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 "ntstatus.h"
  46 #define WIN32_NO_STATUS
  47 #include "windef.h"
  48 #include "winternl.h"
  49
  50 #include "file.h"
  51 #include "handle.h"
  52 #include "thread.h"
  53 #include "request.h"
  54
  55 enum pipe_state
  56 {
  57     ps_idle_server,
  58     ps_wait_open,
  59     ps_connected_server,
  60     ps_wait_disconnect,
  61     ps_disconnected_server,
  62     ps_wait_connect
  63 };
  64
  65 struct named_pipe;
  66
  67 struct pipe_server
  68 {
  69     struct object        obj;        /* object header */
  70     struct fd           *fd;         /* pipe file descriptor */
  71     struct list          entry;      /* entry in named pipe servers list */
  72     enum pipe_state      state;      /* server state */
  73     struct pipe_client  *client;     /* client that this server is connected to */
  74     struct named_pipe   *pipe;
  75     struct timeout_user *flush_poll;
  76     struct event        *event;
  77     struct list          wait_q;     /* only a single one can be queued */
  78     unsigned int         options;    /* pipe options */
  79 };
  80
  81 struct pipe_client
  82 {
  83     struct object        obj;        /* object header */
  84     struct fd           *fd;         /* pipe file descriptor */
  85     struct pipe_server  *server;     /* server that this client is connected to */
  86     unsigned int         flags;      /* file flags */
  87 };
  88
  89 struct named_pipe
  90 {
  91     struct object       obj;         /* object header */
  92     unsigned int        flags;
  93     unsigned int        maxinstances;
  94     unsigned int        outsize;
  95     unsigned int        insize;
  96     unsigned int        timeout;
  97     unsigned int        instances;
  98     struct list         servers;     /* list of servers using this pipe */
  99     struct list         waiters;     /* list of clients waiting to connect */
 100 };
 101
 102 struct named_pipe_device
 103 {
 104     struct object       obj;         /* object header */
 105     struct fd          *fd;          /* pseudo-fd for ioctls */
 106     struct namespace   *pipes;       /* named pipe namespace */
 107 };
 108
 109 static void named_pipe_dump( struct object *obj, int verbose );
 110 static unsigned int named_pipe_map_access( struct object *obj, unsigned int access );
 111 static void named_pipe_destroy( struct object *obj );
 112
 113 static const struct object_ops named_pipe_ops =
 114 {
 115     sizeof(struct named_pipe),    /* size */
 116     named_pipe_dump,              /* dump */
 117     no_add_queue,                 /* add_queue */
 118     NULL,                         /* remove_queue */
 119     NULL,                         /* signaled */
 120     NULL,                         /* satisfied */
 121     no_signal,                    /* signal */
 122     no_get_fd,                    /* get_fd */
 123     named_pipe_map_access,        /* map_access */
 124     no_lookup_name,               /* lookup_name */
 125     no_close_handle,              /* close_handle */
 126     named_pipe_destroy            /* destroy */
 127 };
 128
 129 /* functions common to server and client */
 130 static unsigned int pipe_map_access( struct object *obj, unsigned int access );
 131
 132 /* server end functions */
 133 static void pipe_server_dump( struct object *obj, int verbose );
 134 static struct fd *pipe_server_get_fd( struct object *obj );
 135 static void pipe_server_destroy( struct object *obj);
 136 static int pipe_server_flush( struct fd *fd, struct event **event );
 137 static int pipe_server_get_info( struct fd *fd );
 138
 139 static const struct object_ops pipe_server_ops =
 140 {
 141     sizeof(struct pipe_server),   /* size */
 142     pipe_server_dump,             /* dump */
 143     default_fd_add_queue,         /* add_queue */
 144     default_fd_remove_queue,      /* remove_queue */
