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_get_type,                   /* get_type */
  93     no_add_queue,                  /* add_queue */
  94     NULL,                          /* remove_queue */
  95     NULL,                          /* signaled */
  96     NULL,                          /* satisfied */
  97     no_signal,                     /* signal */
  98     no_get_fd,                     /* get_fd */
  99     no_map_access,                 /* map_access */
 100     default_get_sd,                /* get_sd */
 101     default_set_sd,                /* set_sd */
 102     no_lookup_name,                /* lookup_name */
 103     no_open_file,                  /* open_file */
 104     no_close_handle,               /* close_handle */
 105     master_socket_destroy          /* destroy */
 106 };
 107
 108 static const struct fd_ops master_socket_fd_ops =
 109 {
 110     NULL,                          /* get_poll_events */
 111     master_socket_poll_event,      /* poll_event */
 112     NULL,                          /* flush */
 113     NULL,                          /* get_fd_type */
 114     NULL,                          /* ioctl */
 115     NULL,                          /* queue_async */
 116     NULL,                          /* reselect_async */
 117     NULL                           /* cancel_async */
 118 };
 119
 120
 121 struct thread *current = NULL;  /* thread handling the current request */
 122 unsigned int global_error = 0;  /* global error code for when no thread is current */
 123 timeout_t server_start_time = 0;  /* server startup time */
 124
 125 static struct master_socket *master_socket;  /* the master socket object */
 126 static int force_shutdown;
 127
 128 /* socket communication static structures */
 129 static struct iovec myiovec;
 130 static struct msghdr msghdr;
 131 #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 132 struct cmsg_fd
 133 {
 134     struct
 135     {
 136         size_t len;   /* size of structure */
 137         int    level; /* SOL_SOCKET */
 138         int    type;  /* SCM_RIGHTS */
 139     } header;
 140     int fd;           /* fd to pass */
 141 };
 142 static struct cmsg_fd cmsg = { { sizeof(cmsg.header) + sizeof(cmsg.fd), SOL_SOCKET, SCM_RIGHTS }, -1 };
 143 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 144
 145 /* complain about a protocol error and terminate the client connection */
 146 void fatal_protocol_error( struct thread *thread, const char *err, ... )
 147 {
 148     va_list args;
 149
 150     va_start( args, err );
 151     fprintf( stderr, "Protocol error:%04x: ", thread->id );
 152     vfprintf( stderr, err, args );
 153     va_end( args );
 154     thread->exit_code = 1;
 155     kill_thread( thread, 1 );
 156 }
 157
 158 /* complain about a protocol error and terminate the client connection */
 159 void fatal_protocol_perror( struct thread *thread, const char *err, ... )
 160 {
 161     va_list args;
 162
 163     va_start( args, err );
 164     fprintf( stderr, "Protocol error:%04x: ", thread->id );
 165     vfprintf( stderr, err, args );
 166     perror( " " );
 167     va_end( args );
 168     thread->exit_code = 1;
 169     kill_thread( thread, 1 );
 170 }
 171
 172 /* die on a fatal error */
 173 void fatal_error( const char *err, ... )
 174 {
 175     va_list args;
 176
 177     va_start( args, err );
 178     fprintf( stderr, "wineserver: " );
 179     vfprintf( stderr, err, args );
 180     va_end( args );
 181     exit(1);
 182 }
 183
 184 /* die on a fatal error */
 185 void fatal_perror( const char *err, ... )
 186 {
 187     va_list args;
 188
 189     va_start( args, err );
 190     fprintf( stderr, "wineserver: " );
 191     vfprintf( stderr, err, args );
 192     perror( " " );
 193     va_end( args );
 194     exit(1);
 195 }
 196
