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_map_access,                 /* map_access */
  99     no_lookup_name,                /* lookup_name */
 100     no_close_handle,               /* close_handle */
 101     master_socket_destroy          /* destroy */
 102 };
 103
 104 static const struct fd_ops master_socket_fd_ops =
 105 {
 106     NULL,                          /* get_poll_events */
 107     master_socket_poll_event,      /* poll_event */
 108     no_flush,                      /* flush */
 109     no_get_file_info,              /* get_file_info */
 110     no_queue_async,                /* queue_async */
 111     no_cancel_async                /* cancel_async */
 112 };
 113
 114
 115 struct thread *current = NULL;  /* thread handling the current request */
 116 unsigned int global_error = 0;  /* global error code for when no thread is current */
 117 time_t server_start_time = 0;  /* server startup time */
 118
 119 static struct master_socket *master_socket;  /* the master socket object */
 120
 121 /* socket communication static structures */
 122 static struct iovec myiovec;
 123 static struct msghdr msghdr;
 124 #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 125 struct cmsg_fd
 126 {
 127     struct
 128     {
 129         size_t len;   /* size of structure */
 130         int    level; /* SOL_SOCKET */
 131         int    type;  /* SCM_RIGHTS */
 132     } header;
 133     int fd;           /* fd to pass */
 134 };
 135 static struct cmsg_fd cmsg = { { sizeof(cmsg.header) + sizeof(cmsg.fd), SOL_SOCKET, SCM_RIGHTS }, -1 };
 136 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 137
 138 /* complain about a protocol error and terminate the client connection */
 139 void fatal_protocol_error( struct thread *thread, const char *err, ... )
 140 {
 141     va_list args;
 142
 143     va_start( args, err );
 144     fprintf( stderr, "Protocol error:%p: ", thread );
 145     vfprintf( stderr, err, args );
 146     va_end( args );
 147     thread->exit_code = 1;
 148     kill_thread( thread, 1 );
 149 }
 150
 151 /* complain about a protocol error and terminate the client connection */
 152 void fatal_protocol_perror( struct thread *thread, const char *err, ... )
 153 {
 154     va_list args;
 155
 156     va_start( args, err );
 157     fprintf( stderr, "Protocol error:%p: ", thread );
 158     vfprintf( stderr, err, args );
 159     perror( " " );
 160     va_end( args );
 161     thread->exit_code = 1;
 162     kill_thread( thread, 1 );
 163 }
 164
 165 /* die on a fatal error */
 166 void fatal_error( const char *err, ... )
 167 {
 168     va_list args;
 169
 170     va_start( args, err );
 171     fprintf( stderr, "wineserver: " );
 172     vfprintf( stderr, err, args );
 173     va_end( args );
 174     exit(1);
 175 }
 176
 177 /* die on a fatal error */
 178 void fatal_perror( const char *err, ... )
 179 {
 180     va_list args;
 181
 182     va_start( args, err );
 183     fprintf( stderr, "wineserver: " );
 184     vfprintf( stderr, err, args );
 185     perror( " " );
 186     va_end( args );
 187     exit(1);
 188 }
 189
 190 /* allocate the reply data */
 191 void *set_reply_data_size( size_t size )
 192 {
 193     assert( size <= get_reply_max_size() );
 194     if (size && !(current->reply_data = mem_alloc( size ))) size = 0;
 195     current->reply_size = size;
 196     return current->reply_data;
 197 }
 198
 199 /* write the remaining part of the reply */
 200 void write_reply( struct thread *thread )
 201 {
 202     int ret;
 203
 204     if ((ret = write( get_unix_fd( thread->reply_fd ),
 205                       (char *)thread->reply_data + thread->reply_size - thread->reply_towrite,
 206                       thread->reply_towrite )) >= 0)
 207     {
 208         if (!(thread->reply_towrite -= ret))
 209         {
 210             free( thread->reply_data );
 211             thread->reply_data = NULL;
 212             /* sent everything, can go back to waiting for requests */
 213             set_fd_events( thread->request_fd, POLLIN );
 214             set_fd_events( thread->reply_fd, 0 );
 215         }
 216         return;
 217     }
 218     if (errno == EPIPE)
 219         kill_thread( thread, 0 );  /* normal death */
