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., 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 <ctype.h>
  26 #ifdef HAVE_DIRENT_H
  27 # include <dirent.h>
  28 #endif
  29 #include <errno.h>
  30 #include <fcntl.h>
  31 #include <signal.h>
  32 #include <stdarg.h>
  33 #include <stdio.h>
  34 #include <string.h>
  35 #include <sys/types.h>
  36 #ifdef HAVE_SYS_SOCKET_H
  37 # include <sys/socket.h>
  38 #endif
  39 #ifdef HAVE_SYS_WAIT_H
  40 #include <sys/wait.h>
  41 #endif
  42 #ifdef HAVE_SYS_UN_H
  43 #include <sys/un.h>
  44 #endif
  45 #ifdef HAVE_SYS_MMAN_H
  46 #include <sys/mman.h>
  47 #endif
  48 #ifdef HAVE_SYS_STAT_H
  49 # include <sys/stat.h>
  50 #endif
  51 #ifdef HAVE_SYS_UIO_H
  52 #include <sys/uio.h>
  53 #endif
  54 #ifdef HAVE_SYS_THR_H
  55 #include <sys/ucontext.h>
  56 #include <sys/thr.h>
  57 #endif
  58 #ifdef HAVE_UNISTD_H
  59 # include <unistd.h>
  60 #endif
  61
  62 #include "ntstatus.h"
  63 #define WIN32_NO_STATUS
  64 #include "wine/library.h"
  65 #include "wine/server.h"
  66 #include "wine/debug.h"
  67 #include "ntdll_misc.h"
  68
  69 WINE_DEFAULT_DEBUG_CHANNEL(server);
  70
  71 /* Some versions of glibc don't define this */
  72 #ifndef SCM_RIGHTS
  73 #define SCM_RIGHTS 1
  74 #endif
  75
  76 #define SOCKETNAME "socket"        /* name of the socket file */
  77 #define LOCKNAME   "lock"          /* name of the lock file */
  78
  79 #ifdef __i386__
  80 static const enum cpu_type client_cpu = CPU_x86;
  81 #elif defined(__x86_64__)
  82 static const enum cpu_type client_cpu = CPU_x86_64;
  83 #elif defined(__ALPHA__)
  84 static const enum cpu_type client_cpu = CPU_ALPHA;
  85 #elif defined(__powerpc__)
  86 static const enum cpu_type client_cpu = CPU_POWERPC;
  87 #elif defined(__sparc__)
  88 static const enum cpu_type client_cpu = CPU_SPARC;
  89 #else
  90 #error Unsupported CPU
  91 #endif
  92
  93 #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
  94 /* data structure used to pass an fd with sendmsg/recvmsg */
  95 struct cmsg_fd
  96 {
  97     struct
  98     {
  99         size_t len;   /* size of structure */
 100         int    level; /* SOL_SOCKET */
 101         int    type;  /* SCM_RIGHTS */
 102     } header;
 103     int fd;          /* fd to pass */
 104 };
 105 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 106
 107 timeout_t server_start_time = 0;  /* time of server startup */
 108
 109 sigset_t server_block_set;  /* signals to block during server calls */
 110 static int fd_socket = -1;  /* socket to exchange file descriptors with the server */
 111
 112 static RTL_CRITICAL_SECTION fd_cache_section;
 113 static RTL_CRITICAL_SECTION_DEBUG critsect_debug =
 114 {
 115     0, 0, &fd_cache_section,
 116     { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
 117       0, 0, { (DWORD_PTR)(__FILE__ ": fd_cache_section") }
 118 };
 119 static RTL_CRITICAL_SECTION fd_cache_section = { &critsect_debug, -1, 0, 0, 0, 0 };
 120
 121
 122 #ifdef __GNUC__
 123 static void fatal_error( const char *err, ... ) __attribute__((noreturn, format(printf,1,2)));
 124 static void fatal_perror( const char *err, ... ) __attribute__((noreturn, format(printf,1,2)));
 125 static void server_connect_error( const char *serverdir ) __attribute__((noreturn));
 126 #endif
 127
 128 /* die on a fatal error; use only during initialization */
 129 static void fatal_error( const char *err, ... )
 130 {
 131     va_list args;
 132
 133     va_start( args, err );
 134     fprintf( stderr, "wine: " );
 135     vfprintf( stderr, err, args );
 136     va_end( args );
 137     exit(1);
 138 }
 139
 140 /* die on a fatal error; use only during initialization */
 141 static void fatal_perror( const char *err, ... )
 142 {
 143     va_list args;
 144
 145     va_start( args, err );
 146     fprintf( stderr, "wine: " );
 147     vfprintf( stderr, err, args );
 148     perror( " " );
 149     va_end( args );
 150     exit(1);
 151 }
 152
 153
 154 /***********************************************************************
 155  *           server_protocol_error
 156  */
 157 void server_protocol_error( const char *err, ... )
 158 {
 159     va_list args;
 160
 161     va_start( args, err );
 162     fprintf( stderr, "wine client error:%x: ", GetCurrentThreadId() );
 163     vfprintf( stderr, err, args );
 164     va_end( args );
 165     abort_thread(1);
 166 }
 167
 168
 169 /***********************************************************************
 170  *           server_protocol_perror
 171  */
 172 void server_protocol_perror( const char *err )
 173 {
 174     fprintf( stderr, "wine client error:%x: ", GetCurrentThreadId() );
 175     perror( err );
 176     abort_thread(1);
 177 }
 178
 179
 180 /***********************************************************************
 181  *           send_request
 182  *
 183  * Send a request to the server.