 145     default_fd_signaled,          /* signaled */
 146     no_satisfied,                 /* satisfied */
 147     no_signal,                    /* signal */
 148     pipe_server_get_fd,           /* get_fd */
 149     pipe_map_access,              /* map_access */
 150     no_lookup_name,               /* lookup_name */
 151     no_close_handle,              /* close_handle */
 152     pipe_server_destroy           /* destroy */
 153 };
 154
 155 static const struct fd_ops pipe_server_fd_ops =
 156 {
 157     default_fd_get_poll_events,     /* get_poll_events */
 158     default_poll_event,           /* poll_event */
 159     pipe_server_flush,            /* flush */
 160     pipe_server_get_info,         /* get_file_info */
 161     default_fd_queue_async,       /* queue_async */
 162     default_fd_cancel_async,      /* cancel_async */
 163 };
 164
 165 /* client end functions */
 166 static void pipe_client_dump( struct object *obj, int verbose );
 167 static struct fd *pipe_client_get_fd( struct object *obj );
 168 static void pipe_client_destroy( struct object *obj );
 169 static int pipe_client_flush( struct fd *fd, struct event **event );
 170 static int pipe_client_get_info( struct fd *fd );
 171
 172 static const struct object_ops pipe_client_ops =
 173 {
 174     sizeof(struct pipe_client),   /* size */
 175     pipe_client_dump,             /* dump */
 176     default_fd_add_queue,         /* add_queue */
 177     default_fd_remove_queue,      /* remove_queue */
 178     default_fd_signaled,          /* signaled */
 179     no_satisfied,                 /* satisfied */
 180     no_signal,                    /* signal */
 181     pipe_client_get_fd,           /* get_fd */
 182     pipe_map_access,              /* map_access */
 183     no_lookup_name,               /* lookup_name */
 184     no_close_handle,              /* close_handle */
 185     pipe_client_destroy           /* destroy */
 186 };
 187
 188 static const struct fd_ops pipe_client_fd_ops =
 189 {
 190     default_fd_get_poll_events,   /* get_poll_events */
 191     default_poll_event,           /* poll_event */
 192     pipe_client_flush,            /* flush */
 193     pipe_client_get_info,         /* get_file_info */
 194     default_fd_queue_async,       /* queue_async */
 195     default_fd_cancel_async       /* cancel_async */
 196 };
 197
 198 static void named_pipe_device_dump( struct object *obj, int verbose );
 199 static struct fd *named_pipe_device_get_fd( struct object *obj );
 200 static struct object *named_pipe_device_lookup_name( struct object *obj,
 201     struct unicode_str *name, unsigned int attr );
 202 static void named_pipe_device_destroy( struct object *obj );
 203 static int named_pipe_device_get_file_info( struct fd *fd );
 204
 205 static const struct object_ops named_pipe_device_ops =
 206 {
 207     sizeof(struct named_pipe_device), /* size */
 208     named_pipe_device_dump,           /* dump */
 209     no_add_queue,                     /* add_queue */
 210     NULL,                             /* remove_queue */
 211     NULL,                             /* signaled */
 212     no_satisfied,                     /* satisfied */
 213     no_signal,                        /* signal */
 214     named_pipe_device_get_fd,         /* get_fd */
 215     pipe_map_access,                  /* map_access */
 216     named_pipe_device_lookup_name,    /* lookup_name */
 217     no_close_handle,                  /* close_handle */
 218     named_pipe_device_destroy         /* destroy */
 219 };
 220
 221 static const struct fd_ops named_pipe_device_fd_ops =
 222 {
 223     default_fd_get_poll_events,       /* get_poll_events */
 224     default_poll_event,               /* poll_event */
 225     no_flush,                         /* flush */
 226     named_pipe_device_get_file_info,  /* get_file_info */
 227     default_fd_queue_async,           /* queue_async */
 228     default_fd_cancel_async           /* cancel_async */
