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_lookup_name,                /* lookup_name */
  99     no_close_handle,               /* close_handle */
 100     master_socket_destroy          /* destroy */
 101 };
 102
 103 static const struct fd_ops master_socket_fd_ops =
 104 {
 105     NULL,                          /* get_poll_events */
 106     master_socket_poll_event,      /* poll_event */
 107     no_flush,                      /* flush */
 108     no_get_file_info,              /* get_file_info */
 109     no_queue_async,                /* queue_async */
 110     no_cancel_async                /* cancel_async */
 111 };
 112
 113
 114 struct thread *current = NULL;  /* thread handling the current request */
 115 unsigned int global_error = 0;  /* global error code for when no thread is current */
 116 time_t server_start_time = 0;  /* server startup time */
 117
 118 static struct master_socket *master_socket;  /* the master socket object */
 119
 120 /* socket communication static structures */
 121 static struct iovec myiovec;
 122 static struct msghdr msghdr;
 123 #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 124 struct cmsg_fd
 125 {
 126     struct
 127     {
 128         size_t len;   /* size of structure */
 129         int    level; /* SOL_SOCKET */
 130         int    type;  /* SCM_RIGHTS */
 131     } header;
 132     int fd;           /* fd to pass */
 133 };
 134 static struct cmsg_fd cmsg = { { sizeof(cmsg.header) + sizeof(cmsg.fd), SOL_SOCKET, SCM_RIGHTS }, -1 };
 135 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 136
 137 /* complain about a protocol error and terminate the client connection */
 138 void fatal_protocol_error( struct thread *thread, const char *err, ... )
 139 {
 140     va_list args;
 141
 142     va_start( args, err );
 143     fprintf( stderr, "Protocol error:%p: ", thread );
 144     vfprintf( stderr, err, args );
 145     va_end( args );
 146     thread->exit_code = 1;
 147     kill_thread( thread, 1 );
 148 }
 149
 150 /* complain about a protocol error and terminate the client connection */
 151 void fatal_protocol_perror( struct thread *thread, const char *err, ... )
 152 {
 153     va_list args;
 154
 155     va_start( args, err );
 156     fprintf( stderr, "Protocol error:%p: ", thread );
 157     vfprintf( stderr, err, args );
 158     perror( " " );
 159     va_end( args );
 160     thread->exit_code = 1;
 161     kill_thread( thread, 1 );
 162 }
 163
 164 /* die on a fatal error */
 165 void fatal_error( const char *err, ... )
 166 {
 167     va_list args;
 168
 169     va_start( args, err );
 170     fprintf( stderr, "wineserver: " );
 171     vfprintf( stderr, err, args );
 172     va_end( args );
 173     exit(1);
 174 }
 175
 176 /* die on a fatal error */
 177 void fatal_perror( const char *err, ... )
 178 {
 179     va_list args;
 180
 181     va_start( args, err );
 182     fprintf( stderr, "wineserver: " );
 183     vfprintf( stderr, err, args );
 184     perror( " " );
 185     va_end( args );
 186     exit(1);
 187 }
 188
 189 /* allocate the reply data */
 190 void *set_reply_data_size( size_t size )
 191 {
 192     assert( size <= get_reply_max_size() );
 193     if (size && !(current->reply_data = mem_alloc( size ))) size = 0;
 194     current->reply_size = size;
 195     return current->reply_data;
 196 }
 197
 198 /* write the remaining part of the reply */
 199 void write_reply( struct thread *thread )
 200 {
 201     int ret;
 202
 203     if ((ret = write( get_unix_fd( thread->reply_fd ),
 204                       (char *)thread->reply_data + thread->reply_size - thread->reply_towrite,
 205                       thread->reply_towrite )) >= 0)
 206     {
 207         if (!(thread->reply_towrite -= ret))
 208         {
 209             free( thread->reply_data );
 210             thread->reply_data = NULL;
 211             /* sent everything, can go back to waiting for requests */
 212             set_fd_events( thread->request_fd, POLLIN );
 213             set_fd_events( thread->reply_fd, 0 );
 214         }
 215         return;
 216     }
 217     if (errno == EPIPE)
 218         kill_thread( thread, 0 );  /* normal death */
 219     else if (errno != EWOULDBLOCK && errno != EAGAIN)
