text: /*
   * Wine server communication
   *
   * Copyright (C) 1998 Alexandre Julliard
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
   */
  
  #include "config.h"
  #include "wine/port.h"
  
  #include <assert.h>
  #include <ctype.h>
  #ifdef HAVE_DIRENT_H
  # include <dirent.h>
  #endif
  #include <errno.h>
  #include <fcntl.h>
  #ifdef HAVE_LWP_H
  #include <lwp.h>
  #endif
  #ifdef HAVE_PTHREAD_NP_H
  # include <pthread_np.h>
  #endif
  #include <signal.h>
  #include <stdarg.h>
  #include <stdio.h>
  #include <string.h>
  #include <sys/types.h>
  #ifdef HAVE_SYS_SOCKET_H
  # include <sys/socket.h>
  #endif
  #ifdef HAVE_SYS_WAIT_H
  #include <sys/wait.h>
  #endif
  #ifdef HAVE_SYS_UN_H
  #include <sys/un.h>
  #endif
  #ifdef HAVE_SYS_MMAN_H
  #include <sys/mman.h>
  #endif
  #ifdef HAVE_SYS_PRCTL_H
  # include <sys/prctl.h>
  #endif
  #ifdef HAVE_SYS_STAT_H
  # include <sys/stat.h>
  #endif
  #ifdef HAVE_SYS_SYSCALL_H
  # include <sys/syscall.h>
  #endif
  #ifdef HAVE_SYS_UIO_H
  #include <sys/uio.h>
  #endif
  #ifdef HAVE_SYS_UCONTEXT_H
  # include <sys/ucontext.h>
  #endif
  #ifdef HAVE_SYS_THR_H
  #include <sys/thr.h>
  #endif
  #ifdef HAVE_UNISTD_H
  # include <unistd.h>
  #endif
  
  #include "ntstatus.h"
  #define WIN32_NO_STATUS
  #include "windef.h"
  #include "winnt.h"
  #include "wine/library.h"
  #include "wine/server.h"
  #include "wine/debug.h"
  #include "ntdll_misc.h"
  
  WINE_DEFAULT_DEBUG_CHANNEL(server);
  
  /* Some versions of glibc don't define this */
  #ifndef SCM_RIGHTS
  #define SCM_RIGHTS 1
  #endif
  
  #ifndef MSG_CMSG_CLOEXEC
  #define MSG_CMSG_CLOEXEC 0
  #endif
  
  #define SOCKETNAME "socket"        /* name of the socket file */
  #define LOCKNAME   "lock"          /* name of the lock file */
  
  #ifdef __i386__
  static const enum cpu_type client_cpu = CPU_x86;
  #elif defined(__x86_64__)
  static const enum cpu_type client_cpu = CPU_x86_64;
  #elif defined(__powerpc__)
  static const enum cpu_type client_cpu = CPU_POWERPC;
  #elif defined(__arm__)
  static const enum cpu_type client_cpu = CPU_ARM;
  #elif defined(__aarch64__)
  static const enum cpu_type client_cpu = CPU_ARM64;
  #else
  #error Unsupported CPU
  #endif
  
  unsigned int server_cpus = 0;
  BOOL is_wow64 = FALSE;
  
  timeout_t server_start_time = 0;  /* time of server startup */
  
  sigset_t server_block_set;  /* signals to block during server calls */
  static int fd_socket = -1;  /* socket to exchange file descriptors with the server */
  static pid_t server_pid;
  
  static RTL_CRITICAL_SECTION fd_cache_section;
  static RTL_CRITICAL_SECTION_DEBUG critsect_debug =
  {
      0, 0, &fd_cache_section,
      { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
        0, 0, { (DWORD_PTR)(__FILE__ ": fd_cache_section") }
  };
  static RTL_CRITICAL_SECTION fd_cache_section = { &critsect_debug, -1, 0, 0, 0, 0 };
  
  /* atomically exchange a 64-bit value */
  static inline LONG64 interlocked_xchg64( LONG64 *dest, LONG64 val )
  {
  #ifdef _WIN64
      return (LONG64)interlocked_xchg_ptr( (void **)dest, (void *)val );
  #else
      LONG64 tmp = *dest;
      while (interlocked_cmpxchg64( dest, val, tmp ) != tmp) tmp = *dest;
      return tmp;
  #endif
  }
  
