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