 184  */
 185 static unsigned int send_request( const struct __server_request_info *req )
 186 {
 187     unsigned int i;
 188     int ret;
 189
 190     if (!req->u.req.request_header.request_size)
 191     {
 192         if ((ret = write( ntdll_get_thread_data()->request_fd, &req->u.req,
 193                           sizeof(req->u.req) )) == sizeof(req->u.req)) return STATUS_SUCCESS;
 194
 195     }
 196     else
 197     {
 198         struct iovec vec[__SERVER_MAX_DATA+1];
 199
 200         vec[0].iov_base = (void *)&req->u.req;
 201         vec[0].iov_len = sizeof(req->u.req);
 202         for (i = 0; i < req->data_count; i++)
 203         {
 204             vec[i+1].iov_base = (void *)req->data[i].ptr;
 205             vec[i+1].iov_len = req->data[i].size;
 206         }
 207         if ((ret = writev( ntdll_get_thread_data()->request_fd, vec, i+1 )) ==
 208             req->u.req.request_header.request_size + sizeof(req->u.req)) return STATUS_SUCCESS;
 209     }
 210
 211     if (ret >= 0) server_protocol_error( "partial write %d\n", ret );
 212     if (errno == EPIPE) abort_thread(0);
 213     if (errno == EFAULT) return STATUS_ACCESS_VIOLATION;
 214     server_protocol_perror( "write" );
 215 }
 216
 217
 218 /***********************************************************************
 219  *           read_reply_data
 220  *
 221  * Read data from the reply buffer; helper for wait_reply.
 222  */
 223 static void read_reply_data( void *buffer, size_t size )
 224 {
 225     int ret;
 226
 227     for (;;)
 228     {
 229         if ((ret = read( ntdll_get_thread_data()->reply_fd, buffer, size )) > 0)
 230         {
 231             if (!(size -= ret)) return;
 232             buffer = (char *)buffer + ret;
 233             continue;
 234         }
 235         if (!ret) break;
 236         if (errno == EINTR) continue;
 237         if (errno == EPIPE) break;
 238         server_protocol_perror("read");
 239     }
 240     /* the server closed the connection; time to die... */
 241     abort_thread(0);
 242 }
 243
 244
 245 /***********************************************************************
 246  *           wait_reply
 247  *
 248  * Wait for a reply from the server.
 249  */
 250 static inline unsigned int wait_reply( struct __server_request_info *req )
 251 {
 252     read_reply_data( &req->u.reply, sizeof(req->u.reply) );
 253     if (req->u.reply.reply_header.reply_size)
 254         read_reply_data( req->reply_data, req->u.reply.reply_header.reply_size );
 255     return req->u.reply.reply_header.error;
 256 }
 257
 258
 259 /***********************************************************************
 260  *           wine_server_call (NTDLL.@)
 261  *
 262  * Perform a server call.
 263  *
 264  * PARAMS
 265  *     req_ptr [I/O] Function dependent data
 266  *
 267  * RETURNS
 268  *     Depends on server function being called, but usually an NTSTATUS code.
 269  *
 270  * NOTES
 271  *     Use the SERVER_START_REQ and SERVER_END_REQ to help you fill out the
 272  *     server request structure for the particular call. E.g:
 273  *|     SERVER_START_REQ( event_op )
 274  *|     {
 275  *|         req->handle = handle;
 276  *|         req->op     = SET_EVENT;
 277  *|         ret = wine_server_call( req );
 278  *|     }
 279  *|     SERVER_END_REQ;
 280  */
 281 unsigned int wine_server_call( void *req_ptr )
 282 {
 283     struct __server_request_info * const req = req_ptr;
 284     sigset_t old_set;
 285     unsigned int ret;
 286
 287     pthread_sigmask( SIG_BLOCK, &server_block_set, &old_set );
 288     ret = send_request( req );
 289     if (!ret) ret = wait_reply( req );
 290     pthread_sigmask( SIG_SETMASK, &old_set, NULL );
 291     return ret;
 292 }
 293
 294
 295 /***********************************************************************
 296  *           server_enter_uninterrupted_section
 297  */
 298 void server_enter_uninterrupted_section( RTL_CRITICAL_SECTION *cs, sigset_t *sigset )
 299 {
 300     pthread_sigmask( SIG_BLOCK, &server_block_set, sigset );
 301     RtlEnterCriticalSection( cs );
 302 }
 303
 304
 305 /***********************************************************************
 306  *           server_leave_uninterrupted_section
 307  */
 308 void server_leave_uninterrupted_section( RTL_CRITICAL_SECTION *cs, sigset_t *sigset )
 309 {
 310     RtlLeaveCriticalSection( cs );
 311     pthread_sigmask( SIG_SETMASK, sigset, NULL );
 312 }
 313
 314
 315 /***********************************************************************
 316  *           wine_server_send_fd   (NTDLL.@)
 317  *
 318  * Send a file descriptor to the server.
