server/request.c

   1 /*
   2  * Server-side request handling
   3  *
   4  * Copyright (C) 1998 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <assert.h>
  25 #include <errno.h>
  26 #include <fcntl.h>
  27 #ifdef HAVE_PWD_H
  28 #include <pwd.h>
  29 #endif
  30 #include <signal.h>
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <stdarg.h>
  34 #include <string.h>
  35 #include <sys/stat.h>
  36 #include <sys/time.h>
  37 #include <sys/types.h>
  38 #ifdef HAVE_SYS_SOCKET_H
  39 # include <sys/socket.h>
  40 #endif
  41 #ifdef HAVE_SYS_WAIT_H
  42 # include <sys/wait.h>
  43 #endif
  44 #ifdef HAVE_SYS_UIO_H
  45 #include <sys/uio.h>
  46 #endif
  47 #ifdef HAVE_SYS_UN_H
  48 #include <sys/un.h>
  49 #endif
  50 #include <unistd.h>
  51 #ifdef HAVE_POLL_H
  52 #include <poll.h>
  53 #endif
  54
  55 #include "windef.h"
  56 #include "winbase.h"
  57 #include "wincon.h"
  58 #include "wine/library.h"
  59
  60 #include "file.h"
  61 #include "handle.h"
  62 #include "thread.h"
  63 #include "process.h"
  64 #include "user.h"
  65 #define WANT_REQUEST_HANDLERS
  66 #include "request.h"
  67
  68 /* Some versions of glibc don't define this */
  69 #ifndef SCM_RIGHTS
  70 #define SCM_RIGHTS 1
  71 #endif
  72
  73 /* path names for server master Unix socket */
  74 static const char * const server_socket_name = "socket";   /* name of the socket file */
  75 static const char * const server_lock_name = "lock";       /* name of the server lock file */
  76
  77 struct master_socket
  78 {
  79     struct object        obj;        /* object header */
  80     struct fd           *fd;         /* file descriptor of the master socket */
  81     struct timeout_user *timeout;    /* timeout on last process exit */
  82 };
  83
  84 static void master_socket_dump( struct object *obj, int verbose );
  85 static void master_socket_destroy( struct object *obj );
  86 static void master_socket_poll_event( struct fd *fd, int event );
  87
  88 static const struct object_ops master_socket_ops =
  89 {
  90     sizeof(struct master_socket),  /* size */
  91     master_socket_dump,            /* dump */
  92     no_add_queue,                  /* add_queue */
  93     NULL,                          /* remove_queue */
  94     NULL,                          /* signaled */
  95     NULL,                          /* satisfied */
  96     no_signal,                     /* signal */
  97     no_get_fd,                     /* get_fd */
  98     no_close_handle,               /* close_handle */
  99     master_socket_destroy          /* destroy */
 100 };
 101
 102 static const struct fd_ops master_socket_fd_ops =
 103 {
 104     NULL,                          /* get_poll_events */
 105     master_socket_poll_event,      /* poll_event */
 106     no_flush,                      /* flush */
 107     no_get_file_info,              /* get_file_info */
 108     no_queue_async,                /* queue_async */
 109     no_cancel_async                /* cancel_async */
 110 };
 111
 112
 113 struct thread *current = NULL;  /* thread handling the current request */
 114 unsigned int global_error = 0;  /* global error code for when no thread is current */
 115 time_t server_start_time = 0;  /* server startup time */
 116
 117 static struct master_socket *master_socket;  /* the master socket object */
 118
 119 /* socket communication static structures */
 120 static struct iovec myiovec;
 121 static struct msghdr msghdr;
 122 #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 123 struct cmsg_fd
 124 {
 125     struct
 126     {
 127         size_t len;   /* size of structure */
 128         int    level; /* SOL_SOCKET */
 129         int    type;  /* SCM_RIGHTS */
 130     } header;
 131     int fd;           /* fd to pass */
 132 };
 133 static struct cmsg_fd cmsg = { { sizeof(cmsg.header) + sizeof(cmsg.fd), SOL_SOCKET, SCM_RIGHTS }, -1 };
