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 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 unsigned int sock_map_access( struct object *obj, unsigned int access );
  94 static void sock_destroy( struct object *obj );
  95
  96 static int sock_get_poll_events( struct fd *fd );
  97 static void sock_poll_event( struct fd *fd, int event );
  98 static enum server_fd_type sock_get_info( struct fd *fd, int *flags );
  99 static void sock_queue_async( struct fd *fd, void *apc, void *user, void *iosb, int type, int count );
 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     sock_map_access,              /* map_access */
 116     no_lookup_name,               /* lookup_name */
 117     fd_close_handle,              /* close_handle */
 118     sock_destroy                  /* destroy */
 119 };
 120
 121 static const struct fd_ops sock_fd_ops =
 122 {
 123     sock_get_poll_events,         /* get_poll_events */
 124     sock_poll_event,              /* poll_event */
 125     no_flush,                     /* flush */
 126     sock_get_info,                /* get_file_info */
 127     sock_queue_async,             /* queue_async */
 128     sock_cancel_async             /* cancel_async */
 129 };
 130
 131
 132 /* Permutation of 0..FD_MAX_EVENTS - 1 representing the order in which
 133  * we post messages if there are multiple events.  Used to send
 134  * messages.  The problem is if there is both a FD_CONNECT event and,
 135  * say, an FD_READ event available on the same socket, we want to
 136  * notify the app of the connect event first.  Otherwise it may
 137  * discard the read event because it thinks it hasn't connected yet.
 138  */
 139 static const int event_bitorder[FD_MAX_EVENTS] =
 140 {
 141     FD_CONNECT_BIT,
 142     FD_ACCEPT_BIT,
 143     FD_OOB_BIT,
 144     FD_WRITE_BIT,
 145     FD_READ_BIT,
 146     FD_CLOSE_BIT,
 147     6, 7, 8, 9  /* leftovers */
 148 };
 149
 150 /* Flags that make sense only for SOCK_STREAM sockets */
 151 #define STREAM_FLAG_MASK ((unsigned int) (FD_CONNECT | FD_ACCEPT | FD_WINE_LISTENING | FD_WINE_CONNECTED))
 152
 153 typedef enum {
 154     SOCK_SHUTDOWN_ERROR = -1,
 155     SOCK_SHUTDOWN_EOF = 0,
 156     SOCK_SHUTDOWN_POLLHUP = 1
 157 } sock_shutdown_t;
 158
 159 static sock_shutdown_t sock_shutdown_type = SOCK_SHUTDOWN_ERROR;
 160
 161 static sock_shutdown_t sock_check_pollhup(void)
 162 {
 163     sock_shutdown_t ret = SOCK_SHUTDOWN_ERROR;
 164     int fd[2], n;
 165     struct pollfd pfd;
 166     char dummy;
 167
 168     if ( socketpair( AF_UNIX, SOCK_STREAM, 0, fd ) ) goto out;
 169     if ( shutdown( fd[0], 1 ) ) goto out;
 170
 171     pfd.fd = fd[1];
 172     pfd.events = POLLIN;
 173     pfd.revents = 0;
 174
 175     n = poll( &pfd, 1, 0 );
 176     if ( n != 1 ) goto out; /* error or timeout */
 177     if ( pfd.revents & POLLHUP )
 178         ret = SOCK_SHUTDOWN_POLLHUP;
 179     else if ( pfd.revents & POLLIN &&
 180               read( fd[1], &dummy, 1 ) == 0 )
 181         ret = SOCK_SHUTDOWN_EOF;
 182
 183 out:
 184     close( fd[0] );
 185     close( fd[1] );
 186     return ret;
 187 }
 188
 189 void sock_init(void)
 190 {
 191     sock_shutdown_type = sock_check_pollhup();
 192
 193     switch ( sock_shutdown_type )
 194     {
 195     case SOCK_SHUTDOWN_EOF:
 196         if (debug_level) fprintf( stderr, "sock_init: shutdown() causes EOF\n" );
 197         break;
 198     case SOCK_SHUTDOWN_POLLHUP:
 199         if (debug_level) fprintf( stderr, "sock_init: shutdown() causes POLLHUP\n" );
 200         break;
 201     default:
 202         fprintf( stderr, "sock_init: ERROR in sock_check_pollhup()\n" );
 203         sock_shutdown_type = SOCK_SHUTDOWN_EOF;
 204     }
 205 }
 206
 207 static int sock_reselect( struct sock *sock )
 208 {
 209     int ev = sock_get_poll_events( sock->fd );
 210
 211     if (debug_level)
 212         fprintf(stderr,"sock_reselect(%p): new mask %x\n", sock, ev);
 213
 214     if (!sock->polling)  /* FIXME: should find a better way to do this */
 215     {
 216         /* previously unconnected socket, is this reselect supposed to connect it? */
 217         if (!(sock->state & ~FD_WINE_NONBLOCKING)) return 0;
 218         /* ok, it is, attach it to the wineserver's main poll loop */
 219         sock->polling = 1;
 220     }
 221     /* update condition mask */
 222     set_fd_events( sock->fd, ev );
 223     return ev;
 224 }
 225
 226 /* After POLLHUP is received, the socket will no longer be in the main select loop.