  #ifdef __GNUC__
  static void fatal_error( const char *err, ... ) __attribute__((noreturn, format(printf,1,2)));
  static void fatal_perror( const char *err, ... ) __attribute__((noreturn, format(printf,1,2)));
  static void server_connect_error( const char *serverdir ) __attribute__((noreturn));
  #endif
  
  /* die on a fatal error; use only during initialization */
  static void fatal_error( const char *err, ... )
  {
      va_list args;
  
      va_start( args, err );
      fprintf( stderr, "wine: " );
      vfprintf( stderr, err, args );
      va_end( args );
      exit(1);
  }
  
  /* die on a fatal error; use only during initialization */
  static void fatal_perror( const char *err, ... )
  {
      va_list args;
  
      va_start( args, err );
      fprintf( stderr, "wine: " );
      vfprintf( stderr, err, args );
      perror( " " );
      va_end( args );
      exit(1);
  }
  
  
  /***********************************************************************
   *           server_protocol_error
   */
  static DECLSPEC_NORETURN void server_protocol_error( const char *err, ... )
  {
      va_list args;
  
      va_start( args, err );
      fprintf( stderr, "wine client error:%x: ", GetCurrentThreadId() );
      vfprintf( stderr, err, args );
      va_end( args );
      abort_thread(1);
  }
  
  
  /***********************************************************************
   *           server_protocol_perror
   */
  static DECLSPEC_NORETURN void server_protocol_perror( const char *err )
  {
      fprintf( stderr, "wine client error:%x: ", GetCurrentThreadId() );
      perror( err );
      abort_thread(1);
  }
  
  
  /***********************************************************************
   *           send_request
   *
   * Send a request to the server.
   */
  static unsigned int send_request( const struct __server_request_info *req )
  {
      unsigned int i;
      int ret;
  
      if (!req->u.req.request_header.request_size)
      {
          if ((ret = write( ntdll_get_thread_data()->request_fd, &req->u.req,
                            sizeof(req->u.req) )) == sizeof(req->u.req)) return STATUS_SUCCESS;
  
      }
      else
      {
          struct iovec vec[__SERVER_MAX_DATA+1];
  
          vec[0].iov_base = (void *)&req->u.req;
          vec[0].iov_len = sizeof(req->u.req);
          for (i = 0; i < req->data_count; i++)
          {
              vec[i+1].iov_base = (void *)req->data[i].ptr;
              vec[i+1].iov_len = req->data[i].size;
          }
          if ((ret = writev( ntdll_get_thread_data()->request_fd, vec, i+1 )) ==
              req->u.req.request_header.request_size + sizeof(req->u.req)) return STATUS_SUCCESS;
      }
  
      if (ret >= 0) server_protocol_error( "partial write %d\n", ret );
      if (errno == EPIPE) abort_thread(0);
      if (errno == EFAULT) return STATUS_ACCESS_VIOLATION;
      server_protocol_perror( "write" );
  }
  
  
  /***********************************************************************
   *           read_reply_data
   *
   * Read data from the reply buffer; helper for wait_reply.
   */
  static void read_reply_data( void *buffer, size_t size )
  {
      int ret;
  
      for (;;)
      {
          if ((ret = read( ntdll_get_thread_data()->reply_fd, buffer, size )) > 0)
          {
              if (!(size -= ret)) return;
              buffer = (char *)buffer + ret;
              continue;
          }
          if (!ret) break;
          if (errno == EINTR) continue;
          if (errno == EPIPE) break;
          server_protocol_perror("read");
      }
      /* the server closed the connection; time to die... */
      abort_thread(0);
  }
  
  
  /***********************************************************************
   *           wait_reply
   *
   * Wait for a reply from the server.
   */
  static inline unsigned int wait_reply( struct __server_request_info *req )
  {
      read_reply_data( &req->u.reply, sizeof(req->u.reply) );
      if (req->u.reply.reply_header.reply_size)
          read_reply_data( req->reply_data, req->u.reply.reply_header.reply_size );
      return req->u.reply.reply_header.error;
  }
  