 134 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 135
 136 /* complain about a protocol error and terminate the client connection */
 137 void fatal_protocol_error( struct thread *thread, const char *err, ... )
 138 {
 139     va_list args;
 140
 141     va_start( args, err );
 142     fprintf( stderr, "Protocol error:%p: ", thread );
 143     vfprintf( stderr, err, args );
 144     va_end( args );
 145     thread->exit_code = 1;
 146     kill_thread( thread, 1 );
 147 }
 148
 149 /* complain about a protocol error and terminate the client connection */
 150 void fatal_protocol_perror( struct thread *thread, const char *err, ... )
 151 {
 152     va_list args;
 153
 154     va_start( args, err );
 155     fprintf( stderr, "Protocol error:%p: ", thread );
 156     vfprintf( stderr, err, args );
 157     perror( " " );
 158     va_end( args );
 159     thread->exit_code = 1;
 160     kill_thread( thread, 1 );
 161 }
 162
 163 /* die on a fatal error */
 164 void fatal_error( const char *err, ... )
 165 {
 166     va_list args;
 167
 168     va_start( args, err );
 169     fprintf( stderr, "wineserver: " );
 170     vfprintf( stderr, err, args );
 171     va_end( args );
 172     exit(1);
 173 }
 174
 175 /* die on a fatal error */
 176 void fatal_perror( const char *err, ... )
 177 {
 178     va_list args;
 179
 180     va_start( args, err );
 181     fprintf( stderr, "wineserver: " );
 182     vfprintf( stderr, err, args );
 183     perror( " " );
 184     va_end( args );
 185     exit(1);
 186 }
 187
 188 /* allocate the reply data */
 189 void *set_reply_data_size( size_t size )
 190 {
 191     assert( size <= get_reply_max_size() );
 192     if (size && !(current->reply_data = mem_alloc( size ))) size = 0;
 193     current->reply_size = size;
 194     return current->reply_data;
 195 }
 196
 197 /* write the remaining part of the reply */
 198 void write_reply( struct thread *thread )
 199 {
 200     int ret;
 201
 202     if ((ret = write( get_unix_fd( thread->reply_fd ),
 203                       (char *)thread->reply_data + thread->reply_size - thread->reply_towrite,
 204                       thread->reply_towrite )) >= 0)
 205     {
 206         if (!(thread->reply_towrite -= ret))
 207         {
 208             free( thread->reply_data );
 209             thread->reply_data = NULL;
 210             /* sent everything, can go back to waiting for requests */
 211             set_fd_events( thread->request_fd, POLLIN );
 212             set_fd_events( thread->reply_fd, 0 );
 213         }
 214         return;
 215     }
 216     if (errno == EPIPE)
 217         kill_thread( thread, 0 );  /* normal death */
 218     else if (errno != EWOULDBLOCK && errno != EAGAIN)
 219         fatal_protocol_perror( thread, "reply write" );
 220 }
 221
 222 /* send a reply to the current thread */
 223 static void send_reply( union generic_reply *reply )
 224 {
 225     int ret;
 226
 227     if (!current->reply_size)
 228     {
 229         if ((ret = write( get_unix_fd( current->reply_fd ),
 230                           reply, sizeof(*reply) )) != sizeof(*reply)) goto error;
 231     }
 232     else
 233     {
 234         struct iovec vec[2];
 235
 236         vec[0].iov_base = (void *)reply;
 237         vec[0].iov_len  = sizeof(*reply);
 238         vec[1].iov_base = current->reply_data;
 239         vec[1].iov_len  = current->reply_size;
 240
 241         if ((ret = writev( get_unix_fd( current->reply_fd ), vec, 2 )) < sizeof(*reply)) goto error;
 242
 243         if ((current->reply_towrite = current->reply_size - (ret - sizeof(*reply))))
 244         {
 245             /* couldn't write it all, wait for POLLOUT */
 246             set_fd_events( current->reply_fd, POLLOUT );
 247             set_fd_events( current->request_fd, 0 );
 248             return;
 249         }
 250     }
 251     if (current->reply_data)