 227    This function is used to signal pending events nevertheless */
 228 static void sock_try_event( struct sock *sock, int event )
 229 {
 230     event = check_fd_events( sock->fd, event );
 231     if (event)
 232     {
 233         if ( debug_level ) fprintf( stderr, "sock_try_event: %x\n", event );
 234         sock_poll_event( sock->fd, event );
 235     }
 236 }
 237
 238 /* wake anybody waiting on the socket event or send the associated message */
 239 static void sock_wake_up( struct sock *sock, int pollev )
 240 {
 241     unsigned int events = sock->pmask & sock->mask;
 242     int i;
 243     int async_active = 0;
 244
 245     if ( sock->flags & WSA_FLAG_OVERLAPPED )
 246     {
 247         if ( pollev & (POLLIN|POLLPRI) && !list_empty( &sock->read_q ))
 248         {
 249             if (debug_level) fprintf( stderr, "activating read queue for socket %p\n", sock );
 250             async_terminate_head( &sock->read_q, STATUS_ALERTED );
 251             async_active = 1;
 252         }
 253         if ( pollev & POLLOUT && !list_empty( &sock->write_q ))
 254         {
 255             if (debug_level) fprintf( stderr, "activating write queue for socket %p\n", sock );
 256             async_terminate_head( &sock->write_q, STATUS_ALERTED );
 257             async_active = 1;
 258         }
 259     }
 260
 261     /* Do not signal events if there are still pending asynchronous IO requests */
 262     /* We need this to delay FD_CLOSE events until all pending overlapped requests are processed */
 263     if ( !events || async_active ) return;
 264
 265     if (sock->event)
 266     {
 267         if (debug_level) fprintf(stderr, "signalling events %x ptr %p\n", events, sock->event );
 268         set_event( sock->event );
 269     }
 270     if (sock->window)
 271     {
 272         if (debug_level) fprintf(stderr, "signalling events %x win %p\n", events, sock->window );
 273         for (i = 0; i < FD_MAX_EVENTS; i++)
 274         {
 275             int event = event_bitorder[i];
 276             if (sock->pmask & (1 << event))
 277             {
 278                 unsigned int lparam = (1 << event) | (sock->errors[event] << 16);
 279                 post_message( sock->window, sock->message, (unsigned long)sock->wparam, lparam );
 280             }
 281         }
 282         sock->pmask = 0;
 283         sock_reselect( sock );
 284     }
 285 }
 286
 287 inline static int sock_error( struct fd *fd )
 288 {
 289     unsigned int optval = 0, optlen;
 290
 291     optlen = sizeof(optval);
 292     getsockopt( get_unix_fd(fd), SOL_SOCKET, SO_ERROR, (void *) &optval, &optlen);
 293     return optval ? sock_get_error(optval) : 0;
 294 }
 295
 296 static void sock_poll_event( struct fd *fd, int event )
 297 {
 298     struct sock *sock = get_fd_user( fd );
 299     int hangup_seen = 0;
 300
 301     assert( sock->obj.ops == &sock_ops );
 302     if (debug_level)
 303         fprintf(stderr, "socket %p select event: %x\n", sock, event);
 304     if (sock->state & FD_CONNECT)
 305     {
 306         /* connecting */
 307         if (event & POLLOUT)
 308         {
 309             /* we got connected */
 310             sock->state |= FD_WINE_CONNECTED|FD_READ|FD_WRITE;
 311             sock->state &= ~FD_CONNECT;
 312             sock->pmask |= FD_CONNECT;
 313             sock->errors[FD_CONNECT_BIT] = 0;
 314             if (debug_level)
 315                 fprintf(stderr, "socket %p connection success\n", sock);
 316         }
 317         else if (event & (POLLERR|POLLHUP))
 318         {
 319             /* we didn't get connected? */
 320             sock->state &= ~FD_CONNECT;
 321             sock->pmask |= FD_CONNECT;
 322             sock->errors[FD_CONNECT_BIT] = sock_error( fd );
 323             if (debug_level)
 324                 fprintf(stderr, "socket %p connection failure\n", sock);