  
  /***********************************************************************
   *           wine_server_call (NTDLL.@)
   *
   * Perform a server call.
   *
   * PARAMS
   *     req_ptr [I/O] Function dependent data
   *
   * RETURNS
   *     Depends on server function being called, but usually an NTSTATUS code.
   *
   * NOTES
   *     Use the SERVER_START_REQ and SERVER_END_REQ to help you fill out the
   *     server request structure for the particular call. E.g:
   *|     SERVER_START_REQ( event_op )
   *|     {
   *|         req->handle = handle;
   *|         req->op     = SET_EVENT;
   *|         ret = wine_server_call( req );
   *|     }
   *|     SERVER_END_REQ;
   */
  unsigned int wine_server_call( void *req_ptr )
  {
      struct __server_request_info * const req = req_ptr;
      sigset_t old_set;
      unsigned int ret;
  
      pthread_sigmask( SIG_BLOCK, &server_block_set, &old_set );
      ret = send_request( req );
      if (!ret) ret = wait_reply( req );
      pthread_sigmask( SIG_SETMASK, &old_set, NULL );
      return ret;
  }
  
  
  /***********************************************************************
   *           server_enter_uninterrupted_section
   */
  void server_enter_uninterrupted_section( RTL_CRITICAL_SECTION *cs, sigset_t *sigset )
  {
      pthread_sigmask( SIG_BLOCK, &server_block_set, sigset );
      RtlEnterCriticalSection( cs );
  }
  
  
  /***********************************************************************
   *           server_leave_uninterrupted_section
   */
  void server_leave_uninterrupted_section( RTL_CRITICAL_SECTION *cs, sigset_t *sigset )
  {
      RtlLeaveCriticalSection( cs );
      pthread_sigmask( SIG_SETMASK, sigset, NULL );
  }
  
  
  /***********************************************************************
   *              wait_select_reply
   *
   * Wait for a reply on the waiting pipe of the current thread.
   */
  static int wait_select_reply( void *cookie )
  {
      int signaled;
      struct wake_up_reply reply;
      for (;;)
      {
          int ret;
          ret = read( ntdll_get_thread_data()->wait_fd[0], &reply, sizeof(reply) );
          if (ret == sizeof(reply))
          {
              if (!reply.cookie) abort_thread( reply.signaled );  /* thread got killed */
              if (wine_server_get_ptr(reply.cookie) == cookie) return reply.signaled;
              /* we stole another reply, wait for the real one */
              signaled = wait_select_reply( cookie );
              /* and now put the wrong one back in the pipe */
              for (;;)
              {
                  ret = write( ntdll_get_thread_data()->wait_fd[1], &reply, sizeof(reply) );
                  if (ret == sizeof(reply)) break;
                  if (ret >= 0) server_protocol_error( "partial wakeup write %d\n", ret );
                  if (errno == EINTR) continue;
                  server_protocol_perror("wakeup write");
              }
              return signaled;
          }
          if (ret >= 0) server_protocol_error( "partial wakeup read %d\n", ret );
          if (errno == EINTR) continue;
          server_protocol_perror("wakeup read");
      }
  }
  
  
  /***********************************************************************
   *              invoke_apc
   *
   * Invoke a single APC. Return TRUE if a user APC has been run.
   */
  static BOOL invoke_apc( const apc_call_t *call, apc_result_t *result )
  {
      BOOL user_apc = FALSE;
      SIZE_T size;
      void *addr;
  
      memset( result, 0, sizeof(*result) );
  