 252     {
 253         free( current->reply_data );
 254         current->reply_data = NULL;
 255     }
 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     {
 282         req_handlers[req]( &current->req, &reply );
 283         if (current)
 284         {
 285             if (current->reply_fd)
 286             {
 287                 reply.reply_header.error = current->error;
 288                 reply.reply_header.reply_size = current->reply_size;
 289                 if (debug_level) trace_reply( req, &reply );
 290                 send_reply( &reply );
 291             }
 292             else fatal_protocol_error( current, "no reply fd for request %d\n", req );
 293         }
 294         current = NULL;
 295         return;
 296     }
 297     fatal_protocol_error( current, "bad request %d\n", req );
 298 }
 299
 300 /* read a request from a thread */
 301 void read_request( struct thread *thread )
 302 {
 303     int ret;
 304
 305     if (!thread->req_toread)  /* no pending request */
 306     {
 307         if ((ret = read( get_unix_fd( thread->request_fd ), &thread->req,
 308                          sizeof(thread->req) )) != sizeof(thread->req)) goto error;
 309         if (!(thread->req_toread = thread->req.request_header.request_size))
 310         {
 311             /* no data, handle request at once */
 312             call_req_handler( thread );
 313             return;
 314         }
 315         if (!(thread->req_data = malloc( thread->req_toread )))
 316             fatal_protocol_error( thread, "no memory for %d bytes request\n", thread->req_toread );
 317     }
 318
 319     /* read the variable sized data */
 320     for (;;)
 321     {
 322         ret = read( get_unix_fd( thread->request_fd ),
 323                     (char *)thread->req_data + thread->req.request_header.request_size
 324                       - thread->req_toread,
 325                     thread->req_toread );
 326         if (ret <= 0) break;
 327         if (!(thread->req_toread -= ret))
 328         {
 329             call_req_handler( thread );
 330             free( thread->req_data );
 331             thread->req_data = NULL;
 332             return;
 333         }
 334     }
 335
 336 error:
 337     if (!ret)  /* closed pipe */
 338         kill_thread( thread, 0 );
 339     else if (ret > 0)
 340         fatal_protocol_error( thread, "partial read %d\n", ret );
 341     else if (errno != EWOULDBLOCK && errno != EAGAIN)
 342         fatal_protocol_perror( thread, "read" );
 343 }
 344
 345 /* receive a file descriptor on the process socket */
 346 int receive_fd( struct process *process )
 347 {
 348     struct send_fd data;
 349     int fd, ret;
 350
 351 #ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 352     msghdr.msg_accrightslen = sizeof(int);
 353     msghdr.msg_accrights = (void *)&fd;
 354 #else  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 355     msghdr.msg_control    = &cmsg;
 356     msghdr.msg_controllen = sizeof(cmsg.header) + sizeof(fd);
 357     cmsg.fd = -1;
 358 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 359
 360     myiovec.iov_base = (void *)&data;
 361     myiovec.iov_len  = sizeof(data);
 362
 363     ret = recvmsg( get_unix_fd( process->msg_fd ), &msghdr, 0 );
 364 #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 365     fd = cmsg.fd;
 366 #endif
 367
 368     if (ret == sizeof(data))
 369     {
 370         struct thread *thread;
 371
 372         if (data.tid) thread = get_thread_from_id( data.tid );
 373         else thread = (struct thread *)grab_object( get_process_first_thread( process ));
 374
 375         if (!thread || thread->process != process || thread->state == TERMINATED)
 376         {
 377             if (debug_level)
 378                 fprintf( stderr, "%04x: *fd* %d <- %d bad thread id\n",
 379                          data.tid, data.fd, fd );
