server/request.c

   1 /*
   2  * Server-side request handling
   3  *
   4  * Copyright (C) 1998 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <assert.h>
  25 #include <errno.h>
  26 #include <fcntl.h>
  27 #ifdef HAVE_PWD_H
  28 #include <pwd.h>
  29 #endif
  30 #include <signal.h>
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <stdarg.h>
  34 #include <string.h>
  35 #include <sys/stat.h>
  36 #include <sys/time.h>
  37 #include <sys/types.h>
  38 #ifdef HAVE_SYS_SOCKET_H
  39 # include <sys/socket.h>
  40 #endif
  41 #ifdef HAVE_SYS_WAIT_H
  42 # include <sys/wait.h>
  43 #endif
  44 #ifdef HAVE_SYS_UIO_H
  45 #include <sys/uio.h>
  46 #endif
  47 #ifdef HAVE_SYS_UN_H
  48 #include <sys/un.h>
  49 #endif
  50 #include <unistd.h>
  51 #ifdef HAVE_POLL_H
  52 #include <poll.h>
  53 #endif
  54
  55 #include "ntstatus.h"
  56 #define WIN32_NO_STATUS
  57 #include "windef.h"
  58 #include "winbase.h"
  59 #include "wincon.h"
  60 #include "winternl.h"
  61 #include "wine/library.h"
  62
  63 #include "file.h"
  64 #include "process.h"
  65 #define WANT_REQUEST_HANDLERS
  66 #include "request.h"
  67
  68 /* Some versions of glibc don't define this */
  69 #ifndef SCM_RIGHTS
  70 #define SCM_RIGHTS 1
  71 #endif
  72
  73 /* path names for server master Unix socket */
  74 static const char * const server_socket_name = "socket";   /* name of the socket file */
  75 static const char * const server_lock_name = "lock";       /* name of the server lock file */
  76
  77 struct master_socket
  78 {
  79     struct object        obj;        /* object header */
  80     struct fd           *fd;         /* file descriptor of the master socket */
  81     struct timeout_user *timeout;    /* timeout on last process exit */
  82 };
  83
  84 static void master_socket_dump( struct object *obj, int verbose );
  85 static void master_socket_destroy( struct object *obj );
  86 static void master_socket_poll_event( struct fd *fd, int event );
  87
  88 static const struct object_ops master_socket_ops =
  89 {
  90     sizeof(struct master_socket),  /* size */
  91     master_socket_dump,            /* dump */
  92     no_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_map_access,                 /* map_access */
  99     no_lookup_name,                /* lookup_name */
 100     no_close_handle,               /* close_handle */
 101     master_socket_destroy          /* destroy */
 102 };
 103
 104 static const struct fd_ops master_socket_fd_ops =
 105 {
 106     NULL,                          /* get_poll_events */
 107     master_socket_poll_event,      /* poll_event */
 108     no_flush,                      /* flush */
 109     no_get_file_info,              /* get_file_info */
 110     no_queue_async,                /* queue_async */
 111     no_cancel_async                /* cancel_async */
 112 };
 113
 114
 115 struct thread *current = NULL;  /* thread handling the current request */
 116 unsigned int global_error = 0;  /* global error code for when no thread is current */
 117 struct timeval server_start_time = { 0, 0 };  /* server startup time */
 118
 119 static struct master_socket *master_socket;  /* the master socket object */
 120 static int force_shutdown;
 121
 122 /* socket communication static structures */
 123 static struct iovec myiovec;
 124 static struct msghdr msghdr;
 125 #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 126 struct cmsg_fd
 127 {
 128     struct
 129     {
 130         size_t len;   /* size of structure */
 131         int    level; /* SOL_SOCKET */
 132         int    type;  /* SCM_RIGHTS */
 133     } header;
 134     int fd;           /* fd to pass */
 135 };
 136 static struct cmsg_fd cmsg = { { sizeof(cmsg.header) + sizeof(cmsg.fd), SOL_SOCKET, SCM_RIGHTS }, -1 };
 137 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 138
 139 /* complain about a protocol error and terminate the client connection */
 140 void fatal_protocol_error( struct thread *thread, const char *err, ... )
 141 {
 142     va_list args;
 143
 144     va_start( args, err );