 319  *
 320  * PARAMS
 321  *     fd [I] file descriptor to send
 322  *
 323  * RETURNS
 324  *     nothing
 325  */
 326 void CDECL wine_server_send_fd( int fd )
 327 {
 328 #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 329     struct cmsg_fd cmsg;
 330 #endif
 331     struct send_fd data;
 332     struct msghdr msghdr;
 333     struct iovec vec;
 334     int ret;
 335
 336     vec.iov_base = (void *)&data;
 337     vec.iov_len  = sizeof(data);
 338
 339     msghdr.msg_name    = NULL;
 340     msghdr.msg_namelen = 0;
 341     msghdr.msg_iov     = &vec;
 342     msghdr.msg_iovlen  = 1;
 343
 344 #ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 345     msghdr.msg_accrights    = (void *)&fd;
 346     msghdr.msg_accrightslen = sizeof(fd);
 347 #else  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 348     cmsg.header.len   = sizeof(cmsg.header) + sizeof(fd);
 349     cmsg.header.level = SOL_SOCKET;
 350     cmsg.header.type  = SCM_RIGHTS;
 351     cmsg.fd           = fd;
 352     msghdr.msg_control    = &cmsg;
 353     msghdr.msg_controllen = sizeof(cmsg.header) + sizeof(fd);
 354     msghdr.msg_flags      = 0;
 355 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 356
 357     data.tid = GetCurrentThreadId();
 358     data.fd  = fd;
 359
 360     for (;;)
 361     {
 362         if ((ret = sendmsg( fd_socket, &msghdr, 0 )) == sizeof(data)) return;
 363         if (ret >= 0) server_protocol_error( "partial write %d\n", ret );
 364         if (errno == EINTR) continue;
 365         if (errno == EPIPE) abort_thread(0);
 366         server_protocol_perror( "sendmsg" );
 367     }
 368 }
 369
 370
 371 /***********************************************************************
 372  *           receive_fd
 373  *
 374  * Receive a file descriptor passed from the server.
 375  */
 376 static int receive_fd( obj_handle_t *handle )
 377 {
 378     struct iovec vec;
 379     int ret, fd;
 380
 381 #ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 382     struct msghdr msghdr;
 383
 384     fd = -1;
 385     msghdr.msg_accrights    = (void *)&fd;
 386     msghdr.msg_accrightslen = sizeof(fd);
 387 #else  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 388     struct msghdr msghdr;
 389     struct cmsg_fd cmsg;
 390
 391     cmsg.header.len   = sizeof(cmsg.header) + sizeof(fd);
 392     cmsg.header.level = SOL_SOCKET;
 393     cmsg.header.type  = SCM_RIGHTS;
 394     cmsg.fd           = -1;
 395     msghdr.msg_control    = &cmsg;
 396     msghdr.msg_controllen = sizeof(cmsg.header) + sizeof(fd);
 397     msghdr.msg_flags      = 0;
 398 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 399
 400     msghdr.msg_name    = NULL;
 401     msghdr.msg_namelen = 0;
 402     msghdr.msg_iov     = &vec;
 403     msghdr.msg_iovlen  = 1;
 404     vec.iov_base = (void *)handle;
 405     vec.iov_len  = sizeof(*handle);
 406
 407     for (;;)
 408     {
 409         if ((ret = recvmsg( fd_socket, &msghdr, 0 )) > 0)
 410         {
 411 #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 412             fd = cmsg.fd;
 413 #endif
 414             if (fd != -1) fcntl( fd, F_SETFD, 1 ); /* set close on exec flag */
 415             return fd;
 416         }
 417         if (!ret) break;
 418         if (errno == EINTR) continue;
 419         if (errno == EPIPE) break;
 420         server_protocol_perror("recvmsg");
 421     }
 422     /* the server closed the connection; time to die... */
 423     abort_thread(0);
 424 }
 425
 426
 427 /***********************************************************************/
 428 /* fd cache support */
 429
 430 struct fd_cache_entry
 431 {
 432     int fd;
 433     enum server_fd_type type : 6;
 434     unsigned int        access : 2;
 435     unsigned int        options : 24;
 436 };
 437
 438 #define FD_CACHE_BLOCK_SIZE  (65536 / sizeof(struct fd_cache_entry))
 439 #define FD_CACHE_ENTRIES     128
 440
 441 static struct fd_cache_entry *fd_cache[FD_CACHE_ENTRIES];
 442 static struct fd_cache_entry fd_cache_initial_block[FD_CACHE_BLOCK_SIZE];
 443
 444 static inline unsigned int handle_to_index( HANDLE handle, unsigned int *entry )
 445 {
 446     unsigned int idx = (wine_server_obj_handle(handle) >> 2) - 1;
 447     *entry = idx / FD_CACHE_BLOCK_SIZE;
 448     return idx % FD_CACHE_BLOCK_SIZE;
 449 }
 450
 451
 452 /***********************************************************************
 453  *           add_fd_to_cache
 454  *
 455  * Caller must hold fd_cache_section.
