dlls/ntdll/server.c

   1 /*
   2  * Wine server communication
   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 <ctype.h>
  26 #include <dirent.h>
  27 #include <errno.h>
  28 #include <fcntl.h>
  29 #include <signal.h>
  30 #include <stdarg.h>
  31 #include <stdio.h>
  32 #include <string.h>
  33 #include <sys/types.h>
  34 #ifdef HAVE_SYS_SOCKET_H
  35 # include <sys/socket.h>
  36 #endif
  37 #ifdef HAVE_SYS_WAIT_H
  38 #include <sys/wait.h>
  39 #endif
  40 #ifdef HAVE_SYS_UN_H
  41 #include <sys/un.h>
  42 #endif
  43 #ifdef HAVE_SYS_MMAN_H
  44 #include <sys/mman.h>
  45 #endif
  46 #include <sys/stat.h>
  47 #ifdef HAVE_SYS_UIO_H
  48 #include <sys/uio.h>
  49 #endif
  50 #ifdef HAVE_UNISTD_H
  51 # include <unistd.h>
  52 #endif
  53
  54 #include "ntstatus.h"
  55 #include "thread.h"
  56 #include "wine/library.h"
  57 #include "wine/pthread.h"
  58 #include "wine/server.h"
  59 #include "wine/debug.h"
  60 #include "winerror.h"
  61 #include "ntdll_misc.h"
  62
  63 WINE_DEFAULT_DEBUG_CHANNEL(server);
  64
  65 /* Some versions of glibc don't define this */
  66 #ifndef SCM_RIGHTS
  67 #define SCM_RIGHTS 1
  68 #endif
  69
  70 #define SOCKETNAME "socket"        /* name of the socket file */
  71 #define LOCKNAME   "lock"          /* name of the lock file */
  72
  73 #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
  74 /* data structure used to pass an fd with sendmsg/recvmsg */
  75 struct cmsg_fd
  76 {
  77     int len;   /* size of structure */
  78     int level; /* SOL_SOCKET */
  79     int type;  /* SCM_RIGHTS */
  80     int fd;    /* fd to pass */
  81 };
  82 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
  83
  84 static sigset_t block_set;  /* signals to block during server calls */
  85 static int fd_socket = -1;  /* socket to exchange file descriptors with the server */
  86
  87 #ifdef __GNUC__
  88 static void fatal_error( const char *err, ... ) __attribute__((noreturn, format(printf,1,2)));
  89 static void fatal_perror( const char *err, ... ) __attribute__((noreturn, format(printf,1,2)));
  90 static void server_connect_error( const char *serverdir ) __attribute__((noreturn));
  91 #endif
  92
  93 /* die on a fatal error; use only during initialization */
  94 static void fatal_error( const char *err, ... )
  95 {
  96     va_list args;
  97
  98     va_start( args, err );
  99     fprintf( stderr, "wine: " );
 100     vfprintf( stderr, err, args );
 101     va_end( args );
 102     exit(1);
 103 }
 104
 105 /* die on a fatal error; use only during initialization */
 106 static void fatal_perror( const char *err, ... )
 107 {
 108     va_list args;
 109
 110     va_start( args, err );
 111     fprintf( stderr, "wine: " );
 112     vfprintf( stderr, err, args );
 113     perror( " " );
 114     va_end( args );
 115     exit(1);
 116 }
 117
 118
 119 /***********************************************************************
 120  *           server_abort_thread
 121  */
 122 void server_abort_thread( int status )
 123 {
 124     sigprocmask( SIG_BLOCK, &block_set, NULL );
 125     close( NtCurrentTeb()->wait_fd[0] );
 126     close( NtCurrentTeb()->wait_fd[1] );
 127     close( NtCurrentTeb()->reply_fd );
 128     close( NtCurrentTeb()->request_fd );
 129     wine_pthread_abort_thread( status );
 130 }
 131
 132
 133 /***********************************************************************
 134  *           server_protocol_error
 135  */
 136 void server_protocol_error( const char *err, ... )
 137 {
 138     va_list args;
 139
 140     va_start( args, err );
 141     fprintf( stderr, "wine client error:%lx: ", GetCurrentThreadId() );
 142     vfprintf( stderr, err, args );
 143     va_end( args );
 144     server_abort_thread(1);
 145 }
 146
 147
 148 /***********************************************************************
 149  *           server_protocol_perror
 150  */
 151 void server_protocol_perror( const char *err )
 152 {
 153     fprintf( stderr, "wine client error:%lx: ", GetCurrentThreadId() );
 154     perror( err );
 155     server_abort_thread(1);
 156 }
 157
 158
 159 /***********************************************************************
 160  *           send_request
 161  *
 162  * Send a request to the server.