 145     fprintf( stderr, "Protocol error:%04x: ", thread->id );
 146     vfprintf( stderr, err, args );
 147     va_end( args );
 148     thread->exit_code = 1;
 149     kill_thread( thread, 1 );
 150 }
 151
 152 /* complain about a protocol error and terminate the client connection */
 153 void fatal_protocol_perror( struct thread *thread, const char *err, ... )
 154 {
 155     va_list args;
 156
 157     va_start( args, err );
 158     fprintf( stderr, "Protocol error:%04x: ", thread->id );
 159     vfprintf( stderr, err, args );
 160     perror( " " );
 161     va_end( args );
 162     thread->exit_code = 1;
 163     kill_thread( thread, 1 );
 164 }
 165
 166 /* die on a fatal error */
 167 void fatal_error( const char *err, ... )
 168 {
 169     va_list args;
 170
 171     va_start( args, err );
 172     fprintf( stderr, "wineserver: " );
 173     vfprintf( stderr, err, args );
 174     va_end( args );
 175     exit(1);
 176 }
 177
 178 /* die on a fatal error */
 179 void fatal_perror( const char *err, ... )
 180 {
 181     va_list args;
 182
 183     va_start( args, err );
 184     fprintf( stderr, "wineserver: " );
 185     vfprintf( stderr, err, args );
 186     perror( " " );
 187     va_end( args );
 188     exit(1);
 189 }
 190
 191 /* allocate the reply data */
 192 void *set_reply_data_size( data_size_t size )
 193 {
 194     assert( size <= get_reply_max_size() );
 195     if (size && !(current->reply_data = mem_alloc( size ))) size = 0;
 196     current->reply_size = size;
 197     return current->reply_data;
 198 }
 199
 200 /* write the remaining part of the reply */
 201 void write_reply( struct thread *thread )
 202 {
 203     int ret;
 204
 205     if ((ret = write( get_unix_fd( thread->reply_fd ),
 206                       (char *)thread->reply_data + thread->reply_size - thread->reply_towrite,
 207                       thread->reply_towrite )) >= 0)
 208     {
 209         if (!(thread->reply_towrite -= ret))
 210         {
 211             free( thread->reply_data );
 212             thread->reply_data = NULL;
 213             /* sent everything, can go back to waiting for requests */
 214             set_fd_events( thread->request_fd, POLLIN );
 215             set_fd_events( thread->reply_fd, 0 );
 216         }
 217         return;
 218     }
 219     if (errno == EPIPE)
 220         kill_thread( thread, 0 );  /* normal death */
 221     else if (errno != EWOULDBLOCK && errno != EAGAIN)
 222         fatal_protocol_perror( thread, "reply write" );
 223 }
 224
 225 /* send a reply to the current thread */
 226 static void send_reply( union generic_reply *reply )
 227 {
 228     int ret;
 229
 230     if (!current->reply_size)
 231     {
 232         if ((ret = write( get_unix_fd( current->reply_fd ),
 233                           reply, sizeof(*reply) )) != sizeof(*reply)) goto error;
 234     }
 235     else
 236     {
 237         struct iovec vec[2];
 238
 239         vec[0].iov_base = (void *)reply;
 240         vec[0].iov_len  = sizeof(*reply);
 241         vec[1].iov_base = current->reply_data;
 242         vec[1].iov_len  = current->reply_size;
 243
 244         if ((ret = writev( get_unix_fd( current->reply_fd ), vec, 2 )) < sizeof(*reply)) goto error;
 245
 246         if ((current->reply_towrite = current->reply_size - (ret - sizeof(*reply))))
 247         {
 248             /* couldn't write it all, wait for POLLOUT */
 249             set_fd_events( current->reply_fd, POLLOUT );
 250             set_fd_events( current->request_fd, 0 );
 251             return;
 252         }
 253     }
 254     if (current->reply_data)
 255     {
 256         free( current->reply_data );
 257         current->reply_data = NULL;
 258     }
 259     return;
 260
 261  error:
 262     if (ret >= 0)
 263         fatal_protocol_error( current, "partial write %d\n", ret );
 264     else if (errno == EPIPE)
 265         kill_thread( current, 0 );  /* normal death */
 266     else
 267         fatal_protocol_perror( current, "reply write" );
 268 }
 269
 270 /* call a request handler */
 271 static void call_req_handler( struct thread *thread )