 220         fatal_protocol_perror( thread, "reply write" );
 221 }
 222
 223 /* send a reply to the current thread */
 224 static void send_reply( union generic_reply *reply )
 225 {
 226     int ret;
 227
 228     if (!current->reply_size)
 229     {
 230         if ((ret = write( get_unix_fd( current->reply_fd ),
 231                           reply, sizeof(*reply) )) != sizeof(*reply)) goto error;
 232     }
 233     else
 234     {
 235         struct iovec vec[2];
 236
 237         vec[0].iov_base = (void *)reply;
 238         vec[0].iov_len  = sizeof(*reply);
 239         vec[1].iov_base = current->reply_data;
 240         vec[1].iov_len  = current->reply_size;
 241
 242         if ((ret = writev( get_unix_fd( current->reply_fd ), vec, 2 )) < sizeof(*reply)) goto error;
 243
 244         if ((current->reply_towrite = current->reply_size - (ret - sizeof(*reply))))
 245         {
 246             /* couldn't write it all, wait for POLLOUT */
 247             set_fd_events( current->reply_fd, POLLOUT );
 248             set_fd_events( current->request_fd, 0 );
 249             return;
 250         }
 251     }
 252     if (current->reply_data)
 253     {
 254         free( current->reply_data );
 255         current->reply_data = NULL;
 256     }
 257     return;
 258
 259  error:
 260     if (ret >= 0)
 261         fatal_protocol_error( current, "partial write %d\n", ret );
 262     else if (errno == EPIPE)
 263         kill_thread( current, 0 );  /* normal death */
 264     else
 265         fatal_protocol_perror( current, "reply write" );
 266 }
 267
 268 /* call a request handler */
 269 static void call_req_handler( struct thread *thread )
 270 {
 271     union generic_reply reply;
 272     enum request req = thread->req.request_header.req;
 273
 274     current = thread;
 275     current->reply_size = 0;
 276     clear_error();
 277     memset( &reply, 0, sizeof(reply) );
 278
 279     if (debug_level) trace_request();
 280
 281     if (req < REQ_NB_REQUESTS)
 282     {
 283         req_handlers[req]( &current->req, &reply );
 284         if (current)
 285         {
 286             if (current->reply_fd)
 287             {
 288                 reply.reply_header.error = current->error;
 289                 reply.reply_header.reply_size = current->reply_size;
 290                 if (debug_level) trace_reply( req, &reply );
 291                 send_reply( &reply );
 292             }
 293             else fatal_protocol_error( current, "no reply fd for request %d\n", req );
 294         }
 295         current = NULL;
 296         return;
 297     }
 298     fatal_protocol_error( current, "bad request %d\n", req );
 299 }
 300
 301 /* read a request from a thread */
 302 void read_request( struct thread *thread )
 303 {
 304     int ret;
 305
 306     if (!thread->req_toread)  /* no pending request */
 307     {
 308         if ((ret = read( get_unix_fd( thread->request_fd ), &thread->req,
 309                          sizeof(thread->req) )) != sizeof(thread->req)) goto error;
 310         if (!(thread->req_toread = thread->req.request_header.request_size))
 311         {
 312             /* no data, handle request at once */
 313             call_req_handler( thread );
 314             return;
 315         }
 316         if (!(thread->req_data = malloc( thread->req_toread )))
 317             fatal_protocol_error( thread, "no memory for %d bytes request\n", thread->req_toread );
 318     }
 319
 320     /* read the variable sized data */
 321     for (;;)
 322     {
 323         ret = read( get_unix_fd( thread->request_fd ),
 324                     (char *)thread->req_data + thread->req.request_header.request_size
 325                       - thread->req_toread,
 326                     thread->req_toread );
 327         if (ret <= 0) break;
 328         if (!(thread->req_toread -= ret))
 329         {
 330             call_req_handler( thread );
 331             free( thread->req_data );
 332             thread->req_data = NULL;
 333             return;
 334         }
 335     }
 336
 337 error:
 338     if (!ret)  /* closed pipe */
 339         kill_thread( thread, 0 );
 340     else if (ret > 0)
 341         fatal_protocol_error( thread, "partial read %d\n", ret );