 220     else if (errno != EWOULDBLOCK && errno != EAGAIN)
 221         fatal_protocol_perror( thread, "reply write" );
 222 }
 223
 224 /* send a reply to the current thread */
 225 static void send_reply( union generic_reply *reply )
 226 {
 227     int ret;
 228
 229     if (!current->reply_size)
 230     {
 231         if ((ret = write( get_unix_fd( current->reply_fd ),
 232                           reply, sizeof(*reply) )) != sizeof(*reply)) goto error;
 233     }
 234     else
 235     {
 236         struct iovec vec[2];
 237
 238         vec[0].iov_base = (void *)reply;
 239         vec[0].iov_len  = sizeof(*reply);
 240         vec[1].iov_base = current->reply_data;
 241         vec[1].iov_len  = current->reply_size;
 242
 243         if ((ret = writev( get_unix_fd( current->reply_fd ), vec, 2 )) < sizeof(*reply)) goto error;
 244
 245         if ((current->reply_towrite = current->reply_size - (ret - sizeof(*reply))))
 246         {
 247             /* couldn't write it all, wait for POLLOUT */
 248             set_fd_events( current->reply_fd, POLLOUT );
 249             set_fd_events( current->request_fd, 0 );
 250             return;
 251         }
 252     }
 253     if (current->reply_data)
 254     {
 255         free( current->reply_data );
 256         current->reply_data = NULL;
 257     }
 258     return;
 259
 260  error:
 261     if (ret >= 0)
 262         fatal_protocol_error( current, "partial write %d\n", ret );
 263     else if (errno == EPIPE)
 264         kill_thread( current, 0 );  /* normal death */
 265     else
 266         fatal_protocol_perror( current, "reply write" );
 267 }
 268
 269 /* call a request handler */
 270 static void call_req_handler( struct thread *thread )
 271 {
 272     union generic_reply reply;
 273     enum request req = thread->req.request_header.req;
 274
 275     current = thread;
 276     current->reply_size = 0;
 277     clear_error();
 278     memset( &reply, 0, sizeof(reply) );
 279
 280     if (debug_level) trace_request();
 281
 282     if (req < REQ_NB_REQUESTS)
 283     {
 284         req_handlers[req]( &current->req, &reply );
 285         if (current)
 286         {
 287             if (current->reply_fd)
 288             {
 289                 reply.reply_header.error = current->error;
 290                 reply.reply_header.reply_size = current->reply_size;
 291                 if (debug_level) trace_reply( req, &reply );
 292                 send_reply( &reply );
 293             }
 294             else fatal_protocol_error( current, "no reply fd for request %d\n", req );
 295         }
 296         current = NULL;
 297         return;
 298     }
 299     fatal_protocol_error( current, "bad request %d\n", req );
 300 }
 301
 302 /* read a request from a thread */
 303 void read_request( struct thread *thread )
 304 {
 305     int ret;
 306
 307     if (!thread->req_toread)  /* no pending request */
 308     {
 309         if ((ret = read( get_unix_fd( thread->request_fd ), &thread->req,
 310                          sizeof(thread->req) )) != sizeof(thread->req)) goto error;
 311         if (!(thread->req_toread = thread->req.request_header.request_size))
 312         {
 313             /* no data, handle request at once */
 314             call_req_handler( thread );
 315             return;
 316         }
 317         if (!(thread->req_data = malloc( thread->req_toread )))
 318             fatal_protocol_error( thread, "no memory for %d bytes request\n", thread->req_toread );
 319     }
 320
 321     /* read the variable sized data */
 322     for (;;)
 323     {
 324         ret = read( get_unix_fd( thread->request_fd ),
 325                     (char *)thread->req_data + thread->req.request_header.request_size
 326                       - thread->req_toread,
 327                     thread->req_toread );
 328         if (ret <= 0) break;
 329         if (!(thread->req_toread -= ret))
 330         {
 331             call_req_handler( thread );
 332             free( thread->req_data );
 333             thread->req_data = NULL;
 334             return;
 335         }
 336     }
 337
 338 error:
 339     if (!ret)  /* closed pipe */
 340         kill_thread( thread, 0 );
 341     else if (ret > 0)
 342         fatal_protocol_error( thread, "partial read %d\n", ret );