 456  */
 457 static int add_fd_to_cache( HANDLE handle, int fd, enum server_fd_type type,
 458                             unsigned int access, unsigned int options )
 459 {
 460     unsigned int entry, idx = handle_to_index( handle, &entry );
 461     int prev_fd;
 462
 463     if (entry >= FD_CACHE_ENTRIES)
 464     {
 465         FIXME( "too many allocated handles, not caching %p\n", handle );
 466         return 0;
 467     }
 468
 469     if (!fd_cache[entry])  /* do we need to allocate a new block of entries? */
 470     {
 471         if (!entry) fd_cache[0] = fd_cache_initial_block;
 472         else
 473         {
 474             void *ptr = wine_anon_mmap( NULL, FD_CACHE_BLOCK_SIZE * sizeof(struct fd_cache_entry),
 475                                         PROT_READ | PROT_WRITE, 0 );
 476             if (ptr == MAP_FAILED) return 0;
 477             fd_cache[entry] = ptr;
 478         }
 479     }
 480     /* store fd+1 so that 0 can be used as the unset value */
 481     prev_fd = interlocked_xchg( &fd_cache[entry][idx].fd, fd + 1 ) - 1;
 482     fd_cache[entry][idx].type = type;
 483     fd_cache[entry][idx].access = access;
 484     fd_cache[entry][idx].options = options;
 485     if (prev_fd != -1) close( prev_fd );
 486     return 1;
 487 }
 488
 489
 490 /***********************************************************************
 491  *           get_cached_fd
 492  *
 493  * Caller must hold fd_cache_section.
 494  */
 495 static inline int get_cached_fd( HANDLE handle, enum server_fd_type *type,
 496                                  unsigned int *access, unsigned int *options )
 497 {
 498     unsigned int entry, idx = handle_to_index( handle, &entry );
 499     int fd = -1;
 500
 501     if (entry < FD_CACHE_ENTRIES && fd_cache[entry])
 502     {
 503         fd = fd_cache[entry][idx].fd - 1;
 504         if (type) *type = fd_cache[entry][idx].type;
 505         if (access) *access = fd_cache[entry][idx].access;
 506         if (options) *options = fd_cache[entry][idx].options;
 507     }
 508     return fd;
 509 }
 510
 511
 512 /***********************************************************************
 513  *           server_remove_fd_from_cache
 514  */
 515 int server_remove_fd_from_cache( HANDLE handle )
 516 {
 517     unsigned int entry, idx = handle_to_index( handle, &entry );
 518     int fd = -1;
 519
 520     if (entry < FD_CACHE_ENTRIES && fd_cache[entry])
 521         fd = interlocked_xchg( &fd_cache[entry][idx].fd, 0 ) - 1;
 522
 523     return fd;
 524 }
 525
 526
 527 /***********************************************************************
 528  *           server_get_unix_fd
 529  *
 530  * The returned unix_fd should be closed iff needs_close is non-zero.
 531  */
 532 int server_get_unix_fd( HANDLE handle, unsigned int wanted_access, int *unix_fd,
 533                         int *needs_close, enum server_fd_type *type, unsigned int *options )
 534 {
 535     sigset_t sigset;
 536     obj_handle_t fd_handle;
 537     int ret = 0, fd;
 538     unsigned int access = 0;
 539
 540     *unix_fd = -1;
 541     *needs_close = 0;
 542     wanted_access &= FILE_READ_DATA | FILE_WRITE_DATA;
 543
 544     server_enter_uninterrupted_section( &fd_cache_section, &sigset );
 545
 546     fd = get_cached_fd( handle, type, &access, options );
 547     if (fd != -1) goto done;
 548
 549     SERVER_START_REQ( get_handle_fd )
 550     {
 551         req->handle = wine_server_obj_handle( handle );
 552         if (!(ret = wine_server_call( req )))
 553         {
 554             if (type) *type = reply->type;
 555             if (options) *options = reply->options;
 556             access = reply->access;
 557             if ((fd = receive_fd( &fd_handle )) != -1)
 558             {
 559                 assert( wine_server_ptr_handle(fd_handle) == handle );
 560                 *needs_close = (reply->removable ||
 561                                 !add_fd_to_cache( handle, fd, reply->type,
 562                                                   reply->access, reply->options ));
 563             }
 564             else ret = STATUS_TOO_MANY_OPENED_FILES;
 565         }
 566     }
 567     SERVER_END_REQ;
 568
 569 done:
 570     server_leave_uninterrupted_section( &fd_cache_section, &sigset );
 571     if (!ret && ((access & wanted_access) != wanted_access))
 572     {
 573         ret = STATUS_ACCESS_DENIED;
 574         if (*needs_close) close( fd );
 575     }
 576     if (!ret) *unix_fd = fd;
 577     return ret;
 578 }
 579
 580
 581 /***********************************************************************
 582  *           wine_server_fd_to_handle   (NTDLL.@)
 583  *
 584  * Allocate a file handle for a Unix file descriptor.
