server/request.c

   1 /*
   2  * Server-side request handling
   3  *
   4  * Copyright (C) 1998 Alexandre Julliard
   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
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <assert.h>
  25 #include <errno.h>
  26 #include <fcntl.h>
  27 #ifdef HAVE_PWD_H
  28 #include <pwd.h>
  29 #endif
  30 #include <signal.h>
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <stdarg.h>
  34 #include <string.h>
  35 #include <sys/stat.h>
  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_WAIT_H
  42 # include <sys/wait.h>
  43 #endif
  44 #ifdef HAVE_SYS_UIO_H
  45 #include <sys/uio.h>
  46 #endif
  47 #ifdef HAVE_SYS_UN_H
  48 #include <sys/un.h>
  49 #endif
  50 #include <unistd.h>
  51 #ifdef HAVE_POLL_H
  52 #include <poll.h>
  53 #endif
  54
  55 #include "windef.h"
  56 #include "winbase.h"
  57 #include "wincon.h"
  58 #include "wine/library.h"
  59
  60 #include "file.h"
  61 #include "handle.h"
  62 #include "thread.h"
  63 #include "process.h"
  64 #include "user.h"
  65 #define WANT_REQUEST_HANDLERS
  66 #include "request.h"
  67
  68 /* Some versions of glibc don't define this */
  69 #ifndef SCM_RIGHTS
  70 #define SCM_RIGHTS 1
  71 #endif
  72
  73 /* path names for server master Unix socket */
  74 static const char * const server_socket_name = "socket";   /* name of the socket file */
  75 static const char * const server_lock_name = "lock";       /* name of the server lock file */
  76
  77 struct master_socket
  78 {
  79     struct object        obj;        /* object header */
  80     struct fd           *fd;         /* file descriptor of the master socket */
  81     struct timeout_user *timeout;    /* timeout on last process exit */
  82 };
  83
  84 static void master_socket_dump( struct object *obj, int verbose );
  85 static void master_socket_destroy( struct object *obj );
  86 static void master_socket_poll_event( struct fd *fd, int event );
  87
  88 static const struct object_ops master_socket_ops =
  89 {
  90     sizeof(struct master_socket),  /* size */
  91     master_socket_dump,            /* dump */
  92     no_add_queue,                  /* add_queue */
  93     NULL,                          /* remove_queue */
  94     NULL,                          /* signaled */
  95     NULL,                          /* satisfied */
  96     no_signal,                     /* signal */
  97     no_get_fd,                     /* get_fd */
  98     no_close_handle,               /* close_handle */
  99     master_socket_destroy          /* destroy */
 100 };
 101
 102 static const struct fd_ops master_socket_fd_ops =
 103 {
 104     NULL,                          /* get_poll_events */
 105     master_socket_poll_event,      /* poll_event */
 106     no_flush,                      /* flush */
 107     no_get_file_info,              /* get_file_info */
 108     no_queue_async,                /* queue_async */
 109     no_cancel_async                /* cancel_async */
 110 };
 111
 112
 113 struct thread *current = NULL;  /* thread handling the current request */
 114 unsigned int global_error = 0;  /* global error code for when no thread is current */
 115 time_t server_start_time = 0;  /* server startup time */
 116
 117 static struct master_socket *master_socket;  /* the master socket object */
 118
 119 /* socket communication static structures */
 120 static struct iovec myiovec;
 121 static struct msghdr msghdr;
 122 #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 123 struct cmsg_fd
 124 {
 125     int len;   /* size of structure */
 126     int level; /* SOL_SOCKET */
 127     int type;  /* SCM_RIGHTS */
 128     int fd;    /* fd to pass */
 129 };
 130 static struct cmsg_fd cmsg = { sizeof(cmsg), SOL_SOCKET, SCM_RIGHTS, -1 };
 131 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 132
 133 /* complain about a protocol error and terminate the client connection */
 134 void fatal_protocol_error( struct thread *thread, const char *err, ... )