 229 };
 230
 231 static void named_pipe_dump( struct object *obj, int verbose )
 232 {
 233     struct named_pipe *pipe = (struct named_pipe *) obj;
 234     assert( obj->ops == &named_pipe_ops );
 235     fprintf( stderr, "Named pipe " );
 236     dump_object_name( &pipe->obj );
 237     fprintf( stderr, "\n" );
 238 }
 239
 240 static unsigned int named_pipe_map_access( struct object *obj, unsigned int access )
 241 {
 242     if (access & GENERIC_READ)    access |= STANDARD_RIGHTS_READ;
 243     if (access & GENERIC_WRITE)   access |= STANDARD_RIGHTS_WRITE | FILE_CREATE_PIPE_INSTANCE;
 244     if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE;
 245     if (access & GENERIC_ALL)     access |= STANDARD_RIGHTS_ALL;
 246     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 247 }
 248
 249 static void pipe_server_dump( struct object *obj, int verbose )
 250 {
 251     struct pipe_server *server = (struct pipe_server *) obj;
 252     assert( obj->ops == &pipe_server_ops );
 253     fprintf( stderr, "Named pipe server pipe=%p state=%d\n", server->pipe, server->state );
 254 }
 255
 256 static void pipe_client_dump( struct object *obj, int verbose )
 257 {
 258     struct pipe_client *client = (struct pipe_client *) obj;
 259     assert( obj->ops == &pipe_client_ops );
 260     fprintf( stderr, "Named pipe client server=%p\n", client->server );
 261 }
 262
 263 static void named_pipe_destroy( struct object *obj)
 264 {
 265     struct named_pipe *pipe = (struct named_pipe *) obj;
 266
 267     assert( list_empty( &pipe->servers ) );
 268     assert( !pipe->instances );
 269     async_terminate_queue( &pipe->waiters, STATUS_HANDLES_CLOSED );
 270 }
 271
 272 static struct fd *pipe_client_get_fd( struct object *obj )
 273 {
 274     struct pipe_client *client = (struct pipe_client *) obj;
 275     if (client->fd)
 276         return (struct fd *) grab_object( client->fd );
 277     set_error( STATUS_PIPE_DISCONNECTED );
 278     return NULL;
 279 }
 280
 281 static struct fd *pipe_server_get_fd( struct object *obj )
 282 {
 283     struct pipe_server *server = (struct pipe_server *) obj;
 284
 285     switch(server->state)
 286     {
 287     case ps_connected_server:
 288     case ps_wait_disconnect:
 289         assert( server->fd );
 290         return (struct fd *) grab_object( server->fd );
 291
 292     case ps_wait_open:
 293     case ps_idle_server:
 294         set_error( STATUS_PIPE_LISTENING );
 295         break;
 296
 297     case ps_disconnected_server:
 298     case ps_wait_connect:
 299         set_error( STATUS_PIPE_DISCONNECTED );
 300         break;
 301     }
 302     return NULL;
 303 }
 304
 305
 306 static void notify_empty( struct pipe_server *server )
 307 {
 308     if (!server->flush_poll)
 309         return;
 310     assert( server->state == ps_connected_server );
 311     assert( server->event );
 312     remove_timeout_user( server->flush_poll );
 313     server->flush_poll = NULL;
 314     set_event( server->event );
 315     release_object( server->event );
 316     server->event = NULL;
 317 }
 318
 319 static void do_disconnect( struct pipe_server *server )
 320 {
 321     /* we may only have a server fd, if the client disconnected */
 322     if (server->client)
 323     {
 324         assert( server->client->server == server );
 325         assert( server->client->fd );
 326         release_object( server->client->fd );
 327         server->client->fd = NULL;
 328     }
 329     assert( server->fd );
 330     release_object( server->fd );
 331     server->fd = NULL;
 332 }
 333
 334 static unsigned int pipe_map_access( struct object *obj, unsigned int access )
 335 {
 336     if (access & GENERIC_READ)    access |= FILE_GENERIC_READ;
 337     if (access & GENERIC_WRITE)   access |= FILE_GENERIC_WRITE;
 338     if (access & GENERIC_EXECUTE) access |= FILE_GENERIC_EXECUTE;
 339     if (access & GENERIC_ALL)     access |= FILE_ALL_ACCESS;
