default_fd_queue_async,       /* queue_async */
 147     default_fd_cancel_async,      /* cancel_async */
 148 };
 149
 150 /* client end functions */
 151 static void pipe_client_dump( struct object *obj, int verbose );
 152 static struct fd *pipe_client_get_fd( struct object *obj );
 153 static void pipe_client_destroy( struct object *obj );
 154 static int pipe_client_flush( struct fd *fd, struct event **event );
 155 static int pipe_client_get_info( struct fd *fd );
 156
 157 static const struct object_ops pipe_client_ops =
 158 {
 159     sizeof(struct pipe_client),   /* size */
 160     pipe_client_dump,             /* dump */
 161     default_fd_add_queue,         /* add_queue */
 162     default_fd_remove_queue,      /* remove_queue */
 163     default_fd_signaled,          /* signaled */
 164     no_satisfied,                 /* satisfied */
 165     no_signal,                    /* signal */
 166     pipe_client_get_fd,           /* get_fd */
 167     no_lookup_name,               /* lookup_name */
 168     no_close_handle,              /* close_handle */
 169     pipe_client_destroy           /* destroy */
 170 };
 171
 172 static const struct fd_ops pipe_client_fd_ops =
 173 {
 174     default_fd_get_poll_events,   /* get_poll_events */
 175     default_poll_event,           /* poll_event */
 176     pipe_client_flush,            /* flush */
 177     pipe_client_get_info,         /* get_file_info */
 178     default_fd_queue_async,       /* queue_async */
 179     default_fd_cancel_async       /* cancel_async */
 180 };
 181
 182 static void named_pipe_dump( struct object *obj, int verbose )
 183 {
 184     struct named_pipe *pipe = (struct named_pipe *) obj;
 185     assert( obj->ops == &named_pipe_ops );
 186     fprintf( stderr, "Named pipe " );
 187     dump_object_name( &pipe->obj );
 188     fprintf( stderr, "\n" );
 189 }
 190
 191 static void pipe_server_dump( struct object *obj, int verbose )
 192 {
 193     struct pipe_server *server = (struct pipe_server *) obj;
 194     assert( obj->ops == &pipe_server_ops );
 195     fprintf( stderr, "Named pipe server pipe=%p state=%d\n", server->pipe, server->state );
 196 }
 197
 198 static void pipe_client_dump( struct object *obj, int verbose )
 199 {
 200     struct pipe_client *client = (struct pipe_client *) obj;
 201     assert( obj->ops == &pipe_client_ops );
 202     fprintf( stderr, "Named pipe client server=%p\n", client->server );
 203 }
 204
 205 static void named_pipe_destroy( struct object *obj)
 206 {
 207     struct named_pipe *pipe = (struct named_pipe *) obj;
 208
 209     assert( list_empty( &pipe->servers ) );
 210     assert( !pipe->instances );
 211     async_terminate_queue( &pipe->waiters, STATUS_HANDLES_CLOSED );
 212 }
 213
 214 static struct fd *pipe_client_get_fd( struct object *obj )
 215 {
 216     struct pipe_client *client = (struct pipe_client *) obj;
 217     if (client->fd)
 218         return (struct fd *) grab_object( client->fd );
 219     set_error( STATUS_PIPE_DISCONNECTED );
 220     return NULL;
 221 }
 222
 223 static struct fd *pipe_server_get_fd( struct object *obj )
 224 {
 225     struct pipe_server *server = (struct pipe_server *) obj;
 226
 227     switch(server->state)
 228     {
 229     case ps_connected_server:
 230     case ps_wait_disconnect:
 231         assert( server->fd );
 232         return (struct fd *) grab_object( server->fd );
 233
 234     case ps_wait_open:
 235     case ps_idle_server:
 236         set_error( STATUS_PIPE_LISTENING );
 237         break;
 238
 239     case ps_disconnected_server:
 240     case ps_wait_connect:
 241         set_error( STATUS_PIPE_DISCONNECTED );
 242         break;
 243     }
 244     return NULL;
 245 }
 246
 247
 248 static void notify_empty( struct pipe_server *server )
 249 {
 250     if (!server->flush_poll)
 251         return;
 252     assert( server->state == ps_connected_server );
 253     assert( server->event );
 254     remove_timeout_user( server->flush_poll );
 255     server->flush_poll = NULL;
 256     set_event( server->event );
 257     release_object( server->event );
 258     server->event = NULL;
 259 }
 260
 261 static void do_disconnect( struct pipe_server *server )