 163  */
 164 static void send_request( const struct __server_request_info *req )
 165 {
 166     unsigned int i;
 167     int ret;
 168
 169     if (!req->u.req.request_header.request_size)
 170     {
 171         if ((ret = write( NtCurrentTeb()->request_fd, &req->u.req,
 172                           sizeof(req->u.req) )) == sizeof(req->u.req)) return;
 173
 174     }
 175     else
 176     {
 177         struct iovec vec[__SERVER_MAX_DATA+1];
 178
 179         vec[0].iov_base = (void *)&req->u.req;
 180         vec[0].iov_len = sizeof(req->u.req);
 181         for (i = 0; i < req->data_count; i++)
 182         {
 183             vec[i+1].iov_base = (void *)req->data[i].ptr;
 184             vec[i+1].iov_len = req->data[i].size;
 185         }
 186         if ((ret = writev( NtCurrentTeb()->request_fd, vec, i+1 )) ==
 187             req->u.req.request_header.request_size + sizeof(req->u.req)) return;
 188     }
 189
 190     if (ret >= 0) server_protocol_error( "partial write %d\n", ret );
 191     if (errno == EPIPE) server_abort_thread(0);
 192     server_protocol_perror( "write" );
 193 }
 194
 195
 196 /***********************************************************************
 197  *           read_reply_data
 198  *
 199  * Read data from the reply buffer; helper for wait_reply.
 200  */
 201 static void read_reply_data( void *buffer, size_t size )
 202 {
 203     int ret;
 204
 205     for (;;)
 206     {
 207         if ((ret = read( NtCurrentTeb()->reply_fd, buffer, size )) > 0)
 208         {
 209             if (!(size -= ret)) return;
 210             buffer = (char *)buffer + ret;
 211             continue;
 212         }
 213         if (!ret) break;
 214         if (errno == EINTR) continue;
 215         if (errno == EPIPE) break;
 216         server_protocol_perror("read");
 217     }
 218     /* the server closed the connection; time to die... */
 219     server_abort_thread(0);
 220 }
 221
 222
 223 /***********************************************************************
 224  *           wait_reply
 225  *
 226  * Wait for a reply from the server.
 227  */
 228 inline static void wait_reply( struct __server_request_info *req )
 229 {
 230     read_reply_data( &req->u.reply, sizeof(req->u.reply) );
 231     if (req->u.reply.reply_header.reply_size)
 232         read_reply_data( req->reply_data, req->u.reply.reply_header.reply_size );
 233 }
 234
 235
 236 /***********************************************************************
 237  *           wine_server_call (NTDLL.@)
 238  *
 239  * Perform a server call.
 240  *
 241  * PARAMS
 242  *     req_ptr [I/O] Function dependent data
 243  *
 244  * RETURNS
 245  *     Depends on server function being called, but usually an NTSTATUS code.
