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