 342     else if (errno != EWOULDBLOCK && errno != EAGAIN)
 343         fatal_protocol_perror( thread, "read" );
 344 }
 345
 346 /* receive a file descriptor on the process socket */
 347 int receive_fd( struct process *process )
 348 {
 349     struct send_fd data;
 350     int fd, ret;
 351
 352 #ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 353     msghdr.msg_accrightslen = sizeof(int);
 354     msghdr.msg_accrights = (void *)&fd;
 355 #else  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 356     msghdr.msg_control    = &cmsg;
 357     msghdr.msg_controllen = sizeof(cmsg.header) + sizeof(fd);
 358     cmsg.fd = -1;
 359 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 360
 361     myiovec.iov_base = (void *)&data;
 362     myiovec.iov_len  = sizeof(data);
 363
 364     ret = recvmsg( get_unix_fd( process->msg_fd ), &msghdr, 0 );
 365 #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 366     fd = cmsg.fd;
 367 #endif
 368
 369     if (ret == sizeof(data))
 370     {
 371         struct thread *thread;
 372
 373         if (data.tid) thread = get_thread_from_id( data.tid );
 374         else thread = (struct thread *)grab_object( get_process_first_thread( process ));
 375
 376         if (!thread || thread->process != process || thread->state == TERMINATED)
 377         {
 378             if (debug_level)
 379                 fprintf( stderr, "%04x: *fd* %d <- %d bad thread id\n",
 380                          data.tid, data.fd, fd );
 381             close( fd );
 382         }
 383         else
 384         {
 385             if (debug_level)
 386                 fprintf( stderr, "%04x: *fd* %d <- %d\n",
 387                          thread->id, data.fd, fd );
 388             thread_add_inflight_fd( thread, data.fd, fd );
 389         }
 390         if (thread) release_object( thread );
 391         return 0;
 392     }
 393
 394     if (ret >= 0)
 395     {
 396         if (ret > 0)
 397             fprintf( stderr, "Protocol error: process %p: partial recvmsg %d for fd\n",
 398                      process, ret );
 399         kill_process( process, NULL, 1 );
 400     }
 401     else
 402     {
 403         if (errno != EWOULDBLOCK && errno != EAGAIN)
 404         {
 405             fprintf( stderr, "Protocol error: process %p: ", process );
 406             perror( "recvmsg" );
 407             kill_process( process, NULL, 1 );
 408         }
 409     }
 410     return -1;
 411 }
 412
 413 /* send an fd to a client */
 414 int send_client_fd( struct process *process, int fd, obj_handle_t handle )
 415 {
 416     int ret;
 417
 418     if (debug_level)
 419         fprintf( stderr, "%04x: *fd* %p -> %d\n",
 420                  current ? current->id : process->id, handle, fd );
 421
 422 #ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 423     msghdr.msg_accrightslen = sizeof(fd);
 424     msghdr.msg_accrights = (void *)&fd;
 425 #else  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 426     msghdr.msg_control    = &cmsg;
 427     msghdr.msg_controllen = sizeof(cmsg.header) + sizeof(fd);
 428     cmsg.fd = fd;
 429 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 430
 431     myiovec.iov_base = (void *)&handle;
 432     myiovec.iov_len  = sizeof(handle);
 433
 434     ret = sendmsg( get_unix_fd( process->msg_fd ), &msghdr, 0 );
 435
 436     if (ret == sizeof(handle)) return 0;
 437
 438     if (ret >= 0)
 439     {
 440         fprintf( stderr, "Protocol error: process %p: partial sendmsg %d\n", process, ret );
 441         kill_process( process, NULL, 1 );
 442     }
 443     else if (errno == EPIPE)
 444     {
 445         kill_process( process, NULL, 0 );
 446     }
 447     else
 448     {
 449         fprintf( stderr, "Protocol error: process %p: ", process );
 450         perror( "sendmsg" );
 451         kill_process( process, NULL, 1 );
 452     }
 453     return -1;
 454 }
 455
 456 /* get current tick count to return to client */
 457 unsigned int get_tick_count(void)
 458 {
 459     struct timeval t;
 460     gettimeofday( &t, NULL );
 461     return ((t.tv_sec - server_start_time) * 1000) + (t.tv_usec / 1000);
 462 }
 463
 464 static void master_socket_dump( struct object *obj, int verbose )
 465 {
 466     struct master_socket *sock = (struct master_socket *)obj;