 343     else if (errno != EWOULDBLOCK && errno != EAGAIN)
 344         fatal_protocol_perror( thread, "read" );
 345 }
 346
 347 /* receive a file descriptor on the process socket */
 348 int receive_fd( struct process *process )
 349 {
 350     struct send_fd data;
 351     int fd, ret;
 352
 353 #ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 354     msghdr.msg_accrightslen = sizeof(int);
 355     msghdr.msg_accrights = (void *)&fd;
 356 #else  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 357     msghdr.msg_control    = &cmsg;
 358     msghdr.msg_controllen = sizeof(cmsg.header) + sizeof(fd);
 359     cmsg.fd = -1;
 360 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 361
 362     myiovec.iov_base = (void *)&data;
 363     myiovec.iov_len  = sizeof(data);
 364
 365     ret = recvmsg( get_unix_fd( process->msg_fd ), &msghdr, 0 );
 366 #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 367     fd = cmsg.fd;
 368 #endif
 369
 370     if (ret == sizeof(data))
 371     {
 372         struct thread *thread;
 373
 374         if (data.tid) thread = get_thread_from_id( data.tid );
 375         else thread = (struct thread *)grab_object( get_process_first_thread( process ));
 376
 377         if (!thread || thread->process != process || thread->state == TERMINATED)
 378         {
 379             if (debug_level)
 380                 fprintf( stderr, "%04x: *fd* %d <- %d bad thread id\n",
 381                          data.tid, data.fd, fd );
 382             close( fd );
 383         }
 384         else
 385         {
 386             if (debug_level)
 387                 fprintf( stderr, "%04x: *fd* %d <- %d\n",
 388                          thread->id, data.fd, fd );
 389             thread_add_inflight_fd( thread, data.fd, fd );
 390         }
 391         if (thread) release_object( thread );
 392         return 0;
 393     }
 394
 395     if (ret >= 0)
 396     {
 397         if (ret > 0)
 398             fprintf( stderr, "Protocol error: process %p: partial recvmsg %d for fd\n",
 399                      process, ret );
 400         kill_process( process, NULL, 1 );
 401     }
 402     else
 403     {
 404         if (errno != EWOULDBLOCK && errno != EAGAIN)
 405         {
 406             fprintf( stderr, "Protocol error: process %p: ", process );
 407             perror( "recvmsg" );
 408             kill_process( process, NULL, 1 );
 409         }
 410     }
 411     return -1;
 412 }
 413
 414 /* send an fd to a client */
 415 int send_client_fd( struct process *process, int fd, obj_handle_t handle )
 416 {
 417     int ret;
 418
 419     if (debug_level)
 420         fprintf( stderr, "%04x: *fd* %p -> %d\n",
 421                  current ? current->id : process->id, handle, fd );
 422
 423 #ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 424     msghdr.msg_accrightslen = sizeof(fd);
 425     msghdr.msg_accrights = (void *)&fd;
 426 #else  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 427     msghdr.msg_control    = &cmsg;
 428     msghdr.msg_controllen = sizeof(cmsg.header) + sizeof(fd);
 429     cmsg.fd = fd;
 430 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 431
 432     myiovec.iov_base = (void *)&handle;
 433     myiovec.iov_len  = sizeof(handle);
 434
 435     ret = sendmsg( get_unix_fd( process->msg_fd ), &msghdr, 0 );
 436
 437     if (ret == sizeof(handle)) return 0;
 438
 439     if (ret >= 0)
 440     {
 441         fprintf( stderr, "Protocol error: process %p: partial sendmsg %d\n", process, ret );
 442         kill_process( process, NULL, 1 );
 443     }
 444     else if (errno == EPIPE)
 445     {
 446         kill_process( process, NULL, 0 );
 447     }
 448     else
 449     {
 450         fprintf( stderr, "Protocol error: process %p: ", process );
 451         perror( "sendmsg" );
 452         kill_process( process, NULL, 1 );
 453     }
 454     return -1;
 455 }
 456
 457 /* get current tick count to return to client */
 458 unsigned int get_tick_count(void)
 459 {
 460     struct timeval t;
 461     gettimeofday( &t, NULL );
 462     return ((t.tv_sec - server_start_time) * 1000) + (t.tv_usec / 1000);
 463 }
 464
 465 static void master_socket_dump( struct object *obj, int verbose )
 466 {