 135 {
 136     va_list args;
 137
 138     va_start( args, err );
 139     fprintf( stderr, "Protocol error:%p: ", thread );
 140     vfprintf( stderr, err, args );
 141     va_end( args );
 142     thread->exit_code = 1;
 143     kill_thread( thread, 1 );
 144 }
 145
 146 /* complain about a protocol error and terminate the client connection */
 147 void fatal_protocol_perror( struct thread *thread, const char *err, ... )
 148 {
 149     va_list args;
 150
 151     va_start( args, err );
 152     fprintf( stderr, "Protocol error:%p: ", thread );
 153     vfprintf( stderr, err, args );
 154     perror( " " );
 155     va_end( args );
 156     thread->exit_code = 1;
 157     kill_thread( thread, 1 );
 158 }
 159
 160 /* die on a fatal error */
 161 void fatal_error( const char *err, ... )
 162 {
 163     va_list args;
 164
 165     va_start( args, err );
 166     fprintf( stderr, "wineserver: " );
 167     vfprintf( stderr, err, args );
 168     va_end( args );
 169     exit(1);
 170 }
 171
 172 /* die on a fatal error */
 173 void fatal_perror( const char *err, ... )
 174 {
 175     va_list args;
 176
 177     va_start( args, err );
 178     fprintf( stderr, "wineserver: " );
 179     vfprintf( stderr, err, args );
 180     perror( " " );
 181     va_end( args );
 182     exit(1);
 183 }
 184
 185 /* allocate the reply data */
 186 void *set_reply_data_size( size_t size )
 187 {
 188     assert( size <= get_reply_max_size() );
 189     if (size && !(current->reply_data = mem_alloc( size ))) size = 0;
 190     current->reply_size = size;
 191     return current->reply_data;
 192 }
 193
 194 /* write the remaining part of the reply */
 195 void write_reply( struct thread *thread )
 196 {
 197     int ret;
 198
 199     if ((ret = write( get_unix_fd( thread->reply_fd ),
 200                       (char *)thread->reply_data + thread->reply_size - thread->reply_towrite,
 201                       thread->reply_towrite )) >= 0)
 202     {
 203         if (!(thread->reply_towrite -= ret))
 204         {
 205             free( thread->reply_data );
 206             thread->reply_data = NULL;
 207             /* sent everything, can go back to waiting for requests */
 208             set_fd_events( thread->request_fd, POLLIN );
 209             set_fd_events( thread->reply_fd, 0 );
 210         }
 211         return;
 212     }
 213     if (errno == EPIPE)
 214         kill_thread( thread, 0 );  /* normal death */
 215     else if (errno != EWOULDBLOCK && errno != EAGAIN)
 216         fatal_protocol_perror( thread, "reply write" );
 217 }
 218
 219 /* send a reply to the current thread */
 220 static void send_reply( union generic_reply *reply )
 221 {
 222     int ret;
 223
 224     if (!current->reply_size)
 225     {
 226         if ((ret = write( get_unix_fd( current->reply_fd ),
 227                           reply, sizeof(*reply) )) != sizeof(*reply)) goto error;
 228     }
 229     else
 230     {
 231         struct iovec vec[2];
 232
 233         vec[0].iov_base = (void *)reply;
 234         vec[0].iov_len  = sizeof(*reply);
 235         vec[1].iov_base = current->reply_data;
 236         vec[1].iov_len  = current->reply_size;
 237
 238         if ((ret = writev( get_unix_fd( current->reply_fd ), vec, 2 )) < sizeof(*reply)) goto error;
 239
 240         if ((current->reply_towrite = current->reply_size - (ret - sizeof(*reply))))
 241         {
 242             /* couldn't write it all, wait for POLLOUT */
 243             set_fd_events( current->reply_fd, POLLOUT );
 244             set_fd_events( current->request_fd, 0 );
 245             return;
 246         }
 247     }
 248     if (current->reply_data)
 249     {
 250         free( current->reply_data );
 251         current->reply_data = NULL;
 252     }
 253     return;
 254
 255  error:
 256     if (ret >= 0)
 257         fatal_protocol_error( current, "partial write %d\n", ret );
 258     else if (errno == EPIPE)