 585  *
 586  * PARAMS
 587  *     fd      [I] Unix file descriptor.
 588  *     access  [I] Win32 access flags.
 589  *     attributes [I] Object attributes.
 590  *     handle  [O] Address where Wine file handle will be stored.
 591  *
 592  * RETURNS
 593  *     NTSTATUS code
 594  */
 595 int CDECL wine_server_fd_to_handle( int fd, unsigned int access, unsigned int attributes, HANDLE *handle )
 596 {
 597     int ret;
 598
 599     *handle = 0;
 600     wine_server_send_fd( fd );
 601
 602     SERVER_START_REQ( alloc_file_handle )
 603     {
 604         req->access     = access;
 605         req->attributes = attributes;
 606         req->fd         = fd;
 607         if (!(ret = wine_server_call( req ))) *handle = wine_server_ptr_handle( reply->handle );
 608     }
 609     SERVER_END_REQ;
 610     return ret;
 611 }
 612
 613
 614 /***********************************************************************
 615  *           wine_server_handle_to_fd   (NTDLL.@)
 616  *
 617  * Retrieve the file descriptor corresponding to a file handle.
 618  *
 619  * PARAMS
 620  *     handle  [I] Wine file handle.
 621  *     access  [I] Win32 file access rights requested.
 622  *     unix_fd [O] Address where Unix file descriptor will be stored.
 623  *     options [O] Address where the file open options will be stored. Optional.
 624  *
 625  * RETURNS
 626  *     NTSTATUS code
 627  */
 628 int CDECL wine_server_handle_to_fd( HANDLE handle, unsigned int access, int *unix_fd,
 629                               unsigned int *options )
 630 {
 631     int needs_close, ret = server_get_unix_fd( handle, access, unix_fd, &needs_close, NULL, options );
 632
 633     if (!ret && !needs_close)
 634     {
 635         if ((*unix_fd = dup(*unix_fd)) == -1) ret = FILE_GetNtStatus();
 636     }
 637     return ret;
 638 }
 639
 640
 641 /***********************************************************************
 642  *           wine_server_release_fd   (NTDLL.@)
 643  *
 644  * Release the Unix file descriptor returned by wine_server_handle_to_fd.
 645  *
 646  * PARAMS
 647  *     handle  [I] Wine file handle.
 648  *     unix_fd [I] Unix file descriptor to release.
 649  *
 650  * RETURNS
 651  *     nothing
 652  */
 653 void CDECL wine_server_release_fd( HANDLE handle, int unix_fd )
 654 {
 655     close( unix_fd );
 656 }
 657
 658
 659 /***********************************************************************
 660  *           start_server
 661  *
 662  * Start a new wine server.
 663  */
 664 static void start_server(void)
 665 {
 666     static int started;  /* we only try once */
 667     char *argv[3];
 668     static char wineserver[] = "server/wineserver";
 669     static char debug[] = "-d";
 670
 671     if (!started)
 672     {
 673         int status;
 674         int pid = fork();
 675         if (pid == -1) fatal_perror( "fork" );
 676         if (!pid)
 677         {
 678             argv[0] = wineserver;
 679             argv[1] = TRACE_ON(server) ? debug : NULL;
 680             argv[2] = NULL;
 681             wine_exec_wine_binary( argv[0], argv, getenv("WINESERVER") );
 682             fatal_error( "could not exec wineserver\n" );
 683         }
 684         waitpid( pid, &status, 0 );
 685         status = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
 686         if (status == 2) return;  /* server lock held by someone else, will retry later */
 687         if (status) exit(status);  /* server failed */
 688         started = 1;
 689     }
 690 }
 691
 692
 693 /***********************************************************************
 694  *           setup_config_dir
 695  *
 696  * Setup the wine configuration dir.
 697  */
 698 static void setup_config_dir(void)
 699 {
 700     const char *p, *config_dir = wine_get_config_dir();
 701
 702     if (chdir( config_dir ) == -1)
 703     {
 704         if (errno != ENOENT) fatal_perror( "chdir to %s\n", config_dir );
 705
 706         if ((p = strrchr( config_dir, '/' )) && p != config_dir)
 707         {
 708             struct stat st;
 709             char *tmp_dir;
 710
 711             if (!(tmp_dir = malloc( p + 1 - config_dir ))) fatal_error( "out of memory\n" );
 712             memcpy( tmp_dir, config_dir, p - config_dir );
 713             tmp_dir[p - config_dir] = 0;
 714             if (!stat( tmp_dir, &st ) && st.st_uid != getuid())
 715                 fatal_error( "'%s' is not owned by you, refusing to create a configuration directory there\n",
 716                              tmp_dir );
 717             free( tmp_dir );
 718         }
 719
 720         mkdir( config_dir, 0777 );
 721         if (chdir( config_dir ) == -1) fatal_perror( "chdir to %s\n", config_dir );
 722         MESSAGE( "wine: created the configuration directory '%s'\n", config_dir );
 723     }
 724
 725     if (mkdir( "dosdevices", 0777 ) == -1)
 726     {
 727         if (errno == EEXIST) return;
 728         fatal_perror( "cannot create %s/dosdevices\n", config_dir );
 729     }
 730
 731     /* create the drive symlinks */
 732
 733     mkdir( "drive_c", 0777 );
 734     symlink( "../drive_c", "dosdevices/c:" );
 735     symlink( "/", "dosdevices/z:" );
 736 }
 737
 738
 739 /***********************************************************************
 740  *           server_connect_error
 741  *
 742  * Try to display a meaningful explanation of why we couldn't connect
 743  * to the server.
