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
  52 #include "windef.h"
  53 #include "winbase.h"
  54 #include "wincon.h"
  55 #include "wine/library.h"
  56
  57 #include "file.h"
  58 #include "handle.h"
  59 #include "thread.h"
  60 #include "process.h"
  61 #include "user.h"
  62 #define WANT_REQUEST_HANDLERS
  63 #include "request.h"
  64
  65 /* Some versions of glibc don't define this */
  66 #ifndef SCM_RIGHTS
  67 #define SCM_RIGHTS 1
  68 #endif
  69
  70 /* path names for server master Unix socket */
  71 static const char * const server_socket_name = "socket";   /* name of the socket file */
  72 static const char * const server_lock_name = "lock";       /* name of the server lock file */
  73
  74 struct master_socket
  75 {
  76     struct object        obj;        /* object header */
  77     struct fd           *fd;         /* file descriptor of the master socket */
  78     struct timeout_user *timeout;    /* timeout on last process exit */
  79 };
  80
  81 static void master_socket_dump( struct object *obj, int verbose );
  82 static void master_socket_destroy( struct object *obj );
  83 static void master_socket_poll_event( struct fd *fd, int event );
  84
  85 static const struct object_ops master_socket_ops =
  86 {
  87     sizeof(struct master_socket),  /* size */
  88     master_socket_dump,            /* dump */
  89     no_add_queue,                  /* add_queue */
  90     NULL,                          /* remove_queue */
  91     NULL,                          /* signaled */
  92     NULL,                          /* satisfied */
  93     no_get_fd,                     /* get_fd */
  94     master_socket_destroy          /* destroy */
  95 };
  96
  97 static const struct fd_ops master_socket_fd_ops =
  98 {
  99     NULL,                          /* get_poll_events */
 100     master_socket_poll_event,      /* poll_event */
 101     no_flush,                      /* flush */
 102     no_get_file_info,              /* get_file_info */
 103     no_queue_async,                /* queue_async */
 104     no_cancel_async                /* cancel_async */
 105 };
 106
 107
 108 struct thread *current = NULL;  /* thread handling the current request */
 109 unsigned int global_error = 0;  /* global error code for when no thread is current */
 110 unsigned int server_start_ticks = 0;  /* tick count offset from server startup */
 111
 112 static struct master_socket *master_socket;  /* the master socket object */
 113
 114 /* socket communication static structures */
 115 static struct iovec myiovec;
 116 static struct msghdr msghdr;
 117 #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 118 struct cmsg_fd
 119 {
 120     int len;   /* size of structure */
 121     int level; /* SOL_SOCKET */
 122     int type;  /* SCM_RIGHTS */
 123     int fd;    /* fd to pass */
 124 };
 125 static struct cmsg_fd cmsg = { sizeof(cmsg), SOL_SOCKET, SCM_RIGHTS, -1 };
 126 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 127
 128 /* complain about a protocol error and terminate the client connection */
 129 void fatal_protocol_error( struct thread *thread, const char *err, ... )
 130 {
 131     va_list args;
 132
 133     va_start( args, err );
 134     fprintf( stderr, "Protocol error:%p: ", thread );
 135     vfprintf( stderr, err, args );
 136     va_end( args );
 137     thread->exit_code = 1;
 138     kill_thread( thread, 1 );
 139 }
 140
 141 /* complain about a protocol error and terminate the client connection */
 142 void fatal_protocol_perror( struct thread *thread, const char *err, ... )
 143 {
 144     va_list args;
 145
 146     va_start( args, err );
 147     fprintf( stderr, "Protocol error:%p: ", thread );
 148     vfprintf( stderr, err, args );
 149     perror( " " );
 150     va_end( args );
 151     thread->exit_code = 1;