 259         kill_thread( current, 0 );  /* normal death */
 260     else
 261         fatal_protocol_perror( current, "reply write" );
 262 }
 263
 264 /* call a request handler */
 265 static void call_req_handler( struct thread *thread )
 266 {
 267     union generic_reply reply;
 268     enum request req = thread->req.request_header.req;
 269
 270     current = thread;
 271     current->reply_size = 0;
 272     clear_error();
 273     memset( &reply, 0, sizeof(reply) );
 274
 275     if (debug_level) trace_request();
 276
 277     if (req < REQ_NB_REQUESTS)
 278     {
 279         req_handlers[req]( &current->req, &reply );
 280         if (current)
 281         {
 282             if (current->reply_fd)
 283             {
 284                 reply.reply_header.error = current->error;
 285                 reply.reply_header.reply_size = current->reply_size;
 286                 if (debug_level) trace_reply( req, &reply );
 287                 send_reply( &reply );
 288             }
 289             else fatal_protocol_error( current, "no reply fd for request %d\n", req );
 290         }
 291         current = NULL;
 292         return;
 293     }
 294     fatal_protocol_error( current, "bad request %d\n", req );
 295 }
 296
 297 /* read a request from a thread */
 298 void read_request( struct thread *thread )
 299 {
 300     int ret;
 301
 302     if (!thread->req_toread)  /* no pending request */
 303     {
 304         if ((ret = read( get_unix_fd( thread->request_fd ), &thread->req,
 305                          sizeof(thread->req) )) != sizeof(thread->req)) goto error;
 306         if (!(thread->req_toread = thread->req.request_header.request_size))
 307         {
 308             /* no data, handle request at once */
 309             call_req_handler( thread );
 310             return;
 311         }
 312         if (!(thread->req_data = malloc( thread->req_toread )))
 313             fatal_protocol_error( thread, "no memory for %d bytes request\n", thread->req_toread );
 314     }
 315
 316     /* read the variable sized data */
 317     for (;;)
 318     {
 319         ret = read( get_unix_fd( thread->request_fd ),
 320                     (char *)thread->req_data + thread->req.request_header.request_size
 321                       - thread->req_toread,
 322                     thread->req_toread );
 323         if (ret <= 0) break;
 324         if (!(thread->req_toread -= ret))
 325         {
 326             call_req_handler( thread );
 327             free( thread->req_data );
 328             thread->req_data = NULL;
 329             return;
 330         }
 331     }
 332
 333 error:
 334     if (!ret)  /* closed pipe */
 335         kill_thread( thread, 0 );
 336     else if (ret > 0)
 337         fatal_protocol_error( thread, "partial read %d\n", ret );
 338     else if (errno != EWOULDBLOCK && errno != EAGAIN)
 339         fatal_protocol_perror( thread, "read" );
 340 }
 341
 342 /* receive a file descriptor on the process socket */
 343 int receive_fd( struct process *process )
 344 {
 345     struct send_fd data;
 346     int fd, ret;
 347
 348 #ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 349     msghdr.msg_accrightslen = sizeof(int);
 350     msghdr.msg_accrights = (void *)&fd;
 351 #else  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 352     msghdr.msg_control    = &cmsg;
 353     msghdr.msg_controllen = sizeof(cmsg);
 354     cmsg.fd = -1;
 355 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 356
 357     myiovec.iov_base = (void *)&data;
 358     myiovec.iov_len  = sizeof(data);
 359
 360     ret = recvmsg( get_unix_fd( process->msg_fd ), &msghdr, 0 );
 361 #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 362     fd = cmsg.fd;
 363 #endif
 364
 365     if (ret == sizeof(data))
 366     {
 367         struct thread *thread;
 368
 369         if (data.tid) thread = get_thread_from_id( data.tid );