 246  *
 247  * NOTES
 248  *     Use the SERVER_START_REQ and SERVER_END_REQ to help you fill out the
 249  *     server request structure for the particular call. E.g:
 250  *|     SERVER_START_REQ( event_op )
 251  *|     {
 252  *|         req->handle = handle;
 253  *|         req->op     = SET_EVENT;
 254  *|         ret = wine_server_call( req );
 255  *|     }
 256  *|     SERVER_END_REQ;
 257  */
 258 unsigned int wine_server_call( void *req_ptr )
 259 {
 260     struct __server_request_info * const req = req_ptr;
 261     sigset_t old_set;
 262
 263     sigprocmask( SIG_BLOCK, &block_set, &old_set );
 264     send_request( req );
 265     wait_reply( req );
 266     sigprocmask( SIG_SETMASK, &old_set, NULL );
 267     return req->u.reply.reply_header.error;
 268 }
 269
 270
 271 /***********************************************************************
 272  *           wine_server_send_fd   (NTDLL.@)
 273  *
 274  * Send a file descriptor to the server.
 275  *
 276  * PARAMS
 277  *     fd [I] file descriptor to send
 278  *
 279  * RETURNS
 280  *     nothing
 281  */
 282 void wine_server_send_fd( int fd )
 283 {
 284 #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 285     struct cmsg_fd cmsg;
 286 #endif
 287     struct send_fd data;
 288     struct msghdr msghdr;
 289     struct iovec vec;
 290     int ret;
 291
 292     vec.iov_base = (void *)&data;
 293     vec.iov_len  = sizeof(data);
 294
 295     msghdr.msg_name    = NULL;
 296     msghdr.msg_namelen = 0;
 297     msghdr.msg_iov     = &vec;
 298     msghdr.msg_iovlen  = 1;
 299
 300 #ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 301     msghdr.msg_accrights    = (void *)&fd;
 302     msghdr.msg_accrightslen = sizeof(fd);
 303 #else  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 304     cmsg.len   = sizeof(cmsg);
 305     cmsg.level = SOL_SOCKET;
 306     cmsg.type  = SCM_RIGHTS;
 307     cmsg.fd    = fd;
 308     msghdr.msg_control    = &cmsg;
 309     msghdr.msg_controllen = sizeof(cmsg);
 310     msghdr.msg_flags      = 0;
 311 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 312
 313     data.tid = GetCurrentThreadId();
 314     data.fd  = fd;
 315
 316     for (;;)
 317     {
 318         if ((ret = sendmsg( fd_socket, &msghdr, 0 )) == sizeof(data)) return;
 319         if (ret >= 0) server_protocol_error( "partial write %d\n", ret );
 320         if (errno == EINTR) continue;
 321         if (errno == EPIPE) server_abort_thread(0);
 322         server_protocol_perror( "sendmsg" );
 323     }
 324 }
 325
 326
 327 /***********************************************************************
 328  *           receive_fd
 329  *
 330  * Receive a file descriptor passed from the server.
 331  */
 332 static int receive_fd( obj_handle_t *handle )
 333 {
 334     struct iovec vec;
 335     int ret, fd;
 336
 337 #ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 338     struct msghdr msghdr;
 339
 340     fd = -1;
 341     msghdr.msg_accrights    = (void *)&fd;
 342     msghdr.msg_accrightslen = sizeof(fd);
 343 #else  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 344     struct msghdr msghdr;
 345     struct cmsg_fd cmsg;
 346
 347     cmsg.len   = sizeof(cmsg);
 348     cmsg.level = SOL_SOCKET;
 349     cmsg.type  = SCM_RIGHTS;
 350     cmsg.fd    = -1;
 351     msghdr.msg_control    = &cmsg;
 352     msghdr.msg_controllen = sizeof(cmsg);
 353     msghdr.msg_flags      = 0;
 354 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 355
 356     msghdr.msg_name    = NULL;
 357     msghdr.msg_namelen = 0;
 358     msghdr.msg_iov     = &vec;
 359     msghdr.msg_iovlen  = 1;
 360     vec.iov_base = (void *)handle;
 361     vec.iov_len  = sizeof(*handle);
 362
 363     for (;;)
 364     {
 365         if ((ret = recvmsg( fd_socket, &msghdr, 0 )) > 0)
 366         {
 367 #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 368             fd = cmsg.fd;
 369 #endif
 370             if (fd == -1) server_protocol_error( "no fd received for handle %d\n", *handle );
 371             fcntl( fd, F_SETFD, 1 ); /* set close on exec flag */
 372             return fd;
 373         }
 374         if (!ret) break;
 375         if (errno == EINTR) continue;
 376         if (errno == EPIPE) break;
 377         server_protocol_perror("recvmsg");
 378     }
 379     /* the server closed the connection; time to die... */
 380     server_abort_thread(0);
 381 }
 382
 383
 384 /***********************************************************************
 385  *           store_cached_fd
 386  *
 387  * Store the cached fd value for a given handle back into the server.
