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 };
  82
  83 static void master_socket_dump( struct object *obj, int verbose );
  84 static void master_socket_destroy( struct object *obj );
  85 static void master_socket_poll_event( struct fd *fd, int event );
  86
  87 static const struct object_ops master_socket_ops =
  88 {
  89     sizeof(struct master_socket),  /* size */
  90     master_socket_dump,            /* dump */
  91     no_get_type,                   /* get_type */
  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     default_get_sd,                /* get_sd */
 100     default_set_sd,                /* set_sd */
 101     no_lookup_name,                /* lookup_name */
 102     no_open_file,                  /* open_file */
 103     no_close_handle,               /* close_handle */
 104     master_socket_destroy          /* destroy */
 105 };
 106
 107 static const struct fd_ops master_socket_fd_ops =
 108 {
 109     NULL,                          /* get_poll_events */
 110     master_socket_poll_event,      /* poll_event */
 111     NULL,                          /* flush */
 112     NULL,                          /* get_fd_type */
 113     NULL,                          /* ioctl */
 114     NULL,                          /* queue_async */
 115     NULL,                          /* reselect_async */
 116     NULL                           /* cancel_async */
 117 };
 118
 119
 120 struct thread *current = NULL;  /* thread handling the current request */
 121 unsigned int global_error = 0;  /* global error code for when no thread is current */
 122 timeout_t server_start_time = 0;  /* server startup time */
 123 int server_dir_fd = -1;    /* file descriptor for the server dir */
 124 int config_dir_fd = -1;    /* file descriptor for the config dir */
 125
 126 static struct master_socket *master_socket;  /* the master socket object */
 127 static struct timeout_user *master_timeout;
 128
 129 /* socket communication static structures */
 130 static struct iovec myiovec;
 131 static struct msghdr msghdr;
 132 #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 133 struct cmsg_fd
 134 {
 135     struct
 136     {
 137         size_t len;   /* size of structure */
 138         int    level; /* SOL_SOCKET */
 139         int    type;  /* SCM_RIGHTS */
 140     } header;
 141     int fd;           /* fd to pass */
 142 };
 143 static struct cmsg_fd cmsg = { { sizeof(cmsg.header) + sizeof(cmsg.fd), SOL_SOCKET, SCM_RIGHTS }, -1 };
 144 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 145
 146 /* complain about a protocol error and terminate the client connection */
 147 void fatal_protocol_error( struct thread *thread, const char *err, ... )
 148 {
 149     va_list args;
 150
 151     va_start( args, err );
 152     fprintf( stderr, "Protocol error:%04x: ", thread->id );
 153     vfprintf( stderr, err, args );
 154     va_end( args );
 155     thread->exit_code = 1;
 156     kill_thread( thread, 1 );
 157 }
 158
 159 /* complain about a protocol error and terminate the client connection */
 160 void fatal_protocol_perror( struct thread *thread, const char *err, ... )
 161 {
 162     va_list args;
 163
 164     va_start( args, err );
 165     fprintf( stderr, "Protocol error:%04x: ", thread->id );
 166     vfprintf( stderr, err, args );
 167     perror( " " );
 168     va_end( args );
 169     thread->exit_code = 1;
 170     kill_thread( thread, 1 );
 171 }
 172
 173 /* die on a fatal error */
 174 void fatal_error( const char *err, ... )
 175 {
 176     va_list args;
 177
 178     va_start( args, err );
 179     fprintf( stderr, "wineserver: " );
 180     vfprintf( stderr, err, args );
 181     va_end( args );
 182     exit(1);
 183 }
 184
 185 /* die on a fatal error */
 186 void fatal_perror( const char *err, ... )
 187 {
 188     va_list args;
 189
 190     va_start( args, err );
 191     fprintf( stderr, "wineserver: " );
