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