 197 /* allocate the reply data */
 198 void *set_reply_data_size( data_size_t size )
 199 {
 200     assert( size <= get_reply_max_size() );
 201     if (size && !(current->reply_data = mem_alloc( size ))) size = 0;
 202     current->reply_size = size;
 203     return current->reply_data;
 204 }
 205
 206 /* write the remaining part of the reply */
 207 void write_reply( struct thread *thread )
 208 {
 209     int ret;
 210
 211     if ((ret = write( get_unix_fd( thread->reply_fd ),
 212                       (char *)thread->reply_data + thread->reply_size - thread->reply_towrite,
 213                       thread->reply_towrite )) >= 0)
 214     {
 215         if (!(thread->reply_towrite -= ret))
 216         {
 217             free( thread->reply_data );
 218             thread->reply_data = NULL;
 219             /* sent everything, can go back to waiting for requests */
 220             set_fd_events( thread->request_fd, POLLIN );
 221             set_fd_events( thread->reply_fd, 0 );
 222         }
 223         return;
 224     }
 225     if (errno == EPIPE)
 226         kill_thread( thread, 0 );  /* normal death */
 227     else if (errno != EWOULDBLOCK && errno != EAGAIN)
 228         fatal_protocol_perror( thread, "reply write" );
 229 }
 230
 231 /* send a reply to the current thread */
 232 static void send_reply( union generic_reply *reply )
 233 {
 234     int ret;
 235
 236     if (!current->reply_size)
 237     {
 238         if ((ret = write( get_unix_fd( current->reply_fd ),
 239                           reply, sizeof(*reply) )) != sizeof(*reply)) goto error;
 240     }
 241     else
 242     {
 243         struct iovec vec[2];
 244
 245         vec[0].iov_base = (void *)reply;
 246         vec[0].iov_len  = sizeof(*reply);
 247         vec[1].iov_base = current->reply_data;
 248         vec[1].iov_len  = current->reply_size;
 249
 250         if ((ret = writev( get_unix_fd( current->reply_fd ), vec, 2 )) < sizeof(*reply)) goto error;
 251
 252         if ((current->reply_towrite = current->reply_size - (ret - sizeof(*reply))))
 253         {
 254             /* couldn't write it all, wait for POLLOUT */
 255             set_fd_events( current->reply_fd, POLLOUT );
 256             set_fd_events( current->request_fd, 0 );
 257             return;
 258         }
 259     }
 260     free( current->reply_data );
 261     current->reply_data = NULL;
 262     return;
 263
 264  error:
 265     if (ret >= 0)
 266         fatal_protocol_error( current, "partial write %d\n", ret );
 267     else if (errno == EPIPE)
 268         kill_thread( current, 0 );  /* normal death */
 269     else
 270         fatal_protocol_perror( current, "reply write" );
 271 }
 272
 273 /* call a request handler */
 274 static void call_req_handler( struct thread *thread )
 275 {
 276     union generic_reply reply;
 277     enum request req = thread->req.request_header.req;
 278
 279     current = thread;
 280     current->reply_size = 0;
 281     clear_error();
 282     memset( &reply, 0, sizeof(reply) );
 283
 284     if (debug_level) trace_request();
 285
 286     if (req < REQ_NB_REQUESTS)
 287         req_handlers[req]( &current->req, &reply );
 288     else
 289         set_error( STATUS_NOT_IMPLEMENTED );
 290
 291     if (current)
 292     {
 293         if (current->reply_fd)
 294         {
 295             reply.reply_header.error = current->error;
 296             reply.reply_header.reply_size = current->reply_size;
 297             if (debug_level) trace_reply( req, &reply );
 298             send_reply( &reply );
 299         }
 300         else
 301         {
 302             current->exit_code = 1;
 303             kill_thread( current, 1 );  /* no way to continue without reply fd */
 304         }
 305     }
 306     current = NULL;
 307 }
 308
 309 /* read a request from a thread */