 192     vfprintf( stderr, err, args );
 193     perror( " " );
 194     va_end( args );
 195     exit(1);
 196 }
 197
 198 /* allocate the reply data */
 199 void *set_reply_data_size( data_size_t size )
 200 {
 201     assert( size <= get_reply_max_size() );
 202     if (size && !(current->reply_data = mem_alloc( size ))) size = 0;
 203     current->reply_size = size;
 204     return current->reply_data;
 205 }
 206
 207 /* write the remaining part of the reply */
 208 void write_reply( struct thread *thread )
 209 {
 210     int ret;
 211
 212     if ((ret = write( get_unix_fd( thread->reply_fd ),
 213                       (char *)thread->reply_data + thread->reply_size - thread->reply_towrite,
 214                       thread->reply_towrite )) >= 0)
 215     {
 216         if (!(thread->reply_towrite -= ret))
 217         {
 218             free( thread->reply_data );
 219             thread->reply_data = NULL;
 220             /* sent everything, can go back to waiting for requests */
 221             set_fd_events( thread->request_fd, POLLIN );
 222             set_fd_events( thread->reply_fd, 0 );
 223         }
 224         return;
 225     }
 226     if (errno == EPIPE)
 227         kill_thread( thread, 0 );  /* normal death */
 228     else if (errno != EWOULDBLOCK && errno != EAGAIN)
 229         fatal_protocol_perror( thread, "reply write" );
 230 }
 231
 232 /* send a reply to the current thread */
 233 static void send_reply( union generic_reply *reply )
 234 {
 235     int ret;
 236
 237     if (!current->reply_size)
 238     {
 239         if ((ret = write( get_unix_fd( current->reply_fd ),
 240                           reply, sizeof(*reply) )) != sizeof(*reply)) goto error;
 241     }
 242     else
 243     {
 244         struct iovec vec[2];
 245
 246         vec[0].iov_base = (void *)reply;
 247         vec[0].iov_len  = sizeof(*reply);
 248         vec[1].iov_base = current->reply_data;
 249         vec[1].iov_len  = current->reply_size;
 250
 251         if ((ret = writev( get_unix_fd( current->reply_fd ), vec, 2 )) < sizeof(*reply)) goto error;
 252
 253         if ((current->reply_towrite = current->reply_size - (ret - sizeof(*reply))))
 254         {
 255             /* couldn't write it all, wait for POLLOUT */
 256             set_fd_events( current->reply_fd, POLLOUT );
 257             set_fd_events( current->request_fd, 0 );
 258             return;
 259         }
 260     }
 261     free( current->reply_data );
 262     current->reply_data = NULL;
 263     return;
 264
 265  error:
 266     if (ret >= 0)
 267         fatal_protocol_error( current, "partial write %d\n", ret );
 268     else if (errno == EPIPE)
 269         kill_thread( current, 0 );  /* normal death */
 270     else
 271         fatal_protocol_perror( current, "reply write" );
 272 }
 273
 274 /* call a request handler */
 275 static void call_req_handler( struct thread *thread )
 276 {
 277     union generic_reply reply;
 278     enum request req = thread->req.request_header.req;
 279
 280     current = thread;
 281     current->reply_size = 0;
 282     clear_error();
 283     memset( &reply, 0, sizeof(reply) );
 284
 285     if (debug_level) trace_request();
 286
 287     if (req < REQ_NB_REQUESTS)
 288         req_handlers[req]( &current->req, &reply );
 289     else
 290         set_error( STATUS_NOT_IMPLEMENTED );
 291
 292     if (current)
 293     {
 294         if (current->reply_fd)
 295         {
 296             reply.reply_header.error = current->error;
 297             reply.reply_header.reply_size = current->reply_size;
 298             if (debug_level) trace_reply( req, &reply );
 299             send_reply( &reply );
 300         }
 301         else
 302         {
 303             current->exit_code = 1;
 304             kill_thread( current, 1 );  /* no way to continue without reply fd */
 305         }
 306     }
 307     current = NULL;
 308 }
 309
