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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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 <stdio.h>
  29 #include <string.h>
  30 #include <stdlib.h>
  31 #include <errno.h>
  32 #ifdef HAVE_SYS_ERRNO_H
  33 # include <sys/errno.h>
  34 #endif
  35 #include <sys/time.h>
  36 #include <sys/types.h>
  37 #ifdef HAVE_SYS_SOCKET_H
  38 # include <sys/socket.h>
  39 #endif
  40 #ifdef HAVE_SYS_IOCTL_H
  41 #include <sys/ioctl.h>
  42 #endif
  43 #ifdef HAVE_SYS_FILIO_H
  44 # include <sys/filio.h>
  45 #endif
  46 #include <time.h>
  47 #include <unistd.h>
  48
  49 #include "winbase.h"
  50
  51 #include "process.h"
  52 #include "file.h"
  53 #include "handle.h"
  54 #include "thread.h"
  55 #include "request.h"
  56 #include "user.h"
  57 #include "async.h"
  58
  59 /* To avoid conflicts with the Unix socket headers. Plus we only need a few
  60  * macros anyway.
  61  */
  62 #define USE_WS_PREFIX
  63 #include "winsock2.h"
  64
  65 struct sock
  66 {
  67     struct object       obj;         /* object header */
  68     struct fd          *fd;          /* socket file descriptor */
  69     unsigned int        state;       /* status bits */
  70     unsigned int        mask;        /* event mask */
  71     unsigned int        hmask;       /* held (blocked) events */
  72     unsigned int        pmask;       /* pending events */
  73     unsigned int        flags;       /* socket flags */
  74     int                 polling;     /* is socket being polled? */
  75     unsigned short      type;        /* socket type */
  76     unsigned short      family;      /* socket family */
  77     struct event       *event;       /* event object */
  78     user_handle_t       window;      /* window to send the message to */
  79     unsigned int        message;     /* message to send */
  80     obj_handle_t        wparam;      /* message wparam (socket handle) */
  81     int                 errors[FD_MAX_EVENTS]; /* event errors */
  82     struct sock*        deferred;    /* socket that waits for a deferred accept */
  83     struct async_queue  read_q;      /* Queue for asynchronous reads */
  84     struct async_queue  write_q;     /* Queue for asynchronous writes */
  85 };
  86
  87 static void sock_dump( struct object *obj, int verbose );
  88 static int sock_signaled( struct object *obj, struct thread *thread );
  89 static struct fd *sock_get_fd( struct object *obj );
  90 static void sock_destroy( struct object *obj );
  91
  92 static int sock_get_poll_events( struct fd *fd );
  93 static void sock_poll_event( struct fd *fd, int event );
  94 static int sock_get_info( struct fd *fd, struct get_file_info_reply *reply, int *flags );
  95 static void sock_queue_async( struct fd *fd, void *ptr, unsigned int status, int type, int count );
  96
  97 static int sock_get_error( int err );
  98 static void sock_set_error(void);
  99
 100 static const struct object_ops sock_ops =
 101 {
 102     sizeof(struct sock),          /* size */
 103     sock_dump,                    /* dump */
 104     add_queue,                    /* add_queue */
 105     remove_queue,                 /* remove_queue */
 106     sock_signaled,                /* signaled */
 107     no_satisfied,                 /* satisfied */
 108     sock_get_fd,                  /* get_fd */
 109     sock_destroy                  /* destroy */
 110 };
 111
 112 static const struct fd_ops sock_fd_ops =
 113 {
 114     sock_get_poll_events,         /* get_poll_events */
 115     sock_poll_event,              /* poll_event */
 116     no_flush,                     /* flush */
 117     sock_get_info,                /* get_file_info */
 118     sock_queue_async              /* queue_async */
 119 };
 120
 121
 122 /* Permutation of 0..FD_MAX_EVENTS - 1 representing the order in which
 123  * we post messages if there are multiple events.  Used to send
 124  * messages.  The problem is if there is both a FD_CONNECT event and,
 125  * say, an FD_READ event available on the same socket, we want to
 126  * notify the app of the connect event first.  Otherwise it may
 127  * discard the read event because it thinks it hasn't connected yet.
