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_open_file,                  /* open_file */
 101     no_close_handle,               /* close_handle */
 102     master_socket_destroy          /* destroy */
 103 };
 104
 105 static const struct fd_ops master_socket_fd_ops =
 106 {
 107     NULL,                          /* get_poll_events */
 108     master_socket_poll_event,      /* poll_event */
 109     no_flush,                      /* flush */
 110     no_get_file_info,              /* get_file_info */
 111     no_queue_async,                /* queue_async */
 112     no_cancel_async                /* cancel_async */
 113 };
 114
 115
 116 struct thread *current = NULL;  /* thread handling the current request */
 117 unsigned int global_error = 0;  /* global error code for when no thread is current */
 118 struct timeval server_start_time = { 0, 0 };  /* server startup time */
 119
 120 static struct master_socket *master_socket;  /* the master socket object */
 121 static int force_shutdown;
 122
 123 /* socket communication static structures */
 124 static struct iovec myiovec;
 125 static struct msghdr msghdr;
 126 #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 127 struct cmsg_fd
 128 {
 129     struct
 130     {
 131         size_t len;   /* size of structure */
 132         int    level; /* SOL_SOCKET */
 133         int    type;  /* SCM_RIGHTS */
 134     } header;
 135     int fd;           /* fd to pass */
 136 };
 137 static struct cmsg_fd cmsg = { { sizeof(cmsg.header) + sizeof(cmsg.fd), SOL_SOCKET, SCM_RIGHTS }, -1 };
 138 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 139
 140 /* complain about a protocol error and terminate the client connection */
 141 void fatal_protocol_error( struct thread *thread, const char *err, ... )
 142 {
 143     va_list args;
 144
 145     va_start( args, err );
 146     fprintf( stderr, "Protocol error:%04x: ", thread->id );
 147     vfprintf( stderr, err, args );
 148     va_end( args );
 149     thread->exit_code = 1;
 150     kill_thread( thread, 1 );
 151 }
 152
 153 /* complain about a protocol error and terminate the client connection */
 154 void fatal_protocol_perror( struct thread *thread, const char *err, ... )
 155 {
 156     va_list args;
 157
 158     va_start( args, err );
 159     fprintf( stderr, "Protocol error:%04x: ", thread->id );
 160     vfprintf( stderr, err, args );
 161     perror( " " );
 162     va_end( args );
 163     thread->exit_code = 1;
 164     kill_thread( thread, 1 );
 165 }
 166
 167 /* die on a fatal error */
 168 void fatal_error( const char *err, ... )
 169 {
 170     va_list args;
 171
 172     va_start( args, err );
 173     fprintf( stderr, "wineserver: " );
 174     vfprintf( stderr, err, args );
 175     va_end( args );
 176     exit(1);
 177 }
 178
 179 /* die on a fatal error */
 180 void fatal_perror( const char *err, ... )
 181 {
 182     va_list args;
 183
 184     va_start( args, err );
 185     fprintf( stderr, "wineserver: " );
 186     vfprintf( stderr, err, args );
 187     perror( " " );
 188     va_end( args );
 189     exit(1);
 190 }
 191
 192 /* allocate the reply data */
 193 void *set_reply_data_size( data_size_t size )
 194 {
 195     assert( size <= get_reply_max_size() );
 196     if (size && !(current->reply_data = mem_alloc( size ))) size = 0;
 197     current->reply_size = size;
 198     return current->reply_data;
 199 }
 200
 201 /* write the remaining part of the reply */
 202 void write_reply( struct thread *thread )
 203 {
 204     int ret;
 205
 206     if ((ret = write( get_unix_fd( thread->reply_fd ),
 207                       (char *)thread->reply_data + thread->reply_size - thread->reply_towrite,
 208                       thread->reply_towrite )) >= 0)
 209     {
 210         if (!(thread->reply_towrite -= ret))
 211         {
 212             free( thread->reply_data );
 213             thread->reply_data = NULL;
 214             /* sent everything, can go back to waiting for requests */
 215             set_fd_events( thread->request_fd, POLLIN );
 216             set_fd_events( thread->reply_fd, 0 );
 217         }
 218         return;
 219     }
 220     if (errno == EPIPE)
 221         kill_thread( thread, 0 );  /* normal death */
 222     else if (errno != EWOULDBLOCK && errno != EAGAIN)