 380             close( fd );
 381         }
 382         else
 383         {
 384             if (debug_level)
 385                 fprintf( stderr, "%04x: *fd* %d <- %d\n",
 386                          thread->id, data.fd, fd );
 387             thread_add_inflight_fd( thread, data.fd, fd );
 388         }
 389         if (thread) release_object( thread );
 390         return 0;
 391     }
 392
 393     if (ret >= 0)
 394     {
 395         if (ret > 0)
 396             fprintf( stderr, "Protocol error: process %p: partial recvmsg %d for fd\n",
 397                      process, ret );
 398         kill_process( process, NULL, 1 );
 399     }
 400     else
 401     {
 402         if (errno != EWOULDBLOCK && errno != EAGAIN)
 403         {
 404             fprintf( stderr, "Protocol error: process %p: ", process );
 405             perror( "recvmsg" );
 406             kill_process( process, NULL, 1 );
 407         }
 408     }
 409     return -1;
 410 }
 411
 412 /* send an fd to a client */
 413 int send_client_fd( struct process *process, int fd, obj_handle_t handle )
 414 {
 415     int ret;
 416
 417     if (debug_level)
 418         fprintf( stderr, "%04x: *fd* %p -> %d\n",
 419                  current ? current->id : process->id, handle, fd );
 420
 421 #ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 422     msghdr.msg_accrightslen = sizeof(fd);
 423     msghdr.msg_accrights = (void *)&fd;
 424 #else  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 425     msghdr.msg_control    = &cmsg;
 426     msghdr.msg_controllen = sizeof(cmsg.header) + sizeof(fd);
 427     cmsg.fd = fd;
 428 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 429
 430     myiovec.iov_base = (void *)&handle;
 431     myiovec.iov_len  = sizeof(handle);
 432
 433     ret = sendmsg( get_unix_fd( process->msg_fd ), &msghdr, 0 );
 434
 435     if (ret == sizeof(handle)) return 0;
 436
 437     if (ret >= 0)
 438     {
 439         fprintf( stderr, "Protocol error: process %p: partial sendmsg %d\n", process, ret );
 440         kill_process( process, NULL, 1 );
 441     }
 442     else if (errno == EPIPE)
 443     {
 444         kill_process( process, NULL, 0 );
 445     }
 446     else
 447     {
 448         fprintf( stderr, "Protocol error: process %p: ", process );
 449         perror( "sendmsg" );
 450         kill_process( process, NULL, 1 );
 451     }
 452     return -1;
 453 }
 454
 455 /* get current tick count to return to client */
 456 unsigned int get_tick_count(void)
 457 {
 458     struct timeval t;
 459     gettimeofday( &t, NULL );
 460     return ((t.tv_sec - server_start_time) * 1000) + (t.tv_usec / 1000);
 461 }
 462
 463 static void master_socket_dump( struct object *obj, int verbose )
 464 {
 465     struct master_socket *sock = (struct master_socket *)obj;
 466     assert( obj->ops == &master_socket_ops );
 467     fprintf( stderr, "Master socket fd=%p\n", sock->fd );
 468 }
 469
 470 static void master_socket_destroy( struct object *obj )
 471 {
 472     struct master_socket *sock = (struct master_socket *)obj;
 473     assert( obj->ops == &master_socket_ops );
 474     release_object( sock->fd );
 475 }
 476
 477 /* handle a socket event */
 478 static void master_socket_poll_event( struct fd *fd, int event )
 479 {
 480     struct master_socket *sock = get_fd_user( fd );
 481     assert( master_socket->obj.ops == &master_socket_ops );
 482
 483     assert( sock == master_socket );  /* there is only one master socket */
 484
 485     if (event & (POLLERR | POLLHUP))
 486     {
 487         /* this is not supposed to happen */
 488         fprintf( stderr, "wineserver: Error on master socket\n" );
 489         release_object( sock );
 490     }
 491     else if (event & POLLIN)
 492     {
 493         struct sockaddr_un dummy;
 494         unsigned int len = sizeof(dummy);