 152     kill_thread( thread, 1 );
 153 }
 154
 155 /* die on a fatal error */
 156 void fatal_error( const char *err, ... )
 157 {
 158     va_list args;
 159
 160     va_start( args, err );
 161     fprintf( stderr, "wineserver: " );
 162     vfprintf( stderr, err, args );
 163     va_end( args );
 164     exit(1);
 165 }
 166
 167 /* die on a fatal error */
 168 void fatal_perror( const char *err, ... )
 169 {
 170     va_list args;
 171
 172     va_start( args, err );
 173     fprintf( stderr, "wineserver: " );
 174     vfprintf( stderr, err, args );
 175     perror( " " );
 176     va_end( args );
 177     exit(1);
 178 }
 179
 180 /* allocate the reply data */
 181 void *set_reply_data_size( size_t size )
 182 {
 183     assert( size <= get_reply_max_size() );
 184     if (size && !(current->reply_data = mem_alloc( size ))) size = 0;
 185     current->reply_size = size;
 186     return current->reply_data;
 187 }
 188
 189 /* write the remaining part of the reply */
 190 void write_reply( struct thread *thread )
 191 {
 192     int ret;
 193
 194     if ((ret = write( get_unix_fd( thread->reply_fd ),
 195                       (char *)thread->reply_data + thread->reply_size - thread->reply_towrite,
 196                       thread->reply_towrite )) >= 0)
 197     {
 198         if (!(thread->reply_towrite -= ret))
 199         {
 200             free( thread->reply_data );
 201             thread->reply_data = NULL;
 202             /* sent everything, can go back to waiting for requests */
 203             set_fd_events( thread->request_fd, POLLIN );
 204             set_fd_events( thread->reply_fd, 0 );
 205         }
 206         return;
 207     }
 208     if (errno == EPIPE)
 209         kill_thread( thread, 0 );  /* normal death */
 210     else if (errno != EWOULDBLOCK && errno != EAGAIN)
 211         fatal_protocol_perror( thread, "reply write" );
 212 }
 213
 214 /* send a reply to the current thread */
 215 static void send_reply( union generic_reply *reply )
 216 {
 217     int ret;
 218
 219     if (!current->reply_size)
 220     {
 221         if ((ret = write( get_unix_fd( current->reply_fd ),
 222                           reply, sizeof(*reply) )) != sizeof(*reply)) goto error;
 223     }
 224     else
 225     {
 226         struct iovec vec[2];
 227
 228         vec[0].iov_base = (void *)reply;
 229         vec[0].iov_len  = sizeof(*reply);
 230         vec[1].iov_base = current->reply_data;
 231         vec[1].iov_len  = current->reply_size;
 232
 233         if ((ret = writev( get_unix_fd( current->reply_fd ), vec, 2 )) < sizeof(*reply)) goto error;
 234
 235         if ((current->reply_towrite = current->reply_size - (ret - sizeof(*reply))))
 236         {
 237             /* couldn't write it all, wait for POLLOUT */
 238             set_fd_events( current->reply_fd, POLLOUT );
 239             set_fd_events( current->request_fd, 0 );
 240             return;
 241         }
 242     }
 243     if (current->reply_data)
 244     {
 245         free( current->reply_data );
 246         current->reply_data = NULL;
 247     }
 248     return;
 249
 250  error:
 251     if (ret >= 0)
 252         fatal_protocol_error( current, "partial write %d\n", ret );
 253     else if (errno == EPIPE)
 254         kill_thread( current, 0 );  /* normal death */
 255     else
 256         fatal_protocol_perror( current, "reply write" );
 257 }
 258
 259 /* call a request handler */
 260 static void call_req_handler( struct thread *thread )
 261 {
 262     union generic_reply reply;
 263     enum request req = thread->req.request_header.req;
 264
 265     current = thread;
 266     current->reply_size = 0;
 267     clear_error();
 268     memset( &reply, 0, sizeof(reply) );
 269
 270     if (debug_level) trace_request();
 271
 272     if (req < REQ_NB_REQUESTS)
 273     {