 370         else thread = (struct thread *)grab_object( get_process_first_thread( process ));
 371
 372         if (!thread || thread->process != process || thread->state == TERMINATED)
 373         {
 374             if (debug_level)
 375                 fprintf( stderr, "%04x: *fd* %d <- %d bad thread id\n",
 376                          data.tid, data.fd, fd );
 377             close( fd );
 378         }
 379         else
 380         {
 381             if (debug_level)
 382                 fprintf( stderr, "%04x: *fd* %d <- %d\n",
 383                          thread->id, data.fd, fd );
 384             thread_add_inflight_fd( thread, data.fd, fd );
 385         }
 386         if (thread) release_object( thread );
 387         return 0;
 388     }
 389
 390     if (ret >= 0)
 391     {
 392         if (ret > 0)
 393             fprintf( stderr, "Protocol error: process %p: partial recvmsg %d for fd\n",
 394                      process, ret );
 395         kill_process( process, NULL, 1 );
 396     }
 397     else
 398     {
 399         if (errno != EWOULDBLOCK && errno != EAGAIN)
 400         {
 401             fprintf( stderr, "Protocol error: process %p: ", process );
 402             perror( "recvmsg" );
 403             kill_process( process, NULL, 1 );
 404         }
 405     }
 406     return -1;
 407 }
 408
 409 /* send an fd to a client */
 410 int send_client_fd( struct process *process, int fd, obj_handle_t handle )
 411 {
 412     int ret;
 413
 414     if (debug_level)
 415         fprintf( stderr, "%04x: *fd* %p -> %d\n",
 416                  current ? current->id : process->id, handle, fd );
 417
 418 #ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 419     msghdr.msg_accrightslen = sizeof(fd);
 420     msghdr.msg_accrights = (void *)&fd;
 421 #else  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 422     msghdr.msg_control    = &cmsg;
 423     msghdr.msg_controllen = sizeof(cmsg);
 424     cmsg.fd = fd;
 425 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 426
 427     myiovec.iov_base = (void *)&handle;
 428     myiovec.iov_len  = sizeof(handle);
 429
 430     ret = sendmsg( get_unix_fd( process->msg_fd ), &msghdr, 0 );
 431
 432     if (ret == sizeof(handle)) return 0;
 433
 434     if (ret >= 0)
 435     {
 436         fprintf( stderr, "Protocol error: process %p: partial sendmsg %d\n", process, ret );
 437         kill_process( process, NULL, 1 );
 438     }
 439     else if (errno == EPIPE)
 440     {
 441         kill_process( process, NULL, 0 );
 442     }
 443     else
 444     {
 445         fprintf( stderr, "Protocol error: process %p: ", process );
 446         perror( "sendmsg" );
 447         kill_process( process, NULL, 1 );
 448     }
 449     return -1;
 450 }
 451
 452 /* get current tick count to return to client */
 453 unsigned int get_tick_count(void)
 454 {
 455     struct timeval t;
 456     gettimeofday( &t, NULL );
 457     return ((t.tv_sec - server_start_time) * 1000) + (t.tv_usec / 1000);
 458 }
 459
 460 static void master_socket_dump( struct object *obj, int verbose )
 461 {
 462     struct master_socket *sock = (struct master_socket *)obj;
 463     assert( obj->ops == &master_socket_ops );
 464     fprintf( stderr, "Master socket fd=%p\n", sock->fd );
 465 }
 466
 467 static void master_socket_destroy( struct object *obj )
 468 {
 469     struct master_socket *sock = (struct master_socket *)obj;
 470     assert( obj->ops == &master_socket_ops );
 471     release_object( sock->fd );
 472 }
 473
 474 /* handle a socket event */
 475 static void master_socket_poll_event( struct fd *fd, int event )
 476 {
 477     struct master_socket *sock = get_fd_user( fd );
 478     assert( master_socket->obj.ops == &master_socket_ops );
 479
 480     assert( sock == master_socket );  /* there is only one master socket */
 481
 482     if (event & (POLLERR | POLLHUP))
 483     {
 484         /* this is not supposed to happen */
 485         fprintf( stderr, "wineserver: Error on master socket\n" );