 310 /* read a request from a thread */
 311 void read_request( struct thread *thread )
 312 {
 313     int ret;
 314
 315     if (!thread->req_toread)  /* no pending request */
 316     {
 317         ret = read( get_unix_fd( thread->request_fd ), &thread->req, sizeof(thread->req) );
 318         if (sizeof(thread->req) == REQ_SIZE_64 && ret == REQ_SIZE_32)
 319         {
 320             /* Uh oh, we received a partial read, not an error per se, if
 321              * we were connecting a 32-bit client to a 64-bit server
 322              */
 323             if (thread->req.request_header.req == REQ_init_thread &&
 324                 thread->req.init_thread_request.pointer_bytes != sizeof(void *))
 325             {
 326                 /* Do nothing, this is a 32-bits client */
 327             }
 328             else
 329                 goto error;
 330         }
 331         if (!(thread->req_toread = thread->req.request_header.request_size))
 332         {
 333             /* no data, handle request at once */
 334             call_req_handler( thread );
 335             return;
 336         }
 337         if (!(thread->req_data = malloc( thread->req_toread )))
 338         {
 339             fatal_protocol_error( thread, "no memory for %u bytes request %d\n",
 340                                   thread->req_toread, thread->req.request_header.req );
 341             return;
 342         }
 343     }
 344
 345     /* read the variable sized data */
 346     for (;;)
 347     {
 348         ret = read( get_unix_fd( thread->request_fd ),
 349                     (char *)thread->req_data + thread->req.request_header.request_size
 350                       - thread->req_toread,
 351                     thread->req_toread );
 352         if (ret <= 0) break;
 353         if (!(thread->req_toread -= ret))
 354         {
 355             call_req_handler( thread );
 356             free( thread->req_data );
 357             thread->req_data = NULL;
 358             return;
 359         }
 360     }
 361
 362 error:
 363     if (!ret)  /* closed pipe */
 364         kill_thread( thread, 0 );
 365     else if (ret > 0)
 366         fatal_protocol_error( thread, "partial read %d\n", ret );
 367     else if (errno != EWOULDBLOCK && errno != EAGAIN)
 368         fatal_protocol_perror( thread, "read" );
 369 }
 370
 371 /* receive a file descriptor on the process socket */
 372 int receive_fd( struct process *process )
 373 {
 374     struct send_fd data;
 375     int fd, ret;
 376
 377 #ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 378     msghdr.msg_accrightslen = sizeof(int);
 379     msghdr.msg_accrights = (void *)&fd;
 380 #else  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 381     msghdr.msg_control    = &cmsg;
 382     msghdr.msg_controllen = sizeof(cmsg.header) + sizeof(fd);
 383     cmsg.fd = -1;
 384 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 385
 386     myiovec.iov_base = (void *)&data;
 387     myiovec.iov_len  = sizeof(data);
 388
 389     ret = recvmsg( get_unix_fd( process->msg_fd ), &msghdr, 0 );
 390 #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 391     fd = cmsg.fd;
 392 #endif
 393
 394     if (ret == sizeof(data))
 395     {
 396         struct thread *thread;
 397
 398         if (data.tid) thread = get_thread_from_id( data.tid );
 399         else thread = (struct thread *)grab_object( get_process_first_thread( process ));
 400
 401         if (!thread || thread->process != process || thread->state == TERMINATED)
 402         {
 403             if (debug_level)
 404                 fprintf( stderr, "%04x: *fd* %d <- %d bad thread id\n",
 405                          data.tid, data.fd, fd );
 406             close( fd );
 407         }
 408         else
 409         {
 410             if (debug_level)
 411                 fprintf( stderr, "%04x: *fd* %d <- %d\n",
 412                          thread->id, data.fd, fd );