 467     assert( obj->ops == &master_socket_ops );
 468     fprintf( stderr, "Master socket fd=%p\n", sock->fd );
 469 }
 470
 471 static void master_socket_destroy( struct object *obj )
 472 {
 473     struct master_socket *sock = (struct master_socket *)obj;
 474     assert( obj->ops == &master_socket_ops );
 475     release_object( sock->fd );
 476 }
 477
 478 /* handle a socket event */
 479 static void master_socket_poll_event( struct fd *fd, int event )
 480 {
 481     struct master_socket *sock = get_fd_user( fd );
 482     assert( master_socket->obj.ops == &master_socket_ops );
 483
 484     assert( sock == master_socket );  /* there is only one master socket */
 485
 486     if (event & (POLLERR | POLLHUP))
 487     {
 488         /* this is not supposed to happen */
 489         fprintf( stderr, "wineserver: Error on master socket\n" );
 490         release_object( sock );
 491     }
 492     else if (event & POLLIN)
 493     {
 494         struct sockaddr_un dummy;
 495         unsigned int len = sizeof(dummy);
 496         int client = accept( get_unix_fd( master_socket->fd ), (struct sockaddr *) &dummy, &len );
 497         if (client == -1) return;
 498         if (sock->timeout)
 499         {
 500             remove_timeout_user( sock->timeout );
 501             sock->timeout = NULL;
 502         }
 503         fcntl( client, F_SETFL, O_NONBLOCK );
 504         create_process( client );
 505     }
 506 }
 507
 508 /* remove the socket upon exit */
 509 static void socket_cleanup(void)
 510 {
 511     static int do_it_once;
 512     if (!do_it_once++) unlink( server_socket_name );
 513 }
 514
 515 /* create a directory and check its permissions */
 516 static void create_dir( const char *name, struct stat *st )
 517 {
 518     if (lstat( name, st ) == -1)
 519     {
 520         if (errno != ENOENT) fatal_perror( "lstat %s", name );
 521         if (mkdir( name, 0700 ) == -1 && errno != EEXIST) fatal_perror( "mkdir %s", name );
 522         if (lstat( name, st ) == -1) fatal_perror( "lstat %s", name );
 523     }
 524     if (!S_ISDIR(st->st_mode)) fatal_error( "%s is not a directory\n", name );
 525     if (st->st_uid != getuid()) fatal_error( "%s is not owned by you\n", name );
 526     if (st->st_mode & 077) fatal_error( "%s must not be accessible by other users\n", name );
 527 }
 528
 529 /* create the server directory and chdir to it */
 530 static void create_server_dir(void)
 531 {
 532     char *p, *server_dir;
 533     struct stat st, st2;
 534
 535     if (!(server_dir = strdup( wine_get_server_dir() ))) fatal_error( "out of memory\n" );
 536
 537     /* first create the base directory if needed */
 538
 539     p = strrchr( server_dir, '/' );
 540     *p = 0;
 541     create_dir( server_dir, &st );
 542
 543     /* now create the server directory */
 544
 545     *p = '/';
 546     create_dir( server_dir, &st );
 547
 548     if (chdir( server_dir ) == -1) fatal_perror( "chdir %s", server_dir );
 549     if (stat( ".", &st2 ) == -1) fatal_perror( "stat %s", server_dir );
 550     if (st.st_dev != st2.st_dev || st.st_ino != st2.st_ino)
 551         fatal_error( "chdir did not end up in %s\n", server_dir );
 552
 553     free( server_dir );
 554 }
 555
 556 /* create the lock file and return its file descriptor */
 557 static int create_server_lock(void)
 558 {
 559     struct stat st;
 560     int fd;
 561
 562     if (lstat( server_lock_name, &st ) == -1)
 563     {
 564         if (errno != ENOENT)
 565             fatal_perror( "lstat %s/%s", wine_get_server_dir(), server_lock_name );
 566     }
 567     else
 568     {
 569         if (!S_ISREG(st.st_mode))
 570             fatal_error( "%s/%s is not a regular file\n", wine_get_server_dir(), server_lock_name );
 571     }
 572
 573     if ((fd = open( server_lock_name, O_CREAT|O_TRUNC|O_WRONLY, 0600 )) == -1)
 574         fatal_perror( "error creating %s/%s", wine_get_server_dir(), server_lock_name );
 575     return fd;
 576 }
 577
 578 /* wait for the server lock */
 579 int wait_for_lock(void)
 580 {
 581     int fd, r;
 582     struct flock fl;
 583
 584     create_server_dir();
 585     fd = create_server_lock();
 586
 587     fl.l_type   = F_WRLCK;
 588     fl.l_whence = SEEK_SET;
