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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, 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 "ntstatus.h"
  56 #define WIN32_NO_STATUS
  57 #include "windef.h"
  58 #include "winbase.h"
  59 #include "wincon.h"
  60 #include "winternl.h"
  61 #include "wine/library.h"
  62
  63 #include "file.h"
  64 #include "process.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 struct timeval server_start_time = { 0, 0 };  /* server startup time */
 118
 119 static struct master_socket *master_socket;  /* the master socket object */
 120 static int force_shutdown;
 121
 122 /* socket communication static structures */
 123 static struct iovec myiovec;
 124 static struct msghdr msghdr;
 125 #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 126 struct cmsg_fd
 127 {
 128     struct
 129     {
 130         size_t len;   /* size of structure */
 131         int    level; /* SOL_SOCKET */
 132         int    type;  /* SCM_RIGHTS */
 133     } header;
 134     int fd;           /* fd to pass */
 135 };
 136 static struct cmsg_fd cmsg = { { sizeof(cmsg.header) + sizeof(cmsg.fd), SOL_SOCKET, SCM_RIGHTS }, -1 };
 137 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 138
 139 /* complain about a protocol error and terminate the client connection */
 140 void fatal_protocol_error( struct thread *thread, const char *err, ... )
 141 {
 142     va_list args;
 143
 144     va_start( args, err );
 145     fprintf( stderr, "Protocol error:%04x: ", thread->id );
 146     vfprintf( stderr, err, args );
 147     va_end( args );
 148     thread->exit_code = 1;
 149     kill_thread( thread, 1 );
 150 }
 151
 152 /* complain about a protocol error and terminate the client connection */
 153 void fatal_protocol_perror( struct thread *thread, const char *err, ... )
 154 {
 155     va_list args;
 156
 157     va_start( args, err );
 158     fprintf( stderr, "Protocol error:%04x: ", thread->id );
 159     vfprintf( stderr, err, args );
 160     perror( " " );
 161     va_end( args );
 162     thread->exit_code = 1;
 163     kill_thread( thread, 1 );
 164 }
 165
 166 /* die on a fatal error */
 167 void fatal_error( const char *err, ... )
 168 {
 169     va_list args;
 170
 171     va_start( args, err );
 172     fprintf( stderr, "wineserver: " );
 173     vfprintf( stderr, err, args );
 174     va_end( args );
 175     exit(1);
 176 }
 177
 178 /* die on a fatal error */
 179 void fatal_perror( const char *err, ... )
 180 {
 181     va_list args;
 182
 183     va_start( args, err );
 184     fprintf( stderr, "wineserver: " );
 185     vfprintf( stderr, err, args );
 186     perror( " " );
 187     va_end( args );
 188     exit(1);
 189 }
 190
 191 /* allocate the reply data */
 192 void *set_reply_data_size( data_size_t size )
 193 {
 194     assert( size <= get_reply_max_size() );
 195     if (size && !(current->reply_data = mem_alloc( size ))) size = 0;
 196     current->reply_size = size;
 197     return current->reply_data;
 198 }
 199
 200 /* write the remaining part of the reply */
 201 void write_reply( struct thread *thread )
 202 {
 203     int ret;
 204
 205     if ((ret = write( get_unix_fd( thread->reply_fd ),
 206                       (char *)thread->reply_data + thread->reply_size - thread->reply_towrite,
 207                       thread->reply_towrite )) >= 0)
 208     {
 209         if (!(thread->reply_towrite -= ret))
 210         {
 211             free( thread->reply_data );
 212             thread->reply_data = NULL;
 213             /* sent everything, can go back to waiting for requests */
 214             set_fd_events( thread->request_fd, POLLIN );
 215             set_fd_events( thread->reply_fd, 0 );
 216         }
 217         return;
 218     }
 219     if (errno == EPIPE)
 220         kill_thread( thread, 0 );  /* normal death */
 221     else if (errno != EWOULDBLOCK && errno != EAGAIN)
 222         fatal_protocol_perror( thread, "reply write" );
 223 }
 224
 225 /* send a reply to the current thread */
 226 static void send_reply( union generic_reply *reply )
 227 {
 228     int ret;
 229
 230     if (!current->reply_size)
 231     {
 232         if ((ret = write( get_unix_fd( current->reply_fd ),