 413             thread_add_inflight_fd( thread, data.fd, fd );
 414         }
 415         if (thread) release_object( thread );
 416         return 0;
 417     }
 418
 419     if (!ret)
 420     {
 421         kill_process( process, 0 );
 422     }
 423     else if (ret > 0)
 424     {
 425         fprintf( stderr, "Protocol error: process %04x: partial recvmsg %d for fd\n",
 426                  process->id, ret );
 427         kill_process( process, 1 );
 428     }
 429     else
 430     {
 431         if (errno != EWOULDBLOCK && errno != EAGAIN)
 432         {
 433             fprintf( stderr, "Protocol error: process %04x: ", process->id );
 434             perror( "recvmsg" );
 435             kill_process( process, 1 );
 436         }
 437     }
 438     return -1;
 439 }
 440
 441 /* send an fd to a client */
 442 int send_client_fd( struct process *process, int fd, obj_handle_t handle )
 443 {
 444     int ret;
 445
 446     if (debug_level)
 447         fprintf( stderr, "%04x: *fd* %04x -> %d\n",
 448                  current ? current->id : process->id, handle, fd );
 449
 450 #ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 451     msghdr.msg_accrightslen = sizeof(fd);
 452     msghdr.msg_accrights = (void *)&fd;
 453 #else  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 454     msghdr.msg_control    = &cmsg;
 455     msghdr.msg_controllen = sizeof(cmsg.header) + sizeof(fd);
 456     cmsg.fd = fd;
 457 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 458
 459     myiovec.iov_base = (void *)&handle;
 460     myiovec.iov_len  = sizeof(handle);
 461
 462     ret = sendmsg( get_unix_fd( process->msg_fd ), &msghdr, 0 );
 463
 464     if (ret == sizeof(handle)) return 0;
 465
 466     if (ret >= 0)
 467     {
 468         fprintf( stderr, "Protocol error: process %04x: partial sendmsg %d\n", process->id, ret );
 469         kill_process( process, 1 );
 470     }
 471     else if (errno == EPIPE)
 472     {
 473         kill_process( process, 0 );
 474     }
 475     else
 476     {
 477         fprintf( stderr, "Protocol error: process %04x: ", process->id );
 478         perror( "sendmsg" );
 479         kill_process( process, 1 );
 480     }
 481     return -1;
 482 }
 483
 484 /* get current tick count to return to client */
 485 unsigned int get_tick_count(void)
 486 {
 487     return (current_time - server_start_time) / 10000;
 488 }
 489
 490 static void master_socket_dump( struct object *obj, int verbose )
 491 {
 492     struct master_socket *sock = (struct master_socket *)obj;
 493     assert( obj->ops == &master_socket_ops );
 494     fprintf( stderr, "Master socket fd=%p\n", sock->fd );
 495 }
 496
 497 static void master_socket_destroy( struct object *obj )
 498 {
 499     struct master_socket *sock = (struct master_socket *)obj;
 500     assert( obj->ops == &master_socket_ops );
 501     release_object( sock->fd );
 502 }
 503
 504 /* handle a socket event */
 505 static void master_socket_poll_event( struct fd *fd, int event )
 506 {
 507     struct master_socket *sock = get_fd_user( fd );
 508     assert( master_socket->obj.ops == &master_socket_ops );
 509
 510     assert( sock == master_socket );  /* there is only one master socket */
 511
 512     if (event & (POLLERR | POLLHUP))
 513     {
 514         /* this is not supposed to happen */
 515         fprintf( stderr, "wineserver: Error on master socket\n" );
 516         set_fd_events( sock->fd, -1 );
 517     }
 518     else if (event & POLLIN)
 519     {
 520         struct sockaddr_un dummy;
 521         unsigned int len = sizeof(dummy);
 522         int client = accept( get_unix_fd( master_socket->fd ), (struct sockaddr *) &dummy, &len );
 523         if (client == -1) return;
 524         fcntl( client, F_SETFL, O_NONBLOCK );
 525         create_process( client, NULL, 0 );
 526     }
 527 }
 528
 529 /* remove the socket upon exit */
 530 static void socket_cleanup(void)
