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