 589     fl.l_start  = 0;
 590     fl.l_len    = 1;
 591     r = fcntl( fd, F_SETLKW, &fl );
 592     close(fd);
 593
 594     return r;
 595 }
 596
 597 /* kill the wine server holding the lock */
 598 int kill_lock_owner( int sig )
 599 {
 600     int fd, i, ret = 0;
 601     pid_t pid = 0;
 602     struct flock fl;
 603
 604     create_server_dir();
 605     fd = create_server_lock();
 606
 607     for (i = 0; i < 10; i++)
 608     {
 609         fl.l_type   = F_WRLCK;
 610         fl.l_whence = SEEK_SET;
 611         fl.l_start  = 0;
 612         fl.l_len    = 1;
 613         if (fcntl( fd, F_GETLK, &fl ) == -1) goto done;
 614         if (fl.l_type != F_WRLCK) goto done;  /* the file is not locked */
 615         if (!pid)  /* first time around */
 616         {
 617             if (!(pid = fl.l_pid)) goto done;  /* shouldn't happen */
 618             if (sig == -1)
 619             {
 620                 if (kill( pid, SIGINT ) == -1) goto done;
 621                 kill( pid, SIGCONT );
 622                 ret = 1;
 623             }
 624             else  /* just send the specified signal and return */
 625             {
 626                 ret = (kill( pid, sig ) != -1);
 627                 goto done;
 628             }
 629         }
 630         else if (fl.l_pid != pid) goto done;  /* no longer the same process */
 631         sleep( 1 );
 632     }
 633     /* waited long enough, now kill it */
 634     kill( pid, SIGKILL );
 635
 636  done:
 637     close( fd );
 638     return ret;
 639 }
 640
 641 /* acquire the main server lock */
 642 static void acquire_lock(void)
 643 {
 644     struct sockaddr_un addr;
 645     struct stat st;
 646     struct flock fl;
 647     int fd, slen, got_lock = 0;
 648
 649     fd = create_server_lock();
 650
 651     fl.l_type   = F_WRLCK;
 652     fl.l_whence = SEEK_SET;
 653     fl.l_start  = 0;
 654     fl.l_len    = 1;
 655     if (fcntl( fd, F_SETLK, &fl ) != -1)
 656     {
 657         /* check for crashed server */
 658         if (stat( server_socket_name, &st ) != -1 &&   /* there is a leftover socket */
 659             stat( "core", &st ) != -1 && st.st_size)   /* and there is a non-empty core file */
 660         {
 661             fprintf( stderr,
 662                      "Warning: a previous instance of the wine server seems to have crashed.\n"
 663                      "Please run 'gdb %s %s/core',\n"
 664                      "type 'backtrace' at the gdb prompt and report the results. Thanks.\n\n",
 665                      server_argv0, wine_get_server_dir() );
 666         }
 667         unlink( server_socket_name ); /* we got the lock, we can safely remove the socket */
 668         got_lock = 1;
 669         /* in that case we reuse fd without closing it, this ensures
 670          * that we hold the lock until the process exits */
 671     }
 672     else
 673     {
 674         switch(errno)
 675         {
 676         case ENOLCK:
 677             break;
 678         case EACCES:
 679             /* check whether locks work at all on this file system */
 680             if (fcntl( fd, F_GETLK, &fl ) == -1) break;
 681             /* fall through */
 682         case EAGAIN:
 683             exit(2); /* we didn't get the lock, exit with special status */
 684         default:
 685             fatal_perror( "fcntl %s/%s", wine_get_server_dir(), server_lock_name );
 686         }
 687         /* it seems we can't use locks on this fs, so we will use the socket existence as lock */
 688         close( fd );
 689     }
 690
 691     if ((fd = socket( AF_UNIX, SOCK_STREAM, 0 )) == -1) fatal_perror( "socket" );
 692     addr.sun_family = AF_UNIX;
 693     strcpy( addr.sun_path, server_socket_name );
 694     slen = sizeof(addr) - sizeof(addr.sun_path) + strlen(addr.sun_path) + 1;
 695 #ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN
 696     addr.sun_len = slen;
 697 #endif
 698     if (bind( fd, (struct sockaddr *)&addr, slen ) == -1)
 699     {
 700         if ((errno == EEXIST) || (errno == EADDRINUSE))
 701         {
 702             if (got_lock)
 703                 fatal_error( "couldn't bind to the socket even though we hold the lock\n" );
 704             exit(2); /* we didn't get the lock, exit with special status */