 325         }
 326     }
 327     else if (sock->state & FD_WINE_LISTENING)
 328     {
 329         /* listening */
 330         if (event & POLLIN)
 331         {
 332             /* incoming connection */
 333             sock->pmask |= FD_ACCEPT;
 334             sock->errors[FD_ACCEPT_BIT] = 0;
 335             sock->hmask |= FD_ACCEPT;
 336         }
 337         else if (event & (POLLERR|POLLHUP))
 338         {
 339             /* failed incoming connection? */
 340             sock->pmask |= FD_ACCEPT;
 341             sock->errors[FD_ACCEPT_BIT] = sock_error( fd );
 342             sock->hmask |= FD_ACCEPT;
 343         }
 344     }
 345     else
 346     {
 347         /* normal data flow */
 348         if ( sock->type == SOCK_STREAM && ( event & POLLIN ) )
 349         {
 350             char dummy;
 351             int nr;
 352
 353             /* Linux 2.4 doesn't report POLLHUP if only one side of the socket
 354              * has been closed, so we need to check for it explicitly here */
 355             nr  = recv( get_unix_fd( fd ), &dummy, 1, MSG_PEEK );
 356             if ( nr > 0 )
 357             {
 358                 /* incoming data */
 359                 sock->pmask |= FD_READ;
 360                 sock->hmask |= (FD_READ|FD_CLOSE);
 361                 sock->errors[FD_READ_BIT] = 0;
 362                 if (debug_level)
 363                     fprintf(stderr, "socket %p is readable\n", sock );
 364             }
 365             else if ( nr == 0 )
 366                 hangup_seen = 1;
 367             else
 368             {
 369                 /* EAGAIN can happen if an async recv() falls between the server's poll()
 370                    call and the invocation of this routine */
 371                 if ( errno == EAGAIN )
 372                     event &= ~POLLIN;
 373                 else
 374                 {
 375                     if ( debug_level )
 376                         fprintf( stderr, "recv error on socket %p: %d\n", sock, errno );
 377                     event = POLLERR;
 378                 }
 379             }
 380
 381         }
 382         else if ( sock_shutdown_type == SOCK_SHUTDOWN_POLLHUP && (event & POLLHUP) )
 383         {
 384             hangup_seen = 1;
 385         }
 386         else if ( event & POLLIN ) /* POLLIN for non-stream socket */
 387         {
 388             sock->pmask |= FD_READ;
 389             sock->hmask |= (FD_READ|FD_CLOSE);
 390             sock->errors[FD_READ_BIT] = 0;
 391             if (debug_level)
 392                 fprintf(stderr, "socket %p is readable\n", sock );
 393
 394         }
 395
 396         if (event & POLLOUT)
 397         {
 398             sock->pmask |= FD_WRITE;
 399             sock->hmask |= FD_WRITE;
 400             sock->errors[FD_WRITE_BIT] = 0;
 401             if (debug_level)
 402                 fprintf(stderr, "socket %p is writable\n", sock);
 403         }
 404         if (event & POLLPRI)
 405         {
 406             sock->pmask |= FD_OOB;
 407             sock->hmask |= FD_OOB;
 408             sock->errors[FD_OOB_BIT] = 0;
 409             if (debug_level)
 410                 fprintf(stderr, "socket %p got OOB data\n", sock);
 411         }
 412         /* According to WS2 specs, FD_CLOSE is only delivered when there is
 413            no more data to be read (i.e. hangup_seen = 1) */
 414         else if ( hangup_seen && (sock->state & (FD_READ|FD_WRITE) ))
 415         {
 416             sock->errors[FD_CLOSE_BIT] = sock_error( fd );
 417             if ( (event & POLLERR) || ( sock_shutdown_type == SOCK_SHUTDOWN_EOF && (event & POLLHUP) ))
 418                 sock->state &= ~FD_WRITE;
 419             sock->pmask |= FD_CLOSE;
 420             sock->hmask |= FD_CLOSE;
 421             if (debug_level)
 422                 fprintf(stderr, "socket %p aborted by error %d, event: %x - removing from select loop\n",
