server/sock.c

   1 /*
   2  * Server-side socket management
   3  *
   4  * Copyright (C) 1999 Marcus Meissner, Ove Kåven
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  *
  20  * FIXME: we use read|write access in all cases. Shouldn't we depend that
  21  * on the access of the current handle?
  22  */
  23
  24 #include "config.h"
  25
  26 #include <assert.h>
  27 #include <fcntl.h>
  28 #include <stdarg.h>
  29 #include <stdio.h>
  30 #include <string.h>
  31 #include <stdlib.h>
  32 #include <errno.h>
  33 #ifdef HAVE_SYS_ERRNO_H
  34 # include <sys/errno.h>
  35 #endif
  36 #include <sys/time.h>
  37 #include <sys/types.h>
  38 #ifdef HAVE_SYS_SOCKET_H
  39 # include <sys/socket.h>
  40 #endif
  41 #ifdef HAVE_SYS_IOCTL_H
  42 #include <sys/ioctl.h>
  43 #endif
  44 #ifdef HAVE_SYS_FILIO_H
  45 # include <sys/filio.h>
  46 #endif
  47 #include <time.h>
  48 #include <unistd.h>
  49
  50 #include "ntstatus.h"
  51 #define WIN32_NO_STATUS
  52 #include "windef.h"
  53 #include "winternl.h"
  54
  55 #include "process.h"
  56 #include "file.h"
  57 #include "handle.h"
  58 #include "thread.h"
  59 #include "request.h"
  60 #include "user.h"
  61
  62 /* To avoid conflicts with the Unix socket headers. Plus we only need a few
  63  * macros anyway.
  64  */
  65 #define USE_WS_PREFIX
  66 #include "winsock2.h"
  67
  68 struct sock
  69 {
  70     struct object       obj;         /* object header */
  71     struct fd          *fd;          /* socket file descriptor */
  72     unsigned int        state;       /* status bits */
  73     unsigned int        mask;        /* event mask */
  74     unsigned int        hmask;       /* held (blocked) events */
  75     unsigned int        pmask;       /* pending events */
  76     unsigned int        flags;       /* socket flags */
  77     int                 polling;     /* is socket being polled? */
  78     unsigned short      type;        /* socket type */
  79     unsigned short      family;      /* socket family */
  80     struct event       *event;       /* event object */
  81     user_handle_t       window;      /* window to send the message to */
  82     unsigned int        message;     /* message to send */
  83     obj_handle_t        wparam;      /* message wparam (socket handle) */
  84     int                 errors[FD_MAX_EVENTS]; /* event errors */
  85     struct sock        *deferred;    /* socket that waits for a deferred accept */
  86     struct async_queue *read_q;      /* queue for asynchronous reads */
  87     struct async_queue *write_q;     /* queue for asynchronous writes */
  88 };
  89
  90 static void sock_dump( struct object *obj, int verbose );
  91 static int sock_signaled( struct object *obj, struct thread *thread );
  92 static struct fd *sock_get_fd( struct object *obj );
  93 static unsigned int sock_map_access( struct object *obj, unsigned int access );
  94 static void sock_destroy( struct object *obj );
  95
  96 static int sock_get_poll_events( struct fd *fd );
  97 static void sock_poll_event( struct fd *fd, int event );
  98 static enum server_fd_type sock_get_fd_type( struct fd *fd );
  99 static void sock_queue_async( struct fd *fd, const async_data_t *data, int type, int count );
 100 static void sock_reselect_async( struct fd *fd, struct async_queue *queue );
 101 static void sock_cancel_async( struct fd *fd );
 102
 103 static int sock_get_error( int err );
 104 static void sock_set_error(void);
 105
 106 static const struct object_ops sock_ops =
 107 {
 108     sizeof(struct sock),          /* size */
 109     sock_dump,                    /* dump */
 110     add_queue,                    /* add_queue */
 111     remove_queue,                 /* remove_queue */
 112     sock_signaled,                /* signaled */
 113     no_satisfied,                 /* satisfied */
 114     no_signal,                    /* signal */
 115     sock_get_fd,                  /* get_fd */
 116     sock_map_access,              /* map_access */
 117     no_lookup_name,               /* lookup_name */
 118     no_open_file,                 /* open_file */
 119     fd_close_handle,              /* close_handle */
 120     sock_destroy                  /* destroy */
 121 };
 122
 123 static const struct fd_ops sock_fd_ops =
 124 {
 125     sock_get_poll_events,         /* get_poll_events */
 126     sock_poll_event,              /* poll_event */
 127     no_flush,                     /* flush */
 128     sock_get_fd_type,             /* get_file_info */
 129     default_fd_ioctl,             /* ioctl */
 130     sock_queue_async,             /* queue_async */
 131     sock_reselect_async,          /* reselect_async */
 132     sock_cancel_async             /* cancel_async */
 133 };
 134
 135
 136 /* Permutation of 0..FD_MAX_EVENTS - 1 representing the order in which
 137  * we post messages if there are multiple events.  Used to send
 138  * messages.  The problem is if there is both a FD_CONNECT event and,
 139  * say, an FD_READ event available on the same socket, we want to
 140  * notify the app of the connect event first.  Otherwise it may
 141  * discard the read event because it thinks it hasn't connected yet.