 128  */
 129 static const int event_bitorder[FD_MAX_EVENTS] =
 130 {
 131     FD_CONNECT_BIT,
 132     FD_ACCEPT_BIT,
 133     FD_OOB_BIT,
 134     FD_WRITE_BIT,
 135     FD_READ_BIT,
 136     FD_CLOSE_BIT,
 137     6, 7, 8, 9  /* leftovers */
 138 };
 139
 140 /* Flags that make sense only for SOCK_STREAM sockets */
 141 #define STREAM_FLAG_MASK ((unsigned int) (FD_CONNECT | FD_ACCEPT | FD_WINE_LISTENING | FD_WINE_CONNECTED))
 142
 143 typedef enum {
 144     SOCK_SHUTDOWN_ERROR = -1,
 145     SOCK_SHUTDOWN_EOF = 0,
 146     SOCK_SHUTDOWN_POLLHUP = 1
 147 } sock_shutdown_t;
 148
 149 static sock_shutdown_t sock_shutdown_type = SOCK_SHUTDOWN_ERROR;
 150
 151 static sock_shutdown_t sock_check_pollhup (void)
 152 {
 153     sock_shutdown_t ret = SOCK_SHUTDOWN_ERROR;
 154     int fd[2], n;
 155     struct pollfd pfd;
 156     char dummy;
 157
 158     if ( socketpair ( AF_UNIX, SOCK_STREAM, 0, fd ) ) goto out;
 159     if ( shutdown ( fd[0], 1 ) ) goto out;
 160
 161     pfd.fd = fd[1];
 162     pfd.events = POLLIN;
 163     pfd.revents = 0;
 164
 165     n = poll ( &pfd, 1, 0 );
 166     if ( n != 1 ) goto out; /* error or timeout */
 167     if ( pfd.revents & POLLHUP )
 168         ret = SOCK_SHUTDOWN_POLLHUP;
 169     else if ( pfd.revents & POLLIN &&
 170               read ( fd[1], &dummy, 1 ) == 0 )
 171         ret = SOCK_SHUTDOWN_EOF;
 172
 173 out:
 174     close ( fd[0] );
 175     close ( fd[1] );
 176     return ret;
 177 }
 178
 179 void sock_init(void)
 180 {
 181     sock_shutdown_type = sock_check_pollhup ();
 182
 183     switch ( sock_shutdown_type )
 184     {
 185     case SOCK_SHUTDOWN_EOF:
 186         if (debug_level) fprintf ( stderr, "sock_init: shutdown() causes EOF\n" );
 187         break;
 188     case SOCK_SHUTDOWN_POLLHUP:
 189         if (debug_level) fprintf ( stderr, "sock_init: shutdown() causes POLLHUP\n" );
 190         break;
 191     default:
 192         fprintf ( stderr, "sock_init: ERROR in sock_check_pollhup()\n" );
 193         sock_shutdown_type = SOCK_SHUTDOWN_EOF;
 194     }
 195 }
 196
 197 static int sock_reselect( struct sock *sock )
 198 {
 199     int ev = sock_get_poll_events( sock->fd );
 200
 201     if (debug_level)
 202         fprintf(stderr,"sock_reselect(%p): new mask %x\n", sock, ev);
 203
 204     if (!sock->polling)  /* FIXME: should find a better way to do this */
 205     {
 206         /* previously unconnected socket, is this reselect supposed to connect it? */
 207         if (!(sock->state & ~FD_WINE_NONBLOCKING)) return 0;
 208         /* ok, it is, attach it to the wineserver's main poll loop */
 209         sock->polling = 1;
 210     }
 211     /* update condition mask */
 212     set_fd_events( sock->fd, ev );
 213     return ev;
 214 }
 215
 216 /* After POLLHUP is received, the socket will no longer be in the main select loop.
 217    This function is used to signal pending events nevertheless */
 218 static void sock_try_event ( struct sock *sock, int event )
 219 {
 220     event = check_fd_events( sock->fd, event );
 221     if (event)
 222     {
 223         if ( debug_level ) fprintf ( stderr, "sock_try_event: %x\n", event );
 224         sock_poll_event ( sock->fd, event );
 225     }
 226 }
 227
 228 /* wake anybody waiting on the socket event or send the associated message */
 229 static void sock_wake_up( struct sock *sock, int pollev )
 230 {
 231     unsigned int events = sock->pmask & sock->mask;
 232     int i;
 233     int async_active = 0;
 234
 235     if ( sock->flags & FD_FLAG_OVERLAPPED )
 236     {
 237         if( pollev & (POLLIN|POLLPRI) && IS_READY( sock->read_q ) )
 238         {
 239             if (debug_level) fprintf ( stderr, "activating read queue for socket %p\n", sock );
 240             async_notify( sock->read_q.head, STATUS_ALERTED );
 241             async_active = 1;
 242         }
 243         if( pollev & POLLOUT && IS_READY( sock->write_q ) )
 244         {
 245             if (debug_level) fprintf ( stderr, "activating write queue for socket %p\n", sock );
 246             async_notify( sock->write_q.head, STATUS_ALERTED );
 247             async_active = 1;
 248         }
 249     }
 250
 251     /* Do not signal events if there are still pending asynchronous IO requests */
 252     /* We need this to delay FD_CLOSE events until all pending overlapped requests are processed */
 253     if ( !events || async_active ) return;
 254