 423                         sock, sock->errors[FD_CLOSE_BIT], event);
 424         }
 425     }
 426
 427     if ( sock->pmask & FD_CLOSE || event & (POLLERR|POLLHUP) )
 428     {
 429         if ( debug_level )
 430             fprintf( stderr, "removing socket %p from select loop\n", sock );
 431         set_fd_events( sock->fd, -1 );
 432     }
 433     else
 434         sock_reselect( sock );
 435
 436     /* wake up anyone waiting for whatever just happened */
 437     if ( sock->pmask & sock->mask || sock->flags & WSA_FLAG_OVERLAPPED ) sock_wake_up( sock, event );
 438
 439     /* if anyone is stupid enough to wait on the socket object itself,
 440      * maybe we should wake them up too, just in case? */
 441     wake_up( &sock->obj, 0 );
 442 }
 443
 444 static void sock_dump( struct object *obj, int verbose )
 445 {
 446     struct sock *sock = (struct sock *)obj;
 447     assert( obj->ops == &sock_ops );
 448     printf( "Socket fd=%p, state=%x, mask=%x, pending=%x, held=%x\n",
 449             sock->fd, sock->state,
 450             sock->mask, sock->pmask, sock->hmask );
 451 }
 452
 453 static int sock_signaled( struct object *obj, struct thread *thread )
 454 {
 455     struct sock *sock = (struct sock *)obj;
 456     assert( obj->ops == &sock_ops );
 457
 458     return check_fd_events( sock->fd, sock_get_poll_events( sock->fd ) ) != 0;
 459 }
 460
 461 static unsigned int sock_map_access( struct object *obj, unsigned int access )
 462 {
 463     if (access & GENERIC_READ)    access |= FILE_GENERIC_READ;
 464     if (access & GENERIC_WRITE)   access |= FILE_GENERIC_WRITE;
 465     if (access & GENERIC_EXECUTE) access |= FILE_GENERIC_EXECUTE;
 466     if (access & GENERIC_ALL)     access |= FILE_ALL_ACCESS;
 467     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 468 }
 469
 470 static int sock_get_poll_events( struct fd *fd )
 471 {
 472     struct sock *sock = get_fd_user( fd );
 473     unsigned int mask = sock->mask & sock->state & ~sock->hmask;
 474     int ev = 0;
 475
 476     assert( sock->obj.ops == &sock_ops );
 477
 478     if (sock->state & FD_CONNECT)
 479         /* connecting, wait for writable */
 480         return POLLOUT;
 481     if (sock->state & FD_WINE_LISTENING)
 482         /* listening, wait for readable */
 483         return (sock->hmask & FD_ACCEPT) ? 0 : POLLIN;
 484
 485     if (mask & (FD_READ) || (sock->flags & WSA_FLAG_OVERLAPPED && !list_empty( &sock->read_q )))
 486         ev |= POLLIN | POLLPRI;
 487     if (mask & FD_WRITE || (sock->flags & WSA_FLAG_OVERLAPPED && !list_empty( &sock->write_q )))
 488         ev |= POLLOUT;
 489     /* We use POLLIN with 0 bytes recv() as FD_CLOSE indication for stream sockets. */
 490     if ( sock->type == SOCK_STREAM && ( sock->mask & ~sock->hmask & FD_CLOSE) )
 491         ev |= POLLIN;
 492
 493     return ev;
 494 }
 495
 496 static enum server_fd_type sock_get_info( struct fd *fd, int *flags )
 497 {
 498     struct sock *sock = get_fd_user( fd );
 499     assert( sock->obj.ops == &sock_ops );
 500
 501     *flags = FD_FLAG_AVAILABLE;
 502     if (sock->flags & WSA_FLAG_OVERLAPPED) *flags |= FD_FLAG_OVERLAPPED;
 503     if ( sock->type != SOCK_STREAM || sock->state & FD_WINE_CONNECTED )
 504     {
 505         if ( !(sock->state & FD_READ  ) ) *flags |= FD_FLAG_RECV_SHUTDOWN;
 506         if ( !(sock->state & FD_WRITE ) ) *flags |= FD_FLAG_SEND_SHUTDOWN;
 507     }
 508     return FD_TYPE_SOCKET;
 509 }
 510
 511 static void sock_queue_async( struct fd *fd, void *apc, void *user, void *iosb,
 512                               int type, int count )
 513 {
 514     struct sock *sock = get_fd_user( fd );
 515     struct list *queue;
 516     int pollev;
 517
 518     assert( sock->obj.ops == &sock_ops );
 519
 520     if ( !(sock->flags & WSA_FLAG_OVERLAPPED) )
 521     {