 705         }
 706         fatal_perror( "bind" );
 707     }
 708     atexit( socket_cleanup );
 709     chmod( server_socket_name, 0600 );  /* make sure no other user can connect */
 710     if (listen( fd, 5 ) == -1) fatal_perror( "listen" );
 711
 712     if (!(master_socket = alloc_object( &master_socket_ops )) ||
 713         !(master_socket->fd = create_anonymous_fd( &master_socket_fd_ops, fd, &master_socket->obj )))
 714         fatal_error( "out of memory\n" );
 715     master_socket->timeout = NULL;
 716     set_fd_events( master_socket->fd, POLLIN );
 717 }
 718
 719 /* open the master server socket and start waiting for new clients */
 720 void open_master_socket(void)
 721 {
 722     int fd, pid, status, sync_pipe[2];
 723     char dummy;
 724
 725     /* make sure no request is larger than the maximum size */
 726     assert( sizeof(union generic_request) == sizeof(struct request_max_size) );
 727     assert( sizeof(union generic_reply) == sizeof(struct request_max_size) );
 728
 729     create_server_dir();
 730
 731     if (!foreground)
 732     {
 733         if (pipe( sync_pipe ) == -1) fatal_perror( "pipe" );
 734         pid = fork();
 735         switch( pid )
 736         {
 737         case 0:  /* child */
 738             setsid();
 739             close( sync_pipe[0] );
 740
 741             acquire_lock();
 742
 743             /* close stdin and stdout */
 744             if ((fd = open( "/dev/null", O_RDWR )) != -1)
 745             {
 746                 dup2( fd, 0 );
 747                 dup2( fd, 1 );
 748                 close( fd );
 749             }
 750
 751             /* signal parent */
 752             write( sync_pipe[1], &dummy, 1 );
 753             close( sync_pipe[1] );
 754             break;
 755
 756         case -1:
 757             fatal_perror( "fork" );
 758             break;
 759
 760         default:  /* parent */
 761             close( sync_pipe[1] );
 762
 763             /* wait for child to signal us and then exit */
 764             if (read( sync_pipe[0], &dummy, 1 ) == 1) _exit(0);
 765
 766             /* child terminated, propagate exit status */
 767             wait4( pid, &status, 0, NULL );
 768             if (WIFEXITED(status)) _exit( WEXITSTATUS(status) );
 769             _exit(1);
 770         }
 771     }
 772     else  /* remain in the foreground */
 773     {
 774         acquire_lock();
 775     }
 776
 777     /* setup msghdr structure constant fields */
 778     msghdr.msg_name    = NULL;
 779     msghdr.msg_namelen = 0;
 780     msghdr.msg_iov     = &myiovec;
 781     msghdr.msg_iovlen  = 1;
 782
 783     /* init startup time */
 784     server_start_time = time(NULL);
 785 }
 786
 787 /* master socket timer expiration handler */
 788 static void close_socket_timeout( void *arg )
 789 {
 790     master_socket->timeout = NULL;
 791     flush_registry();
 792
 793     /* if a new client is waiting, we keep on running */
 794     if (check_fd_events( master_socket->fd, POLLIN )) return;
 795
 796     if (debug_level) fprintf( stderr, "wineserver: exiting (pid=%ld)\n", (long) getpid() );
 797
 798 #ifdef DEBUG_OBJECTS
 799     /* shut down everything properly */
 800     release_object( master_socket );
 801     close_signals();
 802     close_global_handles();
 803     close_registry();
 804     close_directories();
 805     dump_objects();  /* dump any remaining objects */
 806 #else
 807     exit(0);
 808 #endif
 809 }
 810
 811 /* close the master socket and stop waiting for new clients */
 812 void close_master_socket(void)
 813 {
 814     struct timeval when;
 815
 816     if (master_socket_timeout == -1) return;  /* just keep running forever */
 817
 818     if (master_socket_timeout)
 819     {
 820         gettimeofday( &when, NULL );
 821         add_timeout( &when, master_socket_timeout * 1000 );
 822         master_socket->timeout = add_timeout_user( &when, close_socket_timeout, NULL );
 823     }
 824     else close_socket_timeout( NULL );  /* close it right away */
 825 }
 826
 827 /* lock/unlock the master socket to stop accepting new clients */
 828 void lock_master_socket( int locked )
 829 {
 830     set_fd_events( master_socket->fd, locked ? 0 : POLLIN );
 831 }