 388  * Returns the new fd, which can be different if there was already an
 389  * fd in the cache for that handle.
 390  */
 391 inline static int store_cached_fd( int *fd, obj_handle_t handle )
 392 {
 393     int ret;
 394
 395     SERVER_START_REQ( set_handle_info )
 396     {
 397         req->handle = handle;
 398         req->flags  = 0;
 399         req->mask   = 0;
 400         req->fd     = *fd;
 401         if (!(ret = wine_server_call( req )))
 402         {
 403             if (reply->cur_fd != *fd)
 404             {
 405                 /* someone was here before us */
 406                 close( *fd );
 407                 *fd = reply->cur_fd;
 408             }
 409         }
 410         else
 411         {
 412             close( *fd );
 413             *fd = -1;
 414         }
 415     }
 416     SERVER_END_REQ;
 417     return ret;
 418 }
 419
 420
 421 /***********************************************************************
 422  *           wine_server_fd_to_handle   (NTDLL.@)
 423  *
 424  * Allocate a file handle for a Unix file descriptor.
 425  *
 426  * PARAMS
 427  *     fd      [I] Unix file descriptor.
 428  *     access  [I] Win32 access flags.
 429  *     inherit [I] Indicates whether this handle is inherited by child processes.
 430  *     handle  [O] Address where Wine file handle will be stored.
 431  *
 432  * RETURNS
 433  *     NTSTATUS code
 434  */
 435 int wine_server_fd_to_handle( int fd, unsigned int access, int inherit, obj_handle_t *handle )
 436 {
 437     int ret;
 438
 439     *handle = 0;
 440     wine_server_send_fd( fd );
 441
 442     SERVER_START_REQ( alloc_file_handle )
 443     {
 444         req->access  = access;
 445         req->inherit = inherit;
 446         req->fd      = fd;
 447         if (!(ret = wine_server_call( req ))) *handle = reply->handle;
 448     }
 449     SERVER_END_REQ;
 450     return ret;
 451 }
 452
 453
 454 /***********************************************************************
 455  *           wine_server_handle_to_fd   (NTDLL.@)
 456  *
 457  * Retrieve the file descriptor corresponding to a file handle.
 458  *
 459  * PARAMS
 460  *     handle  [I] Wine file handle.
 461  *     access  [I] Win32 file access rights requested.
 462  *     unix_fd [O] Address where Unix file descriptor will be stored.
 463  *     type    [O] Address where the file type will be stored. Optional.
 464  *     flags   [O] Address where the Unix flags associated with file will be stored. Optional.
 465  *
 466  * RETURNS
 467  *     NTSTATUS code
 468  */
 469 int wine_server_handle_to_fd( obj_handle_t handle, unsigned int access, int *unix_fd,
 470                               enum fd_type *type, int *flags )
 471 {
 472     obj_handle_t fd_handle;
 473     int ret, fd = -1;
 474
 475     *unix_fd = -1;
 476     for (;;)
 477     {
 478         SERVER_START_REQ( get_handle_fd )
 479         {
 480             req->handle = handle;
 481             req->access = access;
 482             if (!(ret = wine_server_call( req ))) fd = reply->fd;
 483             if (type) *type = reply->type;
 484             if (flags) *flags = reply->flags;
 485         }
 486         SERVER_END_REQ;
 487         if (ret) return ret;
 488
 489         if (fd != -1) break;
 490
 491         /* it wasn't in the cache, get it from the server */
 492         fd = receive_fd( &fd_handle );
 493         /* and store it back into the cache */
 494         ret = store_cached_fd( &fd, fd_handle );
 495         if (ret) return ret;
 496
 497         if (fd_handle == handle) break;
 498         /* if we received a different handle this means there was
 499          * a race with another thread; we restart everything from
 500          * scratch in this case.