 340     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 341 }
 342
 343 static void pipe_server_destroy( struct object *obj)
 344 {
 345     struct pipe_server *server = (struct pipe_server *)obj;
 346
 347     assert( obj->ops == &pipe_server_ops );
 348
 349     if (server->fd)
 350     {
 351         notify_empty( server );
 352         do_disconnect( server );
 353     }
 354
 355     if (server->client)
 356     {
 357         server->client->server = NULL;
 358         server->client = NULL;
 359     }
 360
 361     async_terminate_head( &server->wait_q, STATUS_HANDLES_CLOSED );
 362
 363     assert( server->pipe->instances );
 364     server->pipe->instances--;
 365
 366     list_remove( &server->entry );
 367     release_object( server->pipe );
 368 }
 369
 370 static void pipe_client_destroy( struct object *obj)
 371 {
 372     struct pipe_client *client = (struct pipe_client *)obj;
 373     struct pipe_server *server = client->server;
 374
 375     assert( obj->ops == &pipe_client_ops );
 376
 377     if (server)
 378     {
 379         notify_empty( server );
 380
 381         switch(server->state)
 382         {
 383         case ps_connected_server:
 384             /* Don't destroy the server's fd here as we can't
 385                do a successful flush without it. */
 386             server->state = ps_wait_disconnect;
 387             release_object( client->fd );
 388             client->fd = NULL;
 389             break;
 390         case ps_disconnected_server:
 391             server->state = ps_wait_connect;
 392             break;
 393         case ps_idle_server:
 394         case ps_wait_open:
 395         case ps_wait_disconnect:
 396         case ps_wait_connect:
 397             assert( 0 );
 398         }
 399         assert( server->client );
 400         server->client = NULL;
 401         client->server = NULL;
 402     }
 403     assert( !client->fd );
 404 }
 405
 406 static void named_pipe_device_dump( struct object *obj, int verbose )
 407 {
 408     assert( obj->ops == &named_pipe_device_ops );
 409     fprintf( stderr, "Named pipe device\n" );
 410 }
 411
 412 static struct fd *named_pipe_device_get_fd( struct object *obj )
 413 {
 414     struct named_pipe_device *device = (struct named_pipe_device *)obj;
 415     return (struct fd *)grab_object( device->fd );
 416 }
 417
 418 static struct object *named_pipe_device_lookup_name( struct object *obj, struct unicode_str *name,
 419                                                      unsigned int attr )
 420 {
 421     struct named_pipe_device *device = (struct named_pipe_device*)obj;
 422     struct object *found;
 423
 424     assert( obj->ops == &named_pipe_device_ops );
 425     assert( device->pipes );
 426
 427     if ((found = find_object( device->pipes, name, attr | OBJ_CASE_INSENSITIVE )))
 428         name->len = 0;
 429
 430     return found;
 431 }
 432
 433 static void named_pipe_device_destroy( struct object *obj )
 434 {
 435     struct named_pipe_device *device = (struct named_pipe_device*)obj;
 436     assert( obj->ops == &named_pipe_device_ops );
 437     if (device->fd) release_object( device->fd );
 438     if (device->pipes) free( device->pipes );
 439 }
 440
 441 static int named_pipe_device_get_file_info( struct fd *fd )
 442 {
 443     return 0;
 444 }
 445
 446 struct named_pipe_device *create_named_pipe_device( struct directory *root,
 447                                                     const struct unicode_str *name )
 448 {
 449     struct named_pipe_device *dev;
 450
 451     if ((dev = create_named_object_dir( root, name, 0, &named_pipe_device_ops )) &&
 452         get_error() != STATUS_OBJECT_NAME_EXISTS)
 453     {
 454         dev->pipes = NULL;
 455         if (!(dev->fd = alloc_pseudo_fd( &named_pipe_device_fd_ops, &dev->obj )) ||
 456             !(dev->pipes = create_namespace( 7 )))
 457         {
 458             release_object( dev );