 467     struct master_socket *sock = (struct master_socket *)obj;
 468     assert( obj->ops == &master_socket_ops );
 469     fprintf( stderr, "Master socket fd=%p\n", sock->fd );
 470 }
 471
 472 static void master_socket_destroy( struct object *obj )
 473 {
 474     struct master_socket *sock = (struct master_socket *)obj;
 475     assert( obj->ops == &master_socket_ops );
 476     release_object( sock->fd );
 477 }
 478
 479 /* handle a socket event */
 480 static void master_socket_poll_event( struct fd *fd, int event )
 481 {
 482     struct master_socket *sock = get_fd_user( fd );
 483     assert( master_socket->obj.ops == &master_socket_ops );
 484
 485     assert( sock == master_socket );  /* there is only one master socket */
 486
 487     if (event & (POLLERR | POLLHUP))
 488     {
 489         /* this is not supposed to happen */
 490         fprintf( stderr, "wineserver: Error on master socket\n" );
 491         release_object( sock );
 492     }
 493     else if (event & POLLIN)
 494     {
 495         struct sockaddr_un dummy;
 496         unsigned int len = sizeof(dummy);
 497         int client = accept( get_unix_fd( master_socket->fd ), (struct sockaddr *) &dummy, &len );
 498         if (client == -1) return;
 499         if (sock->timeout)
 500         {
 501             remove_timeout_user( sock->timeout );
 502             sock->timeout = NULL;
 503         }
 504         fcntl( client, F_SETFL, O_NONBLOCK );
 505         create_process( client );
 506     }
 507 }
 508
 509 /* remove the socket upon exit */
 510 static void socket_cleanup(void)
 511 {
 512     static int do_it_once;
 513     if (!do_it_once++) unlink( server_socket_name );
 514 }
 515
 516 /* create a directory and check its permissions */
 517 static void create_dir( const char *name, struct stat *st )
 518 {
 519     if (lstat( name, st ) == -1)
 520     {
 521         if (errno != ENOENT) fatal_perror( "lstat %s", name );
 522         if (mkdir( name, 0700 ) == -1 && errno != EEXIST) fatal_perror( "mkdir %s", name );
 523         if (lstat( name, st ) == -1) fatal_perror( "lstat %s", name );
 524     }
 525     if (!S_ISDIR(st->st_mode)) fatal_error( "%s is not a directory\n", name );
 526     if (st->st_uid != getuid()) fatal_error( "%s is not owned by you\n", name );
 527     if (st->st_mode & 077) fatal_error( "%s must not be accessible by other users\n", name );
 528 }
 529
 530 /* create the server directory and chdir to it */
 531 static void create_server_dir(void)
 532 {
 533     char *p, *server_dir;
 534     struct stat st, st2;
 535
 536     if (!(server_dir = strdup( wine_get_server_dir() ))) fatal_error( "out of memory\n" );
 537
 538     /* first create the base directory if needed */
 539
 540     p = strrchr( server_dir, '/' );
 541     *p = 0;
 542     create_dir( server_dir, &st );
 543
 544     /* now create the server directory */
 545
 546     *p = '/';
 547     create_dir( server_dir, &st );
 548
 549     if (chdir( server_dir ) == -1) fatal_perror( "chdir %s", server_dir );
 550     if (stat( ".", &st2 ) == -1) fatal_perror( "stat %s", server_dir );
 551     if (st.st_dev != st2.st_dev || st.st_ino != st2.st_ino)
 552         fatal_error( "chdir did not end up in %s\n", server_dir );
 553
 554     free( server_dir );
 555 }
 556
 557 /* create the lock file and return its file descriptor */
 558 static int create_server_lock(void)
 559 {
 560     struct stat st;
 561     int fd;
 562
 563     if (lstat( server_lock_name, &st ) == -1)
 564     {
 565         if (errno != ENOENT)
 566             fatal_perror( "lstat %s/%s", wine_get_server_dir(), server_lock_name );
 567     }
 568     else
 569     {
 570         if (!S_ISREG(st.st_mode))
 571             fatal_error( "%s/%s is not a regular file\n", wine_get_server_dir(), server_lock_name );
 572     }
 573
 574     if ((fd = open( server_lock_name, O_CREAT|O_TRUNC|O_WRONLY, 0600 )) == -1)
 575         fatal_perror( "error creating %s/%s", wine_get_server_dir(), server_lock_name );
 576     return fd;
 577 }
 578
 579 /* wait for the server lock */
 580 int wait_for_lock(void)
 581 {
 582     int fd, r;
 583     struct flock fl;
 584
 585     create_server_dir();
 586     fd = create_server_lock();
 587
 588     fl.l_type   = F_WRLCK;
 589     fl.l_whence = SEEK_SET;