 233                           reply, sizeof(*reply) )) != sizeof(*reply)) goto error;
 234     }
 235     else
 236     {
 237         struct iovec vec[2];
 238
 239         vec[0].iov_base = (void *)reply;
 240         vec[0].iov_len  = sizeof(*reply);
 241         vec[1].iov_base = current->reply_data;
 242         vec[1].iov_len  = current->reply_size;
 243
 244         if ((ret = writev( get_unix_fd( current->reply_fd ), vec, 2 )) < sizeof(*reply)) goto error;
 245
 246         if ((current->reply_towrite = current->reply_size - (ret - sizeof(*reply))))
 247         {
 248             /* couldn't write it all, wait for POLLOUT */
 249             set_fd_events( current->reply_fd, POLLOUT );
 250             set_fd_events( current->request_fd, 0 );
 251             return;
 252         }
 253     }
 254     free( current->reply_data );
 255     current->reply_data = NULL;
 256     return;
 257
 258  error:
 259     if (ret >= 0)
 260         fatal_protocol_error( current, "partial write %d\n", ret );
 261     else if (errno == EPIPE)
 262         kill_thread( current, 0 );  /* normal death */
 263     else
 264         fatal_protocol_perror( current, "reply write" );
 265 }
 266
 267 /* call a request handler */
 268 static void call_req_handler( struct thread *thread )
 269 {
 270     union generic_reply reply;
 271     enum request req = thread->req.request_header.req;
 272
 273     current = thread;
 274     current->reply_size = 0;
 275     clear_error();
 276     memset( &reply, 0, sizeof(reply) );
 277
 278     if (debug_level) trace_request();
 279
 280     if (req < REQ_NB_REQUESTS)
 281         req_handlers[req]( &current->req, &reply );
 282     else
 283         set_error( STATUS_NOT_IMPLEMENTED );
 284
 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
 295         {
 296             current->exit_code = 1;
 297             kill_thread( current, 1 );  /* no way to continue without reply fd */
 298         }
 299     }
 300     current = NULL;
 301 }
 302
 303 /* read a request from a thread */
 304 void read_request( struct thread *thread )
 305 {
 306     int ret;
 307
 308     if (!thread->req_toread)  /* no pending request */
 309     {
 310         if ((ret = read( get_unix_fd( thread->request_fd ), &thread->req,
 311                          sizeof(thread->req) )) != sizeof(thread->req)) goto error;
 312         if (!(thread->req_toread = thread->req.request_header.request_size))
 313         {
 314             /* no data, handle request at once */
 315             call_req_handler( thread );
 316             return;
 317         }
 318         if (!(thread->req_data = malloc( thread->req_toread )))
 319         {
 320             fatal_protocol_error( thread, "no memory for %u bytes request %d\n",
 321                                   thread->req_toread, thread->req.request_header.req );
 322             return;
 323         }
 324     }
 325
 326     /* read the variable sized data */
 327     for (;;)
 328     {
 329         ret = read( get_unix_fd( thread->request_fd ),
 330                     (char *)thread->req_data + thread->req.request_header.request_size
 331                       - thread->req_toread,
 332                     thread->req_toread );
 333         if (ret <= 0) break;
 334         if (!(thread->req_toread -= ret))
 335         {
 336             call_req_handler( thread );
 337             free( thread->req_data );
 338             thread->req_data = NULL;
 339             return;
 340         }
 341     }
 342
 343 error:
 344     if (!ret)  /* closed pipe */
 345         kill_thread( thread, 0 );
 346     else if (ret > 0)
 347         fatal_protocol_error( thread, "partial read %d\n", ret );
 348     else if (errno != EWOULDBLOCK && errno != EAGAIN)
 349         fatal_protocol_perror( thread, "read" );
 350 }
 351
 352 /* receive a file descriptor on the process socket */
 353 int receive_fd( struct process *process )
 354 {
 355     struct send_fd data;
 356     int fd, ret;
 357
 358 #ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 359     msghdr.msg_accrightslen = sizeof(int);
 360     msghdr.msg_accrights = (void *)&fd;
 361 #else  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 362     msghdr.msg_control    = &cmsg;
 363     msghdr.msg_controllen = sizeof(cmsg.header) + sizeof(fd);