 272 {
 273     union generic_reply reply;
 274     enum request req = thread->req.request_header.req;
 275
 276     current = thread;
 277     current->reply_size = 0;
 278     clear_error();
 279     memset( &reply, 0, sizeof(reply) );
 280
 281     if (debug_level) trace_request();
 282
 283     if (req < REQ_NB_REQUESTS)
 284         req_handlers[req]( &current->req, &reply );
 285     else
 286         set_error( STATUS_NOT_IMPLEMENTED );
 287
 288     if (current)
 289     {
 290         if (current->reply_fd)
 291         {
 292             reply.reply_header.error = current->error;
 293             reply.reply_header.reply_size = current->reply_size;
 294             if (debug_level) trace_reply( req, &reply );
 295             send_reply( &reply );
 296         }
 297         else
 298         {
 299             current->exit_code = 1;
 300             kill_thread( current, 1 );  /* no way to continue without reply fd */
 301         }
 302     }
 303     current = NULL;
 304 }
 305
 306 /* read a request from a thread */
 307 void read_request( struct thread *thread )
 308 {
 309     int ret;
 310
 311     if (!thread->req_toread)  /* no pending request */
 312     {
 313         if ((ret = read( get_unix_fd( thread->request_fd ), &thread->req,
 314                          sizeof(thread->req) )) != sizeof(thread->req)) goto error;
 315         if (!(thread->req_toread = thread->req.request_header.request_size))
 316         {
 317             /* no data, handle request at once */
 318             call_req_handler( thread );
 319             return;
 320         }
 321         if (!(thread->req_data = malloc( thread->req_toread )))
 322         {
 323             fatal_protocol_error( thread, "no memory for %u bytes request %d\n",
 324                                   thread->req_toread, thread->req.request_header.req );
 325             return;
 326         }
 327     }
 328
 329     /* read the variable sized data */
 330     for (;;)
 331     {
 332         ret = read( get_unix_fd( thread->request_fd ),
 333                     (char *)thread->req_data + thread->req.request_header.request_size
 334                       - thread->req_toread,
 335                     thread->req_toread );
 336         if (ret <= 0) break;
 337         if (!(thread->req_toread -= ret))
 338         {
 339             call_req_handler( thread );
 340             free( thread->req_data );
 341             thread->req_data = NULL;
 342             return;
 343         }
 344     }
 345
 346 error:
 347     if (!ret)  /* closed pipe */
 348         kill_thread( thread, 0 );
 349     else if (ret > 0)
 350         fatal_protocol_error( thread, "partial read %d\n", ret );
 351     else if (errno != EWOULDBLOCK && errno != EAGAIN)
 352         fatal_protocol_perror( thread, "read" );
 353 }
 354
 355 /* receive a file descriptor on the process socket */
 356 int receive_fd( struct process *process )
 357 {
 358     struct send_fd data;
 359     int fd, ret;
 360
 361 #ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 362     msghdr.msg_accrightslen = sizeof(int);
 363     msghdr.msg_accrights = (void *)&fd;
 364 #else  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 365     msghdr.msg_control    = &cmsg;
 366     msghdr.msg_controllen = sizeof(cmsg.header) + sizeof(fd);
 367     cmsg.fd = -1;
 368 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 369
 370     myiovec.iov_base = (void *)&data;
 371     myiovec.iov_len  = sizeof(data);
 372
 373     ret = recvmsg( get_unix_fd( process->msg_fd ), &msghdr, 0 );
 374 #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 375     fd = cmsg.fd;
 376 #endif
 377
 378     if (ret == sizeof(data))
 379     {
 380         struct thread *thread;
 381
 382         if (data.tid) thread = get_thread_from_id( data.tid );
 383         else thread = (struct thread *)grab_object( get_process_first_thread( process ));
 384
 385         if (!thread || thread->process != process || thread->state == TERMINATED)
 386         {
 387             if (debug_level)