 255     if (sock->event)
 256     {
 257         if (debug_level) fprintf(stderr, "signalling events %x ptr %p\n", events, sock->event );
 258         set_event( sock->event );
 259     }
 260     if (sock->window)
 261     {
 262         if (debug_level) fprintf(stderr, "signalling events %x win %p\n", events, sock->window );
 263         for (i = 0; i < FD_MAX_EVENTS; i++)
 264         {
 265             int event = event_bitorder[i];
 266             if (sock->pmask & (1 << event))
 267             {
 268                 unsigned int lparam = (1 << event) | (sock->errors[event] << 16);
 269                 post_message( sock->window, sock->message, (unsigned int)sock->wparam, lparam );
 270             }
 271         }
 272         sock->pmask = 0;
 273         sock_reselect( sock );
 274     }
 275 }
 276
 277 inline static int sock_error( struct fd *fd )
 278 {
 279     unsigned int optval = 0, optlen;
 280
 281     optlen = sizeof(optval);
 282     getsockopt( get_unix_fd(fd), SOL_SOCKET, SO_ERROR, (void *) &optval, &optlen);
 283     return optval ? sock_get_error(optval) : 0;
 284 }
 285
 286 static void sock_poll_event( struct fd *fd, int event )
 287 {
 288     struct sock *sock = get_fd_user( fd );
 289     int hangup_seen = 0;
 290
 291     assert( sock->obj.ops == &sock_ops );
 292     if (debug_level)
 293         fprintf(stderr, "socket %p select event: %x\n", sock, event);
 294     if (sock->state & FD_CONNECT)
 295     {
 296         /* connecting */
 297         if (event & POLLOUT)
 298         {
 299             /* we got connected */
 300             sock->state |= FD_WINE_CONNECTED|FD_READ|FD_WRITE;
 301             sock->state &= ~FD_CONNECT;
 302             sock->pmask |= FD_CONNECT;
 303             sock->errors[FD_CONNECT_BIT] = 0;
 304             if (debug_level)
 305                 fprintf(stderr, "socket %p connection success\n", sock);
 306         }
 307         else if (event & (POLLERR|POLLHUP))
 308         {
 309             /* we didn't get connected? */
 310             sock->state &= ~FD_CONNECT;
 311             sock->pmask |= FD_CONNECT;
 312             sock->errors[FD_CONNECT_BIT] = sock_error( fd );
 313             if (debug_level)
 314                 fprintf(stderr, "socket %p connection failure\n", sock);
 315         }
 316     } else
 317     if (sock->state & FD_WINE_LISTENING)
 318     {
 319         /* listening */
 320         if (event & POLLIN)
 321         {
 322             /* incoming connection */
 323             sock->pmask |= FD_ACCEPT;
 324             sock->errors[FD_ACCEPT_BIT] = 0;
 325             sock->hmask |= FD_ACCEPT;
 326         }
 327         else if (event & (POLLERR|POLLHUP))
 328         {
 329             /* failed incoming connection? */
 330             sock->pmask |= FD_ACCEPT;
 331             sock->errors[FD_ACCEPT_BIT] = sock_error( fd );
 332             sock->hmask |= FD_ACCEPT;
 333         }
 334     } else
 335     {
 336         /* normal data flow */
 337         if ( sock->type == SOCK_STREAM && ( event & POLLIN ) )
 338         {
 339             char dummy;
 340             int nr;
 341
 342             /* Linux 2.4 doesn't report POLLHUP if only one side of the socket
 343              * has been closed, so we need to check for it explicitly here */
 344             nr  = recv( get_unix_fd( fd ), &dummy, 1, MSG_PEEK );
 345             if ( nr > 0 )
 346             {
 347                 /* incoming data */
 348                 sock->pmask |= FD_READ;
 349                 sock->hmask |= (FD_READ|FD_CLOSE);
 350                 sock->errors[FD_READ_BIT] = 0;
 351                 if (debug_level)
 352                     fprintf(stderr, "socket %p is readable\n", sock );
 353             }
 354             else if ( nr == 0 )
 355                 hangup_seen = 1;
 356             else
 357             {
 358                 /* EAGAIN can happen if an async recv() falls between the server's poll()
 359                    call and the invocation of this routine */
 360                 if ( errno == EAGAIN )
 361                     event &= ~POLLIN;
 362                 else
 363                 {
 364                     if ( debug_level )
 365                         fprintf ( stderr, "recv error on socket %p: %d\n", sock, errno );
 366                     event = POLLERR;
 367                 }
 368             }
 369
 370         }