 274         req_handlers[req]( &current->req, &reply );
 275         if (current)
 276         {
 277             if (current->reply_fd)
 278             {
 279                 reply.reply_header.error = current->error;
 280                 reply.reply_header.reply_size = current->reply_size;
 281                 if (debug_level) trace_reply( req, &reply );
 282                 send_reply( &reply );
 283             }
 284             else fatal_protocol_error( current, "no reply fd for request %d\n", req );
 285         }
 286         current = NULL;
 287         return;
 288     }
 289     fatal_protocol_error( current, "bad request %d\n", req );
 290 }
 291
 292 /* read a request from a thread */
 293 void read_request( struct thread *thread )
 294 {
 295     int ret;
 296
 297     if (!thread->req_toread)  /* no pending request */
 298     {
 299         if ((ret = read( get_unix_fd( thread->request_fd ), &thread->req,
 300                          sizeof(thread->req) )) != sizeof(thread->req)) goto error;
 301         if (!(thread->req_toread = thread->req.request_header.request_size))
 302         {
 303             /* no data, handle request at once */
 304             call_req_handler( thread );
 305             return;
 306         }
 307         if (!(thread->req_data = malloc( thread->req_toread )))
 308             fatal_protocol_error( thread, "no memory for %d bytes request\n", thread->req_toread );
 309     }
 310
 311     /* read the variable sized data */
 312     for (;;)
 313     {
 314         ret = read( get_unix_fd( thread->request_fd ),
 315                     (char *)thread->req_data + thread->req.request_header.request_size
 316                       - thread->req_toread,
 317                     thread->req_toread );
 318         if (ret <= 0) break;
 319         if (!(thread->req_toread -= ret))
 320         {
 321             call_req_handler( thread );
 322             free( thread->req_data );
 323             thread->req_data = NULL;
 324             return;
 325         }
 326     }
 327
 328 error:
 329     if (!ret)  /* closed pipe */
 330         kill_thread( thread, 0 );
 331     else if (ret > 0)
 332         fatal_protocol_error( thread, "partial read %d\n", ret );
 333     else if (errno != EWOULDBLOCK && errno != EAGAIN)
 334         fatal_protocol_perror( thread, "read" );
 335 }
 336
 337 /* receive a file descriptor on the process socket */
 338 int receive_fd( struct process *process )
 339 {
 340     struct send_fd data;
 341     int fd, ret;
 342
 343 #ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 344     msghdr.msg_accrightslen = sizeof(int);
 345     msghdr.msg_accrights = (void *)&fd;
 346 #else  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 347     msghdr.msg_control    = &cmsg;
 348     msghdr.msg_controllen = sizeof(cmsg);
 349     cmsg.fd = -1;
 350 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 351
 352     myiovec.iov_base = (void *)&data;
 353     myiovec.iov_len  = sizeof(data);
 354
 355     ret = recvmsg( get_unix_fd( process->msg_fd ), &msghdr, 0 );
 356 #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 357     fd = cmsg.fd;
 358 #endif
 359
 360     if (ret == sizeof(data))
 361     {
 362         struct thread *thread;
 363
 364         if (data.tid) thread = get_thread_from_id( data.tid );
 365         else thread = (struct thread *)grab_object( process->thread_list );
 366
 367         if (!thread || thread->process != process || thread->state == TERMINATED)
 368         {
 369             if (debug_level)
 370                 fprintf( stderr, "%04x: *fd* %d <- %d bad thread id\n",
 371                          data.tid, data.fd, fd );
 372             close( fd );
 373         }
 374         else
 375         {
 376             if (debug_level)
 377                 fprintf( stderr, "%04x: *fd* %d <- %d\n",