 501          */
 502     }
 503
 504     if ((fd != -1) && ((fd = dup(fd)) == -1)) return STATUS_TOO_MANY_OPENED_FILES;
 505     *unix_fd = fd;
 506     return STATUS_SUCCESS;
 507 }
 508
 509
 510 /***********************************************************************
 511  *           wine_server_release_fd   (NTDLL.@)
 512  *
 513  * Release the Unix file descriptor returned by wine_server_handle_to_fd.
 514  *
 515  * PARAMS
 516  *     handle  [I] Wine file handle.
 517  *     unix_fd [I] Unix file descriptor to release.
 518  *
 519  * RETURNS
 520  *     nothing
 521  */
 522 void wine_server_release_fd( obj_handle_t handle, int unix_fd )
 523 {
 524     close( unix_fd );
 525 }
 526
 527
 528 /***********************************************************************
 529  *           start_server
 530  *
 531  * Start a new wine server.
 532  */
 533 static void start_server( const char *oldcwd )
 534 {
 535     static int started;  /* we only try once */
 536     char *path, *p;
 537     char *argv[3];
 538
 539     if (!started)
 540     {
 541         int status;
 542         int pid = fork();
 543         if (pid == -1) fatal_perror( "fork" );
 544         if (!pid)
 545         {
 546             argv[0] = "wineserver";
 547             argv[1] = TRACE_ON(server) ? "-d" : NULL;
 548             argv[2] = NULL;
 549             /* if server is explicitly specified, use this */
 550             if ((p = getenv("WINESERVER")))
 551             {
 552                 if (p[0] != '/' && oldcwd[0] == '/')  /* make it an absolute path */
 553                 {
 554                     if (!(path = malloc( strlen(oldcwd) + strlen(p) + 1 )))
 555                         fatal_error( "out of memory\n" );
 556                     sprintf( path, "%s/%s", oldcwd, p );
 557                     p = path;
 558                 }
 559                 wine_exec_wine_binary( p, argv, NULL, FALSE );
 560                 fatal_perror( "could not exec the server '%s'\n"
 561                               "    specified in the WINESERVER environment variable", p );
 562             }
 563             /* now use the standard search strategy */
 564             wine_exec_wine_binary( argv[0], argv, NULL, FALSE );
 565             fatal_error( "could not exec wineserver\n" );
 566         }
 567         waitpid( pid, &status, 0 );
 568         status = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
 569         if (status == 2) return;  /* server lock held by someone else, will retry later */
 570         if (status) exit(status);  /* server failed */
 571         started = 1;
 572     }
 573 }
 574
 575
 576 /***********************************************************************
 577  *           server_connect_error
 578  *
 579  * Try to display a meaningful explanation of why we couldn't connect
 580  * to the server.
 581  */
 582 static void server_connect_error( const char *serverdir )
 583 {
 584     int fd;
 585     struct flock fl;
 586
 587     if ((fd = open( LOCKNAME, O_WRONLY )) == -1)
 588         fatal_error( "for some mysterious reason, the wine server never started.\n" );
 589
 590     fl.l_type   = F_WRLCK;
 591     fl.l_whence = SEEK_SET;
 592     fl.l_start  = 0;
 593     fl.l_len    = 1;
 594     if (fcntl( fd, F_GETLK, &fl ) != -1)
 595     {
 596         if (fl.l_type == F_WRLCK)  /* the file is locked */
 597             fatal_error( "a wine server seems to be running, but I cannot connect to it.\n"
 598                          "   You probably need to kill that process (it might be pid %d).\n",
 599                          (int)fl.l_pid );
 600         fatal_error( "for some mysterious reason, the wine server failed to run.\n" );
 601     }
 602     fatal_error( "the file system of '%s' doesn't support locks,\n"
 603           "   and there is a 'socket' file in that directory that prevents wine from starting.\n"
 604           "   You should make sure no wine server is running, remove that file and try again.\n",
 605                  serverdir );
 606 }
 607
 608
 609 /***********************************************************************
 610  *           server_connect
 611  *
 612  * Attempt to connect to an existing server socket.