 223         fatal_protocol_perror( thread, "reply write" );
 224 }
 225
 226 /* send a reply to the current thread */
 227 static void send_reply( union generic_reply *reply )
 228 {
 229     int ret;
 230
 231     if (!current->reply_size)
 232     {
 233         if ((ret = write( get_unix_fd( current->reply_fd ),
 234                           reply, sizeof(*reply) )) != sizeof(*reply)) goto error;
 235     }
 236     else
 237     {
 238         struct iovec vec[2];
 239
 240         vec[0].iov_base = (void *)reply;
 241         vec[0].iov_len  = sizeof(*reply);
 242         vec[1].iov_base = current->reply_data;
 243         vec[1].iov_len  = current->reply_size;
 244
 245         if ((ret = writev( get_unix_fd( current->reply_fd ), vec, 2 )) < sizeof(*reply)) goto error;
 246
 247         if ((current->reply_towrite = current->reply_size - (ret - sizeof(*reply))))
 248         {
 249             /* couldn't write it all, wait for POLLOUT */
 250             set_fd_events( current->reply_fd, POLLOUT );
 251             set_fd_events( current->request_fd, 0 );
 252             return;
 253         }
 254     }
 255     free( current->reply_data );
 256     current->reply_data = NULL;
 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         req_handlers[req]( &current->req, &reply );
 283     else
 284         set_error( STATUS_NOT_IMPLEMENTED );
 285
 286     if (current)
 287     {
 288         if (current->reply_fd)
 289         {
 290             reply.reply_header.error = current->error;
 291             reply.reply_header.reply_size = current->reply_size;
 292             if (debug_level) trace_reply( req, &reply );
 293             send_reply( &reply );
 294         }
 295         else
 296         {
 297             current->exit_code = 1;
 298             kill_thread( current, 1 );  /* no way to continue without reply fd */
 299         }
 300     }
 301     current = NULL;
 302 }
 303
 304 /* read a request from a thread */
 305 void read_request( struct thread *thread )
 306 {
 307     int ret;
 308
 309     if (!thread->req_toread)  /* no pending request */
 310     {
 311         if ((ret = read( get_unix_fd( thread->request_fd ), &thread->req,
 312                          sizeof(thread->req) )) != sizeof(thread->req)) goto error;
 313         if (!(thread->req_toread = thread->req.request_header.request_size))
 314         {
 315             /* no data, handle request at once */
 316             call_req_handler( thread );
 317             return;
 318         }
 319         if (!(thread->req_data = malloc( thread->req_toread )))
 320         {
 321             fatal_protocol_error( thread, "no memory for %u bytes request %d\n",
 322                                   thread->req_toread, thread->req.request_header.req );
 323             return;
 324         }
 325     }
 326
 327     /* read the variable sized data */
 328     for (;;)
 329     {
 330         ret = read( get_unix_fd( thread->request_fd ),
 331                     (char *)thread->req_data + thread->req.request_header.request_size
 332                       - thread->req_toread,
 333                     thread->req_toread );
 334         if (ret <= 0) break;
 335         if (!(thread->req_toread -= ret))
 336         {
 337             call_req_handler( thread );
 338             free( thread->req_data );
 339             thread->req_data = NULL;
 340             return;
 341         }
 342     }
 343
 344 error:
 345     if (!ret)  /* closed pipe */
 346         kill_thread( thread, 0 );
 347     else if (ret > 0)
 348         fatal_protocol_error( thread, "partial read %d\n", ret );
 349     else if (errno != EWOULDBLOCK && errno != EAGAIN)
 350         fatal_protocol_perror( thread, "read" );
 351 }
 352
 353 /* receive a file descriptor on the process socket */
 354 int receive_fd( struct process *process )
 355 {
 356     struct send_fd data;
 357     int fd, ret;
 358
 359 #ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 360     msghdr.msg_accrightslen = sizeof(int);
 361     msghdr.msg_accrights = (void *)&fd;
 362 #else  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 363     msghdr.msg_control    = &cmsg;
 364     msghdr.msg_controllen = sizeof(cmsg.header) + sizeof(fd);