 495         int client = accept( get_unix_fd( master_socket->fd ), (struct sockaddr *) &dummy, &len );
 496         if (client == -1) return;
 497         if (sock->timeout)
 498         {
 499             remove_timeout_user( sock->timeout );
 500             sock->timeout = NULL;
 501         }
 502         fcntl( client, F_SETFL, O_NONBLOCK );
 503         create_process( client );
 504     }
 505 }
 506
 507 /* remove the socket upon exit */
 508 static void socket_cleanup(void)
 509 {
 510     static int do_it_once;
 511     if (!do_it_once++) unlink( server_socket_name );
 512 }
 513
 514 /* create a directory and check its permissions */
 515 static void create_dir( const char *name, struct stat *st )
 516 {
 517     if (lstat( name, st ) == -1)
 518     {
 519         if (errno != ENOENT) fatal_perror( "lstat %s", name );
 520         if (mkdir( name, 0700 ) == -1 && errno != EEXIST) fatal_perror( "mkdir %s", name );
 521         if (lstat( name, st ) == -1) fatal_perror( "lstat %s", name );
 522     }
 523     if (!S_ISDIR(st->st_mode)) fatal_error( "%s is not a directory\n", name );
 524     if (st->st_uid != getuid()) fatal_error( "%s is not owned by you\n", name );
 525     if (st->st_mode & 077) fatal_error( "%s must not be accessible by other users\n", name );
 526 }
 527
 528 /* create the server directory and chdir to it */
 529 static void create_server_dir(void)
 530 {
 531     char *p, *server_dir;
 532     struct stat st, st2;
 533
 534     if (!(server_dir = strdup( wine_get_server_dir() ))) fatal_error( "out of memory\n" );
 535
 536     /* first create the base directory if needed */
 537
 538     p = strrchr( server_dir, '/' );
 539     *p = 0;
 540     create_dir( server_dir, &st );
 541
 542     /* now create the server directory */
 543
 544     *p = '/';
 545     create_dir( server_dir, &st );
 546
 547     if (chdir( server_dir ) == -1) fatal_perror( "chdir %s", server_dir );
 548     if (stat( ".", &st2 ) == -1) fatal_perror( "stat %s", server_dir );
 549     if (st.st_dev != st2.st_dev || st.st_ino != st2.st_ino)
 550         fatal_error( "chdir did not end up in %s\n", server_dir );
 551
 552     free( server_dir );
 553 }
 554
 555 /* create the lock file and return its file descriptor */
 556 static int create_server_lock(void)
 557 {
 558     struct stat st;
 559     int fd;
 560
 561     if (lstat( server_lock_name, &st ) == -1)
 562     {
 563         if (errno != ENOENT)
 564             fatal_perror( "lstat %s/%s", wine_get_server_dir(), server_lock_name );
 565     }
 566     else
 567     {
 568         if (!S_ISREG(st.st_mode))
 569             fatal_error( "%s/%s is not a regular file\n", wine_get_server_dir(), server_lock_name );
 570     }
 571
 572     if ((fd = open( server_lock_name, O_CREAT|O_TRUNC|O_WRONLY, 0600 )) == -1)
 573         fatal_perror( "error creating %s/%s", wine_get_server_dir(), server_lock_name );
 574     return fd;
 575 }
 576
 577 /* wait for the server lock */
 578 int wait_for_lock(void)
 579 {
 580     int fd, r;
 581     struct flock fl;
 582
 583     create_server_dir();
 584     fd = create_server_lock();
 585
 586     fl.l_type   = F_WRLCK;
 587     fl.l_whence = SEEK_SET;
 588     fl.l_start  = 0;
 589     fl.l_len    = 1;
 590     r = fcntl( fd, F_SETLKW, &fl );
 591     close(fd);
 592
 593     return r;
 594 }
 595
 596 /* kill the wine server holding the lock */
 597 int kill_lock_owner( int sig )
 598 {
 599     int fd, i, ret = 0;
 600     pid_t pid = 0;
 601     struct flock fl;
 602
 603     create_server_dir();
 604     fd = create_server_lock();
 605
 606     for (i = 0; i < 10; i++)
 607     {
 608         fl.l_type   = F_WRLCK;
 609         fl.l_whence = SEEK_SET;
 610         fl.l_start  = 0;
 611         fl.l_len    = 1;
 612         if (fcntl( fd, F_GETLK, &fl ) == -1) goto done;
 613         if (fl.l_type != F_WRLCK) goto done;  /* the file is not locked */