 531 {
 532     static int do_it_once;
 533     if (!do_it_once++) unlink( server_socket_name );
 534 }
 535
 536 /* create a directory and check its permissions */
 537 static void create_dir( const char *name, struct stat *st )
 538 {
 539     if (lstat( name, st ) == -1)
 540     {
 541         if (errno != ENOENT) fatal_perror( "lstat %s", name );
 542         if (mkdir( name, 0700 ) == -1 && errno != EEXIST) fatal_perror( "mkdir %s", name );
 543         if (lstat( name, st ) == -1) fatal_perror( "lstat %s", name );
 544     }
 545     if (!S_ISDIR(st->st_mode)) fatal_error( "%s is not a directory\n", name );
 546     if (st->st_uid != getuid()) fatal_error( "%s is not owned by you\n", name );
 547     if (st->st_mode & 077) fatal_error( "%s must not be accessible by other users\n", name );
 548 }
 549
 550 /* create the server directory and chdir to it */
 551 static void create_server_dir( const char *dir )
 552 {
 553     char *p, *server_dir;
 554     struct stat st, st2;
 555
 556     if (!(server_dir = strdup( dir ))) fatal_error( "out of memory\n" );
 557
 558     /* first create the base directory if needed */
 559
 560     p = strrchr( server_dir, '/' );
 561     *p = 0;
 562     create_dir( server_dir, &st );
 563
 564     /* now create the server directory */
 565
 566     *p = '/';
 567     create_dir( server_dir, &st );
 568
 569     if (chdir( server_dir ) == -1) fatal_perror( "chdir %s", server_dir );
 570     if ((server_dir_fd = open( ".", O_RDONLY )) == -1) fatal_perror( "open %s", server_dir );
 571     if (fstat( server_dir_fd, &st2 ) == -1) fatal_perror( "stat %s", server_dir );
 572     if (st.st_dev != st2.st_dev || st.st_ino != st2.st_ino)
 573         fatal_error( "chdir did not end up in %s\n", server_dir );
 574
 575     free( server_dir );
 576 }
 577
 578 /* create the lock file and return its file descriptor */
 579 static int create_server_lock(void)
 580 {
 581     struct stat st;
 582     int fd;
 583
 584     if (lstat( server_lock_name, &st ) == -1)
 585     {
 586         if (errno != ENOENT)
 587             fatal_perror( "lstat %s/%s", wine_get_server_dir(), server_lock_name );
 588     }
 589     else
 590     {
 591         if (!S_ISREG(st.st_mode))
 592             fatal_error( "%s/%s is not a regular file\n", wine_get_server_dir(), server_lock_name );
 593     }
 594
 595     if ((fd = open( server_lock_name, O_CREAT|O_TRUNC|O_WRONLY, 0600 )) == -1)
 596         fatal_perror( "error creating %s/%s", wine_get_server_dir(), server_lock_name );
 597     return fd;
 598 }
 599
 600 /* wait for the server lock */
 601 int wait_for_lock(void)
 602 {
 603     const char *server_dir = wine_get_server_dir();
 604     int fd, r;
 605     struct flock fl;
 606
 607     if (!server_dir) return 0;  /* no server dir, so no lock to wait on */
 608
 609     create_server_dir( server_dir );
 610     fd = create_server_lock();
 611
 612     fl.l_type   = F_WRLCK;
 613     fl.l_whence = SEEK_SET;
 614     fl.l_start  = 0;
 615     fl.l_len    = 1;
 616     r = fcntl( fd, F_SETLKW, &fl );
 617     close(fd);
 618
 619     return r;
 620 }
 621
 622 /* kill the wine server holding the lock */
 623 int kill_lock_owner( int sig )
 624 {
 625     const char *server_dir = wine_get_server_dir();
 626     int fd, i, ret = 0;
 627     pid_t pid = 0;
 628     struct flock fl;
 629
 630     if (!server_dir) return 0;  /* no server dir, nothing to do */
 631
 632     create_server_dir( server_dir );
 633     fd = create_server_lock();
 634
 635     for (i = 1; i <= 20; i++)
 636     {
 637         fl.l_type   = F_WRLCK;
 638         fl.l_whence = SEEK_SET;
 639         fl.l_start  = 0;
 640         fl.l_len    = 1;
 641         if (fcntl( fd, F_GETLK, &fl ) == -1) goto done;
 642         if (fl.l_type != F_WRLCK) goto done;  /* the file is not locked */
 643         if (!pid)  /* first time around */
 644         {