 365     cmsg.fd = -1;
 366 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 367
 368     myiovec.iov_base = (void *)&data;
 369     myiovec.iov_len  = sizeof(data);
 370
 371     ret = recvmsg( get_unix_fd( process->msg_fd ), &msghdr, 0 );
 372 #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 373     fd = cmsg.fd;
 374 #endif
 375
 376     if (ret == sizeof(data))
 377     {
 378         struct thread *thread;
 379
 380         if (data.tid) thread = get_thread_from_id( data.tid );
 381         else thread = (struct thread *)grab_object( get_process_first_thread( process ));
 382
 383         if (!thread || thread->process != process || thread->state == TERMINATED)
 384         {
 385             if (debug_level)
 386                 fprintf( stderr, "%04x: *fd* %d <- %d bad thread id\n",
 387                          data.tid, data.fd, fd );
 388             close( fd );
 389         }
 390         else
 391         {
 392             if (debug_level)
 393                 fprintf( stderr, "%04x: *fd* %d <- %d\n",
 394                          thread->id, data.fd, fd );
 395             thread_add_inflight_fd( thread, data.fd, fd );
 396         }
 397         if (thread) release_object( thread );
 398         return 0;
 399     }
 400
 401     if (!ret)
 402     {
 403         kill_process( process, 0 );
 404     }
 405     else if (ret > 0)
 406     {
 407         fprintf( stderr, "Protocol error: process %04x: partial recvmsg %d for fd\n",
 408                  process->id, ret );
 409         kill_process( process, 1 );
 410     }
 411     else
 412     {
 413         if (errno != EWOULDBLOCK && errno != EAGAIN)
 414         {
 415             fprintf( stderr, "Protocol error: process %04x: ", process->id );
 416             perror( "recvmsg" );
 417             kill_process( process, 1 );
 418         }
 419     }
 420     return -1;
 421 }
 422
 423 /* send an fd to a client */
 424 int send_client_fd( struct process *process, int fd, obj_handle_t handle )
 425 {
 426     int ret;
 427
 428     if (debug_level)
 429         fprintf( stderr, "%04x: *fd* %p -> %d\n",
 430                  current ? current->id : process->id, handle, fd );
 431
 432 #ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 433     msghdr.msg_accrightslen = sizeof(fd);
 434     msghdr.msg_accrights = (void *)&fd;
 435 #else  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 436     msghdr.msg_control    = &cmsg;
 437     msghdr.msg_controllen = sizeof(cmsg.header) + sizeof(fd);
 438     cmsg.fd = fd;
 439 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 440
 441     myiovec.iov_base = (void *)&handle;
 442     myiovec.iov_len  = sizeof(handle);
 443
 444     ret = sendmsg( get_unix_fd( process->msg_fd ), &msghdr, 0 );
 445
 446     if (ret == sizeof(handle)) return 0;
 447
 448     if (ret >= 0)
 449     {
 450         fprintf( stderr, "Protocol error: process %04x: partial sendmsg %d\n", process->id, ret );
 451         kill_process( process, 1 );
 452     }
 453     else if (errno == EPIPE)
 454     {
 455         kill_process( process, 0 );
 456     }
 457     else
 458     {
 459         fprintf( stderr, "Protocol error: process %04x: ", process->id );
 460         perror( "sendmsg" );
 461         kill_process( process, 1 );
 462     }
 463     return -1;
 464 }
 465
 466 /* get current tick count to return to client */
 467 unsigned int get_tick_count(void)
 468 {
 469     return ((current_time.tv_sec - server_start_time.tv_sec) * 1000) +
 470            ((current_time.tv_usec - server_start_time.tv_usec) / 1000);
 471 }
 472
 473 static void master_socket_dump( struct object *obj, int verbose )
 474 {
 475     struct master_socket *sock = (struct master_socket *)obj;
 476     assert( obj->ops == &master_socket_ops );
 477     fprintf( stderr, "Master socket fd=%p\n", sock->fd );
 478 }
 479
 480 static void master_socket_destroy( struct object *obj )
 481 {
 482     struct master_socket *sock = (struct master_socket *)obj;
 483     assert( obj->ops == &master_socket_ops );
 484     release_object( sock->fd );
 485 }
 486
 487 /* handle a socket event */
 488 static void master_socket_poll_event( struct fd *fd, int event )
 489 {
 490     struct master_socket *sock = get_fd_user( fd );