 142  */
 143 static const int event_bitorder[FD_MAX_EVENTS] =
 144 {
 145     FD_CONNECT_BIT,
 146     FD_ACCEPT_BIT,
 147     FD_OOB_BIT,
 148     FD_WRITE_BIT,
 149     FD_READ_BIT,
 150     FD_CLOSE_BIT,
 151     6, 7, 8, 9  /* leftovers */
 152 };
 153
 154 /* Flags that make sense only for SOCK_STREAM sockets */
 155 #define STREAM_FLAG_MASK ((unsigned int) (FD_CONNECT | FD_ACCEPT | FD_WINE_LISTENING | FD_WINE_CONNECTED))
 156
 157 typedef enum {
 158     SOCK_SHUTDOWN_ERROR = -1,
 159     SOCK_SHUTDOWN_EOF = 0,
 160     SOCK_SHUTDOWN_POLLHUP = 1
 161 } sock_shutdown_t;
 162
 163 static sock_shutdown_t sock_shutdown_type = SOCK_SHUTDOWN_ERROR;
 164
 165 static sock_shutdown_t sock_check_pollhup(void)
 166 {
 167     sock_shutdown_t ret = SOCK_SHUTDOWN_ERROR;
 168     int fd[2], n;
 169     struct pollfd pfd;
 170     char dummy;
 171
 172     if ( socketpair( AF_UNIX, SOCK_STREAM, 0, fd ) ) goto out;
 173     if ( shutdown( fd[0], 1 ) ) goto out;
 174
 175     pfd.fd = fd[1];
 176     pfd.events = POLLIN;
 177     pfd.revents = 0;
 178
 179     n = poll( &pfd, 1, 0 );
 180     if ( n != 1 ) goto out; /* error or timeout */
 181     if ( pfd.revents & POLLHUP )
 182         ret = SOCK_SHUTDOWN_POLLHUP;
 183     else if ( pfd.revents & POLLIN &&
 184               read( fd[1], &dummy, 1 ) == 0 )
 185         ret = SOCK_SHUTDOWN_EOF;
 186
 187 out:
 188     close( fd[0] );
 189     close( fd[1] );
 190     return ret;
 191 }
 192
 193 void sock_init(void)
 194 {
 195     sock_shutdown_type = sock_check_pollhup();
 196
 197     switch ( sock_shutdown_type )
 198     {
 199     case SOCK_SHUTDOWN_EOF:
 200         if (debug_level) fprintf( stderr, "sock_init: shutdown() causes EOF\n" );
 201         break;
 202     case SOCK_SHUTDOWN_POLLHUP:
 203         if (debug_level) fprintf( stderr, "sock_init: shutdown() causes POLLHUP\n" );
 204         break;
 205     default:
 206         fprintf( stderr, "sock_init: ERROR in sock_check_pollhup()\n" );
 207         sock_shutdown_type = SOCK_SHUTDOWN_EOF;
 208     }
 209 }
 210
 211 static int sock_reselect( struct sock *sock )
 212 {
 213     int ev = sock_get_poll_events( sock->fd );
 214
 215     if (debug_level)
 216         fprintf(stderr,"sock_reselect(%p): new mask %x\n", sock, ev);
 217
 218     if (!sock->polling)  /* FIXME: should find a better way to do this */
 219     {
 220         /* previously unconnected socket, is this reselect supposed to connect it? */
 221         if (!(sock->state & ~FD_WINE_NONBLOCKING)) return 0;
 222         /* ok, it is, attach it to the wineserver's main poll loop */
 223         sock->polling = 1;
 224     }
 225     /* update condition mask */
 226     set_fd_events( sock->fd, ev );
 227     return ev;
 228 }
 229
 230 /* After POLLHUP is received, the socket will no longer be in the main select loop.