 371         else if ( sock_shutdown_type == SOCK_SHUTDOWN_POLLHUP && (event & POLLHUP) )
 372         {
 373             hangup_seen = 1;
 374         }
 375         else if ( event & POLLIN ) /* POLLIN for non-stream socket */
 376         {
 377             sock->pmask |= FD_READ;
 378             sock->hmask |= (FD_READ|FD_CLOSE);
 379             sock->errors[FD_READ_BIT] = 0;
 380             if (debug_level)
 381                 fprintf(stderr, "socket %p is readable\n", sock );
 382
 383         }
 384
 385         if (event & POLLOUT)
 386         {
 387             sock->pmask |= FD_WRITE;
 388             sock->hmask |= FD_WRITE;
 389             sock->errors[FD_WRITE_BIT] = 0;
 390             if (debug_level)
 391                 fprintf(stderr, "socket %p is writable\n", sock);
 392         }
 393         if (event & POLLPRI)
 394         {
 395             sock->pmask |= FD_OOB;
 396             sock->hmask |= FD_OOB;
 397             sock->errors[FD_OOB_BIT] = 0;
 398             if (debug_level)
 399                 fprintf(stderr, "socket %p got OOB data\n", sock);
 400         }
 401         /* According to WS2 specs, FD_CLOSE is only delivered when there is
 402            no more data to be read (i.e. hangup_seen = 1) */
 403         else if ( hangup_seen && (sock->state & (FD_READ|FD_WRITE) ))
 404         {
 405             sock->errors[FD_CLOSE_BIT] = sock_error( fd );
 406             if ( (event & POLLERR) || ( sock_shutdown_type == SOCK_SHUTDOWN_EOF && (event & POLLHUP) ))
 407                 sock->state &= ~FD_WRITE;
 408             sock->pmask |= FD_CLOSE;
 409             sock->hmask |= FD_CLOSE;
 410             if (debug_level)
 411                 fprintf(stderr, "socket %p aborted by error %d, event: %x - removing from select loop\n",
 412                         sock, sock->errors[FD_CLOSE_BIT], event);
 413         }
 414     }
 415
 416     if ( sock->pmask & FD_CLOSE || event & (POLLERR|POLLHUP) )
 417     {
 418         if ( debug_level )
 419             fprintf ( stderr, "removing socket %p from select loop\n", sock );
 420         set_fd_events( sock->fd, -1 );
 421     }
 422     else
 423         sock_reselect( sock );
 424
 425     /* wake up anyone waiting for whatever just happened */
 426     if ( sock->pmask & sock->mask || sock->flags & FD_FLAG_OVERLAPPED ) sock_wake_up( sock, event );
 427
 428     /* if anyone is stupid enough to wait on the socket object itself,
 429      * maybe we should wake them up too, just in case? */
 430     wake_up( &sock->obj, 0 );
 431 }
 432
 433 static void sock_dump( struct object *obj, int verbose )
 434 {
 435     struct sock *sock = (struct sock *)obj;
 436     assert( obj->ops == &sock_ops );
 437     printf( "Socket fd=%p, state=%x, mask=%x, pending=%x, held=%x\n",
 438             sock->fd, sock->state,
 439             sock->mask, sock->pmask, sock->hmask );
 440 }
 441
 442 static int sock_signaled( struct object *obj, struct thread *thread )
 443 {
 444     struct sock *sock = (struct sock *)obj;
 445     assert( obj->ops == &sock_ops );
 446
 447     return check_fd_events( sock->fd, sock_get_poll_events( sock->fd ) ) != 0;
 448 }
 449
 450 static int sock_get_poll_events( struct fd *fd )
 451 {
 452     struct sock *sock = get_fd_user( fd );
 453     unsigned int mask = sock->mask & sock->state & ~sock->hmask;
 454     int ev = 0;
 455
 456     assert( sock->obj.ops == &sock_ops );
 457
 458     if (sock->state & FD_CONNECT)
 459         /* connecting, wait for writable */
 460         return POLLOUT;
 461     if (sock->state & FD_WINE_LISTENING)
 462         /* listening, wait for readable */
 463         return (sock->hmask & FD_ACCEPT) ? 0 : POLLIN;
 464
 465     if (mask & (FD_READ) || (sock->flags & WSA_FLAG_OVERLAPPED && IS_READY (sock->read_q)))
 466         ev |= POLLIN | POLLPRI;
 467     if (mask & FD_WRITE || (sock->flags & WSA_FLAG_OVERLAPPED && IS_READY (sock->write_q)))
 468         ev |= POLLOUT;
 469     /* We use POLLIN with 0 bytes recv() as FD_CLOSE indication for stream sockets. */
 470     if ( sock->type == SOCK_STREAM && ( sock->mask & ~sock->hmask & FD_CLOSE) )
 471         ev |= POLLIN;
 472
 473     return ev;
 474 }
 475
 476 static int sock_get_info( struct fd *fd, struct get_file_info_reply *reply, int *flags )
 477 {
 478     struct sock *sock = get_fd_user( fd );
 479     assert ( sock->obj.ops == &sock_ops );
 480
 481     if (reply)
 482     {