 590     fl.l_start  = 0;
 591     fl.l_len    = 1;
 592     r = fcntl( fd, F_SETLKW, &fl );
 593     close(fd);
 594
 595     return r;
 596 }
 597
 598 /* kill the wine server holding the lock */
 599 int kill_lock_owner( int sig )
 600 {
 601     int fd, i, ret = 0;
 602     pid_t pid = 0;
 603     struct flock fl;
 604
 605     create_server_dir();
 606     fd = create_server_lock();
 607
 608     for (i = 0; i < 10; i++)
 609     {
 610         fl.l_type   = F_WRLCK;
 611         fl.l_whence = SEEK_SET;
 612         fl.l_start  = 0;
 613         fl.l_len    = 1;
 614         if (fcntl( fd, F_GETLK, &fl ) == -1) goto done;
 615         if (fl.l_type != F_WRLCK) goto done;  /* the file is not locked */
 616         if (!pid)  /* first time around */
 617         {
 618             if (!(pid = fl.l_pid)) goto done;  /* shouldn't happen */
 619             if (sig == -1)
 620             {
 621                 if (kill( pid, SIGINT ) == -1) goto done;
 622                 kill( pid, SIGCONT );
 623                 ret = 1;
 624             }
 625             else  /* just send the specified signal and return */
 626             {
 627                 ret = (kill( pid, sig ) != -1);
 628                 goto done;
 629             }
 630         }
 631         else if (fl.l_pid != pid) goto done;  /* no longer the same process */
 632         sleep( 1 );
 633     }
 634     /* waited long enough, now kill it */
 635     kill( pid, SIGKILL );
 636
 637  done:
 638     close( fd );
 639     return ret;
 640 }
 641
 642 /* acquire the main server lock */
 643 static void acquire_lock(void)
 644 {
 645     struct sockaddr_un addr;
 646     struct stat st;
 647     struct flock fl;
 648     int fd, slen, got_lock = 0;
 649
 650     fd = create_server_lock();
 651
 652     fl.l_type   = F_WRLCK;
 653     fl.l_whence = SEEK_SET;
 654     fl.l_start  = 0;
 655     fl.l_len    = 1;
 656     if (fcntl( fd, F_SETLK, &fl ) != -1)
 657     {
 658         /* check for crashed server */
 659         if (stat( server_socket_name, &st ) != -1 &&   /* there is a leftover socket */
 660             stat( "core", &st ) != -1 && st.st_size)   /* and there is a non-empty core file */
 661         {
 662             fprintf( stderr,
 663                      "Warning: a previous instance of the wine server seems to have crashed.\n"
 664                      "Please run 'gdb %s %s/core',\n"
 665                      "type 'backtrace' at the gdb prompt and report the results. Thanks.\n\n",
 666                      server_argv0, wine_get_server_dir() );
 667         }
 668         unlink( server_socket_name ); /* we got the lock, we can safely remove the socket */
 669         got_lock = 1;
 670         /* in that case we reuse fd without closing it, this ensures
 671          * that we hold the lock until the process exits */
 672     }
 673     else
 674     {
 675         switch(errno)
 676         {
 677         case ENOLCK:
 678             break;
 679         case EACCES:
 680             /* check whether locks work at all on this file system */
 681             if (fcntl( fd, F_GETLK, &fl ) == -1) break;
 682             /* fall through */
 683         case EAGAIN:
 684             exit(2); /* we didn't get the lock, exit with special status */
 685         default:
 686             fatal_perror( "fcntl %s/%s", wine_get_server_dir(), server_lock_name );
 687         }
 688         /* it seems we can't use locks on this fs, so we will use the socket existence as lock */
 689         close( fd );
 690     }
 691
 692     if ((fd = socket( AF_UNIX, SOCK_STREAM, 0 )) == -1) fatal_perror( "socket" );
 693     addr.sun_family = AF_UNIX;
 694     strcpy( addr.sun_path, server_socket_name );
 695     slen = sizeof(addr) - sizeof(addr.sun_path) + strlen(addr.sun_path) + 1;
 696 #ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN
 697     addr.sun_len = slen;
 698 #endif
 699     if (bind( fd, (struct sockaddr *)&addr, slen ) == -1)
 700     {
 701         if ((errno == EEXIST) || (errno == EADDRINUSE))
 702         {
 703             if (got_lock)
 704                 fatal_error( "couldn't bind to the socket even though we hold the lock\n" );
 705             exit(2); /* we didn't get the lock, exit with special status */