 262 {
 263     /* we may only have a server fd, if the client disconnected */
 264     if (server->client)
 265     {
 266         assert( server->client->server == server );
 267         assert( server->client->fd );
 268         release_object( server->client->fd );
 269         server->client->fd = NULL;
 270     }
 271     assert( server->fd );
 272     release_object( server->fd );
 273     server->fd = NULL;
 274 }
 275
 276 static void pipe_server_destroy( struct object *obj)
 277 {
 278     struct pipe_server *server = (struct pipe_server *)obj;
 279
 280     assert( obj->ops == &pipe_server_ops );
 281
 282     if (server->fd)
 283     {
 284         notify_empty( server );
 285         do_disconnect( server );
 286     }
 287
 288     if (server->client)
 289     {
 290         server->client->server = NULL;
 291         server->client = NULL;
 292     }
 293
 294     async_terminate_head( &server->wait_q, STATUS_HANDLES_CLOSED );
 295
 296     assert( server->pipe->instances );
 297     server->pipe->instances--;
 298
 299     list_remove( &server->entry );
 300     release_object( server->pipe );
 301 }
 302
 303 static void pipe_client_destroy( struct object *obj)
 304 {
 305     struct pipe_client *client = (struct pipe_client *)obj;
 306     struct pipe_server *server = client->server;
 307
 308     assert( obj->ops == &pipe_client_ops );
 309
 310     if (server)
 311     {
 312         notify_empty( server );
 313
 314         switch(server->state)
 315         {
 316         case ps_connected_server:
 317             /* Don't destroy the server's fd here as we can't
 318                do a successful flush without it. */
 319             server->state = ps_wait_disconnect;
 320             release_object( client->fd );
 321             client->fd = NULL;
 322             break;
 323         case ps_disconnected_server:
 324             server->state = ps_wait_connect;
 325             break;
 326         case ps_idle_server:
 327         case ps_wait_open:
 328         case ps_wait_disconnect:
 329         case ps_wait_connect:
 330             assert( 0 );
 331         }
 332         assert( server->client );
 333         server->client = NULL;
 334         client->server = NULL;
 335     }
 336     assert( !client->fd );
 337 }
 338
 339 static int pipe_data_remaining( struct pipe_server *server )
 340 {
 341     struct pollfd pfd;
 342     int fd;
 343
 344     assert( server->client );
 345
 346     fd = get_unix_fd( server->client->fd );
 347     if (fd < 0)
 348         return 0;
 349     pfd.fd = fd;
 350     pfd.events = POLLIN;
 351     pfd.revents = 0;
 352
 353     if (0 > poll( &pfd, 1, 0 ))
 354         return 0;
 355
 356     return pfd.revents&POLLIN;
 357 }
 358
 359 static void check_flushed( void *arg )
 360 {
 361     struct pipe_server *server = (struct pipe_server*) arg;
 362
 363     assert( server->event );
 364     if (pipe_data_remaining( server ))
 365     {
 366         struct timeval tv;
 367
 368         gettimeofday( &tv, NULL );
 369         add_timeout( &tv, 100 );
 370         server->flush_poll = add_timeout_user( &tv, check_flushed, server );
 371     }
 372     else
 373     {
 374         /* notify_empty( server ); */
 375         server->flush_poll = NULL;
 376         set_event( server->event );
 377         release_object( server->event );
 378         server->event = NULL;
 379     }
 380 }
 381
 382 static int pipe_server_flush( struct fd *fd, struct event **event )
 383 {
 384     struct pipe_server *server = get_fd_user( fd );
 385
 386     if (!server)
 387         return 0;
 388
 389     if (server->state != ps_connected_server)
 390         return 0;
 391
 392     /* FIXME: if multiple threads flush the same pipe,
 393               maybe should create a list of processes to notify */
 394     if (server->flush_poll)
 395         return 0;
 396
 397     if (pipe_data_remaining( server ))
 398     {
 399         struct timeval tv;
 400
 401         /* this kind of sux -
 402            there's no unix way to be alerted when a pipe becomes empty */
 403         server->event = create_event( NULL, 0, 0, 0 );
 404         if (!server->event)
 405             return 0;
 406         gettimeofday( &tv, NULL );