 483         reply->type        = FILE_TYPE_PIPE;
 484         reply->attr        = 0;
 485         reply->access_time = 0;
 486         reply->write_time  = 0;
 487         reply->size_high   = 0;
 488         reply->size_low    = 0;
 489         reply->links       = 0;
 490         reply->index_high  = 0;
 491         reply->index_low   = 0;
 492         reply->serial      = 0;
 493     }
 494     *flags = 0;
 495     if (sock->flags & WSA_FLAG_OVERLAPPED) *flags |= FD_FLAG_OVERLAPPED;
 496     if ( sock->type != SOCK_STREAM || sock->state & FD_WINE_CONNECTED )
 497     {
 498         if ( !(sock->state & FD_READ  ) ) *flags |= FD_FLAG_RECV_SHUTDOWN;
 499         if ( !(sock->state & FD_WRITE ) ) *flags |= FD_FLAG_SEND_SHUTDOWN;
 500     }
 501     return FD_TYPE_SOCKET;
 502 }
 503
 504 static void sock_queue_async(struct fd *fd, void *ptr, unsigned int status, int type, int count)
 505 {
 506     struct sock *sock = get_fd_user( fd );
 507     struct async_queue *q;
 508     struct async *async;
 509     int pollev;
 510
 511     assert( sock->obj.ops == &sock_ops );
 512
 513     if ( !(sock->flags & WSA_FLAG_OVERLAPPED) )
 514     {
 515         set_error ( STATUS_INVALID_HANDLE );
 516         return;
 517     }
 518
 519     switch( type )
 520     {
 521     case ASYNC_TYPE_READ:
 522         q = &sock->read_q;
 523         sock->hmask &= ~FD_CLOSE;
 524         break;
 525     case ASYNC_TYPE_WRITE:
 526         q = &sock->write_q;
 527         break;
 528     default:
 529         set_error( STATUS_INVALID_PARAMETER );
 530         return;
 531     }
 532
 533     async = find_async ( q, current, ptr );
 534
 535     if ( status == STATUS_PENDING )
 536     {
 537         if ( ( !( sock->state & FD_READ ) && type == ASYNC_TYPE_READ  ) ||
 538              ( !( sock->state & FD_WRITE ) && type == ASYNC_TYPE_WRITE ) )
 539         {
 540             set_error ( STATUS_PIPE_DISCONNECTED );
 541             if ( async ) destroy_async ( async );
 542         }
 543         else
 544         {
 545             if ( !async )
 546                 async = create_async ( &sock->obj, current, ptr );
 547             if ( !async )
 548                 return;
 549
 550             async->status = STATUS_PENDING;
 551             if ( !async->q )
 552                 async_insert ( q, async );
 553         }
 554     }
 555     else if ( async ) destroy_async ( async );
 556     else set_error ( STATUS_INVALID_PARAMETER );
 557
 558     pollev = sock_reselect ( sock );
 559     if ( pollev ) sock_try_event ( sock, pollev );
 560 }
 561
 562 static struct fd *sock_get_fd( struct object *obj )
 563 {
 564     struct sock *sock = (struct sock *)obj;
 565     return (struct fd *)grab_object( sock->fd );
 566 }
 567
 568 static void sock_destroy( struct object *obj )
 569 {
 570     struct sock *sock = (struct sock *)obj;
 571     assert( obj->ops == &sock_ops );
 572
 573     /* FIXME: special socket shutdown stuff? */
 574
 575     if ( sock->deferred )
 576         release_object ( sock->deferred );
 577
 578     if ( sock->flags & WSA_FLAG_OVERLAPPED )
 579     {
 580         destroy_async_queue ( &sock->read_q );
 581         destroy_async_queue ( &sock->write_q );
 582     }
 583     if (sock->event) release_object( sock->event );
 584     if (sock->fd) release_object( sock->fd );
 585 }
 586
 587 /* create a new and unconnected socket */
 588 static struct object *create_socket( int family, int type, int protocol, unsigned int flags )
 589 {
 590     struct sock *sock;
 591     int sockfd;
 592
 593     sockfd = socket( family, type, protocol );
 594     if (debug_level)
 595         fprintf(stderr,"socket(%d,%d,%d)=%d\n",family,type,protocol,sockfd);
 596     if (sockfd == -1) {
 597         sock_set_error();
 598         return NULL;
 599     }
 600     fcntl(sockfd, F_SETFL, O_NONBLOCK); /* make socket nonblocking */
 601     if (!(sock = alloc_object( &sock_ops )))
 602     {
 603         close( sockfd );
 604         return NULL;
 605     }
 606     sock->state = (type != SOCK_STREAM) ? (FD_READ|FD_WRITE) : 0;
 607     sock->mask    = 0;
 608     sock->hmask   = 0;
 609     sock->pmask   = 0;
 610     sock->polling = 0;
 611     sock->flags   = flags;
 612     sock->type    = type;
 613     sock->family  = family;
 614     sock->event   = NULL;
 615     sock->window  = 0;
 616     sock->message = 0;
 617     sock->wparam  = 0;
 618     sock->deferred = NULL;