 231    This function is used to signal pending events nevertheless */
 232 static void sock_try_event( struct sock *sock, int event )
 233 {
 234     event = check_fd_events( sock->fd, event );
 235     if (event)
 236     {
 237         if ( debug_level ) fprintf( stderr, "sock_try_event: %x\n", event );
 238         sock_poll_event( sock->fd, event );
 239     }
 240 }
 241
 242 /* wake anybody waiting on the socket event or send the associated message */
 243 static void sock_wake_up( struct sock *sock, int pollev )
 244 {
 245     unsigned int events = sock->pmask & sock->mask;
 246     int i;
 247     int async_active = 0;
 248
 249     if ( pollev & (POLLIN|POLLPRI) && async_waiting( sock->read_q ))
 250     {
 251         if (debug_level) fprintf( stderr, "activating read queue for socket %p\n", sock );
 252         async_wake_up( sock->read_q, STATUS_ALERTED );
 253         async_active = 1;
 254     }
 255     if ( pollev & POLLOUT && async_waiting( sock->write_q ))
 256     {
 257         if (debug_level) fprintf( stderr, "activating write queue for socket %p\n", sock );
 258         async_wake_up( sock->write_q, STATUS_ALERTED );
 259         async_active = 1;
 260     }
 261
 262     /* Do not signal events if there are still pending asynchronous IO requests */
 263     /* We need this to delay FD_CLOSE events until all pending overlapped requests are processed */
 264     if ( !events || async_active ) return;
 265
 266     if (sock->event)
 267     {
 268         if (debug_level) fprintf(stderr, "signalling events %x ptr %p\n", events, sock->event );
 269         set_event( sock->event );
 270     }
 271     if (sock->window)
 272     {
 273         if (debug_level) fprintf(stderr, "signalling events %x win %p\n", events, sock->window );
 274         for (i = 0; i < FD_MAX_EVENTS; i++)
 275         {
 276             int event = event_bitorder[i];
 277             if (sock->pmask & (1 << event))
 278             {
 279                 unsigned int lparam = (1 << event) | (sock->errors[event] << 16);
 280                 post_message( sock->window, sock->message, (unsigned long)sock->wparam, lparam );
 281             }
 282         }
 283         sock->pmask = 0;
 284         sock_reselect( sock );
 285     }
 286 }
 287
 288 static inline int sock_error( struct fd *fd )
 289 {
 290     unsigned int optval = 0, optlen;
 291
 292     optlen = sizeof(optval);
 293     getsockopt( get_unix_fd(fd), SOL_SOCKET, SO_ERROR, (void *) &optval, &optlen);
 294     return optval ? sock_get_error(optval) : 0;
 295 }
 296
 297 static void sock_poll_event( struct fd *fd, int event )
 298 {
 299     struct sock *sock = get_fd_user( fd );
 300     int hangup_seen = 0;
 301
 302     assert( sock->obj.ops == &sock_ops );
 303     if (debug_level)
 304         fprintf(stderr, "socket %p select event: %x\n", sock, event);
 305     if (sock->state & FD_CONNECT)
 306     {
 307         /* connecting */
 308         if (event & POLLOUT)
 309         {
 310             /* we got connected */
 311             sock->state |= FD_WINE_CONNECTED|FD_READ|FD_WRITE;
 312             sock->state &= ~FD_CONNECT;
 313             sock->pmask |= FD_CONNECT;
 314             sock->errors[FD_CONNECT_BIT] = 0;
 315             if (debug_level)
 316                 fprintf(stderr, "socket %p connection success\n", sock);
 317         }
 318         else if (event & (POLLERR|POLLHUP))
 319         {
 320             /* we didn't get connected? */
 321             sock->state &= ~FD_CONNECT;
 322             sock->pmask |= FD_CONNECT;
 323             sock->errors[FD_CONNECT_BIT] = sock_error( fd );
 324             if (debug_level)
 325                 fprintf(stderr, "socket %p connection failure\n", sock);
 326         }
 327     }
 328     else if (sock->state & FD_WINE_LISTENING)
 329     {
 330         /* listening */
 331         if (event & POLLIN)
 332         {
 333             /* incoming connection */
 334             sock->pmask |= FD_ACCEPT;
 335             sock->errors[FD_ACCEPT_BIT] = 0;
 336             sock->hmask |= FD_ACCEPT;
 337         }
 338         else if (event & (POLLERR|POLLHUP))
 339         {
 340             /* failed incoming connection? */
 341             sock->pmask |= FD_ACCEPT;
 342             sock->errors[FD_ACCEPT_BIT] = sock_error( fd );