 706         }
 707         fatal_perror( "bind" );
 708     }
 709     atexit( socket_cleanup );
 710     chmod( server_socket_name, 0600 );  /* make sure no other user can connect */
 711     if (listen( fd, 5 ) == -1) fatal_perror( "listen" );
 712
 713     if (!(master_socket = alloc_object( &master_socket_ops )) ||
 714         !(master_socket->fd = create_anonymous_fd( &master_socket_fd_ops, fd, &master_socket->obj )))
 715         fatal_error( "out of memory\n" );
 716     master_socket->timeout = NULL;
 717     set_fd_events( master_socket->fd, POLLIN );
 718 }
 719
 720 /* open the master server socket and start waiting for new clients */
 721 void open_master_socket(void)
 722 {
 723     int fd, pid, status, sync_pipe[2];
 724     char dummy;
 725
 726     /* make sure no request is larger than the maximum size */
 727     assert( sizeof(union generic_request) == sizeof(struct request_max_size) );
 728     assert( sizeof(union generic_reply) == sizeof(struct request_max_size) );
 729
 730     create_server_dir();
 731
 732     if (!foreground)
 733     {
 734         if (pipe( sync_pipe ) == -1) fatal_perror( "pipe" );
 735         pid = fork();
 736         switch( pid )
 737         {
 738         case 0:  /* child */
 739             setsid();
 740             close( sync_pipe[0] );
 741
 742             acquire_lock();
 743
 744             /* close stdin and stdout */
 745             if ((fd = open( "/dev/null", O_RDWR )) != -1)
 746             {
 747                 dup2( fd, 0 );
 748                 dup2( fd, 1 );
 749                 close( fd );
 750             }
 751
 752             /* signal parent */
 753             dummy = 0;
 754             write( sync_pipe[1], &dummy, 1 );
 755             close( sync_pipe[1] );
 756             break;
 757
 758         case -1:
 759             fatal_perror( "fork" );
 760             break;
 761
 762         default:  /* parent */
 763             close( sync_pipe[1] );
 764
 765             /* wait for child to signal us and then exit */
 766             if (read( sync_pipe[0], &dummy, 1 ) == 1) _exit(0);
 767
 768             /* child terminated, propagate exit status */
 769             wait4( pid, &status, 0, NULL );
 770             if (WIFEXITED(status)) _exit( WEXITSTATUS(status) );
 771             _exit(1);
 772         }
 773     }
 774     else  /* remain in the foreground */
 775     {
 776         acquire_lock();
 777     }
 778
 779     /* setup msghdr structure constant fields */
 780     msghdr.msg_name    = NULL;
 781     msghdr.msg_namelen = 0;
 782     msghdr.msg_iov     = &myiovec;
 783     msghdr.msg_iovlen  = 1;
 784
 785     /* init startup time */
 786     server_start_time = time(NULL);
 787 }
 788
 789 /* master socket timer expiration handler */
 790 static void close_socket_timeout( void *arg )
 791 {
 792     master_socket->timeout = NULL;
 793     flush_registry();
 794
 795     /* if a new client is waiting, we keep on running */
 796     if (check_fd_events( master_socket->fd, POLLIN )) return;
 797
 798     if (debug_level) fprintf( stderr, "wineserver: exiting (pid=%ld)\n", (long) getpid() );
 799
 800 #ifdef DEBUG_OBJECTS
 801     /* shut down everything properly */
 802     release_object( master_socket );
 803     close_signals();
 804     close_global_handles();
 805     close_registry();
 806     close_directories();
 807     dump_objects();  /* dump any remaining objects */
 808 #else
 809     exit(0);
 810 #endif
 811 }
 812
 813 /* close the master socket and stop waiting for new clients */
 814 void close_master_socket(void)
 815 {
 816     struct timeval when;
 817
 818     if (master_socket_timeout == -1) return;  /* just keep running forever */
 819
 820     if (master_socket_timeout)
 821     {
 822         gettimeofday( &when, NULL );
 823         add_timeout( &when, master_socket_timeout * 1000 );
 824         master_socket->timeout = add_timeout_user( &when, close_socket_timeout, NULL );
 825     }
 826     else close_socket_timeout( NULL );  /* close it right away */
 827 }
 828
 829 /* lock/unlock the master socket to stop accepting new clients */
 830 void lock_master_socket( int locked )
 831 {
 832     set_fd_events( master_socket->fd, locked ? 0 : POLLIN );
 833 }