 619     if (!(sock->fd = create_anonymous_fd( &sock_fd_ops, sockfd, &sock->obj )))
 620     {
 621         release_object( sock );
 622         return NULL;
 623     }
 624     if (sock->flags & WSA_FLAG_OVERLAPPED)
 625     {
 626         init_async_queue (&sock->read_q);
 627         init_async_queue (&sock->write_q);
 628     }
 629     sock_reselect( sock );
 630     clear_error();
 631     return &sock->obj;
 632 }
 633
 634 /* accept a socket (creates a new fd) */
 635 static struct sock *accept_socket( obj_handle_t handle )
 636 {
 637     struct sock *acceptsock;
 638     struct sock *sock;
 639     int acceptfd;
 640     struct sockaddr     saddr;
 641     int                 slen;
 642
 643     sock=(struct sock*)get_handle_obj(current->process,handle,
 644                                       GENERIC_READ|GENERIC_WRITE|SYNCHRONIZE,&sock_ops);
 645     if (!sock)
 646         return NULL;
 647
 648     if ( sock->deferred ) {
 649         acceptsock = sock->deferred;
 650         sock->deferred = NULL;
 651     } else {
 652
 653         /* Try to accept(2). We can't be safe that this an already connected socket
 654          * or that accept() is allowed on it. In those cases we will get -1/errno
 655          * return.
 656          */
 657         slen = sizeof(saddr);
 658         acceptfd = accept( get_unix_fd(sock->fd), &saddr, &slen);
 659         if (acceptfd==-1) {
 660             sock_set_error();
 661             release_object( sock );
 662             return NULL;
 663         }
 664         if (!(acceptsock = alloc_object( &sock_ops )))
 665         {
 666             close( acceptfd );
 667             release_object( sock );
 668             return NULL;
 669         }
 670
 671         /* newly created socket gets the same properties of the listening socket */
 672         fcntl(acceptfd, F_SETFL, O_NONBLOCK); /* make socket nonblocking */
 673         acceptsock->state  = FD_WINE_CONNECTED|FD_READ|FD_WRITE;
 674         if (sock->state & FD_WINE_NONBLOCKING)
 675             acceptsock->state |= FD_WINE_NONBLOCKING;
 676         acceptsock->mask    = sock->mask;
 677         acceptsock->hmask   = 0;
 678         acceptsock->pmask   = 0;
 679         acceptsock->polling = 0;
 680         acceptsock->type    = sock->type;
 681         acceptsock->family  = sock->family;
 682         acceptsock->event   = NULL;
 683         acceptsock->window  = sock->window;
 684         acceptsock->message = sock->message;
 685         acceptsock->wparam  = 0;
 686         if (sock->event) acceptsock->event = (struct event *)grab_object( sock->event );
 687         acceptsock->flags = sock->flags;
 688         acceptsock->deferred = 0;
 689         if (!(acceptsock->fd = create_anonymous_fd( &sock_fd_ops, acceptfd, &acceptsock->obj )))
 690         {
 691             release_object( acceptsock );
 692             release_object( sock );
 693             return NULL;
 694         }
 695         if ( acceptsock->flags & WSA_FLAG_OVERLAPPED )
 696         {
 697             init_async_queue ( &acceptsock->read_q );
 698             init_async_queue ( &acceptsock->write_q );
 699         }
 700     }
 701     clear_error();
 702     sock->pmask &= ~FD_ACCEPT;
 703     sock->hmask &= ~FD_ACCEPT;
 704     sock_reselect( sock );
 705     release_object( sock );
 706     return acceptsock;
 707 }
 708
 709 /* set the last error depending on errno */
 710 static int sock_get_error( int err )
 711 {
 712     switch (err)
 713     {
 714         case EINTR:             return WSAEINTR; break;
 715         case EBADF:             return WSAEBADF; break;
 716         case EPERM:
 717         case EACCES:            return WSAEACCES; break;
 718         case EFAULT:            return WSAEFAULT; break;
 719         case EINVAL:            return WSAEINVAL; break;
 720         case EMFILE:            return WSAEMFILE; break;
 721         case EWOULDBLOCK:       return WSAEWOULDBLOCK; break;
 722         case EINPROGRESS:       return WSAEINPROGRESS; break;
 723         case EALREADY:          return WSAEALREADY; break;
 724         case ENOTSOCK:          return WSAENOTSOCK; break;
 725         case EDESTADDRREQ:      return WSAEDESTADDRREQ; break;
 726         case EMSGSIZE:          return WSAEMSGSIZE; break;
 727         case EPROTOTYPE:        return WSAEPROTOTYPE; break;
 728         case ENOPROTOOPT:       return WSAENOPROTOOPT; break;