 614         if (!pid)  /* first time around */
 615         {
 616             if (!(pid = fl.l_pid)) goto done;  /* shouldn't happen */
 617             if (sig == -1)
 618             {
 619                 if (kill( pid, SIGINT ) == -1) goto done;
 620                 kill( pid, SIGCONT );
 621                 ret = 1;
 622             }
 623             else  /* just send the specified signal and return */
 624             {
 625                 ret = (kill( pid, sig ) != -1);
 626                 goto done;
 627             }
 628         }
 629         else if (fl.l_pid != pid) goto done;  /* no longer the same process */
 630         sleep( 1 );
 631     }
 632     /* waited long enough, now kill it */
 633     kill( pid, SIGKILL );
 634
 635  done:
 636     close( fd );
 637     return ret;
 638 }
 639
 640 /* acquire the main server lock */
 641 static void acquire_lock(void)
 642 {
 643     struct sockaddr_un addr;
 644     struct stat st;
 645     struct flock fl;
 646     int fd, slen, got_lock = 0;
 647
 648     fd = create_server_lock();
 649
 650     fl.l_type   = F_WRLCK;
 651     fl.l_whence = SEEK_SET;
 652     fl.l_start  = 0;
 653     fl.l_len    = 1;
 654     if (fcntl( fd, F_SETLK, &fl ) != -1)
 655     {
 656         /* check for crashed server */
 657         if (stat( server_socket_name, &st ) != -1 &&   /* there is a leftover socket */
 658             stat( "core", &st ) != -1 && st.st_size)   /* and there is a non-empty core file */
 659         {
 660             fprintf( stderr,
 661                      "Warning: a previous instance of the wine server seems to have crashed.\n"
 662                      "Please run 'gdb %s %s/core',\n"
 663                      "type 'backtrace' at the gdb prompt and report the results. Thanks.\n\n",
 664                      server_argv0, wine_get_server_dir() );
 665         }
 666         unlink( server_socket_name ); /* we got the lock, we can safely remove the socket */
 667         got_lock = 1;
 668         /* in that case we reuse fd without closing it, this ensures
 669          * that we hold the lock until the process exits */
 670     }
 671     else
 672     {
 673         switch(errno)
 674         {
 675         case ENOLCK:
 676             break;
 677         case EACCES:
 678             /* check whether locks work at all on this file system */
 679             if (fcntl( fd, F_GETLK, &fl ) == -1) break;
 680             /* fall through */
 681         case EAGAIN:
 682             exit(2); /* we didn't get the lock, exit with special status */
 683         default:
 684             fatal_perror( "fcntl %s/%s", wine_get_server_dir(), server_lock_name );
 685         }
 686         /* it seems we can't use locks on this fs, so we will use the socket existence as lock */
 687         close( fd );
 688     }
 689
 690     if ((fd = socket( AF_UNIX, SOCK_STREAM, 0 )) == -1) fatal_perror( "socket" );
 691     addr.sun_family = AF_UNIX;
 692     strcpy( addr.sun_path, server_socket_name );
 693     slen = sizeof(addr) - sizeof(addr.sun_path) + strlen(addr.sun_path) + 1;
 694 #ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN
 695     addr.sun_len = slen;
 696 #endif
 697     if (bind( fd, (struct sockaddr *)&addr, slen ) == -1)
 698     {
 699         if ((errno == EEXIST) || (errno == EADDRINUSE))
 700         {
 701             if (got_lock)
 702                 fatal_error( "couldn't bind to the socket even though we hold the lock\n" );
 703             exit(2); /* we didn't get the lock, exit with special status */
 704         }
 705         fatal_perror( "bind" );
 706     }
 707     atexit( socket_cleanup );
 708     chmod( server_socket_name, 0600 );  /* make sure no other user can connect */
 709     if (listen( fd, 5 ) == -1) fatal_perror( "listen" );
 710
 711     if (!(master_socket = alloc_object( &master_socket_ops )) ||