 744  */
 745 static void server_connect_error( const char *serverdir )
 746 {
 747     int fd;
 748     struct flock fl;
 749
 750     if ((fd = open( LOCKNAME, O_WRONLY )) == -1)
 751         fatal_error( "for some mysterious reason, the wine server never started.\n" );
 752
 753     fl.l_type   = F_WRLCK;
 754     fl.l_whence = SEEK_SET;
 755     fl.l_start  = 0;
 756     fl.l_len    = 1;
 757     if (fcntl( fd, F_GETLK, &fl ) != -1)
 758     {
 759         if (fl.l_type == F_WRLCK)  /* the file is locked */
 760             fatal_error( "a wine server seems to be running, but I cannot connect to it.\n"
 761                          "   You probably need to kill that process (it might be pid %d).\n",
 762                          (int)fl.l_pid );
 763         fatal_error( "for some mysterious reason, the wine server failed to run.\n" );
 764     }
 765     fatal_error( "the file system of '%s' doesn't support locks,\n"
 766           "   and there is a 'socket' file in that directory that prevents wine from starting.\n"
 767           "   You should make sure no wine server is running, remove that file and try again.\n",
 768                  serverdir );
 769 }
 770
 771
 772 /***********************************************************************
 773  *           server_connect
 774  *
 775  * Attempt to connect to an existing server socket.
 776  * We need to be in the server directory already.
 777  */
 778 static int server_connect(void)
 779 {
 780     const char *serverdir;
 781     struct sockaddr_un addr;
 782     struct stat st;
 783     int s, slen, retry, fd_cwd;
 784
 785     /* retrieve the current directory */
 786     fd_cwd = open( ".", O_RDONLY );
 787     if (fd_cwd != -1) fcntl( fd_cwd, F_SETFD, 1 ); /* set close on exec flag */
 788
 789     setup_config_dir();
 790     serverdir = wine_get_server_dir();
 791
 792     /* chdir to the server directory */
 793     if (chdir( serverdir ) == -1)
 794     {
 795         if (errno != ENOENT) fatal_perror( "chdir to %s", serverdir );
 796         start_server();
 797         if (chdir( serverdir ) == -1) fatal_perror( "chdir to %s", serverdir );
 798     }
 799
 800     /* make sure we are at the right place */
 801     if (stat( ".", &st ) == -1) fatal_perror( "stat %s", serverdir );
 802     if (st.st_uid != getuid()) fatal_error( "'%s' is not owned by you\n", serverdir );
 803     if (st.st_mode & 077) fatal_error( "'%s' must not be accessible by other users\n", serverdir );
 804
 805     for (retry = 0; retry < 6; retry++)
 806     {
 807         /* if not the first try, wait a bit to leave the previous server time to exit */
 808         if (retry)
 809         {
 810             usleep( 100000 * retry * retry );
 811             start_server();
 812             if (lstat( SOCKETNAME, &st ) == -1) continue;  /* still no socket, wait a bit more */
 813         }
 814         else if (lstat( SOCKETNAME, &st ) == -1) /* check for an already existing socket */
 815         {
 816             if (errno != ENOENT) fatal_perror( "lstat %s/%s", serverdir, SOCKETNAME );
 817             start_server();
 818             if (lstat( SOCKETNAME, &st ) == -1) continue;  /* still no socket, wait a bit more */
 819         }
 820
 821         /* make sure the socket is sane (ISFIFO needed for Solaris) */
 822         if (!S_ISSOCK(st.st_mode) && !S_ISFIFO(st.st_mode))
 823             fatal_error( "'%s/%s' is not a socket\n", serverdir, SOCKETNAME );
 824         if (st.st_uid != getuid())
 825             fatal_error( "'%s/%s' is not owned by you\n", serverdir, SOCKETNAME );
 826
 827         /* try to connect to it */
 828         addr.sun_family = AF_UNIX;
 829         strcpy( addr.sun_path, SOCKETNAME );
 830         slen = sizeof(addr) - sizeof(addr.sun_path) + strlen(addr.sun_path) + 1;
 831 #ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN
 832         addr.sun_len = slen;
 833 #endif
 834         if ((s = socket( AF_UNIX, SOCK_STREAM, 0 )) == -1) fatal_perror( "socket" );
 835         if (connect( s, (struct sockaddr *)&addr, slen ) != -1)
 836         {
 837             /* switch back to the starting directory */
 838             if (fd_cwd != -1)
 839             {
 840                 fchdir( fd_cwd );
 841                 close( fd_cwd );
 842             }
 843             fcntl( s, F_SETFD, 1 ); /* set close on exec flag */
 844             return s;
 845         }
 846         close( s );
 847     }
 848     server_connect_error( serverdir );
 849 }
 850
 851
 852 #ifdef __APPLE__
 853 #include <mach/mach.h>
 854 #include <mach/mach_error.h>
 855 #include <servers/bootstrap.h>
 856
 857 /* send our task port to the server */
 858 static void send_server_task_port(void)