 364     cmsg.fd = -1;
 365 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 366
 367     myiovec.iov_base = (void *)&data;
 368     myiovec.iov_len  = sizeof(data);
 369
 370     ret = recvmsg( get_unix_fd( process->msg_fd ), &msghdr, 0 );
 371 #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 372     fd = cmsg.fd;
 373 #endif
 374
 375     if (ret == sizeof(data))
 376     {
 377         struct thread *thread;
 378
 379         if (data.tid) thread = get_thread_from_id( data.tid );
 380         else thread = (struct thread *)grab_object( get_process_first_thread( process ));
 381
 382         if (!thread || thread->process != process || thread->state == TERMINATED)
 383         {
 384             if (debug_level)
 385                 fprintf( stderr, "%04x: *fd* %d <- %d bad thread id\n",
 386                          data.tid, data.fd, fd );
 387             close( fd );
 388         }
 389         else
 390         {
 391             if (debug_level)
 392                 fprintf( stderr, "%04x: *fd* %d <- %d\n",
 393                          thread->id, data.fd, fd );
 394             thread_add_inflight_fd( thread, data.fd, fd );
 395         }
 396         if (thread) release_object( thread );
 397         return 0;
 398     }
 399
 400     if (!ret)
 401     {
 402         kill_process( process, 0 );
 403     }
 404     else if (ret > 0)
 405     {
 406         fprintf( stderr, "Protocol error: process %04x: partial recvmsg %d for fd\n",
 407                  process->id, ret );
 408         kill_process( process, 1 );
 409     }
 410     else
 411     {
 412         if (errno != EWOULDBLOCK && errno != EAGAIN)
 413         {
 414             fprintf( stderr, "Protocol error: process %04x: ", process->id );
 415             perror( "recvmsg" );
 416             kill_process( process, 1 );
 417         }
 418     }
 419     return -1;
 420 }
 421
 422 /* send an fd to a client */
 423 int send_client_fd( struct process *process, int fd, obj_handle_t handle )
 424 {
 425     int ret;
 426
 427     if (debug_level)
 428         fprintf( stderr, "%04x: *fd* %p -> %d\n",
 429                  current ? current->id : process->id, handle, fd );
 430
 431 #ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 432     msghdr.msg_accrightslen = sizeof(fd);
 433     msghdr.msg_accrights = (void *)&fd;
 434 #else  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 435     msghdr.msg_control    = &cmsg;
 436     msghdr.msg_controllen = sizeof(cmsg.header) + sizeof(fd);
 437     cmsg.fd = fd;
 438 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 439
 440     myiovec.iov_base = (void *)&handle;
 441     myiovec.iov_len  = sizeof(handle);
 442
 443     ret = sendmsg( get_unix_fd( process->msg_fd ), &msghdr, 0 );
 444
 445     if (ret == sizeof(handle)) return 0;
 446
 447     if (ret >= 0)
 448     {
 449         fprintf( stderr, "Protocol error: process %04x: partial sendmsg %d\n", process->id, ret );
 450         kill_process( process, 1 );
 451     }
 452     else if (errno == EPIPE)
 453     {
 454         kill_process( process, 0 );
 455     }
 456     else
 457     {
 458         fprintf( stderr, "Protocol error: process %04x: ", process->id );
 459         perror( "sendmsg" );
 460         kill_process( process, 1 );
 461     }
 462     return -1;
 463 }
 464
 465 /* get current tick count to return to client */
 466 unsigned int get_tick_count(void)
 467 {
 468     return ((current_time.tv_sec - server_start_time.tv_sec) * 1000) +
 469            ((current_time.tv_usec - server_start_time.tv_usec) / 1000);
 470 }
 471
 472 static void master_socket_dump( struct object *obj, int verbose )
 473 {
 474     struct master_socket *sock = (struct master_socket *)obj;
 475     assert( obj->ops == &master_socket_ops );
 476     fprintf( stderr, "Master socket fd=%p\n", sock->fd );
 477 }
 478
 479 static void master_socket_destroy( struct object *obj )
 480 {
 481     struct master_socket *sock = (struct master_socket *)obj;
 482     assert( obj->ops == &master_socket_ops );
 483     release_object( sock->fd );
 484 }
 485
 486 /* handle a socket event */
 487 static void master_socket_poll_event( struct fd *fd, int event )
 488 {
 489     struct master_socket *sock = get_fd_user( fd );