 459             dev = NULL;
 460         }
 461     }
 462     return dev;
 463 }
 464
 465 static int pipe_data_remaining( struct pipe_server *server )
 466 {
 467     struct pollfd pfd;
 468     int fd;
 469
 470     assert( server->client );
 471
 472     fd = get_unix_fd( server->client->fd );
 473     if (fd < 0)
 474         return 0;
 475     pfd.fd = fd;
 476     pfd.events = POLLIN;
 477     pfd.revents = 0;
 478
 479     if (0 > poll( &pfd, 1, 0 ))
 480         return 0;
 481
 482     return pfd.revents&POLLIN;
 483 }
 484
 485 static void check_flushed( void *arg )
 486 {
 487     struct pipe_server *server = (struct pipe_server*) arg;
 488
 489     assert( server->event );
 490     if (pipe_data_remaining( server ))
 491     {
 492         struct timeval tv;
 493
 494         gettimeofday( &tv, NULL );
 495         add_timeout( &tv, 100 );
 496         server->flush_poll = add_timeout_user( &tv, check_flushed, server );
 497     }
 498     else
 499     {
 500         /* notify_empty( server ); */
 501         server->flush_poll = NULL;
 502         set_event( server->event );
 503         release_object( server->event );
 504         server->event = NULL;
 505     }
 506 }
 507
 508 static int pipe_server_flush( struct fd *fd, struct event **event )
 509 {
 510     struct pipe_server *server = get_fd_user( fd );
 511
 512     if (!server)
 513         return 0;
 514
 515     if (server->state != ps_connected_server)
 516         return 0;
 517
 518     /* FIXME: if multiple threads flush the same pipe,
 519               maybe should create a list of processes to notify */
 520     if (server->flush_poll)
 521         return 0;
 522
 523     if (pipe_data_remaining( server ))
 524     {
 525         struct timeval tv;
 526
 527         /* this kind of sux -
 528            there's no unix way to be alerted when a pipe becomes empty */
 529         server->event = create_event( NULL, NULL, 0, 0, 0 );
 530         if (!server->event)
 531             return 0;
 532         gettimeofday( &tv, NULL );
 533         add_timeout( &tv, 100 );
 534         server->flush_poll = add_timeout_user( &tv, check_flushed, server );
 535         *event = server->event;
 536     }
 537
 538     return 0;
 539 }
 540
 541 static int pipe_client_flush( struct fd *fd, struct event **event )
 542 {
 543     /* FIXME: what do we have to do for this? */
 544     return 0;
 545 }
 546
 547 static inline int is_overlapped( unsigned int options )
 548 {
 549     return !(options & (FILE_SYNCHRONOUS_IO_ALERT | FILE_SYNCHRONOUS_IO_NONALERT));
 550 }
 551
 552 static int pipe_server_get_info( struct fd *fd )
 553 {
 554     struct pipe_server *server = get_fd_user( fd );
 555     int flags = FD_FLAG_AVAILABLE;
 556
 557     if (is_overlapped( server->options )) flags |= FD_FLAG_OVERLAPPED;
 558
 559     return flags;
 560 }
 561
 562 static int pipe_client_get_info( struct fd *fd )
 563 {
 564     struct pipe_client *client = get_fd_user( fd );
 565     int flags = FD_FLAG_AVAILABLE;
 566
 567     if (is_overlapped( client->flags )) flags |= FD_FLAG_OVERLAPPED;
 568
 569     return flags;
 570 }
 571
 572 static struct named_pipe *create_named_pipe( struct directory *root, const struct unicode_str *name,
 573                                              unsigned int attr )
 574 {
 575     struct object *obj;
 576     struct named_pipe *pipe = NULL;
 577     struct unicode_str new_name;
 578
 579     if (!name || !name->len) return alloc_object( &named_pipe_ops );
 580
 581     if (!(obj = find_object_dir( root, name, attr, &new_name ))) return NULL;
 582     if (!new_name.len)
 583     {
 584         if (attr & OBJ_OPENIF && obj->ops == &named_pipe_ops)
 585             set_error( STATUS_OBJECT_NAME_EXISTS );
 586         else
 587         {
 588             release_object( obj );
 589             obj = NULL;
 590             if (attr & OBJ_OPENIF)
 591                 set_error( STATUS_OBJECT_TYPE_MISMATCH );