 343             sock->hmask |= FD_ACCEPT;
 344         }
 345     }
 346     else
 347     {
 348         /* normal data flow */
 349         if ( sock->type == SOCK_STREAM && ( event & POLLIN ) )
 350         {
 351             char dummy;
 352             int nr;
 353
 354             /* Linux 2.4 doesn't report POLLHUP if only one side of the socket
 355              * has been closed, so we need to check for it explicitly here */
 356             nr  = recv( get_unix_fd( fd ), &dummy, 1, MSG_PEEK );
 357             if ( nr > 0 )
 358             {
 359                 /* incoming data */
 360                 sock->pmask |= FD_READ;
 361                 sock->hmask |= (FD_READ|FD_CLOSE);
 362                 sock->errors[FD_READ_BIT] = 0;
 363                 if (debug_level)
 364                     fprintf(stderr, "socket %p is readable\n", sock );
 365             }
 366             else if ( nr == 0 )
 367                 hangup_seen = 1;
 368             else
 369             {
 370                 /* EAGAIN can happen if an async recv() falls between the server's poll()
 371                    call and the invocation of this routine */
 372                 if ( errno == EAGAIN )
 373                     event &= ~POLLIN;
 374                 else
 375                 {
 376                     if ( debug_level )
 377                         fprintf( stderr, "recv error on socket %p: %d\n", sock, errno );
 378                     event = POLLERR;
 379                 }
 380             }
 381
 382         }
 383         else if ( sock_shutdown_type == SOCK_SHUTDOWN_POLLHUP && (event & POLLHUP) )
 384         {
 385             hangup_seen = 1;
 386         }
 387         else if ( event & POLLIN ) /* POLLIN for non-stream socket */
 388         {
 389             sock->pmask |= FD_READ;
 390             sock->hmask |= (FD_READ|FD_CLOSE);
 391             sock->errors[FD_READ_BIT] = 0;
 392             if (debug_level)
 393                 fprintf(stderr, "socket %p is readable\n", sock );
 394
 395         }
 396
 397         if (event & POLLOUT)
 398         {
 399             sock->pmask |= FD_WRITE;
 400             sock->hmask |= FD_WRITE;
 401             sock->errors[FD_WRITE_BIT] = 0;
 402             if (debug_level)
 403                 fprintf(stderr, "socket %p is writable\n", sock);
 404         }
 405         if (event & POLLPRI)
 406         {
 407             sock->pmask |= FD_OOB;
 408             sock->hmask |= FD_OOB;
 409             sock->errors[FD_OOB_BIT] = 0;
 410             if (debug_level)
 411                 fprintf(stderr, "socket %p got OOB data\n", sock);
 412         }
 413         /* According to WS2 specs, FD_CLOSE is only delivered when there is
 414            no more data to be read (i.e. hangup_seen = 1) */
 415         else if ( hangup_seen && (sock->state & (FD_READ|FD_WRITE) ))
 416         {
 417             sock->errors[FD_CLOSE_BIT] = sock_error( fd );
 418             if ( (event & POLLERR) || ( sock_shutdown_type == SOCK_SHUTDOWN_EOF && (event & POLLHUP) ))
 419                 sock->state &= ~FD_WRITE;
 420             sock->pmask |= FD_CLOSE;
 421             sock->hmask |= FD_CLOSE;
 422             if (debug_level)
 423                 fprintf(stderr, "socket %p aborted by error %d, event: %x - removing from select loop\n",
 424                         sock, sock->errors[FD_CLOSE_BIT], event);
 425         }
 426     }
 427
 428     if ( sock->pmask & FD_CLOSE || event & (POLLERR|POLLHUP) )
 429     {
 430         if ( debug_level )
 431             fprintf( stderr, "removing socket %p from select loop\n", sock );
 432         set_fd_events( sock->fd, -1 );
 433     }
 434     else
 435         sock_reselect( sock );
 436
 437     /* wake up anyone waiting for whatever just happened */
 438     if ( sock->pmask & sock->mask || sock->flags & WSA_FLAG_OVERLAPPED ) sock_wake_up( sock, event );
 439
 440     /* if anyone is stupid enough to wait on the socket object itself,
 441      * maybe we should wake them up too, just in case? */
 442     wake_up( &sock->obj, 0 );
 443 }
 444
 445 static void sock_dump( struct object *obj, int verbose )
 446 {
 447     struct sock *sock = (struct sock *)obj;
 448     assert( obj->ops == &sock_ops );