 378                          thread->id, data.fd, fd );
 379             thread_add_inflight_fd( thread, data.fd, fd );
 380         }
 381         if (thread) release_object( thread );
 382         return 0;
 383     }
 384
 385     if (ret >= 0)
 386     {
 387         if (ret > 0)
 388             fprintf( stderr, "Protocol error: process %p: partial recvmsg %d for fd\n",
 389                      process, ret );
 390         kill_process( process, NULL, 1 );
 391     }
 392     else
 393     {
 394         if (errno != EWOULDBLOCK && errno != EAGAIN)
 395         {
 396             fprintf( stderr, "Protocol error: process %p: ", process );
 397             perror( "recvmsg" );
 398             kill_process( process, NULL, 1 );
 399         }
 400     }
 401     return -1;
 402 }
 403
 404 /* send an fd to a client */
 405 int send_client_fd( struct process *process, int fd, obj_handle_t handle )
 406 {
 407     int ret;
 408
 409     if (debug_level)
 410         fprintf( stderr, "%04x: *fd* %p -> %d\n",
 411                  current ? current->id : process->id, handle, fd );
 412
 413 #ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 414     msghdr.msg_accrightslen = sizeof(fd);
 415     msghdr.msg_accrights = (void *)&fd;
 416 #else  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 417     msghdr.msg_control    = &cmsg;
 418     msghdr.msg_controllen = sizeof(cmsg);
 419     cmsg.fd = fd;
 420 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 421
 422     myiovec.iov_base = (void *)&handle;
 423     myiovec.iov_len  = sizeof(handle);
 424
 425     ret = sendmsg( get_unix_fd( process->msg_fd ), &msghdr, 0 );
 426
 427     if (ret == sizeof(handle)) return 0;
 428
 429     if (ret >= 0)
 430     {
 431         fprintf( stderr, "Protocol error: process %p: partial sendmsg %d\n", process, ret );
 432         kill_process( process, NULL, 1 );
 433     }
 434     else if (errno == EPIPE)
 435     {
 436         kill_process( process, NULL, 0 );
 437     }
 438     else
 439     {
 440         fprintf( stderr, "Protocol error: process %p: ", process );
 441         perror( "sendmsg" );
 442         kill_process( process, NULL, 1 );
 443     }
 444     return -1;
 445 }
 446
 447 /* get current tick count to return to client */
 448 unsigned int get_tick_count(void)
 449 {
 450     struct timeval t;
 451     gettimeofday( &t, NULL );
 452     return (t.tv_sec * 1000) + (t.tv_usec / 1000) - server_start_ticks;
 453 }
 454
 455 static void master_socket_dump( struct object *obj, int verbose )
 456 {
 457     struct master_socket *sock = (struct master_socket *)obj;
 458     assert( obj->ops == &master_socket_ops );
 459     fprintf( stderr, "Master socket fd=%p\n", sock->fd );
 460 }
 461
 462 static void master_socket_destroy( struct object *obj )
 463 {
 464     struct master_socket *sock = (struct master_socket *)obj;
 465     assert( obj->ops == &master_socket_ops );
 466     release_object( sock->fd );
 467 }
 468
 469 /* handle a socket event */
 470 static void master_socket_poll_event( struct fd *fd, int event )
 471 {
 472     struct master_socket *sock = get_fd_user( fd );
 473     assert( master_socket->obj.ops == &master_socket_ops );
 474
 475     assert( sock == master_socket );  /* there is only one master socket */
 476
 477     if (event & (POLLERR | POLLHUP))
 478     {
 479         /* this is not supposed to happen */
 480         fprintf( stderr, "wineserver: Error on master socket\n" );
 481         release_object( sock );
 482     }
 483     else if (event & POLLIN)
 484     {
 485         struct sockaddr_un dummy;
 486         int len = sizeof(dummy);
 487         int client = accept( get_unix_fd( master_socket->fd ), (struct sockaddr *) &dummy, &len );
 488         if (client == -1) return;
 489         if (sock->timeout)
 490         {