 491     assert( master_socket->obj.ops == &master_socket_ops );
 492
 493     assert( sock == master_socket );  /* there is only one master socket */
 494
 495     if (event & (POLLERR | POLLHUP))
 496     {
 497         /* this is not supposed to happen */
 498         fprintf( stderr, "wineserver: Error on master socket\n" );
 499         set_fd_events( sock->fd, -1 );
 500     }
 501     else if (event & POLLIN)
 502     {
 503         struct sockaddr_un dummy;
 504         unsigned int len = sizeof(dummy);
 505         int client = accept( get_unix_fd( master_socket->fd ), (struct sockaddr *) &dummy, &len );
 506         if (client == -1) return;
 507         if (sock->timeout)
 508         {
 509             remove_timeout_user( sock->timeout );
 510             sock->timeout = NULL;
 511         }
 512         fcntl( client, F_SETFL, O_NONBLOCK );
 513         create_process( client, NULL, 0 );
 514     }
 515 }
 516
 517 /* remove the socket upon exit */
 518 static void socket_cleanup(void)
 519 {
 520     static int do_it_once;
 521     if (!do_it_once++) unlink( server_socket_name );
 522 }
 523
 524 /* create a directory and check its permissions */
 525 static void create_dir( const char *name, struct stat *st )
 526 {
 527     if (lstat( name, st ) == -1)
 528     {
 529         if (errno != ENOENT) fatal_perror( "lstat %s", name );
 530         if (mkdir( name, 0700 ) == -1 && errno != EEXIST) fatal_perror( "mkdir %s", name );
 531         if (lstat( name, st ) == -1) fatal_perror( "lstat %s", name );
 532     }
 533     if (!S_ISDIR(st->st_mode)) fatal_error( "%s is not a directory\n", name );
 534     if (st->st_uid != getuid()) fatal_error( "%s is not owned by you\n", name );
 535     if (st->st_mode & 077) fatal_error( "%s must not be accessible by other users\n", name );
 536 }
 537
 538 /* create the server directory and chdir to it */
 539 static void create_server_dir( const char *dir )
 540 {
 541     char *p, *server_dir;
 542     struct stat st, st2;
 543
 544     if (!(server_dir = strdup( dir ))) fatal_error( "out of memory\n" );
 545
 546     /* first create the base directory if needed */
 547
 548     p = strrchr( server_dir, '/' );
 549     *p = 0;
 550     create_dir( server_dir, &st );
 551
 552     /* now create the server directory */
 553
 554     *p = '/';
 555     create_dir( server_dir, &st );
 556
 557     if (chdir( server_dir ) == -1) fatal_perror( "chdir %s", server_dir );
 558     if (stat( ".", &st2 ) == -1) fatal_perror( "stat %s", server_dir );
 559     if (st.st_dev != st2.st_dev || st.st_ino != st2.st_ino)
 560         fatal_error( "chdir did not end up in %s\n", server_dir );
 561
 562     free( server_dir );
 563 }
 564
 565 /* create the lock file and return its file descriptor */
 566 static int create_server_lock(void)
 567 {
 568     struct stat st;
 569     int fd;
 570
 571     if (lstat( server_lock_name, &st ) == -1)
 572     {
 573         if (errno != ENOENT)
 574             fatal_perror( "lstat %s/%s", wine_get_server_dir(), server_lock_name );
 575     }
 576     else
 577     {
 578         if (!S_ISREG(st.st_mode))
 579             fatal_error( "%s/%s is not a regular file\n", wine_get_server_dir(), server_lock_name );
 580     }
 581
 582     if ((fd = open( server_lock_name, O_CREAT|O_TRUNC|O_WRONLY, 0600 )) == -1)
 583         fatal_perror( "error creating %s/%s", wine_get_server_dir(), server_lock_name );
 584     return fd;
 585 }
 586
 587 /* wait for the server lock */
 588 int wait_for_lock(void)
 589 {
 590     const char *server_dir = wine_get_server_dir();
 591     int fd, r;
 592     struct flock fl;
 593
 594     if (!server_dir) return 0;  /* no server dir, so no lock to wait on */
 595
 596     create_server_dir( server_dir );
 597     fd = create_server_lock();
 598
 599     fl.l_type   = F_WRLCK;
 600     fl.l_whence = SEEK_SET;
 601     fl.l_start  = 0;
 602     fl.l_len    = 1;
 603     r = fcntl( fd, F_SETLKW, &fl );
 604     close(fd);
 605
 606     return r;
 607 }
 608
 609 /* kill the wine server holding the lock */
 610 int kill_lock_owner( int sig )
 611 {
 612     const char *server_dir = wine_get_server_dir();
 613     int fd, i, ret = 0;
 614     pid_t pid = 0;
 615     struct flock fl;
 616
 617     if (!server_dir) return 0;  /* no server dir, nothing to do */