 522         set_error( STATUS_INVALID_HANDLE );
 523         return;
 524     }
 525
 526     switch (type)
 527     {
 528     case ASYNC_TYPE_READ:
 529         queue = &sock->read_q;
 530         sock->hmask &= ~FD_CLOSE;
 531         break;
 532     case ASYNC_TYPE_WRITE:
 533         queue = &sock->write_q;
 534         break;
 535     default:
 536         set_error( STATUS_INVALID_PARAMETER );
 537         return;
 538     }
 539
 540     if ( ( !( sock->state & FD_READ ) && type == ASYNC_TYPE_READ  ) ||
 541          ( !( sock->state & FD_WRITE ) && type == ASYNC_TYPE_WRITE ) )
 542     {
 543         set_error( STATUS_PIPE_DISCONNECTED );
 544     }
 545     else
 546     {
 547         if (!create_async( current, NULL, queue, apc, user, iosb ))
 548             return;
 549     }
 550
 551     pollev = sock_reselect( sock );
 552     if ( pollev ) sock_try_event( sock, pollev );
 553 }
 554
 555 static void sock_cancel_async( struct fd *fd )
 556 {
 557     struct sock *sock = get_fd_user( fd );
 558     assert( sock->obj.ops == &sock_ops );
 559
 560     async_terminate_queue( &sock->read_q, STATUS_CANCELLED );
 561     async_terminate_queue( &sock->write_q, STATUS_CANCELLED );
 562 }
 563
 564 static struct fd *sock_get_fd( struct object *obj )
 565 {
 566     struct sock *sock = (struct sock *)obj;
 567     return (struct fd *)grab_object( sock->fd );
 568 }
 569
 570 static void sock_destroy( struct object *obj )
 571 {
 572     struct sock *sock = (struct sock *)obj;
 573     assert( obj->ops == &sock_ops );
 574
 575     /* FIXME: special socket shutdown stuff? */
 576
 577     if ( sock->deferred )
 578         release_object( sock->deferred );
 579
 580     if ( sock->flags & WSA_FLAG_OVERLAPPED )
 581     {
 582         async_terminate_queue( &sock->read_q, STATUS_CANCELLED );
 583         async_terminate_queue( &sock->write_q, STATUS_CANCELLED );
 584     }
 585     if (sock->event) release_object( sock->event );
 586     if (sock->fd)
 587     {
 588         /* shut the socket down to force pending poll() calls in the client to return */
 589         shutdown( get_unix_fd(sock->fd), SHUT_RDWR );
 590         release_object( sock->fd );
 591     }
 592 }
 593
 594 /* create a new and unconnected socket */
 595 static struct object *create_socket( int family, int type, int protocol, unsigned int flags )
 596 {
 597     struct sock *sock;
 598     int sockfd;
 599
 600     sockfd = socket( family, type, protocol );
 601     if (debug_level)
 602         fprintf(stderr,"socket(%d,%d,%d)=%d\n",family,type,protocol,sockfd);
 603     if (sockfd == -1)
 604     {
 605         sock_set_error();
 606         return NULL;
 607     }
 608     fcntl(sockfd, F_SETFL, O_NONBLOCK); /* make socket nonblocking */
 609     if (!(sock = alloc_object( &sock_ops )))
 610     {
 611         close( sockfd );
 612         return NULL;
 613     }
 614     sock->state = (type != SOCK_STREAM) ? (FD_READ|FD_WRITE) : 0;
 615     sock->mask    = 0;
 616     sock->hmask   = 0;
 617     sock->pmask   = 0;
 618     sock->polling = 0;
 619     sock->flags   = flags;
 620     sock->type    = type;
 621     sock->family  = family;
 622     sock->event   = NULL;
 623     sock->window  = 0;
 624     sock->message = 0;
 625     sock->wparam  = 0;
 626     sock->deferred = NULL;
 627     if (!(sock->fd = create_anonymous_fd( &sock_fd_ops, sockfd, &sock->obj )))
 628     {
 629         release_object( sock );
 630         return NULL;
 631     }
 632     list_init( &sock->read_q );
 633     list_init( &sock->write_q );
 634     sock_reselect( sock );
 635     clear_error();
 636     return &sock->obj;
 637 }
 638
 639 /* accept a socket (creates a new fd) */
 640 static struct sock *accept_socket( obj_handle_t handle )
 641 {
 642     struct sock *acceptsock;
 643     struct sock *sock;
 644     int acceptfd;
 645     struct sockaddr     saddr;
 646