 388                 fprintf( stderr, "%04x: *fd* %d <- %d bad thread id\n",
 389                          data.tid, data.fd, fd );
 390             close( fd );
 391         }
 392         else
 393         {
 394             if (debug_level)
 395                 fprintf( stderr, "%04x: *fd* %d <- %d\n",
 396                          thread->id, data.fd, fd );
 397             thread_add_inflight_fd( thread, data.fd, fd );
 398         }
 399         if (thread) release_object( thread );
 400         return 0;
 401     }
 402
 403     if (!ret)
 404     {
 405         kill_process( process, 0 );
 406     }
 407     else if (ret > 0)
 408     {
 409         fprintf( stderr, "Protocol error: process %04x: partial recvmsg %d for fd\n",
 410                  process->id, ret );
 411         kill_process( process, 1 );
 412     }
 413     else
 414     {
 415         if (errno != EWOULDBLOCK && errno != EAGAIN)
 416         {
 417             fprintf( stderr, "Protocol error: process %04x: ", process->id );
 418             perror( "recvmsg" );
 419             kill_process( process, 1 );
 420         }
 421     }
 422     return -1;
 423 }
 424
 425 /* send an fd to a client */
 426 int send_client_fd( struct process *process, int fd, obj_handle_t handle )
 427 {
 428     int ret;
 429
 430     if (debug_level)
 431         fprintf( stderr, "%04x: *fd* %p -> %d\n",
 432                  current ? current->id : process->id, handle, fd );
 433
 434 #ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 435     msghdr.msg_accrightslen = sizeof(fd);
 436     msghdr.msg_accrights = (void *)&fd;
 437 #else  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 438     msghdr.msg_control    = &cmsg;
 439     msghdr.msg_controllen = sizeof(cmsg.header) + sizeof(fd);
 440     cmsg.fd = fd;
 441 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 442
 443     myiovec.iov_base = (void *)&handle;
 444     myiovec.iov_len  = sizeof(handle);
 445
 446     ret = sendmsg( get_unix_fd( process->msg_fd ), &msghdr, 0 );
 447
 448     if (ret == sizeof(handle)) return 0;
 449
 450     if (ret >= 0)
 451     {
 452         fprintf( stderr, "Protocol error: process %04x: partial sendmsg %d\n", process->id, ret );
 453         kill_process( process, 1 );
 454     }
 455     else if (errno == EPIPE)
 456     {
 457         kill_process( process, 0 );
 458     }
 459     else
 460     {
 461         fprintf( stderr, "Protocol error: process %04x: ", process->id );
 462         perror( "sendmsg" );
 463         kill_process( process, 1 );
 464     }
 465     return -1;
 466 }
 467
 468 /* get current tick count to return to client */
 469 unsigned int get_tick_count(void)
 470 {
 471     return ((current_time.tv_sec - server_start_time.tv_sec) * 1000) +
 472            ((current_time.tv_usec - server_start_time.tv_usec) / 1000);
 473 }
 474
 475 static void master_socket_dump( struct object *obj, int verbose )
 476 {
 477     struct master_socket *sock = (struct master_socket *)obj;
 478     assert( obj->ops == &master_socket_ops );
 479     fprintf( stderr, "Master socket fd=%p\n", sock->fd );
 480 }
 481
 482 static void master_socket_destroy( struct object *obj )
 483 {
 484     struct master_socket *sock = (struct master_socket *)obj;
 485     assert( obj->ops == &master_socket_ops );
 486     release_object( sock->fd );
 487 }
 488
 489 /* handle a socket event */
 490 static void master_socket_poll_event( struct fd *fd, int event )
 491 {
 492     struct master_socket *sock = get_fd_user( fd );
 493     assert( master_socket->obj.ops == &master_socket_ops );
 494
 495     assert( sock == master_socket );  /* there is only one master socket */
 496
 497     if (event & (POLLERR | POLLHUP))
 498     {
 499         /* this is not supposed to happen */
 500         fprintf( stderr, "wineserver: Error on master socket\n" );
 501         set_fd_events( sock->fd, -1 );
 502     }
 503     else if (event & POLLIN)
 504     {
 505         struct sockaddr_un dummy;
 506         unsigned int len = sizeof(dummy);