 486         release_object( sock );
 487     }
 488     else if (event & POLLIN)
 489     {
 490         struct sockaddr_un dummy;
 491         unsigned int len = sizeof(dummy);
 492         int client = accept( get_unix_fd( master_socket->fd ), (struct sockaddr *) &dummy, &len );
 493         if (client == -1) return;
 494         if (sock->timeout)
 495         {
 496             remove_timeout_user( sock->timeout );
 497             sock->timeout = NULL;
 498         }
 499         fcntl( client, F_SETFL, O_NONBLOCK );
 500         create_process( client );
 501     }
 502 }
 503
 504 /* remove the socket upon exit */
 505 static void socket_cleanup(void)
 506 {
 507     static int do_it_once;
 508     if (!do_it_once++) unlink( server_socket_name );
 509 }
 510
 511 /* create a directory and check its permissions */
 512 static void create_dir( const char *name, struct stat *st )
 513 {
 514     if (lstat( name, st ) == -1)
 515     {
 516         if (errno != ENOENT) fatal_perror( "lstat %s", name );
 517         if (mkdir( name, 0700 ) == -1 && errno != EEXIST) fatal_perror( "mkdir %s", name );
 518         if (lstat( name, st ) == -1) fatal_perror( "lstat %s", name );
 519     }
 520     if (!S_ISDIR(st->st_mode)) fatal_error( "%s is not a directory\n", name );
 521     if (st->st_uid != getuid()) fatal_error( "%s is not owned by you\n", name );
 522     if (st->st_mode & 077) fatal_error( "%s must not be accessible by other users\n", name );
 523 }
 524
 525 /* create the server directory and chdir to it */
 526 static void create_server_dir(void)
 527 {
 528     char *p, *server_dir;
 529     struct stat st, st2;
 530
 531     if (!(server_dir = strdup( wine_get_server_dir() ))) fatal_error( "out of memory\n" );
 532
 533     /* first create the base directory if needed */
 534
 535     p = strrchr( server_dir, '/' );
 536     *p = 0;
 537     create_dir( server_dir, &st );
 538
 539     /* now create the server directory */
 540
 541     *p = '/';
 542     create_dir( server_dir, &st );
 543
 544     if (chdir( server_dir ) == -1) fatal_perror( "chdir %s", server_dir );
 545     if (stat( ".", &st2 ) == -1) fatal_perror( "stat %s", server_dir );
 546     if (st.st_dev != st2.st_dev || st.st_ino != st2.st_ino)
 547         fatal_error( "chdir did not end up in %s\n", server_dir );
 548
 549     free( server_dir );
 550 }
 551
 552 /* create the lock file and return its file descriptor */
 553 static int create_server_lock(void)
 554 {
 555     struct stat st;
 556     int fd;
 557
 558     if (lstat( server_lock_name, &st ) == -1)
 559     {
 560         if (errno != ENOENT)
 561             fatal_perror( "lstat %s/%s", wine_get_server_dir(), server_lock_name );
 562     }
 563     else
 564     {
 565         if (!S_ISREG(st.st_mode))
 566             fatal_error( "%s/%s is not a regular file\n", wine_get_server_dir(), server_lock_name );
 567     }
 568
 569     if ((fd = open( server_lock_name, O_CREAT|O_TRUNC|O_WRONLY, 0600 )) == -1)
 570         fatal_perror( "error creating %s/%s", wine_get_server_dir(), server_lock_name );
 571     return fd;
 572 }
 573
 574 /* wait for the server lock */
 575 int wait_for_lock(void)
 576 {
 577     int fd, r;
 578     struct flock fl;
 579
 580     create_server_dir();
 581     fd = create_server_lock();
 582
 583     fl.l_type   = F_WRLCK;
 584     fl.l_whence = SEEK_SET;
 585     fl.l_start  = 0;
 586     fl.l_len    = 1;
 587     r = fcntl( fd, F_SETLKW, &fl );
 588     close(fd);
 589
 590     return r;
 591 }
 592
 593 /* kill the wine server holding the lock */
 594 int kill_lock_owner( int sig )
 595 {
 596     int fd, i, ret = 0;
 597     pid_t pid = 0;
 598     struct flock fl;
 599
 600     create_server_dir();
 601     fd = create_server_lock();
 602
 603     for (i = 0; i < 10; i++)
 604     {
 605         fl.l_type   = F_WRLCK;
 606         fl.l_whence = SEEK_SET;
 607         fl.l_start  = 0;