 491             remove_timeout_user( sock->timeout );
 492             sock->timeout = NULL;
 493         }
 494         fcntl( client, F_SETFL, O_NONBLOCK );
 495         create_process( client );
 496     }
 497 }
 498
 499 /* remove the socket upon exit */
 500 static void socket_cleanup(void)
 501 {
 502     static int do_it_once;
 503     if (!do_it_once++) unlink( server_socket_name );
 504 }
 505
 506 /* create a directory and check its permissions */
 507 static void create_dir( const char *name, struct stat *st )
 508 {
 509     if (lstat( name, st ) == -1)
 510     {
 511         if (errno != ENOENT) fatal_perror( "lstat %s", name );
 512         if (mkdir( name, 0700 ) == -1) fatal_perror( "mkdir %s", name );
 513         if (lstat( name, st ) == -1) fatal_perror( "lstat %s", name );
 514     }
 515     if (!S_ISDIR(st->st_mode)) fatal_error( "%s is not a directory\n", name );
 516     if (st->st_uid != getuid()) fatal_error( "%s is not owned by you\n", name );
 517     if (st->st_mode & 077) fatal_error( "%s must not be accessible by other users\n", name );
 518 }
 519
 520 /* create the server directory and chdir to it */
 521 static void create_server_dir(void)
 522 {
 523     char *p, *server_dir;
 524     struct stat st, st2;
 525
 526     if (!(server_dir = strdup( wine_get_server_dir() ))) fatal_error( "out of memory\n" );
 527
 528     /* first create the base directory if needed */
 529
 530     p = strrchr( server_dir, '/' );
 531     *p = 0;
 532     create_dir( server_dir, &st );
 533
 534     /* now create the server directory */
 535
 536     *p = '/';
 537     create_dir( server_dir, &st );
 538
 539     if (chdir( server_dir ) == -1) fatal_perror( "chdir %s", server_dir );
 540     if (stat( ".", &st2 ) == -1) fatal_perror( "stat %s", server_dir );
 541     if (st.st_dev != st2.st_dev || st.st_ino != st2.st_ino)
 542         fatal_error( "chdir did not end up in %s\n", server_dir );
 543
 544     free( server_dir );
 545 }
 546
 547 /* create the lock file and return its file descriptor */
 548 static int create_server_lock(void)
 549 {
 550     struct stat st;
 551     int fd;
 552
 553     if (lstat( server_lock_name, &st ) == -1)
 554     {
 555         if (errno != ENOENT)
 556             fatal_perror( "lstat %s/%s", wine_get_server_dir(), server_lock_name );
 557     }
 558     else
 559     {
 560         if (!S_ISREG(st.st_mode))
 561             fatal_error( "%s/%s is not a regular file\n", wine_get_server_dir(), server_lock_name );
 562     }
 563
 564     if ((fd = open( server_lock_name, O_CREAT|O_TRUNC|O_WRONLY, 0600 )) == -1)
 565         fatal_perror( "error creating %s/%s", wine_get_server_dir(), server_lock_name );
 566     return fd;
 567 }
 568
 569 /* wait for the server lock */
 570 int wait_for_lock(void)
 571 {
 572     int fd, r;
 573     struct flock fl;
 574
 575     create_server_dir();
 576     fd = create_server_lock();
 577
 578     fl.l_type   = F_WRLCK;
 579     fl.l_whence = SEEK_SET;
 580     fl.l_start  = 0;
 581     fl.l_len    = 1;
 582     r = fcntl( fd, F_SETLKW, &fl );
 583     close(fd);
 584
 585     return r;
 586 }
 587
 588 /* kill the wine server holding the lock */
 589 int kill_lock_owner( int sig )
 590 {
 591     int fd, i, ret = 0;
 592     pid_t pid = 0;
 593     struct flock fl;
 594
 595     create_server_dir();
 596     fd = create_server_lock();
 597
 598     for (i = 0; i < 10; i++)
 599     {
 600         fl.l_type   = F_WRLCK;
 601         fl.l_whence = SEEK_SET;
 602         fl.l_start  = 0;
 603         fl.l_len    = 1;
 604         if (fcntl( fd, F_GETLK, &fl ) == -1) goto done;
 605         if (fl.l_type != F_WRLCK) goto done;  /* the file is not locked */
 606         if (!pid)  /* first time around */
 607         {
 608             if (!(pid = fl.l_pid)) goto done;  /* shouldn't happen */