 592             else
 593                 set_error( STATUS_OBJECT_NAME_COLLISION );
 594         }
 595         return (struct named_pipe *)obj;
 596     }
 597
 598     if (obj->ops != &named_pipe_device_ops)
 599         set_error( STATUS_OBJECT_TYPE_MISMATCH );
 600     else
 601     {
 602         struct named_pipe_device *dev = (struct named_pipe_device *)obj;
 603         if ((pipe = create_object( dev->pipes, &named_pipe_ops, &new_name, NULL )))
 604             clear_error();
 605     }
 606
 607     release_object( obj );
 608     return pipe;
 609 }
 610
 611 static struct pipe_server *get_pipe_server_obj( struct process *process,
 612                                 obj_handle_t handle, unsigned int access )
 613 {
 614     struct object *obj;
 615     obj = get_handle_obj( process, handle, access, &pipe_server_ops );
 616     return (struct pipe_server *) obj;
 617 }
 618
 619 static struct pipe_server *create_pipe_server( struct named_pipe *pipe, unsigned int options )
 620 {
 621     struct pipe_server *server;
 622
 623     server = alloc_object( &pipe_server_ops );
 624     if (!server)
 625         return NULL;
 626
 627     server->fd = NULL;
 628     server->pipe = pipe;
 629     server->state = ps_idle_server;
 630     server->client = NULL;
 631     server->flush_poll = NULL;
 632     server->options = options;
 633     list_init( &server->wait_q );
 634
 635     list_add_head( &pipe->servers, &server->entry );
 636     grab_object( pipe );
 637
 638     return server;
 639 }
 640
 641 static struct pipe_client *create_pipe_client( struct pipe_server *server, unsigned int flags )
 642 {
 643     struct pipe_client *client;
 644
 645     client = alloc_object( &pipe_client_ops );
 646     if (!client)
 647         return NULL;
 648
 649     client->fd = NULL;
 650     client->server = server;
 651     client->flags = flags;
 652
 653     return client;
 654 }
 655
 656 static inline struct pipe_server *find_server( struct named_pipe *pipe, enum pipe_state state )
 657 {
 658     struct pipe_server *server;
 659
 660     LIST_FOR_EACH_ENTRY( server, &pipe->servers, struct pipe_server, entry )
 661     {
 662         if (server->state == state) return (struct pipe_server *)grab_object( server );
 663     }
 664     return NULL;
 665 }
 666
 667 static inline struct pipe_server *find_server2( struct named_pipe *pipe,
 668                                                 enum pipe_state state1, enum pipe_state state2 )
 669 {
 670     struct pipe_server *server;
 671
 672     LIST_FOR_EACH_ENTRY( server, &pipe->servers, struct pipe_server, entry )
 673     {
 674         if (server->state == state1 || server->state == state2)
 675             return (struct pipe_server *)grab_object( server );
 676     }
 677     return NULL;
 678 }
 679
 680 DECL_HANDLER(create_named_pipe)
 681 {
 682     struct named_pipe *pipe;
 683     struct pipe_server *server;
 684     struct unicode_str name;
 685     struct directory *root = NULL;
 686
 687     reply->handle = 0;
 688     get_req_unicode_str( &name );
 689     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
 690         return;
 691
 692     pipe = create_named_pipe( root, &name, req->attributes | OBJ_OPENIF );
 693
 694     if (root) release_object( root );
 695     if (!pipe) return;
 696
 697     if (get_error() != STATUS_OBJECT_NAME_EXISTS)
 698     {
 699         /* initialize it if it didn't already exist */
 700         pipe->instances = 0;
 701         list_init( &pipe->servers );
 702         list_init( &pipe->waiters );
 703         pipe->insize = req->insize;
 704         pipe->outsize = req->outsize;
 705         pipe->maxinstances = req->maxinstances;
 706         pipe->timeout = req->timeout;
 707         pipe->flags = req->flags;
 708     }
 709     else
 710     {
 711         if (pipe->maxinstances <= pipe->instances)
 712         {
 713             set_error( STATUS_INSTANCE_NOT_AVAILABLE );