 310 void read_request( struct thread *thread )
 311 {
 312     int ret;
 313
 314     if (!thread->req_toread)  /* no pending request */
 315     {
 316         if ((ret = read( get_unix_fd( thread->request_fd ), &thread->req,
 317                          sizeof(thread->req) )) != sizeof(thread->req)) goto error;
 318         if (!(thread->req_toread = thread->req.request_header.request_size))
 319         {
 320             /* no data, handle request at once */
 321             call_req_handler( thread );
 322             return;
 323         }
 324         if (!(thread->req_data = malloc( thread->req_toread )))
 325         {
 326             fatal_protocol_error( thread, "no memory for %u bytes request %d\n",
 327                                   thread->req_toread, thread->req.request_header.req );
 328             return;
 329         }
 330     }
 331
 332     /* read the variable sized data */
 333     for (;;)
 334     {
 335         ret = read( get_unix_fd( thread->request_fd ),
 336                     (char *)thread->req_data + thread->req.request_header.request_size
 337                       - thread->req_toread,
 338                     thread->req_toread );
 339         if (ret <= 0) break;
 340         if (!(thread->req_toread -= ret))
 341         {
 342             call_req_handler( thread );
 343             free( thread->req_data );
 344             thread->req_data = NULL;
 345             return;
 346         }
 347     }
 348
 349 error:
 350     if (!ret)  /* closed pipe */
 351         kill_thread( thread, 0 );
 352     else if (ret > 0)
 353         fatal_protocol_error( thread, "partial read %d\n", ret );
 354     else if (errno != EWOULDBLOCK && errno != EAGAIN)
 355         fatal_protocol_perror( thread, "read" );
 356 }
 357
 358 /* receive a file descriptor on the process socket */
 359 int receive_fd( struct process *process )
 360 {
 361     struct send_fd data;
 362     int fd, ret;
 363
 364 #ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 365     msghdr.msg_accrightslen = sizeof(int);
 366     msghdr.msg_accrights = (void *)&fd;
 367 #else  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 368     msghdr.msg_control    = &cmsg;
 369     msghdr.msg_controllen = sizeof(cmsg.header) + sizeof(fd);
 370     cmsg.fd = -1;
 371 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 372
 373     myiovec.iov_base = (void *)&data;
 374     myiovec.iov_len  = sizeof(data);
 375
 376     ret = recvmsg( get_unix_fd( process->msg_fd ), &msghdr, 0 );
 377 #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 378     fd = cmsg.fd;
 379 #endif
 380
 381     if (ret == sizeof(data))
 382     {
 383         struct thread *thread;
 384
 385         if (data.tid) thread = get_thread_from_id( data.tid );
 386         else thread = (struct thread *)grab_object( get_process_first_thread( process ));
 387
 388         if (!thread || thread->process != process || thread->state == TERMINATED)
 389         {
 390             if (debug_level)
 391                 fprintf( stderr, "%04x: *fd* %d <- %d bad thread id\n",
 392                          data.tid, data.fd, fd );
 393             close( fd );
 394         }
 395         else
 396         {
 397             if (debug_level)
 398                 fprintf( stderr, "%04x: *fd* %d <- %d\n",
 399                          thread->id, data.fd, fd );
 400             thread_add_inflight_fd( thread, data.fd, fd );
 401         }
 402         if (thread) release_object( thread );
 403         return 0;
 404     }
 405
 406     if (!ret)
 407     {
 408         kill_process( process, 0 );
 409     }
 410     else if (ret > 0)
 411     {
 412         fprintf( stderr, "Protocol error: process %04x: partial recvmsg %d for fd\n",
 413                  process->id, ret );
 414         kill_process( process, 1 );