 618
 619     create_server_dir( server_dir );
 620     fd = create_server_lock();
 621
 622     for (i = 0; i < 10; i++)
 623     {
 624         fl.l_type   = F_WRLCK;
 625         fl.l_whence = SEEK_SET;
 626         fl.l_start  = 0;
 627         fl.l_len    = 1;
 628         if (fcntl( fd, F_GETLK, &fl ) == -1) goto done;
 629         if (fl.l_type != F_WRLCK) goto done;  /* the file is not locked */
 630         if (!pid)  /* first time around */
 631         {
 632             if (!(pid = fl.l_pid)) goto done;  /* shouldn't happen */
 633             if (sig == -1)
 634             {
 635                 if (kill( pid, SIGINT ) == -1) goto done;
 636                 kill( pid, SIGCONT );
 637                 ret = 1;
 638             }
 639             else  /* just send the specified signal and return */
 640             {
 641                 ret = (kill( pid, sig ) != -1);
 642                 goto done;
 643             }
 644         }
 645         else if (fl.l_pid != pid) goto done;  /* no longer the same process */
 646         sleep( 1 );
 647     }
 648     /* waited long enough, now kill it */
 649     kill( pid, SIGKILL );
 650
 651  done:
 652     close( fd );
 653     return ret;
 654 }
 655
 656 /* acquire the main server lock */
 657 static void acquire_lock(void)
 658 {
 659     struct sockaddr_un addr;
 660     struct stat st;
 661     struct flock fl;
 662     int fd, slen, got_lock = 0;
 663
 664     fd = create_server_lock();
 665
 666     fl.l_type   = F_WRLCK;
 667     fl.l_whence = SEEK_SET;
 668     fl.l_start  = 0;
 669     fl.l_len    = 1;
 670     if (fcntl( fd, F_SETLK, &fl ) != -1)
 671     {
 672         /* check for crashed server */
 673         if (stat( server_socket_name, &st ) != -1 &&   /* there is a leftover socket */
 674             stat( "core", &st ) != -1 && st.st_size)   /* and there is a non-empty core file */
 675         {
 676             fprintf( stderr,
 677                      "Warning: a previous instance of the wine server seems to have crashed.\n"
 678                      "Please run 'gdb %s %s/core',\n"
 679                      "type 'backtrace' at the gdb prompt and report the results. Thanks.\n\n",
 680                      server_argv0, wine_get_server_dir() );
 681         }
 682         unlink( server_socket_name ); /* we got the lock, we can safely remove the socket */
 683         got_lock = 1;
 684         /* in that case we reuse fd without closing it, this ensures
 685          * that we hold the lock until the process exits */
 686     }
 687     else
 688     {
 689         switch(errno)
 690         {
 691         case ENOLCK:
 692             break;
 693         case EACCES:
 694             /* check whether locks work at all on this file system */
 695             if (fcntl( fd, F_GETLK, &fl ) == -1) break;
 696             /* fall through */
 697         case EAGAIN:
 698             exit(2); /* we didn't get the lock, exit with special status */
 699         default:
 700             fatal_perror( "fcntl %s/%s", wine_get_server_dir(), server_lock_name );
 701         }
 702         /* it seems we can't use locks on this fs, so we will use the socket existence as lock */
 703         close( fd );
 704     }
 705
 706     if ((fd = socket( AF_UNIX, SOCK_STREAM, 0 )) == -1) fatal_perror( "socket" );
 707     addr.sun_family = AF_UNIX;
 708     strcpy( addr.sun_path, server_socket_name );
 709     slen = sizeof(addr) - sizeof(addr.sun_path) + strlen(addr.sun_path) + 1;
 710 #ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN
 711     addr.sun_len = slen;
 712 #endif
 713     if (bind( fd, (struct sockaddr *)&addr, slen ) == -1)
 714     {
 715         if ((errno == EEXIST) || (errno == EADDRINUSE))
 716         {
 717             if (got_lock)
 718                 fatal_error( "couldn't bind to the socket even though we hold the lock\n" );
 719             exit(2); /* we didn't get the lock, exit with special status */
 720         }
 721         fatal_perror( "bind" );
 722     }
 723     atexit( socket_cleanup );
 724     chmod( server_socket_name, 0600 );  /* make sure no other user can connect */
 725     if (listen( fd, 5 ) == -1) fatal_perror( "listen" );
 726
 727     if (!(master_socket = alloc_object( &master_socket_ops )) ||