 449     printf( "Socket fd=%p, state=%x, mask=%x, pending=%x, held=%x\n",
 450             sock->fd, sock->state,
 451             sock->mask, sock->pmask, sock->hmask );
 452 }
 453
 454 static int sock_signaled( struct object *obj, struct thread *thread )
 455 {
 456     struct sock *sock = (struct sock *)obj;
 457     assert( obj->ops == &sock_ops );
 458
 459     return check_fd_events( sock->fd, sock_get_poll_events( sock->fd ) ) != 0;
 460 }
 461
 462 static unsigned int sock_map_access( struct object *obj, unsigned int access )
 463 {
 464     if (access & GENERIC_READ)    access |= FILE_GENERIC_READ;
 465     if (access & GENERIC_WRITE)   access |= FILE_GENERIC_WRITE;
 466     if (access & GENERIC_EXECUTE) access |= FILE_GENERIC_EXECUTE;
 467     if (access & GENERIC_ALL)     access |= FILE_ALL_ACCESS;
 468     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 469 }
 470
 471 static int sock_get_poll_events( struct fd *fd )
 472 {
 473     struct sock *sock = get_fd_user( fd );
 474     unsigned int mask = sock->mask & sock->state & ~sock->hmask;
 475     int ev = 0;
 476
 477     assert( sock->obj.ops == &sock_ops );
 478
 479     if (sock->state & FD_CONNECT)
 480         /* connecting, wait for writable */
 481         return POLLOUT;
 482     if (sock->state & FD_WINE_LISTENING)
 483         /* listening, wait for readable */
 484         return (sock->hmask & FD_ACCEPT) ? 0 : POLLIN;
 485
 486     if (mask & FD_READ  || async_waiting( sock->read_q )) ev |= POLLIN | POLLPRI;
 487     if (mask & FD_WRITE || async_waiting( sock->write_q )) ev |= POLLOUT;
 488     /* We use POLLIN with 0 bytes recv() as FD_CLOSE indication for stream sockets. */
 489     if ( sock->type == SOCK_STREAM && ( sock->mask & ~sock->hmask & FD_CLOSE) )
 490         ev |= POLLIN;
 491
 492     return ev;
 493 }
 494
 495 static enum server_fd_type sock_get_fd_type( struct fd *fd )
 496 {
 497     return FD_TYPE_SOCKET;
 498 }
 499
 500 static void sock_queue_async( struct fd *fd, const async_data_t *data, int type, int count )
 501 {
 502     struct sock *sock = get_fd_user( fd );
 503     struct async_queue *queue;
 504     int pollev;
 505
 506     assert( sock->obj.ops == &sock_ops );
 507
 508     switch (type)
 509     {
 510     case ASYNC_TYPE_READ:
 511         if (!sock->read_q && !(sock->read_q = create_async_queue( sock->fd ))) return;
 512         queue = sock->read_q;
 513         sock->hmask &= ~FD_CLOSE;
 514         break;
 515     case ASYNC_TYPE_WRITE:
 516         if (!sock->write_q && !(sock->write_q = create_async_queue( sock->fd ))) return;
 517         queue = sock->write_q;
 518         break;
 519     default:
 520         set_error( STATUS_INVALID_PARAMETER );
 521         return;
 522     }
 523
 524     if ( ( !( sock->state & FD_READ ) && type == ASYNC_TYPE_READ  ) ||
 525          ( !( sock->state & FD_WRITE ) && type == ASYNC_TYPE_WRITE ) )
 526     {
 527         set_error( STATUS_PIPE_DISCONNECTED );
 528     }
 529     else
 530     {
 531         struct async *async;
 532         if (!(async = create_async( current, queue, data ))) return;
 533         release_object( async );
 534         set_error( STATUS_PENDING );
 535     }
 536
 537     pollev = sock_reselect( sock );
 538     if ( pollev ) sock_try_event( sock, pollev );
 539 }
 540
 541 static void sock_reselect_async( struct fd *fd, struct async_queue *queue )
 542 {
 543     struct sock *sock = get_fd_user( fd );
 544     int events = sock_reselect( sock );
 545     if (events) sock_try_event( sock, events );
 546 }
 547
 548 static void sock_cancel_async( struct fd *fd )
 549 {
 550     struct sock *sock = get_fd_user( fd );
 551     assert( sock->obj.ops == &sock_ops );
 552
 553     async_wake_up( sock->read_q, STATUS_CANCELLED );
 554     async_wake_up( sock->write_q, STATUS_CANCELLED );
 555 }
 556
 557 static struct fd *sock_get_fd( struct object *obj )
 558 {
 559     struct sock *sock = (struct sock *)obj;
 560     return (struct fd *)grab_object( sock->fd );
 561 }
 562
 563 static void sock_destroy( struct object *obj )
 564 {
 565     struct sock *sock = (struct sock *)obj;
 566     assert( obj->ops == &sock_ops );
 567
 568     /* FIXME: special socket shutdown stuff? */
 569
 570     if ( sock->deferred )
 571         release_object( sock->deferred );