 613  * We need to be in the server directory already.
 614  */
 615 static int server_connect( const char *oldcwd, const char *serverdir )
 616 {
 617     struct sockaddr_un addr;
 618     struct stat st;
 619     int s, slen, retry;
 620
 621     /* chdir to the server directory */
 622     if (chdir( serverdir ) == -1)
 623     {
 624         if (errno != ENOENT) fatal_perror( "chdir to %s", serverdir );
 625         start_server( "." );
 626         if (chdir( serverdir ) == -1) fatal_perror( "chdir to %s", serverdir );
 627     }
 628
 629     /* make sure we are at the right place */
 630     if (stat( ".", &st ) == -1) fatal_perror( "stat %s", serverdir );
 631     if (st.st_uid != getuid()) fatal_error( "'%s' is not owned by you\n", serverdir );
 632     if (st.st_mode & 077) fatal_error( "'%s' must not be accessible by other users\n", serverdir );
 633
 634     for (retry = 0; retry < 6; retry++)
 635     {
 636         /* if not the first try, wait a bit to leave the previous server time to exit */
 637         if (retry)
 638         {
 639             usleep( 100000 * retry * retry );
 640             start_server( oldcwd );
 641             if (lstat( SOCKETNAME, &st ) == -1) continue;  /* still no socket, wait a bit more */
 642         }
 643         else if (lstat( SOCKETNAME, &st ) == -1) /* check for an already existing socket */
 644         {
 645             if (errno != ENOENT) fatal_perror( "lstat %s/%s", serverdir, SOCKETNAME );
 646             start_server( oldcwd );
 647             if (lstat( SOCKETNAME, &st ) == -1) continue;  /* still no socket, wait a bit more */
 648         }
 649
 650         /* make sure the socket is sane (ISFIFO needed for Solaris) */
 651         if (!S_ISSOCK(st.st_mode) && !S_ISFIFO(st.st_mode))
 652             fatal_error( "'%s/%s' is not a socket\n", serverdir, SOCKETNAME );
 653         if (st.st_uid != getuid())
 654             fatal_error( "'%s/%s' is not owned by you\n", serverdir, SOCKETNAME );
 655
 656         /* try to connect to it */
 657         addr.sun_family = AF_UNIX;
 658         strcpy( addr.sun_path, SOCKETNAME );
 659         slen = sizeof(addr) - sizeof(addr.sun_path) + strlen(addr.sun_path) + 1;
 660 #ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN
 661         addr.sun_len = slen;
 662 #endif
 663         if ((s = socket( AF_UNIX, SOCK_STREAM, 0 )) == -1) fatal_perror( "socket" );
 664         if (connect( s, (struct sockaddr *)&addr, slen ) != -1)
 665         {
 666             fcntl( s, F_SETFD, 1 ); /* set close on exec flag */
 667             return s;
 668         }
 669         close( s );
 670     }
 671     server_connect_error( serverdir );
 672 }
 673
 674
 675 /***********************************************************************
 676  *           rm_rf
 677  *
 678  * Remove a directory and all its contents; helper for create_config_dir.