 415     }
 416     else
 417     {
 418         if (errno != EWOULDBLOCK && errno != EAGAIN)
 419         {
 420             fprintf( stderr, "Protocol error: process %04x: ", process->id );
 421             perror( "recvmsg" );
 422             kill_process( process, 1 );
 423         }
 424     }
 425     return -1;
 426 }
 427
 428 /* send an fd to a client */
 429 int send_client_fd( struct process *process, int fd, obj_handle_t handle )
 430 {
 431     int ret;
 432
 433     if (debug_level)
 434         fprintf( stderr, "%04x: *fd* %p -> %d\n",
 435                  current ? current->id : process->id, handle, fd );
 436
 437 #ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 438     msghdr.msg_accrightslen = sizeof(fd);
 439     msghdr.msg_accrights = (void *)&fd;
 440 #else  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 441     msghdr.msg_control    = &cmsg;
 442     msghdr.msg_controllen = sizeof(cmsg.header) + sizeof(fd);
 443     cmsg.fd = fd;
 444 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 445
 446     myiovec.iov_base = (void *)&handle;
 447     myiovec.iov_len  = sizeof(handle);
 448
 449     ret = sendmsg( get_unix_fd( process->msg_fd ), &msghdr, 0 );
 450
 451     if (ret == sizeof(handle)) return 0;
 452
 453     if (ret >= 0)
 454     {
 455         fprintf( stderr, "Protocol error: process %04x: partial sendmsg %d\n", process->id, ret );
 456         kill_process( process, 1 );
 457     }
 458     else if (errno == EPIPE)
 459     {
 460         kill_process( process, 0 );
 461     }
 462     else
 463     {
 464         fprintf( stderr, "Protocol error: process %04x: ", process->id );
 465         perror( "sendmsg" );
 466         kill_process( process, 1 );
 467     }
 468     return -1;
 469 }
 470
 471 /* get current tick count to return to client */
 472 unsigned int get_tick_count(void)
 473 {
 474     return (current_time - server_start_time) / 10000;
 475 }
 476
 477 static void master_socket_dump( struct object *obj, int verbose )
 478 {
 479     struct master_socket *sock = (struct master_socket *)obj;
 480     assert( obj->ops == &master_socket_ops );
 481     fprintf( stderr, "Master socket fd=%p\n", sock->fd );
 482 }
 483
 484 static void master_socket_destroy( struct object *obj )
 485 {
 486     struct master_socket *sock = (struct master_socket *)obj;
 487     assert( obj->ops == &master_socket_ops );
 488     release_object( sock->fd );
 489 }
 490
 491 /* handle a socket event */
 492 static void master_socket_poll_event( struct fd *fd, int event )
 493 {
 494     struct master_socket *sock = get_fd_user( fd );
 495     assert( master_socket->obj.ops == &master_socket_ops );
 496
 497     assert( sock == master_socket );  /* there is only one master socket */
 498
 499     if (event & (POLLERR | POLLHUP))
 500     {
 501         /* this is not supposed to happen */
 502         fprintf( stderr, "wineserver: Error on master socket\n" );
 503         set_fd_events( sock->fd, -1 );
 504     }
 505     else if (event & POLLIN)
 506     {
 507         struct sockaddr_un dummy;
 508         unsigned int len = sizeof(dummy);
 509         int client = accept( get_unix_fd( master_socket->fd ), (struct sockaddr *) &dummy, &len );
 510         if (client == -1) return;
 511         if (sock->timeout)
 512         {
 513             remove_timeout_user( sock->timeout );
 514             sock->timeout = NULL;
 515         }
 516         fcntl( client, F_SETFL, O_NONBLOCK );
 517         create_process( client, NULL, 0 );
 518     }
 519 }
 520
 521 /* remove the socket upon exit */
 522 static void socket_cleanup(void)
 523 {
 524     static int do_it_once;
 525     if (!do_it_once++) unlink( server_socket_name );
 526 }
 527
 528 /* create a directory and check its permissions */
 529 static void create_dir( const char *name, struct stat *st )