      switch (call->type)
      {
      case APC_NONE:
          break;
      case APC_USER:
      {
          void (WINAPI *func)(ULONG_PTR,ULONG_PTR,ULONG_PTR) = wine_server_get_ptr( call->user.func );
          func( call->user.args[0], call->user.args[1], call->user.args[2] );
          user_apc = TRUE;
          break;
      }
      case APC_TIMER:
      {
          void (WINAPI *func)(void*, unsigned int, unsigned int) = wine_server_get_ptr( call->timer.func );
          func( wine_server_get_ptr( call->timer.arg ),
                (DWORD)call->timer.time, (DWORD)(call->timer.time >> 32) );
          user_apc = TRUE;
          break;
      }
      case APC_ASYNC_IO:
      {
          void *apc = NULL, *arg = NULL;
          IO_STATUS_BLOCK *iosb = wine_server_get_ptr( call->async_io.sb );
          NTSTATUS (*func)(void *, IO_STATUS_BLOCK *, NTSTATUS, void **, void **) = wine_server_get_ptr( call->async_io.func );
          result->type = call->type;
          result->async_io.status = func( wine_server_get_ptr( call->async_io.user ),
                                          iosb, call->async_io.status, &apc, &arg );
          if (result->async_io.status != STATUS_PENDING)
          {
              result->async_io.total = iosb->Information;
              result->async_io.apc   = wine_server_client_ptr( apc );
              result->async_io.arg   = wine_server_client_ptr( arg );
          }
          break;
      }
      case APC_VIRTUAL_ALLOC:
          result->type = call->type;
          addr = wine_server_get_ptr( call->virtual_alloc.addr );
          size = call->virtual_alloc.size;
          if ((ULONG_PTR)addr == call->virtual_alloc.addr && size == call->virtual_alloc.size)
          {
              result->virtual_alloc.status = NtAllocateVirtualMemory( NtCurrentProcess(), &addr,
                                                                      call->virtual_alloc.zero_bits, &size,
                                                                      call->virtual_alloc.op_type,
                                                                      call->virtual_alloc.prot );
              result->virtual_alloc.addr = wine_server_client_ptr( addr );
              result->virtual_alloc.size = size;
          }
          else result->virtual_alloc.status = STATUS_WORKING_SET_LIMIT_RANGE;
          break;
      case APC_VIRTUAL_FREE:
          result->type = call->type;
          addr = wine_server_get_ptr( call->virtual_free.addr );
          size = call->virtual_free.size;
          if ((ULONG_PTR)addr == call->virtual_free.addr && size == call->virtual_free.size)
          {
              result->virtual_free.status = NtFreeVirtualMemory( NtCurrentProcess(), &addr, &size,
                                                                 call->virtual_free.op_type );
              result->virtual_free.addr = wine_server_client_ptr( addr );
              result->virtual_free.size = size;
          }
          else result->virtual_free.status = STATUS_INVALID_PARAMETER;
          break;
      case APC_VIRTUAL_QUERY:
      {
          MEMORY_BASIC_INFORMATION info;
          result->type = call->type;
          addr = wine_server_get_ptr( call->virtual_query.addr );
          if ((ULONG_PTR)addr == call->virtual_query.addr)
              result->virtual_query.status = NtQueryVirtualMemory( NtCurrentProcess(),
                                                                   addr, MemoryBasicInformation, &info,
                                                                   sizeof(info), NULL );
          else
              result->virtual_query.status = STATUS_WORKING_SET_LIMIT_RANGE;
  