 609             if (sig == -1)
 610             {
 611                 if (kill( pid, SIGINT ) == -1) goto done;
 612                 kill( pid, SIGCONT );
 613                 ret = 1;
 614             }
 615             else  /* just send the specified signal and return */
 616             {
 617                 ret = (kill( pid, sig ) != -1);
 618                 goto done;
 619             }
 620         }
 621         else if (fl.l_pid != pid) goto done;  /* no longer the same process */
 622         sleep( 1 );
 623     }
 624     /* waited long enough, now kill it */
 625     kill( pid, SIGKILL );
 626
 627  done:
 628     close( fd );
 629     return ret;
 630 }
 631
 632 /* acquire the main server lock */
 633 static void acquire_lock(void)
 634 {
 635     struct sockaddr_un addr;
 636     struct stat st;
 637     struct flock fl;
 638     int fd, slen, got_lock = 0;
 639
 640     fd = create_server_lock();
 641
 642     fl.l_type   = F_WRLCK;
 643     fl.l_whence = SEEK_SET;
 644     fl.l_start  = 0;
 645     fl.l_len    = 1;
 646     if (fcntl( fd, F_SETLK, &fl ) != -1)
 647     {
 648         /* check for crashed server */
 649         if (stat( server_socket_name, &st ) != -1 &&   /* there is a leftover socket */
 650             stat( "core", &st ) != -1 && st.st_size)   /* and there is a non-empty core file */
 651         {
 652             fprintf( stderr,
 653                      "Warning: a previous instance of the wine server seems to have crashed.\n"
 654                      "Please run 'gdb %s %s/core',\n"
 655                      "type 'backtrace' at the gdb prompt and report the results. Thanks.\n\n",
 656                      server_argv0, wine_get_server_dir() );
 657         }
 658         unlink( server_socket_name ); /* we got the lock, we can safely remove the socket */
 659         got_lock = 1;
 660         /* in that case we reuse fd without closing it, this ensures
 661          * that we hold the lock until the process exits */
 662     }
 663     else
 664     {
 665         switch(errno)
 666         {
 667         case ENOLCK:
 668             break;
 669         case EACCES:
 670             /* check whether locks work at all on this file system */
 671             if (fcntl( fd, F_GETLK, &fl ) == -1) break;
 672             /* fall through */
 673         case EAGAIN:
 674             exit(2); /* we didn't get the lock, exit with special status */
 675         default:
 676             fatal_perror( "fcntl %s/%s", wine_get_server_dir(), server_lock_name );
 677         }
 678         /* it seems we can't use locks on this fs, so we will use the socket existence as lock */
 679         close( fd );
 680     }
 681
 682     if ((fd = socket( AF_UNIX, SOCK_STREAM, 0 )) == -1) fatal_perror( "socket" );
 683     addr.sun_family = AF_UNIX;
 684     strcpy( addr.sun_path, server_socket_name );
 685     slen = sizeof(addr) - sizeof(addr.sun_path) + strlen(addr.sun_path) + 1;
 686 #ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN
 687     addr.sun_len = slen;
 688 #endif
 689     if (bind( fd, (struct sockaddr *)&addr, slen ) == -1)
 690     {
 691         if ((errno == EEXIST) || (errno == EADDRINUSE))
 692         {
 693             if (got_lock)
 694                 fatal_error( "couldn't bind to the socket even though we hold the lock\n" );
 695             exit(2); /* we didn't get the lock, exit with special status */
 696         }
 697         fatal_perror( "bind" );
 698     }
 699     atexit( socket_cleanup );
 700     chmod( server_socket_name, 0600 );  /* make sure no other user can connect */
 701     if (listen( fd, 5 ) == -1) fatal_perror( "listen" );
 702
 703     if (!(master_socket = alloc_object( &master_socket_ops )) ||
 704         !(master_socket->fd = create_anonymous_fd( &master_socket_fd_ops, fd, &master_socket->obj )))