 530 {
 531     if (lstat( name, st ) == -1)
 532     {
 533         if (errno != ENOENT) fatal_perror( "lstat %s", name );
 534         if (mkdir( name, 0700 ) == -1 && errno != EEXIST) fatal_perror( "mkdir %s", name );
 535         if (lstat( name, st ) == -1) fatal_perror( "lstat %s", name );
 536     }
 537     if (!S_ISDIR(st->st_mode)) fatal_error( "%s is not a directory\n", name );
 538     if (st->st_uid != getuid()) fatal_error( "%s is not owned by you\n", name );
 539     if (st->st_mode & 077) fatal_error( "%s must not be accessible by other users\n", name );
 540 }
 541
 542 /* create the server directory and chdir to it */
 543 static void create_server_dir( const char *dir )
 544 {
 545     char *p, *server_dir;
 546     struct stat st, st2;
 547
 548     if (!(server_dir = strdup( dir ))) fatal_error( "out of memory\n" );
 549
 550     /* first create the base directory if needed */
 551
 552     p = strrchr( server_dir, '/' );
 553     *p = 0;
 554     create_dir( server_dir, &st );
 555
 556     /* now create the server directory */
 557
 558     *p = '/';
 559     create_dir( server_dir, &st );
 560
 561     if (chdir( server_dir ) == -1) fatal_perror( "chdir %s", server_dir );
 562     if (stat( ".", &st2 ) == -1) fatal_perror( "stat %s", server_dir );
 563     if (st.st_dev != st2.st_dev || st.st_ino != st2.st_ino)
 564         fatal_error( "chdir did not end up in %s\n", server_dir );
 565
 566     free( server_dir );
 567 }
 568
 569 /* create the lock file and return its file descriptor */
 570 static int create_server_lock(void)
 571 {
 572     struct stat st;
 573     int fd;
 574
 575     if (lstat( server_lock_name, &st ) == -1)
 576     {
 577         if (errno != ENOENT)
 578             fatal_perror( "lstat %s/%s", wine_get_server_dir(), server_lock_name );
 579     }
 580     else
 581     {
 582         if (!S_ISREG(st.st_mode))
 583             fatal_error( "%s/%s is not a regular file\n", wine_get_server_dir(), server_lock_name );
 584     }
 585
 586     if ((fd = open( server_lock_name, O_CREAT|O_TRUNC|O_WRONLY, 0600 )) == -1)
 587         fatal_perror( "error creating %s/%s", wine_get_server_dir(), server_lock_name );
 588     return fd;
 589 }
 590
 591 /* wait for the server lock */
 592 int wait_for_lock(void)
 593 {
 594     const char *server_dir = wine_get_server_dir();
 595     int fd, r;
 596     struct flock fl;
 597
 598     if (!server_dir) return 0;  /* no server dir, so no lock to wait on */
 599
 600     create_server_dir( server_dir );
 601     fd = create_server_lock();
 602
 603     fl.l_type   = F_WRLCK;
 604     fl.l_whence = SEEK_SET;
 605     fl.l_start  = 0;
 606     fl.l_len    = 1;
 607     r = fcntl( fd, F_SETLKW, &fl );
 608     close(fd);
 609
 610     return r;
 611 }
 612
 613 /* kill the wine server holding the lock */
 614 int kill_lock_owner( int sig )
 615 {
 616     const char *server_dir = wine_get_server_dir();
 617     int fd, i, ret = 0;
 618     pid_t pid = 0;
 619     struct flock fl;
 620
 621     if (!server_dir) return 0;  /* no server dir, nothing to do */
 622
 623     create_server_dir( server_dir );
 624     fd = create_server_lock();
 625
 626     for (i = 0; i < 10; i++)
 627     {
 628         fl.l_type   = F_WRLCK;
 629         fl.l_whence = SEEK_SET;
 630         fl.l_start  = 0;
 631         fl.l_len    = 1;
 632         if (fcntl( fd, F_GETLK, &fl ) == -1) goto done;
 633         if (fl.l_type != F_WRLCK) goto done;  /* the file is not locked */
 634         if (!pid)  /* first time around */
 635         {
 636             if (!(pid = fl.l_pid)) goto done;  /* shouldn't happen */
 637             if (sig == -1)
 638             {
 639                 if (kill( pid, SIGINT ) == -1) goto done;
 640                 kill( pid, SIGCONT );