 645             if (!(pid = fl.l_pid)) goto done;  /* shouldn't happen */
 646             if (sig == -1)
 647             {
 648                 if (kill( pid, SIGINT ) == -1) goto done;
 649                 kill( pid, SIGCONT );
 650                 ret = 1;
 651             }
 652             else  /* just send the specified signal and return */
 653             {
 654                 ret = (kill( pid, sig ) != -1);
 655                 goto done;
 656             }
 657         }
 658         else if (fl.l_pid != pid) goto done;  /* no longer the same process */
 659         usleep( 50000 * i );
 660     }
 661     /* waited long enough, now kill it */
 662     kill( pid, SIGKILL );
 663
 664  done:
 665     close( fd );
 666     return ret;
 667 }
 668
 669 /* acquire the main server lock */
 670 static void acquire_lock(void)
 671 {
 672     struct sockaddr_un addr;
 673     struct stat st;
 674     struct flock fl;
 675     int fd, slen, got_lock = 0;
 676
 677     fd = create_server_lock();
 678
 679     fl.l_type   = F_WRLCK;
 680     fl.l_whence = SEEK_SET;
 681     fl.l_start  = 0;
 682     fl.l_len    = 1;
 683     if (fcntl( fd, F_SETLK, &fl ) != -1)
 684     {
 685         /* check for crashed server */
 686         if (stat( server_socket_name, &st ) != -1 &&   /* there is a leftover socket */
 687             stat( "core", &st ) != -1 && st.st_size)   /* and there is a non-empty core file */
 688         {
 689             fprintf( stderr,
 690                      "Warning: a previous instance of the wine server seems to have crashed.\n"
 691                      "Please run 'gdb %s %s/core',\n"
 692                      "type 'backtrace' at the gdb prompt and report the results. Thanks.\n\n",
 693                      server_argv0, wine_get_server_dir() );
 694         }
 695         unlink( server_socket_name ); /* we got the lock, we can safely remove the socket */
 696         got_lock = 1;
 697         /* in that case we reuse fd without closing it, this ensures
 698          * that we hold the lock until the process exits */
 699     }
 700     else
 701     {
 702         switch(errno)
 703         {
 704         case ENOLCK:
 705             break;
 706         case EACCES:
 707             /* check whether locks work at all on this file system */
 708             if (fcntl( fd, F_GETLK, &fl ) == -1) break;
 709             /* fall through */
 710         case EAGAIN:
 711             exit(2); /* we didn't get the lock, exit with special status */
 712         default:
 713             fatal_perror( "fcntl %s/%s", wine_get_server_dir(), server_lock_name );
 714         }
 715         /* it seems we can't use locks on this fs, so we will use the socket existence as lock */
 716         close( fd );
 717     }
 718
 719     if ((fd = socket( AF_UNIX, SOCK_STREAM, 0 )) == -1) fatal_perror( "socket" );
 720     addr.sun_family = AF_UNIX;
 721     strcpy( addr.sun_path, server_socket_name );
 722     slen = sizeof(addr) - sizeof(addr.sun_path) + strlen(addr.sun_path) + 1;
 723 #ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN
 724     addr.sun_len = slen;
 725 #endif
 726     if (bind( fd, (struct sockaddr *)&addr, slen ) == -1)
 727     {
 728         if ((errno == EEXIST) || (errno == EADDRINUSE))
 729         {
 730             if (got_lock)
 731                 fatal_error( "couldn't bind to the socket even though we hold the lock\n" );
 732             exit(2); /* we didn't get the lock, exit with special status */
 733         }
 734         fatal_perror( "bind" );
 735     }
 736     atexit( socket_cleanup );
 737     chmod( server_socket_name, 0600 );  /* make sure no other user can connect */
 738     if (listen( fd, 5 ) == -1) fatal_perror( "listen" );
 739
 740     if (!(master_socket = alloc_object( &master_socket_ops )) ||
 741         !(master_socket->fd = create_anonymous_fd( &master_socket_fd_ops, fd, &master_socket->obj, 0 )))