 608         fl.l_len    = 1;
 609         if (fcntl( fd, F_GETLK, &fl ) == -1) goto done;
 610         if (fl.l_type != F_WRLCK) goto done;  /* the file is not locked */
 611         if (!pid)  /* first time around */
 612         {
 613             if (!(pid = fl.l_pid)) goto done;  /* shouldn't happen */
 614             if (sig == -1)
 615             {
 616                 if (kill( pid, SIGINT ) == -1) goto done;
 617                 kill( pid, SIGCONT );
 618                 ret = 1;
 619             }
 620             else  /* just send the specified signal and return */
 621             {
 622                 ret = (kill( pid, sig ) != -1);
 623                 goto done;
 624             }
 625         }
 626         else if (fl.l_pid != pid) goto done;  /* no longer the same process */
 627         sleep( 1 );
 628     }
 629     /* waited long enough, now kill it */
 630     kill( pid, SIGKILL );
 631
 632  done:
 633     close( fd );
 634     return ret;
 635 }
 636
 637 /* acquire the main server lock */
 638 static void acquire_lock(void)
 639 {
 640     struct sockaddr_un addr;
 641     struct stat st;
 642     struct flock fl;
 643     int fd, slen, got_lock = 0;
 644
 645     fd = create_server_lock();
 646
 647     fl.l_type   = F_WRLCK;
 648     fl.l_whence = SEEK_SET;
 649     fl.l_start  = 0;
 650     fl.l_len    = 1;
 651     if (fcntl( fd, F_SETLK, &fl ) != -1)
 652     {
 653         /* check for crashed server */
 654         if (stat( server_socket_name, &st ) != -1 &&   /* there is a leftover socket */
 655             stat( "core", &st ) != -1 && st.st_size)   /* and there is a non-empty core file */
 656         {
 657             fprintf( stderr,
 658                      "Warning: a previous instance of the wine server seems to have crashed.\n"
 659                      "Please run 'gdb %s %s/core',\n"
 660                      "type 'backtrace' at the gdb prompt and report the results. Thanks.\n\n",
 661                      server_argv0, wine_get_server_dir() );
 662         }
 663         unlink( server_socket_name ); /* we got the lock, we can safely remove the socket */
 664         got_lock = 1;
 665         /* in that case we reuse fd without closing it, this ensures
 666          * that we hold the lock until the process exits */
 667     }
 668     else
 669     {
 670         switch(errno)
 671         {
 672         case ENOLCK:
 673             break;
 674         case EACCES:
 675             /* check whether locks work at all on this file system */
 676             if (fcntl( fd, F_GETLK, &fl ) == -1) break;
 677             /* fall through */
 678         case EAGAIN:
 679             exit(2); /* we didn't get the lock, exit with special status */
 680         default:
 681             fatal_perror( "fcntl %s/%s", wine_get_server_dir(), server_lock_name );
 682         }
 683         /* it seems we can't use locks on this fs, so we will use the socket existence as lock */
 684         close( fd );
 685     }
 686
 687     if ((fd = socket( AF_UNIX, SOCK_STREAM, 0 )) == -1) fatal_perror( "socket" );
 688     addr.sun_family = AF_UNIX;
 689     strcpy( addr.sun_path, server_socket_name );
 690     slen = sizeof(addr) - sizeof(addr.sun_path) + strlen(addr.sun_path) + 1;
 691 #ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN
 692     addr.sun_len = slen;
 693 #endif
 694     if (bind( fd, (struct sockaddr *)&addr, slen ) == -1)
 695     {
 696         if ((errno == EEXIST) || (errno == EADDRINUSE))
 697         {
 698             if (got_lock)
 699                 fatal_error( "couldn't bind to the socket even though we hold the lock\n" );
 700             exit(2); /* we didn't get the lock, exit with special status */
 701         }
 702         fatal_perror( "bind" );
 703     }
 704     atexit( socket_cleanup );
 705     chmod( server_socket_name, 0600 );  /* make sure no other user can connect */
 706     if (listen( fd, 5 ) == -1) fatal_perror( "listen" );