 728         !(master_socket->fd = create_anonymous_fd( &master_socket_fd_ops, fd, &master_socket->obj )))
 729         fatal_error( "out of memory\n" );
 730     master_socket->timeout = NULL;
 731     set_fd_events( master_socket->fd, POLLIN );
 732     make_object_static( &master_socket->obj );
 733 }
 734
 735 /* open the master server socket and start waiting for new clients */
 736 void open_master_socket(void)
 737 {
 738     const char *server_dir = wine_get_server_dir();
 739     int fd, pid, status, sync_pipe[2];
 740     char dummy;
 741
 742     /* make sure no request is larger than the maximum size */
 743     assert( sizeof(union generic_request) == sizeof(struct request_max_size) );
 744     assert( sizeof(union generic_reply) == sizeof(struct request_max_size) );
 745
 746     if (!server_dir) fatal_error( "directory %s cannot be accessed\n", wine_get_config_dir() );
 747     create_server_dir( server_dir );
 748
 749     if (!foreground)
 750     {
 751         if (pipe( sync_pipe ) == -1) fatal_perror( "pipe" );
 752         pid = fork();
 753         switch( pid )
 754         {
 755         case 0:  /* child */
 756             setsid();
 757             close( sync_pipe[0] );
 758
 759             acquire_lock();
 760
 761             /* close stdin and stdout */
 762             if ((fd = open( "/dev/null", O_RDWR )) != -1)
 763             {
 764                 dup2( fd, 0 );
 765                 dup2( fd, 1 );
 766                 close( fd );
 767             }
 768
 769             /* signal parent */
 770             dummy = 0;
 771             write( sync_pipe[1], &dummy, 1 );
 772             close( sync_pipe[1] );
 773             break;
 774
 775         case -1:
 776             fatal_perror( "fork" );
 777             break;
 778
 779         default:  /* parent */
 780             close( sync_pipe[1] );
 781
 782             /* wait for child to signal us and then exit */
 783             if (read( sync_pipe[0], &dummy, 1 ) == 1) _exit(0);
 784
 785             /* child terminated, propagate exit status */
 786             wait4( pid, &status, 0, NULL );
 787             if (WIFEXITED(status)) _exit( WEXITSTATUS(status) );
 788             _exit(1);
 789         }
 790     }
 791     else  /* remain in the foreground */
 792     {
 793         acquire_lock();
 794     }
 795
 796     /* setup msghdr structure constant fields */
 797     msghdr.msg_name    = NULL;
 798     msghdr.msg_namelen = 0;
 799     msghdr.msg_iov     = &myiovec;
 800     msghdr.msg_iovlen  = 1;
 801
 802     /* init startup time */
 803     gettimeofday( &server_start_time, NULL );
 804
 805     /* init the process tracing mechanism */
 806     init_tracing_mechanism();
 807 }
 808
 809 /* master socket timer expiration handler */
 810 static void close_socket_timeout( void *arg )
 811 {
 812     master_socket->timeout = NULL;
 813     flush_registry();
 814
 815     /* if a new client is waiting, we keep on running */
 816     if (!force_shutdown && check_fd_events( master_socket->fd, POLLIN )) return;
 817
 818     if (debug_level) fprintf( stderr, "wineserver: exiting (pid=%ld)\n", (long) getpid() );
 819
 820 #ifdef DEBUG_OBJECTS
 821     close_objects();  /* shut down everything properly */
 822 #endif
 823     exit( force_shutdown );
 824 }
 825
 826 /* close the master socket and stop waiting for new clients */
 827 void close_master_socket(void)
 828 {
 829     if (master_socket_timeout == -1) return;  /* just keep running forever */
 830
 831     if (master_socket_timeout)
 832     {
 833         struct timeval when = current_time;
 834         add_timeout( &when, master_socket_timeout * 1000 );
 835         master_socket->timeout = add_timeout_user( &when, close_socket_timeout, NULL );
 836     }
 837     else close_socket_timeout( NULL );  /* close it right away */
 838 }
 839
 840 /* forced shutdown, used for wineserver -k */
 841 void shutdown_master_socket(void)
 842 {
 843     force_shutdown = 1;
 844     master_socket_timeout = 0;
 845     if (master_socket->timeout)
 846     {
 847         remove_timeout_user( master_socket->timeout );
 848         close_socket_timeout( NULL );
 849     }
 850     set_fd_events( master_socket->fd, -1 ); /* stop waiting for new clients */
 851 }