 507         int client = accept( get_unix_fd( master_socket->fd ), (struct sockaddr *) &dummy, &len );
 508         if (client == -1) return;
 509         if (sock->timeout)
 510         {
 511             remove_timeout_user( sock->timeout );
 512             sock->timeout = NULL;
 513         }
 514         fcntl( client, F_SETFL, O_NONBLOCK );
 515         create_process( client, NULL, 0 );
 516     }
 517 }
 518
 519 /* remove the socket upon exit */
 520 static void socket_cleanup(void)
 521 {
 522     static int do_it_once;
 523     if (!do_it_once++) unlink( server_socket_name );
 524 }
 525
 526 /* create a directory and check its permissions */
 527 static void create_dir( const char *name, struct stat *st )
 528 {
 529     if (lstat( name, st ) == -1)
 530     {
 531         if (errno != ENOENT) fatal_perror( "lstat %s", name );
 532         if (mkdir( name, 0700 ) == -1 && errno != EEXIST) fatal_perror( "mkdir %s", name );
 533         if (lstat( name, st ) == -1) fatal_perror( "lstat %s", name );
 534     }
 535     if (!S_ISDIR(st->st_mode)) fatal_error( "%s is not a directory\n", name );
 536     if (st->st_uid != getuid()) fatal_error( "%s is not owned by you\n", name );
 537     if (st->st_mode & 077) fatal_error( "%s must not be accessible by other users\n", name );
 538 }
 539
 540 /* create the server directory and chdir to it */
 541 static void create_server_dir( const char *dir )
 542 {
 543     char *p, *server_dir;
 544     struct stat st, st2;
 545
 546     if (!(server_dir = strdup( dir ))) fatal_error( "out of memory\n" );
 547
 548     /* first create the base directory if needed */
 549
 550     p = strrchr( server_dir, '/' );
 551     *p = 0;
 552     create_dir( server_dir, &st );
 553
 554     /* now create the server directory */
 555
 556     *p = '/';
 557     create_dir( server_dir, &st );
 558
 559     if (chdir( server_dir ) == -1) fatal_perror( "chdir %s", server_dir );
 560     if (stat( ".", &st2 ) == -1) fatal_perror( "stat %s", server_dir );
 561     if (st.st_dev != st2.st_dev || st.st_ino != st2.st_ino)
 562         fatal_error( "chdir did not end up in %s\n", server_dir );
 563
 564     free( server_dir );
 565 }
 566
 567 /* create the lock file and return its file descriptor */
 568 static int create_server_lock(void)
 569 {
 570     struct stat st;
 571     int fd;
 572
 573     if (lstat( server_lock_name, &st ) == -1)
 574     {
 575         if (errno != ENOENT)
 576             fatal_perror( "lstat %s/%s", wine_get_server_dir(), server_lock_name );
 577     }
 578     else
 579     {
 580         if (!S_ISREG(st.st_mode))
 581             fatal_error( "%s/%s is not a regular file\n", wine_get_server_dir(), server_lock_name );
 582     }
 583
 584     if ((fd = open( server_lock_name, O_CREAT|O_TRUNC|O_WRONLY, 0600 )) == -1)
 585         fatal_perror( "error creating %s/%s", wine_get_server_dir(), server_lock_name );
 586     return fd;
 587 }
 588
 589 /* wait for the server lock */
 590 int wait_for_lock(void)
 591 {
 592     const char *server_dir = wine_get_server_dir();
 593     int fd, r;
 594     struct flock fl;
 595
 596     if (!server_dir) return 0;  /* no server dir, so no lock to wait on */
 597
 598     create_server_dir( server_dir );
 599     fd = create_server_lock();
 600
 601     fl.l_type   = F_WRLCK;
 602     fl.l_whence = SEEK_SET;
 603     fl.l_start  = 0;
 604     fl.l_len    = 1;
 605     r = fcntl( fd, F_SETLKW, &fl );
 606     close(fd);
 607
 608     return r;
 609 }
 610
 611 /* kill the wine server holding the lock */
 612 int kill_lock_owner( int sig )
 613 {
 614     const char *server_dir = wine_get_server_dir();
 615     int fd, i, ret = 0;
 616     pid_t pid = 0;
 617     struct flock fl;
 618
 619     if (!server_dir) return 0;  /* no server dir, nothing to do */
 620
 621     create_server_dir( server_dir );
 622     fd = create_server_lock();
 623
 624     for (i = 0; i < 10; i++)
 625     {
 626         fl.l_type   = F_WRLCK;
 627         fl.l_whence = SEEK_SET;
 628         fl.l_start  = 0;
 629         fl.l_len    = 1;
 630         if (fcntl( fd, F_GETLK, &fl ) == -1) goto done;