 729         case EPROTONOSUPPORT:   return WSAEPROTONOSUPPORT; break;
 730         case ESOCKTNOSUPPORT:   return WSAESOCKTNOSUPPORT; break;
 731         case EOPNOTSUPP:        return WSAEOPNOTSUPP; break;
 732         case EPFNOSUPPORT:      return WSAEPFNOSUPPORT; break;
 733         case EAFNOSUPPORT:      return WSAEAFNOSUPPORT; break;
 734         case EADDRINUSE:        return WSAEADDRINUSE; break;
 735         case EADDRNOTAVAIL:     return WSAEADDRNOTAVAIL; break;
 736         case ENETDOWN:          return WSAENETDOWN; break;
 737         case ENETUNREACH:       return WSAENETUNREACH; break;
 738         case ENETRESET:         return WSAENETRESET; break;
 739         case ECONNABORTED:      return WSAECONNABORTED; break;
 740         case EPIPE:
 741         case ECONNRESET:        return WSAECONNRESET; break;
 742         case ENOBUFS:           return WSAENOBUFS; break;
 743         case EISCONN:           return WSAEISCONN; break;
 744         case ENOTCONN:          return WSAENOTCONN; break;
 745         case ESHUTDOWN:         return WSAESHUTDOWN; break;
 746         case ETOOMANYREFS:      return WSAETOOMANYREFS; break;
 747         case ETIMEDOUT:         return WSAETIMEDOUT; break;
 748         case ECONNREFUSED:      return WSAECONNREFUSED; break;
 749         case ELOOP:             return WSAELOOP; break;
 750         case ENAMETOOLONG:      return WSAENAMETOOLONG; break;
 751         case EHOSTDOWN:         return WSAEHOSTDOWN; break;
 752         case EHOSTUNREACH:      return WSAEHOSTUNREACH; break;
 753         case ENOTEMPTY:         return WSAENOTEMPTY; break;
 754 #ifdef EPROCLIM
 755         case EPROCLIM:          return WSAEPROCLIM; break;
 756 #endif
 757 #ifdef EUSERS
 758         case EUSERS:            return WSAEUSERS; break;
 759 #endif
 760 #ifdef EDQUOT
 761         case EDQUOT:            return WSAEDQUOT; break;
 762 #endif
 763 #ifdef ESTALE
 764         case ESTALE:            return WSAESTALE; break;
 765 #endif
 766 #ifdef EREMOTE
 767         case EREMOTE:           return WSAEREMOTE; break;
 768 #endif
 769     default: errno=err; perror("sock_set_error"); return ERROR_UNKNOWN; break;
 770     }
 771 }
 772
 773 /* set the last error depending on errno */
 774 static void sock_set_error(void)
 775 {
 776     set_error( sock_get_error( errno ) );
 777 }
 778
 779 /* create a socket */
 780 DECL_HANDLER(create_socket)
 781 {
 782     struct object *obj;
 783
 784     reply->handle = 0;
 785     if ((obj = create_socket( req->family, req->type, req->protocol, req->flags )) != NULL)
 786     {
 787         reply->handle = alloc_handle( current->process, obj, req->access, req->inherit );
 788         release_object( obj );
 789     }
 790 }
 791
 792 /* accept a socket */
 793 DECL_HANDLER(accept_socket)
 794 {
 795     struct sock *sock;
 796
 797     reply->handle = 0;
 798     if ((sock = accept_socket( req->lhandle )) != NULL)
 799     {
 800         reply->handle = alloc_handle( current->process, &sock->obj, req->access, req->inherit );
 801         sock->wparam = reply->handle;  /* wparam for message is the socket handle */
 802         sock_reselect( sock );
 803         release_object( &sock->obj );
 804     }
 805 }
 806
 807 /* set socket event parameters */
 808 DECL_HANDLER(set_socket_event)
 809 {
 810     struct sock *sock;
 811     struct event *old_event;
 812     int pollev;
 813
 814     if (!(sock = (struct sock*)get_handle_obj( current->process, req->handle,
 815                                                GENERIC_READ|GENERIC_WRITE|SYNCHRONIZE, &sock_ops)))
 816         return;
 817     old_event = sock->event;
 818     sock->mask    = req->mask;
 819     sock->event   = NULL;
 820     sock->window  = req->window;
 821     sock->message = req->msg;
 822     sock->wparam  = req->handle;  /* wparam is the socket handle */
 823     if (req->event) sock->event = get_event_obj( current->process, req->event, EVENT_MODIFY_STATE );
 824
 825     if (debug_level && sock->event) fprintf(stderr, "event ptr: %p\n", sock->event);
 826
 827     pollev = sock_reselect( sock );
 828     if ( pollev ) sock_try_event ( sock, pollev );
 829
 830     if (sock->mask)
 831         sock->state |= FD_WINE_NONBLOCKING;
 832
 833     /* if a network event is pending, signal the event object
 834        it is possible that FD_CONNECT or FD_ACCEPT network events has happened
 835        before a WSAEventSelect() was done on it.