 490     assert( master_socket->obj.ops == &master_socket_ops );
 491
 492     assert( sock == master_socket );  /* there is only one master socket */
 493
 494     if (event & (POLLERR | POLLHUP))
 495     {
 496         /* this is not supposed to happen */
 497         fprintf( stderr, "wineserver: Error on master socket\n" );
 498         set_fd_events( sock->fd, -1 );
 499     }
 500     else if (event & POLLIN)
 501     {
 502         struct sockaddr_un dummy;
 503         unsigned int len = sizeof(dummy);
 504         int client = accept( get_unix_fd( master_socket->fd ), (struct sockaddr *) &dummy, &len );
 505         if (client == -1) return;
 506         if (sock->timeout)
 507         {
 508             remove_timeout_user( sock->timeout );
 509             sock->timeout = NULL;
 510         }
 511         fcntl( client, F_SETFL, O_NONBLOCK );
 512         create_process( client, NULL, 0 );
 513     }
 514 }
 515
 516 /* remove the socket upon exit */
 517 static void socket_cleanup(void)
 518 {
 519     static int do_it_once;
 520     if (!do_it_once++) unlink( server_socket_name );
 521 }
 522
 523 /* create a directory and check its permissions */
 524 static void create_dir( const char *name, struct stat *st )
 525 {
 526     if (lstat( name, st ) == -1)
 527     {
 528         if (errno != ENOENT) fatal_perror( "lstat %s", name );
 529         if (mkdir( name, 0700 ) == -1 && errno != EEXIST) fatal_perror( "mkdir %s", name );
 530         if (lstat( name, st ) == -1) fatal_perror( "lstat %s", name );
 531     }
 532     if (!S_ISDIR(st->st_mode)) fatal_error( "%s is not a directory\n", name );
 533     if (st->st_uid != getuid()) fatal_error( "%s is not owned by you\n", name );
 534     if (st->st_mode & 077) fatal_error( "%s must not be accessible by other users\n", name );
 535 }
 536
 537 /* create the server directory and chdir to it */
 538 static void create_server_dir( const char *dir )
 539 {
 540     char *p, *server_dir;
 541     struct stat st, st2;
 542
 543     if (!(server_dir = strdup( dir ))) fatal_error( "out of memory\n" );
 544
 545     /* first create the base directory if needed */
 546
 547     p = strrchr( server_dir, '/' );
 548     *p = 0;
 549     create_dir( server_dir, &st );
 550
 551     /* now create the server directory */
 552
 553     *p = '/';
 554     create_dir( server_dir, &st );
 555
 556     if (chdir( server_dir ) == -1) fatal_perror( "chdir %s", server_dir );
 557     if (stat( ".", &st2 ) == -1) fatal_perror( "stat %s", server_dir );
 558     if (st.st_dev != st2.st_dev || st.st_ino != st2.st_ino)
 559         fatal_error( "chdir did not end up in %s\n", server_dir );
 560
 561     free( server_dir );
 562 }
 563
 564 /* create the lock file and return its file descriptor */
 565 static int create_server_lock(void)
 566 {
 567     struct stat st;
 568     int fd;
 569
 570     if (lstat( server_lock_name, &st ) == -1)
 571     {
 572         if (errno != ENOENT)
 573             fatal_perror( "lstat %s/%s", wine_get_server_dir(), server_lock_name );
 574     }
 575     else
 576     {
 577         if (!S_ISREG(st.st_mode))
 578             fatal_error( "%s/%s is not a regular file\n", wine_get_server_dir(), server_lock_name );
 579     }
 580
 581     if ((fd = open( server_lock_name, O_CREAT|O_TRUNC|O_WRONLY, 0600 )) == -1)
 582         fatal_perror( "error creating %s/%s", wine_get_server_dir(), server_lock_name );
 583     return fd;
 584 }
 585
 586 /* wait for the server lock */
 587 int wait_for_lock(void)
 588 {
 589     const char *server_dir = wine_get_server_dir();
 590     int fd, r;
 591     struct flock fl;
 592
 593     if (!server_dir) return 0;  /* no server dir, so no lock to wait on */
 594
 595     create_server_dir( server_dir );
 596     fd = create_server_lock();
 597
 598     fl.l_type   = F_WRLCK;
 599     fl.l_whence = SEEK_SET;
 600     fl.l_start  = 0;
 601     fl.l_len    = 1;
 602     r = fcntl( fd, F_SETLKW, &fl );
 603     close(fd);
 604
 605     return r;
 606 }
 607
 608 /* kill the wine server holding the lock */
 609 int kill_lock_owner( int sig )
 610 {
 611     const char *server_dir = wine_get_server_dir();
 612     int fd, i, ret = 0;
 613     pid_t pid = 0;
 614     struct flock fl;
 615
 616     if (!server_dir) return 0;  /* no server dir, nothing to do */
