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