 859 {
 860     mach_port_t bootstrap_port, wineserver_port;
 861     kern_return_t kret;
 862
 863     struct {
 864         mach_msg_header_t           header;
 865         mach_msg_body_t             body;
 866         mach_msg_port_descriptor_t  task_port;
 867     } msg;
 868
 869     if (task_get_bootstrap_port(mach_task_self(), &bootstrap_port) != KERN_SUCCESS) return;
 870
 871     kret = bootstrap_look_up(bootstrap_port, (char*)wine_get_server_dir(), &wineserver_port);
 872     if (kret != KERN_SUCCESS)
 873         fatal_error( "cannot find the server port: 0x%08x\n", kret );
 874
 875     mach_port_deallocate(mach_task_self(), bootstrap_port);
 876
 877     msg.header.msgh_bits        = MACH_MSGH_BITS(MACH_MSG_TYPE_COPY_SEND, 0) | MACH_MSGH_BITS_COMPLEX;
 878     msg.header.msgh_size        = sizeof(msg);
 879     msg.header.msgh_remote_port = wineserver_port;
 880     msg.header.msgh_local_port  = MACH_PORT_NULL;
 881
 882     msg.body.msgh_descriptor_count  = 1;
 883     msg.task_port.name              = mach_task_self();
 884     msg.task_port.disposition       = MACH_MSG_TYPE_COPY_SEND;
 885     msg.task_port.type              = MACH_MSG_PORT_DESCRIPTOR;
 886
 887     kret = mach_msg_send(&msg.header);
 888     if (kret != KERN_SUCCESS)
 889         server_protocol_error( "mach_msg_send failed: 0x%08x\n", kret );
 890
 891     mach_port_deallocate(mach_task_self(), wineserver_port);
 892 }
 893 #endif  /* __APPLE__ */
 894
 895
 896 /***********************************************************************
 897  *           get_unix_tid
 898  *
 899  * Retrieve the Unix tid to use on the server side for the current thread.
 900  */
 901 static int get_unix_tid(void)
 902 {
 903     int ret = -1;
 904 #if defined(linux) && defined(__i386__)
 905     __asm__("int $0x80" : "=a" (ret) : "0" (224) /* SYS_gettid */);
 906 #elif defined(linux) && defined(__x86_64__)
 907     __asm__("syscall" : "=a" (ret) : "0" (186) /* SYS_gettid */);
 908 #elif defined(__sun)
 909     ret = pthread_self();
 910 #elif defined(__APPLE__)
 911     ret = mach_thread_self();
 912 #elif defined(__FreeBSD__)
 913     long lwpid;
 914     thr_self( &lwpid );
 915     ret = lwpid;
 916 #endif
 917     return ret;
 918 }
 919
 920
 921 /***********************************************************************
 922  *           server_init_process
 923  *
 924  * Start the server and create the initial socket pair.
 925  */
 926 void server_init_process(void)
 927 {
 928     obj_handle_t version;
 929     const char *env_socket = getenv( "WINESERVERSOCKET" );
 930
 931     if (env_socket)
 932     {
 933         fd_socket = atoi( env_socket );
 934         if (fcntl( fd_socket, F_SETFD, 1 ) == -1)
 935             fatal_perror( "Bad server socket %d", fd_socket );
 936         unsetenv( "WINESERVERSOCKET" );
 937     }
 938     else fd_socket = server_connect();
 939
 940     /* setup the signal mask */
 941     sigemptyset( &server_block_set );
 942     sigaddset( &server_block_set, SIGALRM );
 943     sigaddset( &server_block_set, SIGIO );
 944     sigaddset( &server_block_set, SIGINT );
 945     sigaddset( &server_block_set, SIGHUP );
 946     sigaddset( &server_block_set, SIGUSR1 );
 947     sigaddset( &server_block_set, SIGUSR2 );
 948     sigaddset( &server_block_set, SIGCHLD );
 949     pthread_sigmask( SIG_BLOCK, &server_block_set, NULL );
 950
 951     /* receive the first thread request fd on the main socket */
 952     ntdll_get_thread_data()->request_fd = receive_fd( &version );
 953
 954     if (version != SERVER_PROTOCOL_VERSION)
 955         server_protocol_error( "version mismatch %d/%d.\n"
 956                                "Your %s binary was not upgraded correctly,\n"
 957                                "or you have an older one somewhere in your PATH.\n"
 958                                "Or maybe the wrong wineserver is still running?\n",
 959                                version, SERVER_PROTOCOL_VERSION,
 960                                (version > SERVER_PROTOCOL_VERSION) ? "wine" : "wineserver" );
 961 #ifdef __APPLE__
 962     send_server_task_port();
 963 #endif
 964 }
 965
 966
 967 /***********************************************************************
 968  *           server_init_process_done
 969  */
 970 NTSTATUS server_init_process_done(void)
 971 {
 972     PEB *peb = NtCurrentTeb()->Peb;
 973     IMAGE_NT_HEADERS *nt = RtlImageNtHeader( peb->ImageBaseAddress );
 974     NTSTATUS status;
 975
 976     /* Install signal handlers; this cannot be done earlier, since we cannot
 977      * send exceptions to the debugger before the create process event that
 978      * is sent by REQ_INIT_PROCESS_DONE.