 572
 573     free_async_queue( sock->read_q );
 574     free_async_queue( sock->write_q );
 575     if (sock->event) release_object( sock->event );
 576     if (sock->fd)
 577     {
 578         /* shut the socket down to force pending poll() calls in the client to return */
 579         shutdown( get_unix_fd(sock->fd), SHUT_RDWR );
 580         release_object( sock->fd );
 581     }
 582 }
 583
 584 /* create a new and unconnected socket */
 585 static struct object *create_socket( int family, int type, int protocol, unsigned int flags )
 586 {
 587     struct sock *sock;
 588     int sockfd;
 589
 590     sockfd = socket( family, type, protocol );
 591     if (debug_level)
 592         fprintf(stderr,"socket(%d,%d,%d)=%d\n",family,type,protocol,sockfd);
 593     if (sockfd == -1)
 594     {
 595         sock_set_error();
 596         return NULL;
 597     }
 598     fcntl(sockfd, F_SETFL, O_NONBLOCK); /* make socket nonblocking */
 599     if (!(sock = alloc_object( &sock_ops )))
 600     {
 601         close( sockfd );
 602         return NULL;
 603     }
 604     sock->state = (type != SOCK_STREAM) ? (FD_READ|FD_WRITE) : 0;
 605     sock->mask    = 0;
 606     sock->hmask   = 0;
 607     sock->pmask   = 0;
 608     sock->polling = 0;
 609     sock->flags   = flags;
 610     sock->type    = type;
 611     sock->family  = family;
 612     sock->event   = NULL;
 613     sock->window  = 0;
 614     sock->message = 0;
 615     sock->wparam  = 0;
 616     sock->deferred = NULL;
 617     sock->read_q  = NULL;
 618     sock->write_q = NULL;
 619     if (!(sock->fd = create_anonymous_fd( &sock_fd_ops, sockfd, &sock->obj,
 620                             (flags & WSA_FLAG_OVERLAPPED) ? 0 : FILE_SYNCHRONOUS_IO_NONALERT )))
 621     {
 622         release_object( sock );
 623         return NULL;
 624     }
 625     sock_reselect( sock );
 626     clear_error();
 627     return &sock->obj;
 628 }
 629
 630 /* accept a socket (creates a new fd) */
 631 static struct sock *accept_socket( obj_handle_t handle )
 632 {
 633     struct sock *acceptsock;
 634     struct sock *sock;
 635     int acceptfd;
 636     struct sockaddr     saddr;
 637
 638     sock = (struct sock *)get_handle_obj( current->process, handle, FILE_READ_DATA, &sock_ops );
 639     if (!sock)
 640         return NULL;
 641
 642     if ( sock->deferred )
 643     {
 644         acceptsock = sock->deferred;
 645         sock->deferred = NULL;
 646     }
 647     else
 648     {
 649
 650         /* Try to accept(2). We can't be safe that this an already connected socket
 651          * or that accept() is allowed on it. In those cases we will get -1/errno
 652          * return.
 653          */
 654         unsigned int slen = sizeof(saddr);
 655         acceptfd = accept( get_unix_fd(sock->fd), &saddr, &slen);
 656         if (acceptfd==-1)
 657         {
 658             sock_set_error();
 659             release_object( sock );
 660             return NULL;
 661         }
 662         if (!(acceptsock = alloc_object( &sock_ops )))
 663         {
 664             close( acceptfd );
 665             release_object( sock );
 666             return NULL;
 667         }
 668
 669         /* newly created socket gets the same properties of the listening socket */
 670         fcntl(acceptfd, F_SETFL, O_NONBLOCK); /* make socket nonblocking */
 671         acceptsock->state  = FD_WINE_CONNECTED|FD_READ|FD_WRITE;
 672         if (sock->state & FD_WINE_NONBLOCKING)
 673             acceptsock->state |= FD_WINE_NONBLOCKING;
 674         acceptsock->mask    = sock->mask;
 675         acceptsock->hmask   = 0;
 676         acceptsock->pmask   = 0;
 677         acceptsock->polling = 0;
 678         acceptsock->type    = sock->type;
 679         acceptsock->family  = sock->family;
 680         acceptsock->event   = NULL;
 681         acceptsock->window  = sock->window;
 682         acceptsock->message = sock->message;
 683         acceptsock->wparam  = 0;
 684         if (sock->event) acceptsock->event = (struct event *)grab_object( sock->event );
 685         acceptsock->flags = sock->flags;
 686         acceptsock->deferred = NULL;
 687         acceptsock->read_q  = NULL;
 688         acceptsock->write_q = NULL;
 689         if (!(acceptsock->fd = create_anonymous_fd( &sock_fd_ops, acceptfd, &acceptsock->obj,