 647     sock = (struct sock *)get_handle_obj( current->process, handle, FILE_READ_DATA, &sock_ops );
 648     if (!sock)
 649         return NULL;
 650
 651     if ( sock->deferred )
 652     {
 653         acceptsock = sock->deferred;
 654         sock->deferred = NULL;
 655     }
 656     else
 657     {
 658
 659         /* Try to accept(2). We can't be safe that this an already connected socket
 660          * or that accept() is allowed on it. In those cases we will get -1/errno
 661          * return.
 662          */
 663         unsigned int slen = sizeof(saddr);
 664         acceptfd = accept( get_unix_fd(sock->fd), &saddr, &slen);
 665         if (acceptfd==-1)
 666         {
 667             sock_set_error();
 668             release_object( sock );
 669             return NULL;
 670         }
 671         if (!(acceptsock = alloc_object( &sock_ops )))
 672         {
 673             close( acceptfd );
 674             release_object( sock );
 675             return NULL;
 676         }
 677
 678         /* newly created socket gets the same properties of the listening socket */
 679         fcntl(acceptfd, F_SETFL, O_NONBLOCK); /* make socket nonblocking */
 680         acceptsock->state  = FD_WINE_CONNECTED|FD_READ|FD_WRITE;
 681         if (sock->state & FD_WINE_NONBLOCKING)
 682             acceptsock->state |= FD_WINE_NONBLOCKING;
 683         acceptsock->mask    = sock->mask;
 684         acceptsock->hmask   = 0;
 685         acceptsock->pmask   = 0;
 686         acceptsock->polling = 0;
 687         acceptsock->type    = sock->type;
 688         acceptsock->family  = sock->family;
 689         acceptsock->event   = NULL;
 690         acceptsock->window  = sock->window;
 691         acceptsock->message = sock->message;
 692         acceptsock->wparam  = 0;
 693         if (sock->event) acceptsock->event = (struct event *)grab_object( sock->event );
 694         acceptsock->flags = sock->flags;
 695         acceptsock->deferred = NULL;
 696         if (!(acceptsock->fd = create_anonymous_fd( &sock_fd_ops, acceptfd, &acceptsock->obj )))
 697         {
 698             release_object( acceptsock );
 699             release_object( sock );
 700             return NULL;
 701         }
 702         list_init( &acceptsock->read_q );
 703         list_init( &acceptsock->write_q );
 704     }
 705     clear_error();
 706     sock->pmask &= ~FD_ACCEPT;
 707     sock->hmask &= ~FD_ACCEPT;
 708     sock_reselect( sock );
 709     release_object( sock );
 710     return acceptsock;
 711 }
 712
 713 /* set the last error depending on errno */
 714 static int sock_get_error( int err )
 715 {
 716     switch (err)
 717     {
 718         case EINTR:             return WSAEINTR;
 719         case EBADF:             return WSAEBADF;
 720         case EPERM:
 721         case EACCES:            return WSAEACCES;
 722         case EFAULT:            return WSAEFAULT;
 723         case EINVAL:            return WSAEINVAL;
 724         case EMFILE:            return WSAEMFILE;
 725         case EWOULDBLOCK:       return WSAEWOULDBLOCK;
 726         case EINPROGRESS:       return WSAEINPROGRESS;
 727         case EALREADY:          return WSAEALREADY;
 728         case ENOTSOCK:          return WSAENOTSOCK;
 729         case EDESTADDRREQ:      return WSAEDESTADDRREQ;
 730         case EMSGSIZE:          return WSAEMSGSIZE;
 731         case EPROTOTYPE:        return WSAEPROTOTYPE;
 732         case ENOPROTOOPT:       return WSAENOPROTOOPT;
 733         case EPROTONOSUPPORT:   return WSAEPROTONOSUPPORT;
 734         case ESOCKTNOSUPPORT:   return WSAESOCKTNOSUPPORT;
 735         case EOPNOTSUPP:        return WSAEOPNOTSUPP;
 736         case EPFNOSUPPORT:      return WSAEPFNOSUPPORT;
 737         case EAFNOSUPPORT:      return WSAEAFNOSUPPORT;
 738         case EADDRINUSE:        return WSAEADDRINUSE;