 407         add_timeout( &tv, 100 );
 408         server->flush_poll = add_timeout_user( &tv, check_flushed, server );
 409         *event = server->event;
 410     }
 411
 412     return 0;
 413 }
 414
 415 static int pipe_client_flush( struct fd *fd, struct event **event )
 416 {
 417     /* FIXME: what do we have to do for this? */
 418     return 0;
 419 }
 420
 421 static inline int is_overlapped( unsigned int options )
 422 {
 423     return !(options & (FILE_SYNCHRONOUS_IO_ALERT | FILE_SYNCHRONOUS_IO_NONALERT));
 424 }
 425
 426 static int pipe_server_get_info( struct fd *fd )
 427 {
 428     struct pipe_server *server = get_fd_user( fd );
 429     int flags = FD_FLAG_AVAILABLE;
 430
 431     if (is_overlapped( server->options )) flags |= FD_FLAG_OVERLAPPED;
 432
 433     return flags;
 434 }
 435
 436 static int pipe_client_get_info( struct fd *fd )
 437 {
 438     struct pipe_client *client = get_fd_user( fd );
 439     int flags = FD_FLAG_AVAILABLE;
 440
 441     if (is_overlapped( client->flags )) flags |= FD_FLAG_OVERLAPPED;
 442
 443     return flags;
 444 }
 445
 446 static struct named_pipe *create_named_pipe( const struct unicode_str *name, unsigned int attr )
 447 {
 448     struct named_pipe *pipe;
 449
 450     pipe = create_named_object( sync_namespace, &named_pipe_ops, name, attr | OBJ_OPENIF );
 451     if (pipe)
 452     {
 453         if (get_error() != STATUS_OBJECT_NAME_EXISTS)
 454         {
 455             /* initialize it if it didn't already exist */
 456             pipe->instances = 0;
 457             list_init( &pipe->servers );
 458             list_init( &pipe->waiters );
 459         }
 460     }
 461     return pipe;
 462 }
 463
 464 static struct named_pipe *open_named_pipe( const struct unicode_str *name, unsigned int attr )
 465 {
 466     struct object *obj;
 467
 468     if ((obj = find_object( sync_namespace, name, attr )))
 469     {
 470         if (obj->ops == &named_pipe_ops) return (struct named_pipe *)obj;
 471         release_object( obj );
 472         set_error( STATUS_OBJECT_TYPE_MISMATCH );
 473     }
 474     else set_error( STATUS_OBJECT_NAME_NOT_FOUND );
 475
 476     return NULL;
 477 }
 478
 479 static struct pipe_server *get_pipe_server_obj( struct process *process,
 480                                 obj_handle_t handle, unsigned int access )
 481 {
 482     struct object *obj;
 483     obj = get_handle_obj( process, handle, access, &pipe_server_ops );
 484     return (struct pipe_server *) obj;
 485 }
 486
 487 static struct pipe_server *create_pipe_server( struct named_pipe *pipe, unsigned int options )
 488 {
 489     struct pipe_server *server;
 490
 491     server = alloc_object( &pipe_server_ops );
 492     if (!server)
 493         return NULL;
 494
 495     server->fd = NULL;
 496     server->pipe = pipe;
 497     server->state = ps_idle_server;
 498     server->client = NULL;
 499     server->flush_poll = NULL;
 500     server->options = options;
 501     list_init( &server->wait_q );
 502
 503     list_add_head( &pipe->servers, &server->entry );
 504     grab_object( pipe );
 505
 506     return server;
 507 }
 508
 509 static struct pipe_client *create_pipe_client( struct pipe_server *server, unsigned int flags )
 510 {
 511     struct pipe_client *client;
 512
 513     client = alloc_object( &pipe_client_ops );
 514     if (!client)
 515         return NULL;
 516
 517     client->fd = NULL;
 518     client->server = server;
 519     client->flags = flags;
 520
 521     return client;
 522 }
 523
 524 static inline struct pipe_server *find_server( struct named_pipe *pipe, enum pipe_state state )
 525 {
 526     struct pipe_server *server;
 527
 528     LIST_FOR_EACH_ENTRY( server, &pipe->servers, struct pipe_server, entry )
 529     {
 530         if (server->state == state) return (struct pipe_server *)grab_object( server );
 531     }
 532     return NULL;
 533 }
 534
 535 static inline struct pipe_server *find_server2( struct named_pipe *pipe,
 536                                                 enum pipe_state state1, enum pipe_state state2 )
 537 {
 538     struct pipe_server *server;
 539
 540     LIST_FOR_EACH_ENTRY( server, &pipe->servers, struct pipe_server, entry )