 690                                                     get_fd_options( sock->fd ) )))
 691         {
 692             release_object( acceptsock );
 693             release_object( sock );
 694             return NULL;
 695         }
 696     }
 697     clear_error();
 698     sock->pmask &= ~FD_ACCEPT;
 699     sock->hmask &= ~FD_ACCEPT;
 700     sock_reselect( sock );
 701     release_object( sock );
 702     return acceptsock;
 703 }
 704
 705 /* set the last error depending on errno */
 706 static int sock_get_error( int err )
 707 {
 708     switch (err)
 709     {
 710         case EINTR:             return WSAEINTR;
 711         case EBADF:             return WSAEBADF;
 712         case EPERM:
 713         case EACCES:            return WSAEACCES;
 714         case EFAULT:            return WSAEFAULT;
 715         case EINVAL:            return WSAEINVAL;
 716         case EMFILE:            return WSAEMFILE;
 717         case EWOULDBLOCK:       return WSAEWOULDBLOCK;
 718         case EINPROGRESS:       return WSAEINPROGRESS;
 719         case EALREADY:          return WSAEALREADY;
 720         case ENOTSOCK:          return WSAENOTSOCK;
 721         case EDESTADDRREQ:      return WSAEDESTADDRREQ;
 722         case EMSGSIZE:          return WSAEMSGSIZE;
 723         case EPROTOTYPE:        return WSAEPROTOTYPE;
 724         case ENOPROTOOPT:       return WSAENOPROTOOPT;
 725         case EPROTONOSUPPORT:   return WSAEPROTONOSUPPORT;
 726         case ESOCKTNOSUPPORT:   return WSAESOCKTNOSUPPORT;
 727         case EOPNOTSUPP:        return WSAEOPNOTSUPP;
 728         case EPFNOSUPPORT:      return WSAEPFNOSUPPORT;
 729         case EAFNOSUPPORT:      return WSAEAFNOSUPPORT;
 730         case EADDRINUSE:        return WSAEADDRINUSE;
 731         case EADDRNOTAVAIL:     return WSAEADDRNOTAVAIL;
 732         case ENETDOWN:          return WSAENETDOWN;
 733         case ENETUNREACH:       return WSAENETUNREACH;
 734         case ENETRESET:         return WSAENETRESET;
 735         case ECONNABORTED:      return WSAECONNABORTED;
 736         case EPIPE:
 737         case ECONNRESET:        return WSAECONNRESET;
 738         case ENOBUFS:           return WSAENOBUFS;
 739         case EISCONN:           return WSAEISCONN;
 740         case ENOTCONN:          return WSAENOTCONN;
 741         case ESHUTDOWN:         return WSAESHUTDOWN;
 742         case ETOOMANYREFS:      return WSAETOOMANYREFS;
 743         case ETIMEDOUT:         return WSAETIMEDOUT;
 744         case ECONNREFUSED:      return WSAECONNREFUSED;
 745         case ELOOP:             return WSAELOOP;
 746         case ENAMETOOLONG:      return WSAENAMETOOLONG;
 747         case EHOSTDOWN:         return WSAEHOSTDOWN;
 748         case EHOSTUNREACH:      return WSAEHOSTUNREACH;
 749         case ENOTEMPTY:         return WSAENOTEMPTY;
 750 #ifdef EPROCLIM
 751         case EPROCLIM:          return WSAEPROCLIM;
 752 #endif
 753 #ifdef EUSERS
 754         case EUSERS:            return WSAEUSERS;
 755 #endif
 756 #ifdef EDQUOT
 757         case EDQUOT:            return WSAEDQUOT;
 758 #endif
 759 #ifdef ESTALE
 760         case ESTALE:            return WSAESTALE;
 761 #endif
 762 #ifdef EREMOTE
 763         case EREMOTE:           return WSAEREMOTE;
 764 #endif
 765     default: errno=err; perror("sock_set_error"); return WSAEFAULT;
 766     }
 767 }
 768
 769 /* set the last error depending on errno */
 770 static void sock_set_error(void)
 771 {
 772     set_error( sock_get_error( errno ) );
 773 }
 774
 775 /* create a socket */
 776 DECL_HANDLER(create_socket)
 777 {
 778     struct object *obj;
 779
 780     reply->handle = 0;
 781     if ((obj = create_socket( req->family, req->type, req->protocol, req->flags )) != NULL)
 782     {
 783         reply->handle = alloc_handle( current->process, obj, req->access, req->attributes );
 784         release_object( obj );
 785     }
 786 }
 787
 788 /* accept a socket */
 789 DECL_HANDLER(accept_socket)
 790 {
 791     struct sock *sock;
 792
 793     reply->handle = 0;
 794     if ((sock = accept_socket( req->lhandle )) != NULL)
 795     {
 796         reply->handle = alloc_handle( current->process, &sock->obj, req->access, req->attributes );