 712         !(master_socket->fd = create_anonymous_fd( &master_socket_fd_ops, fd, &master_socket->obj )))
 713         fatal_error( "out of memory\n" );
 714     master_socket->timeout = NULL;
 715     set_fd_events( master_socket->fd, POLLIN );
 716 }
 717
 718 /* open the master server socket and start waiting for new clients */
 719 void open_master_socket(void)
 720 {
 721     int fd, pid, status, sync_pipe[2];
 722     char dummy;
 723
 724     /* make sure no request is larger than the maximum size */
 725     assert( sizeof(union generic_request) == sizeof(struct request_max_size) );
 726     assert( sizeof(union generic_reply) == sizeof(struct request_max_size) );
 727
 728     create_server_dir();
 729
 730     if (!foreground)
 731     {
 732         if (pipe( sync_pipe ) == -1) fatal_perror( "pipe" );
 733         pid = fork();
 734         switch( pid )
 735         {
 736         case 0:  /* child */
 737             setsid();
 738             close( sync_pipe[0] );
 739
 740             acquire_lock();
 741
 742             /* close stdin and stdout */
 743             if ((fd = open( "/dev/null", O_RDWR )) != -1)
 744             {
 745                 dup2( fd, 0 );
 746                 dup2( fd, 1 );
 747                 close( fd );
 748             }
 749
 750             /* signal parent */
 751             write( sync_pipe[1], &dummy, 1 );
 752             close( sync_pipe[1] );
 753             break;
 754
 755         case -1:
 756             fatal_perror( "fork" );
 757             break;
 758
 759         default:  /* parent */
 760             close( sync_pipe[1] );
 761
 762             /* wait for child to signal us and then exit */
 763             if (read( sync_pipe[0], &dummy, 1 ) == 1) _exit(0);
 764
 765             /* child terminated, propagate exit status */
 766             wait4( pid, &status, 0, NULL );
 767             if (WIFEXITED(status)) _exit( WEXITSTATUS(status) );
 768             _exit(1);
 769         }
 770     }
 771     else  /* remain in the foreground */
 772     {
 773         acquire_lock();
 774     }
 775
 776     /* setup msghdr structure constant fields */
 777     msghdr.msg_name    = NULL;
 778     msghdr.msg_namelen = 0;
 779     msghdr.msg_iov     = &myiovec;
 780     msghdr.msg_iovlen  = 1;
 781
 782     /* init startup time */
 783     server_start_time = time(NULL);
 784 }
 785
 786 /* master socket timer expiration handler */
 787 static void close_socket_timeout( void *arg )
 788 {
 789     master_socket->timeout = NULL;
 790     flush_registry();
 791
 792     /* if a new client is waiting, we keep on running */
 793     if (check_fd_events( master_socket->fd, POLLIN )) return;
 794
 795     if (debug_level) fprintf( stderr, "wineserver: exiting (pid=%ld)\n", (long) getpid() );
 796
 797 #ifdef DEBUG_OBJECTS
 798     /* shut down everything properly */
 799     release_object( master_socket );
 800     close_signals();
 801     close_global_handles();
 802     close_registry();
 803     dump_objects();  /* dump any remaining objects */
 804 #else
 805     exit(0);
 806 #endif
 807 }
 808
 809 /* close the master socket and stop waiting for new clients */
 810 void close_master_socket(void)
 811 {
 812     struct timeval when;
 813
 814     if (master_socket_timeout == -1) return;  /* just keep running forever */
 815
 816     if (master_socket_timeout)
 817     {
 818         gettimeofday( &when, NULL );
 819         add_timeout( &when, master_socket_timeout * 1000 );
 820         master_socket->timeout = add_timeout_user( &when, close_socket_timeout, NULL );
 821     }
 822     else close_socket_timeout( NULL );  /* close it right away */
 823 }
 824
 825 /* lock/unlock the master socket to stop accepting new clients */
 826 void lock_master_socket( int locked )
 827 {
 828     set_fd_events( master_socket->fd, locked ? 0 : POLLIN );
 829 }