 541     {
 542         if (server->state == state1 || server->state == state2)
 543             return (struct pipe_server *)grab_object( server );
 544     }
 545     return NULL;
 546 }
 547
 548 DECL_HANDLER(create_named_pipe)
 549 {
 550     struct named_pipe *pipe;
 551     struct pipe_server *server;
 552     struct unicode_str name;
 553
 554     reply->handle = 0;
 555     get_req_unicode_str( &name );
 556     if (!(pipe = create_named_pipe( &name, req->attributes ))) return;
 557
 558     if (get_error() != STATUS_OBJECT_NAME_EXISTS)
 559     {
 560         pipe->insize = req->insize;
 561         pipe->outsize = req->outsize;
 562         pipe->maxinstances = req->maxinstances;
 563         pipe->timeout = req->timeout;
 564         pipe->flags = req->flags;
 565     }
 566     else
 567     {
 568         if (pipe->maxinstances <= pipe->instances)
 569         {
 570             set_error( STATUS_INSTANCE_NOT_AVAILABLE );
 571             release_object( pipe );
 572             return;
 573         }
 574         if ((pipe->maxinstances != req->maxinstances) ||
 575             (pipe->timeout != req->timeout) ||
 576             (pipe->flags != req->flags))
 577         {
 578             set_error( STATUS_ACCESS_DENIED );
 579             release_object( pipe );
 580             return;
 581         }
 582         set_error( 0 );  /* clear the name collision */
 583     }
 584
 585     server = create_pipe_server( pipe, req->options );
 586     if (server)
 587     {
 588         reply->handle = alloc_handle( current->process, server,
 589                                       req->access, req->attributes & OBJ_INHERIT );
 590         server->pipe->instances++;
 591         release_object( server );
 592     }
 593
 594     release_object( pipe );
 595 }
 596
 597 DECL_HANDLER(open_named_pipe)
 598 {
 599     struct pipe_server *server;
 600     struct pipe_client *client;
 601     struct unicode_str name;
 602     struct named_pipe *pipe;
 603     int fds[2];
 604
 605     get_req_unicode_str( &name );
 606     if (!(pipe = open_named_pipe( &name, req->attributes ))) return;
 607
 608     server = find_server2( pipe, ps_idle_server, ps_wait_open );
 609     release_object( pipe );
 610
 611     if (!server)
 612     {
 613         set_error( STATUS_PIPE_NOT_AVAILABLE );
 614         return;
 615     }
 616
 617     client = create_pipe_client( server, req->flags );
 618     if (client)
 619     {
 620         if (!socketpair( PF_UNIX, SOCK_STREAM, 0, fds ))
 621         {
 622             int res = 0;
 623
 624             assert( !client->fd );
 625             assert( !server->fd );
 626
 627             /* for performance reasons, only set nonblocking mode when using
 628              * overlapped I/O. Otherwise, we will be doing too much busy
 629              * looping */
 630             if (is_overlapped( req->flags ))
 631                 res = fcntl( fds[1], F_SETFL, O_NONBLOCK );
 632             if ((res != -1) && is_overlapped( server->options ))
 633                 res = fcntl( fds[0], F_SETFL, O_NONBLOCK );
 634
 635             client->fd = create_anonymous_fd( &pipe_client_fd_ops,
 636                                             fds[1], &client->obj );
 637             server->fd = create_anonymous_fd( &pipe_server_fd_ops,
 638                                             fds[0], &server->obj );
 639             if (client->fd && server->fd && res != 1)
 640             {
 641                 if (server->state == ps_wait_open)
 642                     async_terminate_head( &server->wait_q, STATUS_SUCCESS );
 643                 assert( list_empty( &server->wait_q ) );
 644                 server->state = ps_connected_server;
 645                 server->client = client;
 646                 client->server = server;
 647                 reply->handle = alloc_handle( current->process, client,
 648                                               req->access, req->attributes & OBJ_INHERIT );
 649             }
 650         }
 651         else
 652             file_set_error();
 653
 654         release_object( client );
 655     }
 656     release_object( server );
 657 }
 658
 659 DECL_HANDLER(connect_named_pipe)