 641                 ret = 1;
 642             }
 643             else  /* just send the specified signal and return */
 644             {
 645                 ret = (kill( pid, sig ) != -1);
 646                 goto done;
 647             }
 648         }
 649         else if (fl.l_pid != pid) goto done;  /* no longer the same process */
 650         sleep( 1 );
 651     }
 652     /* waited long enough, now kill it */
 653     kill( pid, SIGKILL );
 654
 655  done:
 656     close( fd );
 657     return ret;
 658 }
 659
 660 /* acquire the main server lock */
 661 static void acquire_lock(void)
 662 {
 663     struct sockaddr_un addr;
 664     struct stat st;
 665     struct flock fl;
 666     int fd, slen, got_lock = 0;
 667
 668     fd = create_server_lock();
 669
 670     fl.l_type   = F_WRLCK;
 671     fl.l_whence = SEEK_SET;
 672     fl.l_start  = 0;
 673     fl.l_len    = 1;
 674     if (fcntl( fd, F_SETLK, &fl ) != -1)
 675     {
 676         /* check for crashed server */
 677         if (stat( server_socket_name, &st ) != -1 &&   /* there is a leftover socket */
 678             stat( "core", &st ) != -1 && st.st_size)   /* and there is a non-empty core file */
 679         {
 680             fprintf( stderr,
 681                      "Warning: a previous instance of the wine server seems to have crashed.\n"
 682                      "Please run 'gdb %s %s/core',\n"
 683                      "type 'backtrace' at the gdb prompt and report the results. Thanks.\n\n",
 684                      server_argv0, wine_get_server_dir() );
 685         }
 686         unlink( server_socket_name ); /* we got the lock, we can safely remove the socket */
 687         got_lock = 1;
 688         /* in that case we reuse fd without closing it, this ensures
 689          * that we hold the lock until the process exits */
 690     }
 691     else
 692     {
 693         switch(errno)
 694         {
 695         case ENOLCK:
 696             break;
 697         case EACCES:
 698             /* check whether locks work at all on this file system */
 699             if (fcntl( fd, F_GETLK, &fl ) == -1) break;
 700             /* fall through */
 701         case EAGAIN:
 702             exit(2); /* we didn't get the lock, exit with special status */
 703         default:
 704             fatal_perror( "fcntl %s/%s", wine_get_server_dir(), server_lock_name );
 705         }
 706         /* it seems we can't use locks on this fs, so we will use the socket existence as lock */
 707         close( fd );
 708     }
 709
 710     if ((fd = socket( AF_UNIX, SOCK_STREAM, 0 )) == -1) fatal_perror( "socket" );
 711     addr.sun_family = AF_UNIX;
 712     strcpy( addr.sun_path, server_socket_name );
 713     slen = sizeof(addr) - sizeof(addr.sun_path) + strlen(addr.sun_path) + 1;
 714 #ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN
 715     addr.sun_len = slen;
 716 #endif
 717     if (bind( fd, (struct sockaddr *)&addr, slen ) == -1)
 718     {
 719         if ((errno == EEXIST) || (errno == EADDRINUSE))
 720         {
 721             if (got_lock)
 722                 fatal_error( "couldn't bind to the socket even though we hold the lock\n" );
 723             exit(2); /* we didn't get the lock, exit with special status */
 724         }
 725         fatal_perror( "bind" );
 726     }
 727     atexit( socket_cleanup );
 728     chmod( server_socket_name, 0600 );  /* make sure no other user can connect */
 729     if (listen( fd, 5 ) == -1) fatal_perror( "listen" );
 730
 731     if (!(master_socket = alloc_object( &master_socket_ops )) ||
 732         !(master_socket->fd = create_anonymous_fd( &master_socket_fd_ops, fd, &master_socket->obj, 0 )))
 733         fatal_error( "out of memory\n" );
 734     master_socket->timeout = NULL;
 735     set_fd_events( master_socket->fd, POLLIN );