 742         fatal_error( "out of memory\n" );
 743     set_fd_events( master_socket->fd, POLLIN );
 744     make_object_static( &master_socket->obj );
 745 }
 746
 747 /* open the master server socket and start waiting for new clients */
 748 void open_master_socket(void)
 749 {
 750     const char *server_dir = wine_get_server_dir();
 751     const char *config_dir = wine_get_config_dir();
 752     int fd, pid, status, sync_pipe[2];
 753     char dummy;
 754
 755     /* make sure no request is larger than the maximum size */
 756     assert( sizeof(union generic_request) == sizeof(struct request_max_size) );
 757     assert( sizeof(union generic_reply) == sizeof(struct request_max_size) );
 758
 759     /* Make sure REQ_SIZE_32 and REQ_SIZE_64 are of correct size */
 760     if (sizeof(void *) == sizeof(int))
 761         assert(sizeof(struct request_max_size) == REQ_SIZE_32);
 762     else if (sizeof(void *) == sizeof(__int64))
 763         assert(sizeof(struct request_max_size) == REQ_SIZE_64);
 764     else
 765         assert(0);
 766
 767     if (!server_dir) fatal_error( "directory %s cannot be accessed\n", config_dir );
 768     if (chdir( config_dir ) == -1) fatal_perror( "chdir to %s", config_dir );
 769     if ((config_dir_fd = open( ".", O_RDONLY )) == -1) fatal_perror( "open %s", config_dir );
 770
 771     create_server_dir( server_dir );
 772
 773     if (!foreground)
 774     {
 775         if (pipe( sync_pipe ) == -1) fatal_perror( "pipe" );
 776         pid = fork();
 777         switch( pid )
 778         {
 779         case 0:  /* child */
 780             setsid();
 781             close( sync_pipe[0] );
 782
 783             acquire_lock();
 784
 785             /* close stdin and stdout */
 786             if ((fd = open( "/dev/null", O_RDWR )) != -1)
 787             {
 788                 dup2( fd, 0 );
 789                 dup2( fd, 1 );
 790                 close( fd );
 791             }
 792
 793             /* signal parent */
 794             dummy = 0;
 795             write( sync_pipe[1], &dummy, 1 );
 796             close( sync_pipe[1] );
 797             break;
 798
 799         case -1:
 800             fatal_perror( "fork" );
 801             break;
 802
 803         default:  /* parent */
 804             close( sync_pipe[1] );
 805
 806             /* wait for child to signal us and then exit */
 807             if (read( sync_pipe[0], &dummy, 1 ) == 1) _exit(0);
 808
 809             /* child terminated, propagate exit status */
 810             wait4( pid, &status, 0, NULL );
 811             if (WIFEXITED(status)) _exit( WEXITSTATUS(status) );
 812             _exit(1);
 813         }
 814     }
 815     else  /* remain in the foreground */
 816     {
 817         acquire_lock();
 818     }
 819
 820     /* setup msghdr structure constant fields */
 821     msghdr.msg_name    = NULL;
 822     msghdr.msg_namelen = 0;
 823     msghdr.msg_iov     = &myiovec;
 824     msghdr.msg_iovlen  = 1;
 825
 826     /* init the process tracing mechanism */
 827     init_tracing_mechanism();
 828 }
 829
 830 /* master socket timer expiration handler */
 831 static void close_socket_timeout( void *arg )
 832 {
 833     master_timeout = NULL;
 834     flush_registry();
 835     if (debug_level) fprintf( stderr, "wineserver: exiting (pid=%ld)\n", (long) getpid() );
 836
 837 #ifdef DEBUG_OBJECTS
 838     close_objects();  /* shut down everything properly */
 839 #endif
 840     exit( 0 );
 841 }
 842
 843 /* close the master socket and stop waiting for new clients */
 844 void close_master_socket( timeout_t timeout )
 845 {
 846     if (master_socket)
 847     {
 848         release_object( master_socket );
 849         master_socket = NULL;
 850     }
 851     if (master_timeout)  /* cancel previous timeout */
 852         remove_timeout_user( master_timeout );
 853
 854     master_timeout = add_timeout_user( timeout, close_socket_timeout, NULL );
 855 }