 714             release_object( pipe );
 715             return;
 716         }
 717         if ((pipe->maxinstances != req->maxinstances) ||
 718             (pipe->timeout != req->timeout) ||
 719             (pipe->flags != req->flags))
 720         {
 721             set_error( STATUS_ACCESS_DENIED );
 722             release_object( pipe );
 723             return;
 724         }
 725         set_error( 0 );  /* clear the name collision */
 726     }
 727
 728     server = create_pipe_server( pipe, req->options );
 729     if (server)
 730     {
 731         reply->handle = alloc_handle( current->process, server, req->access, req->attributes );
 732         server->pipe->instances++;
 733         release_object( server );
 734     }
 735
 736     release_object( pipe );
 737 }
 738
 739 DECL_HANDLER(open_named_pipe)
 740 {
 741     struct pipe_server *server;
 742     struct pipe_client *client;
 743     struct unicode_str name;
 744     struct directory *root = NULL;
 745     struct named_pipe *pipe;
 746     int fds[2];
 747
 748     get_req_unicode_str( &name );
 749     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
 750         return;
 751
 752     pipe = open_object_dir( root, &name, req->attributes, &named_pipe_ops );
 753
 754     if (root) release_object( root );
 755     if (!pipe) return;
 756
 757     server = find_server2( pipe, ps_idle_server, ps_wait_open );
 758     release_object( pipe );
 759
 760     if (!server)
 761     {
 762         set_error( STATUS_PIPE_NOT_AVAILABLE );
 763         return;
 764     }
 765
 766     client = create_pipe_client( server, req->flags );
 767     if (client)
 768     {
 769         if (!socketpair( PF_UNIX, SOCK_STREAM, 0, fds ))
 770         {
 771             int res = 0;
 772
 773             assert( !client->fd );
 774             assert( !server->fd );
 775
 776             /* for performance reasons, only set nonblocking mode when using
 777              * overlapped I/O. Otherwise, we will be doing too much busy
 778              * looping */
 779             if (is_overlapped( req->flags ))
 780                 res = fcntl( fds[1], F_SETFL, O_NONBLOCK );
 781             if ((res != -1) && is_overlapped( server->options ))
 782                 res = fcntl( fds[0], F_SETFL, O_NONBLOCK );
 783
 784             client->fd = create_anonymous_fd( &pipe_client_fd_ops,
 785                                             fds[1], &client->obj );
 786             server->fd = create_anonymous_fd( &pipe_server_fd_ops,
 787                                             fds[0], &server->obj );
 788             if (client->fd && server->fd && res != 1)
 789             {
 790                 if (server->state == ps_wait_open)
 791                     async_terminate_head( &server->wait_q, STATUS_SUCCESS );
 792                 assert( list_empty( &server->wait_q ) );
 793                 server->state = ps_connected_server;
 794                 server->client = client;
 795                 client->server = server;
 796                 reply->handle = alloc_handle( current->process, client, req->access, req->attributes );
 797             }
 798         }
 799         else
 800             file_set_error();
 801
 802         release_object( client );
 803     }
 804     release_object( server );
 805 }
 806
 807 DECL_HANDLER(connect_named_pipe)
 808 {
 809     struct pipe_server *server;
 810
 811     server = get_pipe_server_obj(current->process, req->handle, 0);
 812     if (!server)
 813         return;
 814
 815     switch(server->state)
 816     {
 817     case ps_idle_server:
 818     case ps_wait_connect:
 819         assert( !server->fd );
 820         server->state = ps_wait_open;
 821         create_async( current, NULL, &server->wait_q,
 822                       req->func, req->event, NULL );
 823         async_terminate_queue( &server->pipe->waiters, STATUS_SUCCESS );
 824         break;
 825     case ps_connected_server:
 826         assert( server->fd );
 827         set_error( STATUS_PIPE_CONNECTED );
 828         break;
 829     case ps_disconnected_server:
 830         set_error( STATUS_PIPE_BUSY );
 831         break;
 832     case ps_wait_disconnect:
 833         set_error( STATUS_NO_DATA_DETECTED );
 834         break;
 835     case ps_wait_open:
 836         set_error( STATUS_INVALID_HANDLE );
 837         break;
 838     }
 839
 840     release_object(server);
 841 }
 842
 843 DECL_HANDLER(wait_named_pipe)
 844 {
 845     struct named_pipe_device *device;
 846     struct named_pipe *pipe;
 847     struct pipe_server *server;
 848     struct unicode_str name;
 849
 850     device = (struct named_pipe_device *)get_handle_obj( current->process, req->handle,
 851                                                          FILE_READ_ATTRIBUTES, &named_pipe_device_ops );
 852     if (!device) return;
 853
 854     get_req_unicode_str( &name );
 855     pipe = (struct named_pipe *)find_object( device->pipes, &name, OBJ_CASE_INSENSITIVE );
 856     release_object( device );
 857     if (!pipe)
 858     {
 859         set_error( STATUS_PIPE_NOT_AVAILABLE );
 860         return;
 861     }
 862     server = find_server( pipe, ps_wait_open );
 863     if (server)
 864     {
 865         /* there's already a server waiting for a client to connect */
 866         thread_queue_apc( current, NULL, req->func, APC_ASYNC_IO,
 867                           1, req->event, NULL, (void *)STATUS_SUCCESS );
 868         release_object( server );
 869     }
 870     else
 871     {
 872         int timeout;
 873         if (req->timeout == NMPWAIT_USE_DEFAULT_WAIT)
 874             timeout = pipe->timeout;
 875         else
 876             timeout = req->timeout;
 877
 878         if (req->timeout == NMPWAIT_WAIT_FOREVER)
 879             create_async( current, NULL, &pipe->waiters,
 880                           req->func, req->event, NULL );
 881         else
 882             create_async( current, &timeout, &pipe->waiters,
 883                           req->func, req->event, NULL );
 884     }
 885
 886     release_object( pipe );
 887 }
 888
 889 DECL_HANDLER(disconnect_named_pipe)
 890 {
 891     struct pipe_server *server;
 892
 893     reply->fd = -1;
 894     server = get_pipe_server_obj( current->process, req->handle, 0 );
 895     if (!server)
 896         return;
 897     switch(server->state)
 898     {
 899     case ps_connected_server:
 900         assert( server->fd );
 901         assert( server->client );
 902         assert( server->client->fd );
 903
 904         notify_empty( server );
 905
 906         /* Dump the client and server fds, but keep the pointers
 907            around - client loses all waiting data */
 908         server->state = ps_disconnected_server;
 909         do_disconnect( server );
 910         reply->fd = flush_cached_fd( current->process, req->handle );
 911         break;
 912
 913     case ps_wait_disconnect:
 914         assert( !server->client );
 915         assert( server->fd );
 916         do_disconnect( server );
 917         server->state = ps_wait_connect;
 918         reply->fd = flush_cached_fd( current->process, req->handle );
 919         break;
 920
 921     case ps_idle_server:
 922     case ps_wait_open:
 923     case ps_disconnected_server:
 924     case ps_wait_connect:
 925         set_error( STATUS_PIPE_DISCONNECTED );
 926         break;
 927     }
 928     release_object( server );
 929 }
 930
 931 DECL_HANDLER(get_named_pipe_info)
 932 {
 933     struct pipe_server *server;
 934
 935     server = get_pipe_server_obj( current->process, req->handle, 0 );
 936     if (!server)
 937         return;
 938
 939     reply->flags        = server->pipe->flags;
 940     reply->maxinstances = server->pipe->maxinstances;
 941     reply->insize       = server->pipe->insize;
 942     reply->outsize      = server->pipe->outsize;
 943
 944     release_object(server);
 945 }