 707
 708     if (!(master_socket = alloc_object( &master_socket_ops )) ||
 709         !(master_socket->fd = create_anonymous_fd( &master_socket_fd_ops, fd, &master_socket->obj )))
 710         fatal_error( "out of memory\n" );
 711     master_socket->timeout = NULL;
 712     set_fd_events( master_socket->fd, POLLIN );
 713 }
 714
 715 /* open the master server socket and start waiting for new clients */
 716 void open_master_socket(void)
 717 {
 718     int fd, pid, status, sync_pipe[2];
 719     char dummy;
 720
 721     /* make sure no request is larger than the maximum size */
 722     assert( sizeof(union generic_request) == sizeof(struct request_max_size) );
 723     assert( sizeof(union generic_reply) == sizeof(struct request_max_size) );
 724
 725     create_server_dir();
 726
 727     if (!foreground)
 728     {
 729         if (pipe( sync_pipe ) == -1) fatal_perror( "pipe" );
 730         pid = fork();
 731         switch( pid )
 732         {
 733         case 0:  /* child */
 734             setsid();
 735             close( sync_pipe[0] );
 736
 737             acquire_lock();
 738
 739             /* close stdin and stdout */
 740             if ((fd = open( "/dev/null", O_RDWR )) != -1)
 741             {
 742                 dup2( fd, 0 );
 743                 dup2( fd, 1 );
 744                 close( fd );
 745             }
 746
 747             /* signal parent */
 748             write( sync_pipe[1], &dummy, 1 );
 749             close( sync_pipe[1] );
 750             break;
 751
 752         case -1:
 753             fatal_perror( "fork" );
 754             break;
 755
 756         default:  /* parent */
 757             close( sync_pipe[1] );
 758
 759             /* wait for child to signal us and then exit */
 760             if (read( sync_pipe[0], &dummy, 1 ) == 1) _exit(0);
 761
 762             /* child terminated, propagate exit status */
 763             wait4( pid, &status, 0, NULL );
 764             if (WIFEXITED(status)) _exit( WEXITSTATUS(status) );
 765             _exit(1);
 766         }
 767     }
 768     else  /* remain in the foreground */
 769     {
 770         acquire_lock();
 771     }
 772
 773     /* setup msghdr structure constant fields */
 774     msghdr.msg_name    = NULL;
 775     msghdr.msg_namelen = 0;
 776     msghdr.msg_iov     = &myiovec;
 777     msghdr.msg_iovlen  = 1;
 778
 779     /* init startup time */
 780     server_start_time = time(NULL);
 781 }
 782
 783 /* master socket timer expiration handler */
 784 static void close_socket_timeout( void *arg )
 785 {
 786     master_socket->timeout = NULL;
 787     flush_registry();
 788
 789     /* if a new client is waiting, we keep on running */
 790     if (check_fd_events( master_socket->fd, POLLIN )) return;
 791
 792     if (debug_level) fprintf( stderr, "wineserver: exiting (pid=%ld)\n", (long) getpid() );
 793
 794 #ifdef DEBUG_OBJECTS
 795     /* shut down everything properly */
 796     release_object( master_socket );
 797     close_signals();
 798     close_global_handles();
 799     close_registry();
 800     dump_objects();  /* dump any remaining objects */
 801 #else
 802     exit(0);
 803 #endif
 804 }
 805
 806 /* close the master socket and stop waiting for new clients */
 807 void close_master_socket(void)
 808 {
 809     struct timeval when;
 810
 811     if (master_socket_timeout == -1) return;  /* just keep running forever */
 812
 813     if (master_socket_timeout)
 814     {
 815         gettimeofday( &when, NULL );
 816         add_timeout( &when, master_socket_timeout * 1000 );
 817         master_socket->timeout = add_timeout_user( &when, close_socket_timeout, NULL );
 818     }
 819     else close_socket_timeout( NULL );  /* close it right away */
 820 }
 821
 822 /* lock/unlock the master socket to stop accepting new clients */
 823 void lock_master_socket( int locked )
 824 {
 825     set_fd_events( master_socket->fd, locked ? 0 : POLLIN );
 826 }