 836        (when dealing with Asynchronous socket)  */
 837     if (sock->pmask & sock->mask) sock_wake_up( sock, pollev );
 838
 839     if (old_event) release_object( old_event ); /* we're through with it */
 840     release_object( &sock->obj );
 841 }
 842
 843 /* get socket event parameters */
 844 DECL_HANDLER(get_socket_event)
 845 {
 846     struct sock *sock;
 847
 848     sock=(struct sock*)get_handle_obj(current->process,req->handle,GENERIC_READ|GENERIC_WRITE|SYNCHRONIZE,&sock_ops);
 849     if (!sock)
 850     {
 851         reply->mask  = 0;
 852         reply->pmask = 0;
 853         reply->state = 0;
 854         set_error( WSAENOTSOCK );
 855         return;
 856     }
 857     reply->mask  = sock->mask;
 858     reply->pmask = sock->pmask;
 859     reply->state = sock->state;
 860     set_reply_data( sock->errors, min( get_reply_max_size(), sizeof(sock->errors) ));
 861
 862     if (req->service)
 863     {
 864         if (req->c_event)
 865         {
 866             struct event *cevent = get_event_obj( current->process, req->c_event,
 867                                                   EVENT_MODIFY_STATE );
 868             if (cevent)
 869             {
 870                 reset_event( cevent );
 871                 release_object( cevent );
 872             }
 873         }
 874         sock->pmask = 0;
 875         sock_reselect( sock );
 876     }
 877     release_object( &sock->obj );
 878 }
 879
 880 /* re-enable pending socket events */
 881 DECL_HANDLER(enable_socket_event)
 882 {
 883     struct sock *sock;
 884     int pollev;
 885
 886     if (!(sock = (struct sock*)get_handle_obj( current->process, req->handle,
 887                                                GENERIC_READ|GENERIC_WRITE|SYNCHRONIZE, &sock_ops)))
 888         return;
 889
 890     sock->pmask &= ~req->mask; /* is this safe? */
 891     sock->hmask &= ~req->mask;
 892     if ( req->mask & FD_READ )
 893         sock->hmask &= ~FD_CLOSE;
 894     sock->state |= req->sstate;
 895     sock->state &= ~req->cstate;
 896     if ( sock->type != SOCK_STREAM ) sock->state &= ~STREAM_FLAG_MASK;
 897
 898     pollev = sock_reselect( sock );
 899     if ( pollev ) sock_try_event ( sock, pollev );
 900
 901     release_object( &sock->obj );
 902 }
 903
 904 DECL_HANDLER(set_socket_deferred)
 905 {
 906     struct sock *sock, *acceptsock;
 907
 908     sock=(struct sock*)get_handle_obj( current->process,req->handle,
 909                                        GENERIC_READ|GENERIC_WRITE|SYNCHRONIZE,&sock_ops );
 910     if ( !sock )
 911     {
 912         set_error ( WSAENOTSOCK );
 913         return;
 914     }
 915     acceptsock = (struct sock*)get_handle_obj( current->process,req->deferred,
 916                                                GENERIC_READ|GENERIC_WRITE|SYNCHRONIZE,&sock_ops );
 917     if ( !acceptsock )
 918     {
 919         release_object ( sock );
 920         set_error ( WSAENOTSOCK );
 921         return;
 922     }
 923     sock->deferred = acceptsock;
 924     release_object ( sock );
 925 }