 679  */
 680 static void rm_rf( const char *path )
 681 {
 682     int err = errno;  /* preserve errno */
 683     DIR *dir;
 684     char *buffer, *p;
 685     struct stat st;
 686     struct dirent *de;
 687
 688     if (!(buffer = malloc( strlen(path) + 256 + 1 ))) goto done;
 689     strcpy( buffer, path );
 690     p = buffer + strlen(buffer);
 691     *p++ = '/';
 692
 693     if ((dir = opendir( path )))
 694     {
 695         while ((de = readdir( dir )))
 696         {
 697             if (!strcmp( de->d_name, "." ) || !strcmp( de->d_name, ".." )) continue;
 698             strcpy( p, de->d_name );
 699             if (unlink( buffer ) != -1) continue;
 700             if (errno == EISDIR ||
 701                 (errno == EPERM && !lstat( buffer, &st ) && S_ISDIR(st.st_mode)))
 702             {
 703                 /* recurse in the sub-directory */
 704                 rm_rf( buffer );
 705             }
 706         }
 707         closedir( dir );
 708     }
 709     free( buffer );
 710     rmdir( path );
 711 done:
 712     errno = err;
 713 }
 714
 715
 716 /***********************************************************************
 717  *           create_config_dir
 718  *
 719  * Create the wine configuration dir (~/.wine).
 720  */
 721 static void create_config_dir(void)
 722 {
 723     const char *config_dir = wine_get_config_dir();
 724     char *tmp_dir;
 725     int fd;
 726     pid_t pid, wret;
 727
 728     if (!(tmp_dir = malloc( strlen(config_dir) + sizeof("-XXXXXX") )))
 729         fatal_error( "out of memory\n" );
 730     strcpy( tmp_dir, config_dir );
 731     strcat( tmp_dir, "-XXXXXX" );
 732     if ((fd = mkstemps( tmp_dir, 0 )) == -1)
 733         fatal_perror( "can't get temp file name for %s", config_dir );
 734     close( fd );
 735     unlink( tmp_dir );
 736     if (mkdir( tmp_dir, 0777 ) == -1)
 737         fatal_perror( "cannot create temp dir %s", tmp_dir );
 738
 739     MESSAGE( "wine: creating configuration directory '%s'...\n", config_dir );
 740     pid = fork();
 741     if (pid == -1)
 742     {
 743         rmdir( tmp_dir );
 744         fatal_perror( "fork" );
 745     }
 746     if (!pid)
 747     {
 748         const char *argv[5];
 749
 750         argv[0] = "wineprefixcreate";
 751         argv[1] = "--quiet";
 752         argv[2] = "--prefix";
 753         argv[3] = tmp_dir;
 754         argv[4] = NULL;
 755         wine_exec_wine_binary( argv[0], (char **)argv, NULL, FALSE );
 756         rmdir( tmp_dir );
 757         fatal_perror( "could not exec wineprefixcreate" );
 758     }
 759     else
 760     {
 761         int status;
 762
 763         while ((wret = waitpid( pid, &status, 0 )) != pid)
 764         {
 765             if (wret == -1 && errno != EINTR) fatal_perror( "wait4" );
 766         }
 767         if (!WIFEXITED(status) || WEXITSTATUS(status))
 768         {
 769             rm_rf( tmp_dir );
 770             fatal_error( "wineprefixcreate failed while creating '%s'.\n", config_dir );
 771         }
 772     }
 773     if (rename( tmp_dir, config_dir ) == -1)
 774     {
 775         rm_rf( tmp_dir );
 776         if (errno != EEXIST && errno != ENOTEMPTY)
 777             fatal_perror( "rename '%s' to '%s'", tmp_dir, config_dir );
 778         /* else it was probably created by a concurrent wine process */
 779     }
 780     free( tmp_dir );
 781     MESSAGE( "wine: '%s' created successfully.\n", config_dir );
 782 }
 783
 784
 785 /***********************************************************************
 786  *           server_init_process
 787  *
 788  * Start the server and create the initial socket pair.