 617
 618     create_server_dir( server_dir );
 619     fd = create_server_lock();
 620
 621     for (i = 0; i < 10; i++)
 622     {
 623         fl.l_type   = F_WRLCK;
 624         fl.l_whence = SEEK_SET;
 625         fl.l_start  = 0;
 626         fl.l_len    = 1;
 627         if (fcntl( fd, F_GETLK, &fl ) == -1) goto done;
 628         if (fl.l_type != F_WRLCK) goto done;  /* the file is not locked */
 629         if (!pid)  /* first time around */
 630         {
 631             if (!(pid = fl.l_pid)) goto done;  /* shouldn't happen */
 632             if (sig == -1)
 633             {
 634                 if (kill( pid, SIGINT ) == -1) goto done;
 635                 kill( pid, SIGCONT );
 636                 ret = 1;
 637             }
 638             else  /* just send the specified signal and return */
 639             {
 640                 ret = (kill( pid, sig ) != -1);
 641                 goto done;
 642             }
 643         }
 644         else if (fl.l_pid != pid) goto done;  /* no longer the same process */
 645         sleep( 1 );
 646     }
 647     /* waited long enough, now kill it */
 648     kill( pid, SIGKILL );
 649
 650  done:
 651     close( fd );
 652     return ret;
 653 }
 654
 655 /* acquire the main server lock */
 656 static void acquire_lock(void)
 657 {
 658     struct sockaddr_un addr;
 659     struct stat st;
 660     struct flock fl;
 661     int fd, slen, got_lock = 0;
 662
 663     fd = create_server_lock();
 664
 665     fl.l_type   = F_WRLCK;
 666     fl.l_whence = SEEK_SET;
 667     fl.l_start  = 0;
 668     fl.l_len    = 1;
 669     if (fcntl( fd, F_SETLK, &fl ) != -1)
 670     {
 671         /* check for crashed server */
 672         if (stat( server_socket_name, &st ) != -1 &&   /* there is a leftover socket */
 673             stat( "core", &st ) != -1 && st.st_size)   /* and there is a non-empty core file */
 674         {
 675             fprintf( stderr,
 676                      "Warning: a previous instance of the wine server seems to have crashed.\n"
 677                      "Please run 'gdb %s %s/core',\n"
 678                      "type 'backtrace' at the gdb prompt and report the results. Thanks.\n\n",
 679                      server_argv0, wine_get_server_dir() );
 680         }
 681         unlink( server_socket_name ); /* we got the lock, we can safely remove the socket */
 682         got_lock = 1;
 683         /* in that case we reuse fd without closing it, this ensures
 684          * that we hold the lock until the process exits */
 685     }
 686     else
 687     {
 688         switch(errno)
 689         {
 690         case ENOLCK:
 691             break;
 692         case EACCES:
 693             /* check whether locks work at all on this file system */
 694             if (fcntl( fd, F_GETLK, &fl ) == -1) break;
 695             /* fall through */
 696         case EAGAIN:
 697             exit(2); /* we didn't get the lock, exit with special status */
 698         default:
 699             fatal_perror( "fcntl %s/%s", wine_get_server_dir(), server_lock_name );
 700         }
 701         /* it seems we can't use locks on this fs, so we will use the socket existence as lock */
 702         close( fd );
 703     }
 704
 705     if ((fd = socket( AF_UNIX, SOCK_STREAM, 0 )) == -1) fatal_perror( "socket" );
 706     addr.sun_family = AF_UNIX;
 707     strcpy( addr.sun_path, server_socket_name );
 708     slen = sizeof(addr) - sizeof(addr.sun_path) + strlen(addr.sun_path) + 1;
 709 #ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN
 710     addr.sun_len = slen;
 711 #endif
 712     if (bind( fd, (struct sockaddr *)&addr, slen ) == -1)
 713     {
 714         if ((errno == EEXIST) || (errno == EADDRINUSE))
 715         {
 716             if (got_lock)
 717                 fatal_error( "couldn't bind to the socket even though we hold the lock\n" );
 718             exit(2); /* we didn't get the lock, exit with special status */
 719         }
 720         fatal_perror( "bind" );
 721     }
 722     atexit( socket_cleanup );
 723     chmod( server_socket_name, 0600 );  /* make sure no other user can connect */
 724     if (listen( fd, 5 ) == -1) fatal_perror( "listen" );
 725
 726     if (!(master_socket = alloc_object( &master_socket_ops )) ||