 797         sock->wparam = reply->handle;  /* wparam for message is the socket handle */
 798         sock_reselect( sock );
 799         release_object( &sock->obj );
 800     }
 801 }
 802
 803 /* set socket event parameters */
 804 DECL_HANDLER(set_socket_event)
 805 {
 806     struct sock *sock;
 807     struct event *old_event;
 808     int pollev;
 809
 810     if (!(sock = (struct sock *)get_handle_obj( current->process, req->handle,
 811                                                 FILE_WRITE_ATTRIBUTES, &sock_ops))) return;
 812     old_event = sock->event;
 813     sock->mask    = req->mask;
 814     sock->hmask   &= ~req->mask; /* re-enable held events */
 815     sock->event   = NULL;
 816     sock->window  = req->window;
 817     sock->message = req->msg;
 818     sock->wparam  = req->handle;  /* wparam is the socket handle */
 819     if (req->event) sock->event = get_event_obj( current->process, req->event, EVENT_MODIFY_STATE );
 820
 821     if (debug_level && sock->event) fprintf(stderr, "event ptr: %p\n", sock->event);
 822
 823     pollev = sock_reselect( sock );
 824     if ( pollev ) sock_try_event( sock, pollev );
 825
 826     if (sock->mask)
 827         sock->state |= FD_WINE_NONBLOCKING;
 828
 829     /* if a network event is pending, signal the event object
 830        it is possible that FD_CONNECT or FD_ACCEPT network events has happened
 831        before a WSAEventSelect() was done on it.
 832        (when dealing with Asynchronous socket)  */
 833     if (sock->pmask & sock->mask) sock_wake_up( sock, pollev );
 834
 835     if (old_event) release_object( old_event ); /* we're through with it */
 836     release_object( &sock->obj );
 837 }
 838
 839 /* get socket event parameters */
 840 DECL_HANDLER(get_socket_event)
 841 {
 842     struct sock *sock;
 843
 844     sock = (struct sock *)get_handle_obj( current->process, req->handle, FILE_READ_ATTRIBUTES, &sock_ops );
 845     if (!sock)
 846     {
 847         reply->mask  = 0;
 848         reply->pmask = 0;
 849         reply->state = 0;
 850         set_error( WSAENOTSOCK );
 851         return;
 852     }
 853     reply->mask  = sock->mask;
 854     reply->pmask = sock->pmask;
 855     reply->state = sock->state;
 856     set_reply_data( sock->errors, min( get_reply_max_size(), sizeof(sock->errors) ));
 857
 858     if (req->service)
 859     {
 860         if (req->c_event)
 861         {
 862             struct event *cevent = get_event_obj( current->process, req->c_event,
 863                                                   EVENT_MODIFY_STATE );
 864             if (cevent)
 865             {
 866                 reset_event( cevent );
 867                 release_object( cevent );
 868             }
 869         }
 870         sock->pmask = 0;
 871         sock_reselect( sock );
 872     }
 873     release_object( &sock->obj );
 874 }
 875
 876 /* re-enable pending socket events */
 877 DECL_HANDLER(enable_socket_event)
 878 {
 879     struct sock *sock;
 880     int pollev;
 881
 882     if (!(sock = (struct sock*)get_handle_obj( current->process, req->handle,
 883                                                FILE_WRITE_ATTRIBUTES, &sock_ops)))
 884         return;
 885
 886     sock->pmask &= ~req->mask; /* is this safe? */
 887     sock->hmask &= ~req->mask;
 888     if ( req->mask & FD_READ )
 889         sock->hmask &= ~FD_CLOSE;
 890     sock->state |= req->sstate;
 891     sock->state &= ~req->cstate;
 892     if ( sock->type != SOCK_STREAM ) sock->state &= ~STREAM_FLAG_MASK;
 893
 894     pollev = sock_reselect( sock );
 895     if ( pollev ) sock_try_event( sock, pollev );
 896
 897     release_object( &sock->obj );
 898 }
 899
 900 DECL_HANDLER(set_socket_deferred)
 901 {
 902     struct sock *sock, *acceptsock;
 903
 904     sock=(struct sock *)get_handle_obj( current->process, req->handle, FILE_WRITE_ATTRIBUTES, &sock_ops );
 905     if ( !sock )
 906     {
 907         set_error( WSAENOTSOCK );
 908         return;
 909     }
 910     acceptsock = (struct sock *)get_handle_obj( current->process, req->deferred, 0, &sock_ops );
 911     if ( !acceptsock )
 912     {
 913         release_object( sock );
 914         set_error( WSAENOTSOCK );
 915         return;
 916     }
 917     sock->deferred = acceptsock;
 918     release_object( sock );
 919 }