 631         if (fl.l_type != F_WRLCK) goto done;  /* the file is not locked */
 632         if (!pid)  /* first time around */
 633         {
 634             if (!(pid = fl.l_pid)) goto done;  /* shouldn't happen */
 635             if (sig == -1)
 636             {
 637                 if (kill( pid, SIGINT ) == -1) goto done;
 638                 kill( pid, SIGCONT );
 639                 ret = 1;
 640             }
 641             else  /* just send the specified signal and return */
 642             {
 643                 ret = (kill( pid, sig ) != -1);
 644                 goto done;
 645             }
 646         }
 647         else if (fl.l_pid != pid) goto done;  /* no longer the same process */
 648         sleep( 1 );
 649     }
 650     /* waited long enough, now kill it */
 651     kill( pid, SIGKILL );
 652
 653  done:
 654     close( fd );
 655     return ret;
 656 }
 657
 658 /* acquire the main server lock */
 659 static void acquire_lock(void)
 660 {
 661     struct sockaddr_un addr;
 662     struct stat st;
 663     struct flock fl;
 664     int fd, slen, got_lock = 0;
 665
 666     fd = create_server_lock();
 667
 668     fl.l_type   = F_WRLCK;
 669     fl.l_whence = SEEK_SET;
 670     fl.l_start  = 0;
 671     fl.l_len    = 1;
 672     if (fcntl( fd, F_SETLK, &fl ) != -1)
 673     {
 674         /* check for crashed server */
 675         if (stat( server_socket_name, &st ) != -1 &&   /* there is a leftover socket */
 676             stat( "core", &st ) != -1 && st.st_size)   /* and there is a non-empty core file */
 677         {
 678             fprintf( stderr,
 679                      "Warning: a previous instance of the wine server seems to have crashed.\n"
 680                      "Please run 'gdb %s %s/core',\n"
 681                      "type 'backtrace' at the gdb prompt and report the results. Thanks.\n\n",
 682                      server_argv0, wine_get_server_dir() );
 683         }
 684         unlink( server_socket_name ); /* we got the lock, we can safely remove the socket */
 685         got_lock = 1;
 686         /* in that case we reuse fd without closing it, this ensures
 687          * that we hold the lock until the process exits */
 688     }
 689     else
 690     {
 691         switch(errno)
 692         {
 693         case ENOLCK:
 694             break;
 695         case EACCES:
 696             /* check whether locks work at all on this file system */
 697             if (fcntl( fd, F_GETLK, &fl ) == -1) break;
 698             /* fall through */
 699         case EAGAIN:
 700             exit(2); /* we didn't get the lock, exit with special status */
 701         default:
 702             fatal_perror( "fcntl %s/%s", wine_get_server_dir(), server_lock_name );
 703         }
 704         /* it seems we can't use locks on this fs, so we will use the socket existence as lock */
 705         close( fd );
 706     }
 707
 708     if ((fd = socket( AF_UNIX, SOCK_STREAM, 0 )) == -1) fatal_perror( "socket" );
 709     addr.sun_family = AF_UNIX;
 710     strcpy( addr.sun_path, server_socket_name );
 711     slen = sizeof(addr) - sizeof(addr.sun_path) + strlen(addr.sun_path) + 1;
 712 #ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN
 713     addr.sun_len = slen;
 714 #endif
 715     if (bind( fd, (struct sockaddr *)&addr, slen ) == -1)
 716     {
 717         if ((errno == EEXIST) || (errno == EADDRINUSE))
 718         {
 719             if (got_lock)
 720                 fatal_error( "couldn't bind to the socket even though we hold the lock\n" );
 721             exit(2); /* we didn't get the lock, exit with special status */
 722         }
 723         fatal_perror( "bind" );
 724     }
 725     atexit( socket_cleanup );
 726     chmod( server_socket_name, 0600 );  /* make sure no other user can connect */
 727     if (listen( fd, 5 ) == -1) fatal_perror( "listen" );
 728
 729     if (!(master_socket = alloc_object( &master_socket_ops )) ||
 730         !(master_socket->fd = create_anonymous_fd( &master_socket_fd_ops, fd, &master_socket->obj )))