 739         case EADDRNOTAVAIL:     return WSAEADDRNOTAVAIL;
 740         case ENETDOWN:          return WSAENETDOWN;
 741         case ENETUNREACH:       return WSAENETUNREACH;
 742         case ENETRESET:         return WSAENETRESET;
 743         case ECONNABORTED:      return WSAECONNABORTED;
 744         case EPIPE:
 745         case ECONNRESET:        return WSAECONNRESET;
 746         case ENOBUFS:           return WSAENOBUFS;
 747         case EISCONN:           return WSAEISCONN;
 748         case ENOTCONN:          return WSAENOTCONN;
 749         case ESHUTDOWN:         return WSAESHUTDOWN;
 750         case ETOOMANYREFS:      return WSAETOOMANYREFS;
 751         case ETIMEDOUT:         return WSAETIMEDOUT;
 752         case ECONNREFUSED:      return WSAECONNREFUSED;
 753         case ELOOP:             return WSAELOOP;
 754         case ENAMETOOLONG:      return WSAENAMETOOLONG;
 755         case EHOSTDOWN:         return WSAEHOSTDOWN;
 756         case EHOSTUNREACH:      return WSAEHOSTUNREACH;
 757         case ENOTEMPTY:         return WSAENOTEMPTY;
 758 #ifdef EPROCLIM
 759         case EPROCLIM:          return WSAEPROCLIM;
 760 #endif
 761 #ifdef EUSERS
 762         case EUSERS:            return WSAEUSERS;
 763 #endif
 764 #ifdef EDQUOT
 765         case EDQUOT:            return WSAEDQUOT;
 766 #endif
 767 #ifdef ESTALE
 768         case ESTALE:            return WSAESTALE;
 769 #endif
 770 #ifdef EREMOTE
 771         case EREMOTE:           return WSAEREMOTE;
 772 #endif
 773     default: errno=err; perror("sock_set_error"); return WSAEFAULT;
 774     }
 775 }
 776
 777 /* set the last error depending on errno */
 778 static void sock_set_error(void)
 779 {
 780     set_error( sock_get_error( errno ) );
 781 }
 782
 783 /* create a socket */
 784 DECL_HANDLER(create_socket)
 785 {
 786     struct object *obj;
 787
 788     reply->handle = 0;
 789     if ((obj = create_socket( req->family, req->type, req->protocol, req->flags )) != NULL)
 790     {
 791         reply->handle = alloc_handle( current->process, obj, req->access, req->attributes );
 792         release_object( obj );
 793     }
 794 }
 795
 796 /* accept a socket */
 797 DECL_HANDLER(accept_socket)
 798 {
 799     struct sock *sock;
 800
 801     reply->handle = 0;
 802     if ((sock = accept_socket( req->lhandle )) != NULL)
 803     {
 804         reply->handle = alloc_handle( current->process, &sock->obj, req->access, req->attributes );
 805         sock->wparam = reply->handle;  /* wparam for message is the socket handle */
 806         sock_reselect( sock );
 807         release_object( &sock->obj );
 808     }
 809 }
 810
 811 /* set socket event parameters */
 812 DECL_HANDLER(set_socket_event)
 813 {
 814     struct sock *sock;
 815     struct event *old_event;
 816     int pollev;
 817
 818     if (!(sock = (struct sock *)get_handle_obj( current->process, req->handle,
 819                                                 FILE_WRITE_ATTRIBUTES, &sock_ops))) return;
 820     old_event = sock->event;
 821     sock->mask    = req->mask;
 822     sock->hmask   &= ~req->mask; /* re-enable held events */
 823     sock->event   = NULL;
 824     sock->window  = req->window;
 825     sock->message = req->msg;
 826     sock->wparam  = req->handle;  /* wparam is the socket handle */
 827     if (req->event) sock->event = get_event_obj( current->process, req->event, EVENT_MODIFY_STATE );
 828
 829     if (debug_level && sock->event) fprintf(stderr, "event ptr: %p\n", sock->event);
 830
 831     pollev = sock_reselect( sock );
 832     if ( pollev ) sock_try_event( sock, pollev );
 833
 834     if (sock->mask)
 835         sock->state |= FD_WINE_NONBLOCKING;
 836
 837     /* if a network event is pending, signal the event object
 838        it is possible that FD_CONNECT or FD_ACCEPT network events has happened
 839        before a WSAEventSelect() was done on it.