 705         fatal_error( "out of memory\n" );
 706     master_socket->timeout = NULL;
 707     set_fd_events( master_socket->fd, POLLIN );
 708 }
 709
 710 /* open the master server socket and start waiting for new clients */
 711 void open_master_socket(void)
 712 {
 713     int fd, pid, status, sync_pipe[2];
 714     char dummy;
 715
 716     /* make sure no request is larger than the maximum size */
 717     assert( sizeof(union generic_request) == sizeof(struct request_max_size) );
 718     assert( sizeof(union generic_reply) == sizeof(struct request_max_size) );
 719
 720     create_server_dir();
 721
 722     if (!foreground)
 723     {
 724         if (pipe( sync_pipe ) == -1) fatal_perror( "pipe" );
 725         pid = fork();
 726         switch( pid )
 727         {
 728         case 0:  /* child */
 729             setsid();
 730             close( sync_pipe[0] );
 731
 732             acquire_lock();
 733
 734             /* close stdin and stdout */
 735             if ((fd = open( "/dev/null", O_RDWR )) != -1)
 736             {
 737                 dup2( fd, 0 );
 738                 dup2( fd, 1 );
 739                 close( fd );
 740             }
 741
 742             /* signal parent */
 743             write( sync_pipe[1], &dummy, 1 );
 744             close( sync_pipe[1] );
 745             break;
 746
 747         case -1:
 748             fatal_perror( "fork" );
 749             break;
 750
 751         default:  /* parent */
 752             close( sync_pipe[1] );
 753
 754             /* wait for child to signal us and then exit */
 755             if (read( sync_pipe[0], &dummy, 1 ) == 1) _exit(0);
 756
 757             /* child terminated, propagate exit status */
 758             wait4( pid, &status, 0, NULL );
 759             if (WIFEXITED(status)) _exit( WEXITSTATUS(status) );
 760             _exit(1);
 761         }
 762     }
 763     else  /* remain in the foreground */
 764     {
 765         acquire_lock();
 766     }
 767
 768     /* setup msghdr structure constant fields */
 769     msghdr.msg_name    = NULL;
 770     msghdr.msg_namelen = 0;
 771     msghdr.msg_iov     = &myiovec;
 772     msghdr.msg_iovlen  = 1;
 773
 774     /* init startup ticks */
 775     server_start_ticks = get_tick_count();
 776 }
 777
 778 /* master socket timer expiration handler */
 779 static void close_socket_timeout( void *arg )
 780 {
 781     master_socket->timeout = NULL;
 782     flush_registry();
 783
 784     /* if a new client is waiting, we keep on running */
 785     if (check_fd_events( master_socket->fd, POLLIN )) return;
 786
 787     if (debug_level) fprintf( stderr, "wineserver: exiting (pid=%ld)\n", (long) getpid() );
 788
 789 #ifdef DEBUG_OBJECTS
 790     /* shut down everything properly */
 791     release_object( master_socket );
 792     close_signals();
 793     close_global_hooks();
 794     close_global_handles();
 795     close_registry();
 796     close_atom_table();
 797     dump_objects();  /* dump any remaining objects */
 798 #else
 799     exit(0);
 800 #endif
 801 }
 802
 803 /* close the master socket and stop waiting for new clients */
 804 void close_master_socket(void)
 805 {
 806     struct timeval when;
 807
 808     if (master_socket_timeout == -1) return;  /* just keep running forever */
 809
 810     if (master_socket_timeout)
 811     {
 812         gettimeofday( &when, 0 );
 813         add_timeout( &when, master_socket_timeout * 1000 );
 814         master_socket->timeout = add_timeout_user( &when, close_socket_timeout, NULL );
 815     }
 816     else close_socket_timeout( NULL );  /* close it right away */
 817 }
 818
 819 /* lock/unlock the master socket to stop accepting new clients */
 820 void lock_master_socket( int locked )
 821 {
 822     set_fd_events( master_socket->fd, locked ? 0 : POLLIN );
 823 }