 979      * We do need the handlers in place by the time the request is over, so
 980      * we set them up here. If we segfault between here and the server call
 981      * something is very wrong... */
 982     signal_init_process();
 983
 984     /* Signal the parent process to continue */
 985     SERVER_START_REQ( init_process_done )
 986     {
 987         req->module   = wine_server_client_ptr( peb->ImageBaseAddress );
 988 #ifdef __i386__
 989         req->ldt_copy = wine_server_client_ptr( &wine_ldt_copy );
 990 #endif
 991         req->entry    = wine_server_client_ptr( (char *)peb->ImageBaseAddress + nt->OptionalHeader.AddressOfEntryPoint );
 992         req->gui      = (nt->OptionalHeader.Subsystem != IMAGE_SUBSYSTEM_WINDOWS_CUI);
 993         status = wine_server_call( req );
 994     }
 995     SERVER_END_REQ;
 996
 997     return status;
 998 }
 999
1000
1001 /***********************************************************************
1002  *           server_init_thread
1003  *
1004  * Send an init thread request. Return 0 if OK.
1005  */
1006 size_t server_init_thread( void *entry_point )
1007 {
1008     int ret;
1009     int reply_pipe[2];
1010     struct sigaction sig_act;
1011     size_t info_size;
1012
1013     sig_act.sa_handler = SIG_IGN;
1014     sig_act.sa_flags   = 0;
1015     sigemptyset( &sig_act.sa_mask );
1016
1017     /* ignore SIGPIPE so that we get an EPIPE error instead  */
1018     sigaction( SIGPIPE, &sig_act, NULL );
1019     /* automatic child reaping to avoid zombies */
1020 #ifdef SA_NOCLDWAIT
1021     sig_act.sa_flags |= SA_NOCLDWAIT;
1022 #endif
1023     sigaction( SIGCHLD, &sig_act, NULL );
1024
1025     /* create the server->client communication pipes */
1026     if (pipe( reply_pipe ) == -1) server_protocol_perror( "pipe" );
1027     if (pipe( ntdll_get_thread_data()->wait_fd ) == -1) server_protocol_perror( "pipe" );
1028     wine_server_send_fd( reply_pipe[1] );
1029     wine_server_send_fd( ntdll_get_thread_data()->wait_fd[1] );
1030     ntdll_get_thread_data()->reply_fd = reply_pipe[0];
1031     close( reply_pipe[1] );
1032
1033     /* set close on exec flag */
1034     fcntl( ntdll_get_thread_data()->reply_fd, F_SETFD, 1 );
1035     fcntl( ntdll_get_thread_data()->wait_fd[0], F_SETFD, 1 );
1036     fcntl( ntdll_get_thread_data()->wait_fd[1], F_SETFD, 1 );
1037
1038     SERVER_START_REQ( init_thread )
1039     {
1040         req->unix_pid    = getpid();
1041         req->unix_tid    = get_unix_tid();
1042         req->teb         = wine_server_client_ptr( NtCurrentTeb() );
1043         req->entry       = wine_server_client_ptr( entry_point );
1044         req->reply_fd    = reply_pipe[1];
1045         req->wait_fd     = ntdll_get_thread_data()->wait_fd[1];
1046         req->debug_level = (TRACE_ON(server) != 0);
1047         req->cpu         = client_cpu;
1048         ret = wine_server_call( req );
1049         NtCurrentTeb()->ClientId.UniqueProcess = ULongToHandle(reply->pid);
1050         NtCurrentTeb()->ClientId.UniqueThread  = ULongToHandle(reply->tid);
1051         info_size         = reply->info_size;
1052         server_start_time = reply->server_start;
1053     }
1054     SERVER_END_REQ;
1055
1056     if (ret)
1057     {
1058         if (ret == STATUS_NOT_SUPPORTED)
1059         {
1060             static const char * const cpu_arch[] = { "x86", "x86_64", "Alpha", "PowerPC", "Sparc" };
1061             server_protocol_error( "the running wineserver doesn't support the %s architecture.\n",
1062                                    cpu_arch[client_cpu] );
1063         }
1064         else server_protocol_error( "init_thread failed with status %x\n", ret );
1065     }
1066     return info_size;
1067 }