 731         fatal_error( "out of memory\n" );
 732     master_socket->timeout = NULL;
 733     set_fd_events( master_socket->fd, POLLIN );
 734     make_object_static( &master_socket->obj );
 735 }
 736
 737 /* open the master server socket and start waiting for new clients */
 738 void open_master_socket(void)
 739 {
 740     const char *server_dir = wine_get_server_dir();
 741     int fd, pid, status, sync_pipe[2];
 742     char dummy;
 743
 744     /* make sure no request is larger than the maximum size */
 745     assert( sizeof(union generic_request) == sizeof(struct request_max_size) );
 746     assert( sizeof(union generic_reply) == sizeof(struct request_max_size) );
 747
 748     if (!server_dir) fatal_error( "directory %s cannot be accessed\n", wine_get_config_dir() );
 749     create_server_dir( server_dir );
 750
 751     if (!foreground)
 752     {
 753         if (pipe( sync_pipe ) == -1) fatal_perror( "pipe" );
 754         pid = fork();
 755         switch( pid )
 756         {
 757         case 0:  /* child */
 758             setsid();
 759             close( sync_pipe[0] );
 760
 761             acquire_lock();
 762
 763             /* close stdin and stdout */
 764             if ((fd = open( "/dev/null", O_RDWR )) != -1)
 765             {
 766                 dup2( fd, 0 );
 767                 dup2( fd, 1 );
 768                 close( fd );
 769             }
 770
 771             /* signal parent */
 772             dummy = 0;
 773             write( sync_pipe[1], &dummy, 1 );
 774             close( sync_pipe[1] );
 775             break;
 776
 777         case -1:
 778             fatal_perror( "fork" );
 779             break;
 780
 781         default:  /* parent */
 782             close( sync_pipe[1] );
 783
 784             /* wait for child to signal us and then exit */
 785             if (read( sync_pipe[0], &dummy, 1 ) == 1) _exit(0);
 786
 787             /* child terminated, propagate exit status */
 788             wait4( pid, &status, 0, NULL );
 789             if (WIFEXITED(status)) _exit( WEXITSTATUS(status) );
 790             _exit(1);
 791         }
 792     }
 793     else  /* remain in the foreground */
 794     {
 795         acquire_lock();
 796     }
 797
 798     /* setup msghdr structure constant fields */
 799     msghdr.msg_name    = NULL;
 800     msghdr.msg_namelen = 0;
 801     msghdr.msg_iov     = &myiovec;
 802     msghdr.msg_iovlen  = 1;
 803
 804     /* init startup time */
 805     gettimeofday( &server_start_time, NULL );
 806 }
 807
 808 /* master socket timer expiration handler */
 809 static void close_socket_timeout( void *arg )
 810 {
 811     master_socket->timeout = NULL;
 812     flush_registry();
 813
 814     /* if a new client is waiting, we keep on running */
 815     if (!force_shutdown && check_fd_events( master_socket->fd, POLLIN )) return;
 816
 817     if (debug_level) fprintf( stderr, "wineserver: exiting (pid=%ld)\n", (long) getpid() );
 818
 819 #ifdef DEBUG_OBJECTS
 820     close_objects();  /* shut down everything properly */
 821 #endif
 822     exit( force_shutdown );
 823 }
 824
 825 /* close the master socket and stop waiting for new clients */
 826 void close_master_socket(void)
 827 {
 828     if (master_socket_timeout == -1) return;  /* just keep running forever */
 829
 830     if (master_socket_timeout)
 831     {
 832         struct timeval when = current_time;
 833         add_timeout( &when, master_socket_timeout * 1000 );
 834         master_socket->timeout = add_timeout_user( &when, close_socket_timeout, NULL );
 835     }
 836     else close_socket_timeout( NULL );  /* close it right away */
 837 }
 838
 839 /* forced shutdown, used for wineserver -k */
 840 void shutdown_master_socket(void)
 841 {
 842     force_shutdown = 1;
 843     master_socket_timeout = 0;
 844     if (master_socket->timeout)
 845     {
 846         remove_timeout_user( master_socket->timeout );
 847         close_socket_timeout( NULL );
 848     }
 849     set_fd_events( master_socket->fd, -1 ); /* stop waiting for new clients */
 850 }