 840        (when dealing with Asynchronous socket)  */
 841     if (sock->pmask & sock->mask) sock_wake_up( sock, pollev );
 842
 843     if (old_event) release_object( old_event ); /* we're through with it */
 844     release_object( &sock->obj );
 845 }
 846
 847 /* get socket event parameters */
 848 DECL_HANDLER(get_socket_event)
 849 {
 850     struct sock *sock;
 851
 852     sock = (struct sock *)get_handle_obj( current->process, req->handle, FILE_READ_ATTRIBUTES, &sock_ops );
 853     if (!sock)
 854     {
 855         reply->mask  = 0;
 856         reply->pmask = 0;
 857         reply->state = 0;
 858         set_error( WSAENOTSOCK );
 859         return;
 860     }
 861     reply->mask  = sock->mask;
 862     reply->pmask = sock->pmask;
 863     reply->state = sock->state;
 864     set_reply_data( sock->errors, min( get_reply_max_size(), sizeof(sock->errors) ));
 865
 866     if (req->service)
 867     {
 868         if (req->c_event)
 869         {
 870             struct event *cevent = get_event_obj( current->process, req->c_event,
 871                                                   EVENT_MODIFY_STATE );
 872             if (cevent)
 873             {
 874                 reset_event( cevent );
 875                 release_object( cevent );
 876             }
 877         }
 878         sock->pmask = 0;
 879         sock_reselect( sock );
 880     }
 881     release_object( &sock->obj );
 882 }
 883
 884 /* re-enable pending socket events */
 885 DECL_HANDLER(enable_socket_event)
 886 {
 887     struct sock *sock;
 888     int pollev;
 889
 890     if (!(sock = (struct sock*)get_handle_obj( current->process, req->handle,
 891                                                FILE_WRITE_ATTRIBUTES, &sock_ops)))
 892         return;
 893
 894     sock->pmask &= ~req->mask; /* is this safe? */
 895     sock->hmask &= ~req->mask;
 896     if ( req->mask & FD_READ )
 897         sock->hmask &= ~FD_CLOSE;
 898     sock->state |= req->sstate;
 899     sock->state &= ~req->cstate;
 900     if ( sock->type != SOCK_STREAM ) sock->state &= ~STREAM_FLAG_MASK;
 901
 902     pollev = sock_reselect( sock );
 903     if ( pollev ) sock_try_event( sock, pollev );
 904
 905     release_object( &sock->obj );
 906 }
 907
 908 DECL_HANDLER(set_socket_deferred)
 909 {
 910     struct sock *sock, *acceptsock;
 911
 912     sock=(struct sock *)get_handle_obj( current->process, req->handle, FILE_WRITE_ATTRIBUTES, &sock_ops );
 913     if ( !sock )
 914     {
 915         set_error( WSAENOTSOCK );
 916         return;
 917     }
 918     acceptsock = (struct sock *)get_handle_obj( current->process, req->deferred, 0, &sock_ops );
 919     if ( !acceptsock )
 920     {
 921         release_object( sock );
 922         set_error( WSAENOTSOCK );
 923         return;
 924     }
 925     sock->deferred = acceptsock;
 926     release_object( sock );
 927 }