 727         !(master_socket->fd = create_anonymous_fd( &master_socket_fd_ops, fd, &master_socket->obj )))
 728         fatal_error( "out of memory\n" );
 729     master_socket->timeout = NULL;
 730     set_fd_events( master_socket->fd, POLLIN );
 731     make_object_static( &master_socket->obj );
 732 }
 733
 734 /* open the master server socket and start waiting for new clients */
 735 void open_master_socket(void)
 736 {
 737     const char *server_dir = wine_get_server_dir();
 738     int fd, pid, status, sync_pipe[2];
 739     char dummy;
 740
 741     /* make sure no request is larger than the maximum size */
 742     assert( sizeof(union generic_request) == sizeof(struct request_max_size) );
 743     assert( sizeof(union generic_reply) == sizeof(struct request_max_size) );
 744
 745     if (!server_dir) fatal_error( "directory %s cannot be accessed\n", wine_get_config_dir() );
 746     create_server_dir( server_dir );
 747
 748     if (!foreground)
 749     {
 750         if (pipe( sync_pipe ) == -1) fatal_perror( "pipe" );
 751         pid = fork();
 752         switch( pid )
 753         {
 754         case 0:  /* child */
 755             setsid();
 756             close( sync_pipe[0] );
 757
 758             acquire_lock();
 759
 760             /* close stdin and stdout */
 761             if ((fd = open( "/dev/null", O_RDWR )) != -1)
 762             {
 763                 dup2( fd, 0 );
 764                 dup2( fd, 1 );
 765                 close( fd );
 766             }
 767
 768             /* signal parent */
 769             dummy = 0;
 770             write( sync_pipe[1], &dummy, 1 );
 771             close( sync_pipe[1] );
 772             break;
 773
 774         case -1:
 775             fatal_perror( "fork" );
 776             break;
 777
 778         default:  /* parent */
 779             close( sync_pipe[1] );
 780
 781             /* wait for child to signal us and then exit */
 782             if (read( sync_pipe[0], &dummy, 1 ) == 1) _exit(0);
 783
 784             /* child terminated, propagate exit status */
 785             wait4( pid, &status, 0, NULL );
 786             if (WIFEXITED(status)) _exit( WEXITSTATUS(status) );
 787             _exit(1);
 788         }
 789     }
 790     else  /* remain in the foreground */
 791     {
 792         acquire_lock();
 793     }
 794
 795     /* setup msghdr structure constant fields */
 796     msghdr.msg_name    = NULL;
 797     msghdr.msg_namelen = 0;
 798     msghdr.msg_iov     = &myiovec;
 799     msghdr.msg_iovlen  = 1;
 800
 801     /* init startup time */
 802     gettimeofday( &server_start_time, NULL );
 803
 804     /* init the process tracing mechanism */
 805     init_tracing_mechanism();
 806 }
 807
 808 /* master socket timer expiration handler */
 809 static void close_socket_timeout( void *arg )
 810 {
 811     master_socket->timeout = NULL;
 812     flush_registry();
 813
 814     /* if a new client is waiting, we keep on running */
 815     if (!force_shutdown && check_fd_events( master_socket->fd, POLLIN )) return;
 816
 817     if (debug_level) fprintf( stderr, "wineserver: exiting (pid=%ld)\n", (long) getpid() );
 818
 819 #ifdef DEBUG_OBJECTS
 820     close_objects();  /* shut down everything properly */
 821 #endif
 822     exit( force_shutdown );
 823 }
 824
 825 /* close the master socket and stop waiting for new clients */
 826 void close_master_socket(void)
 827 {
 828     if (master_socket_timeout == -1) return;  /* just keep running forever */
 829
 830     if (master_socket_timeout)
 831     {
 832         struct timeval when = current_time;
 833         add_timeout( &when, master_socket_timeout * 1000 );
 834         master_socket->timeout = add_timeout_user( &when, close_socket_timeout, NULL );
 835     }
 836     else close_socket_timeout( NULL );  /* close it right away */
 837 }
 838
 839 /* forced shutdown, used for wineserver -k */
 840 void shutdown_master_socket(void)
 841 {
 842     force_shutdown = 1;
 843     master_socket_timeout = 0;
 844     if (master_socket->timeout)
 845     {
 846         remove_timeout_user( master_socket->timeout );
 847         close_socket_timeout( NULL );
 848     }
 849     set_fd_events( master_socket->fd, -1 ); /* stop waiting for new clients */
 850 }