 736     make_object_static( &master_socket->obj );
 737 }
 738
 739 /* open the master server socket and start waiting for new clients */
 740 void open_master_socket(void)
 741 {
 742     const char *server_dir = wine_get_server_dir();
 743     int fd, pid, status, sync_pipe[2];
 744     char dummy;
 745
 746     /* make sure no request is larger than the maximum size */
 747     assert( sizeof(union generic_request) == sizeof(struct request_max_size) );
 748     assert( sizeof(union generic_reply) == sizeof(struct request_max_size) );
 749
 750     if (!server_dir) fatal_error( "directory %s cannot be accessed\n", wine_get_config_dir() );
 751     create_server_dir( server_dir );
 752
 753     if (!foreground)
 754     {
 755         if (pipe( sync_pipe ) == -1) fatal_perror( "pipe" );
 756         pid = fork();
 757         switch( pid )
 758         {
 759         case 0:  /* child */
 760             setsid();
 761             close( sync_pipe[0] );
 762
 763             acquire_lock();
 764
 765             /* close stdin and stdout */
 766             if ((fd = open( "/dev/null", O_RDWR )) != -1)
 767             {
 768                 dup2( fd, 0 );
 769                 dup2( fd, 1 );
 770                 close( fd );
 771             }
 772
 773             /* signal parent */
 774             dummy = 0;
 775             write( sync_pipe[1], &dummy, 1 );
 776             close( sync_pipe[1] );
 777             break;
 778
 779         case -1:
 780             fatal_perror( "fork" );
 781             break;
 782
 783         default:  /* parent */
 784             close( sync_pipe[1] );
 785
 786             /* wait for child to signal us and then exit */
 787             if (read( sync_pipe[0], &dummy, 1 ) == 1) _exit(0);
 788
 789             /* child terminated, propagate exit status */
 790             wait4( pid, &status, 0, NULL );
 791             if (WIFEXITED(status)) _exit( WEXITSTATUS(status) );
 792             _exit(1);
 793         }
 794     }
 795     else  /* remain in the foreground */
 796     {
 797         acquire_lock();
 798     }
 799
 800     /* setup msghdr structure constant fields */
 801     msghdr.msg_name    = NULL;
 802     msghdr.msg_namelen = 0;
 803     msghdr.msg_iov     = &myiovec;
 804     msghdr.msg_iovlen  = 1;
 805
 806     /* init the process tracing mechanism */
 807     init_tracing_mechanism();
 808 }
 809
 810 /* master socket timer expiration handler */
 811 static void close_socket_timeout( void *arg )
 812 {
 813     master_socket->timeout = NULL;
 814     flush_registry();
 815
 816     /* if a new client is waiting, we keep on running */
 817     if (!force_shutdown && check_fd_events( master_socket->fd, POLLIN )) return;
 818
 819     if (debug_level) fprintf( stderr, "wineserver: exiting (pid=%ld)\n", (long) getpid() );
 820
 821 #ifdef DEBUG_OBJECTS
 822     close_objects();  /* shut down everything properly */
 823 #endif
 824     exit( force_shutdown );
 825 }
 826
 827 /* close the master socket and stop waiting for new clients */
 828 void close_master_socket(void)
 829 {
 830     if (master_socket_timeout == TIMEOUT_INFINITE) return;  /* just keep running forever */
 831
 832     if (master_socket_timeout)
 833         master_socket->timeout = add_timeout_user( master_socket_timeout, close_socket_timeout, NULL );
 834     else
 835         close_socket_timeout( NULL );  /* close it right away */
 836 }
 837
 838 /* forced shutdown, used for wineserver -k */
 839 void shutdown_master_socket(void)
 840 {
 841     force_shutdown = 1;
 842     master_socket_timeout = 0;
 843     if (master_socket->timeout)
 844     {
 845         remove_timeout_user( master_socket->timeout );
 846         close_socket_timeout( NULL );
 847     }
 848     set_fd_events( master_socket->fd, -1 ); /* stop waiting for new clients */
 849 }