 789  */
 790 void server_init_process(void)
 791 {
 792     int size;
 793     char *oldcwd;
 794     obj_handle_t dummy_handle;
 795     const char *server_dir = wine_get_server_dir();
 796
 797     if (!server_dir)  /* this means the config dir doesn't exist */
 798     {
 799         create_config_dir();
 800         server_dir = wine_get_server_dir();
 801     }
 802
 803     /* retrieve the current directory */
 804     for (size = 512; ; size *= 2)
 805     {
 806         if (!(oldcwd = malloc( size ))) break;
 807         if (getcwd( oldcwd, size )) break;
 808         free( oldcwd );
 809         if (errno == ERANGE) continue;
 810         oldcwd = NULL;
 811         break;
 812     }
 813
 814     /* connect to the server */
 815     fd_socket = server_connect( oldcwd, server_dir );
 816
 817     /* switch back to the starting directory */
 818     if (oldcwd)
 819     {
 820         chdir( oldcwd );
 821         free( oldcwd );
 822     }
 823
 824     /* setup the signal mask */
 825     sigemptyset( &block_set );
 826     sigaddset( &block_set, SIGALRM );
 827     sigaddset( &block_set, SIGIO );
 828     sigaddset( &block_set, SIGINT );
 829     sigaddset( &block_set, SIGHUP );
 830     sigaddset( &block_set, SIGUSR1 );
 831     sigaddset( &block_set, SIGUSR2 );
 832
 833     /* receive the first thread request fd on the main socket */
 834     NtCurrentTeb()->request_fd = receive_fd( &dummy_handle );
 835 }
 836
 837
 838 /***********************************************************************
 839  *           server_init_thread
 840  *
 841  * Send an init thread request. Return 0 if OK.
 842  */
 843 void server_init_thread( int unix_pid, int unix_tid, void *entry_point )
 844 {
 845     TEB *teb = NtCurrentTeb();
 846     int version, ret;
 847     int reply_pipe[2];
 848     struct sigaction sig_act;
 849
 850     sig_act.sa_handler = SIG_IGN;
 851     sig_act.sa_flags   = 0;
 852     sigemptyset( &sig_act.sa_mask );
 853
 854     /* ignore SIGPIPE so that we get a EPIPE error instead  */
 855     sigaction( SIGPIPE, &sig_act, NULL );
 856     /* automatic child reaping to avoid zombies */
 857 #ifdef SA_NOCLDWAIT
 858     sig_act.sa_flags |= SA_NOCLDWAIT;
 859 #endif
 860     sigaction( SIGCHLD, &sig_act, NULL );
 861
 862     /* create the server->client communication pipes */
 863     if (pipe( reply_pipe ) == -1) server_protocol_perror( "pipe" );
 864     if (pipe( teb->wait_fd ) == -1) server_protocol_perror( "pipe" );
 865     wine_server_send_fd( reply_pipe[1] );
 866     wine_server_send_fd( teb->wait_fd[1] );
 867     teb->reply_fd = reply_pipe[0];
 868     close( reply_pipe[1] );
 869
 870     /* set close on exec flag */
 871     fcntl( teb->reply_fd, F_SETFD, 1 );
 872     fcntl( teb->wait_fd[0], F_SETFD, 1 );
 873     fcntl( teb->wait_fd[1], F_SETFD, 1 );
 874
 875     SERVER_START_REQ( init_thread )
 876     {
 877         req->unix_pid    = unix_pid;
 878         req->unix_tid    = unix_tid;
 879         req->teb         = teb;
 880         req->entry       = entry_point;
 881         req->reply_fd    = reply_pipe[1];
 882         req->wait_fd     = teb->wait_fd[1];
 883         ret = wine_server_call( req );
 884         teb->ClientId.UniqueProcess = (HANDLE)reply->pid;
 885         teb->ClientId.UniqueThread  = (HANDLE)reply->tid;
 886         version  = reply->version;
 887     }
 888     SERVER_END_REQ;
 889
 890     if (ret) server_protocol_error( "init_thread failed with status %x\n", ret );
 891     if (version != SERVER_PROTOCOL_VERSION)
 892         server_protocol_error( "version mismatch %d/%d.\n"
 893                                "Your %s binary was not upgraded correctly,\n"
 894                                "or you have an older one somewhere in your PATH.\n"
 895                                "Or maybe the wrong wineserver is still running?\n",
 896                                version, SERVER_PROTOCOL_VERSION,
 897                                (version > SERVER_PROTOCOL_VERSION) ? "wine" : "wineserver" );
 898 }