 660 {
 661     struct pipe_server *server;
 662
 663     server = get_pipe_server_obj(current->process, req->handle, 0);
 664     if (!server)
 665         return;
 666
 667     switch(server->state)
 668     {
 669     case ps_idle_server:
 670     case ps_wait_connect:
 671         assert( !server->fd );
 672         server->state = ps_wait_open;
 673         create_async( current, NULL, &server->wait_q,
 674                       req->func, req->event, NULL );
 675         async_terminate_queue( &server->pipe->waiters, STATUS_SUCCESS );
 676         break;
 677     case ps_connected_server:
 678         assert( server->fd );
 679         set_error( STATUS_PIPE_CONNECTED );
 680         break;
 681     case ps_disconnected_server:
 682         set_error( STATUS_PIPE_BUSY );
 683         break;
 684     case ps_wait_disconnect:
 685         set_error( STATUS_NO_DATA_DETECTED );
 686         break;
 687     case ps_wait_open:
 688         set_error( STATUS_INVALID_HANDLE );
 689         break;
 690     }
 691
 692     release_object(server);
 693 }
 694
 695 DECL_HANDLER(wait_named_pipe)
 696 {
 697     struct named_pipe *pipe;
 698     struct pipe_server *server;
 699     struct unicode_str name;
 700
 701     get_req_unicode_str( &name );
 702     if (!(pipe = open_named_pipe( &name, OBJ_CASE_INSENSITIVE )))
 703     {
 704         set_error( STATUS_PIPE_NOT_AVAILABLE );
 705         return;
 706     }
 707     server = find_server( pipe, ps_wait_open );
 708     if (server)
 709     {
 710         /* there's already a server waiting for a client to connect */
 711         thread_queue_apc( current, NULL, req->func, APC_ASYNC_IO,
 712                           1, req->overlapped, NULL, (void *)STATUS_SUCCESS );
 713         release_object( server );
 714     }
 715     else
 716     {
 717         int timeout;
 718         if (req->timeout == NMPWAIT_USE_DEFAULT_WAIT)
 719             timeout = pipe->timeout;
 720         else
 721             timeout = req->timeout;
 722
 723         if (req->timeout == NMPWAIT_WAIT_FOREVER)
 724             create_async( current, NULL, &pipe->waiters,
 725                           req->func, req->overlapped, NULL );
 726         else
 727             create_async( current, &timeout, &pipe->waiters,
 728                           req->func, req->overlapped, NULL );
 729     }
 730
 731     release_object( pipe );
 732 }
 733
 734 DECL_HANDLER(disconnect_named_pipe)
 735 {
 736     struct pipe_server *server;
 737
 738     reply->fd = -1;
 739     server = get_pipe_server_obj( current->process, req->handle, 0 );
 740     if (!server)
 741         return;
 742     switch(server->state)
 743     {
 744     case ps_connected_server:
 745         assert( server->fd );
 746         assert( server->client );
 747         assert( server->client->fd );
 748
 749         notify_empty( server );
 750
 751         /* Dump the client and server fds, but keep the pointers
 752            around - client loses all waiting data */
 753         server->state = ps_disconnected_server;
 754         do_disconnect( server );
 755         reply->fd = flush_cached_fd( current->process, req->handle );
 756         break;
 757
 758     case ps_wait_disconnect:
 759         assert( !server->client );
 760         assert( server->fd );
 761         do_disconnect( server );
 762         server->state = ps_wait_connect;
 763         reply->fd = flush_cached_fd( current->process, req->handle );
 764         break;
 765
 766     case ps_idle_server:
 767     case ps_wait_open:
 768     case ps_disconnected_server:
 769     case ps_wait_connect:
 770         set_error( STATUS_PIPE_DISCONNECTED );
 771         break;
 772     }
 773     release_object( server );
 774 }
 775
 776 DECL_HANDLER(get_named_pipe_info)
 777 {
 778     struct pipe_server *server;
 779
 780     server = get_pipe_server_obj( current->process, req->handle, 0 );
 781     if (!server)
 782         return;
 783
 784     reply->flags        = server->pipe->flags;
 785     reply->maxinstances = server->pipe->maxinstances;
 786     reply->insize       = server->pipe->insize;
 787     reply->outsize      = server->pipe->outsize;
 788
 789     release_object(server);
 790 }