          if (result->virtual_query.status == STATUS_SUCCESS)
          {
              result->virtual_query.base       = wine_server_client_ptr( info.BaseAddress );
              result->virtual_query.alloc_base = wine_server_client_ptr( info.AllocationBase );
              result->virtual_query.size       = info.RegionSize;
              result->virtual_query.prot       = info.Protect;
              result->virtual_query.alloc_prot = info.AllocationProtect;
              result->virtual_query.state      = info.State >> 12;
              result->virtual_query.alloc_type = info.Type >> 16;
          }
          break;
      }
      case APC_VIRTUAL_PROTECT:
          result->type = call->type;
          addr = wine_server_get_ptr( call->virtual_protect.addr );
          size = call->virtual_protect.size;
          if ((ULONG_PTR)addr == call->virtual_protect.addr && size == call->virtual_protect.size)
          {
              result->virtual_protect.status = NtProtectVirtualMemory( NtCurrentProcess(), &addr, &size,
                                                                       call->virtual_protect.prot,
                                                                       &result->virtual_protect.prot );
              result->virtual_protect.addr = wine_server_client_ptr( addr );
              result->virtual_protect.size = size;
          }
          else result->virtual_protect.status = STATUS_INVALID_PARAMETER;
          break;
      case APC_VIRTUAL_FLUSH:
          result->type = call->type;
          addr = wine_server_get_ptr( call->virtual_flush.addr );
          size = call->virtual_flush.size;
          if ((ULONG_PTR)addr == call->virtual_flush.addr && size == call->virtual_flush.size)
          {
              result->virtual_flush.status = NtFlushVirtualMemory( NtCurrentProcess(),
                                                                   (const void **)&addr, &size, 0 );
              result->virtual_flush.addr = wine_server_client_ptr( addr );
              result->virtual_flush.size = size;
          }
          else result->virtual_flush.status = STATUS_INVALID_PARAMETER;
          break;
      case APC_VIRTUAL_LOCK:
          result->type = call->type;
          addr = wine_server_get_ptr( call->virtual_lock.addr );
          size = call->virtual_lock.size;
          if ((ULONG_PTR)addr == call->virtual_lock.addr && size == call->virtual_lock.size)
          {
              result->virtual_lock.status = NtLockVirtualMemory( NtCurrentProcess(), &addr, &size, 0 );
              result->virtual_lock.addr = wine_server_client_ptr( addr );
              result->virtual_lock.size = size;
          }
          else result->virtual_lock.status = STATUS_INVALID_PARAMETER;
          break;
      case APC_VIRTUAL_UNLOCK:
          result->type = call->type;
          addr = wine_server_get_ptr( call->virtual_unlock.addr );
          size = call->virtual_unlock.size;
          if ((ULONG_PTR)addr == call->virtual_unlock.addr && size == call->virtual_unlock.size)
          {
              result->virtual_unlock.status = NtUnlockVirtualMemory( NtCurrentProcess(), &addr, &size, 0 );
              result->virtual_unlock.addr = wine_server_client_ptr( addr );
              result->virtual_unlock.size = size;
          }
          else result->virtual_unlock.status = STATUS_INVALID_PARAMETER;
          break;
      case APC_MAP_VIEW:
          result->type = call->type;
          addr = wine_server_get_ptr( call->map_view.addr );
          size = call->map_view.size;
          if ((ULONG_PTR)addr == call->map_view.addr && size == call->map_view.size)
          {
              LARGE_INTEGER offset;
              offset.QuadPart = call->map_view.offset;
              result->map_view.status = NtMapViewOfSection( wine_server_ptr_handle(call->map_view.handle),
                                                            NtCurrentProcess(), &addr,
                                                            call->map_view.zero_bits, 0,
                                                            &offset, &size, ViewShare,
                                                            call->map_view.alloc_type, call->map_view.prot );
              result->map_view.addr = wine_server_client_ptr( addr );
              result->map_view.size = size;
          }
          else result->map_view.status = STATUS_INVALID_PARAMETER;
          NtClose( wine_server_ptr_handle(call->map_view.handle) );
          break;
      case APC_UNMAP_VIEW:
          result->type = call->type;
          addr = wine_server_get_ptr( call->unmap_view.addr );
          if ((ULONG_PTR)addr == call->unmap_view.addr)
              result->unmap_view.status = NtUnmapViewOfSection( NtCurrentProcess(), addr );
          else
              result->unmap_view.status = STATUS_INVALID_PARAMETER;
          break;
      case APC_CREATE_THREAD:
      {
          CLIENT_ID id;
          HANDLE handle;
          SIZE_T reserve = call->create_thread.reserve;
          SIZE_T commit = call->create_thread.commit;
          void *func = wine_server_get_ptr( call->create_thread.func );
          void *arg  = wine_server_get_ptr( call->create_thread.arg );
  
          result->type = call->type;
          if (reserve == call->create_thread.reserve && commit == call->create_thread.commit &&
              (ULONG_PTR)func == call->create_thread.func && (ULONG_PTR)arg == call->create_thread.arg)
          {
              result->create_thread.status = RtlCreateUserThread( NtCurrentProcess(), NULL,
                                                                  call->create_thread.suspend, NULL,
                                                                  reserve, commit, func, arg, &handle, &id );
              result->create_thread.handle = wine_server_obj_handle( handle );
              result->create_thread.tid = HandleToULong(id.UniqueThread);
          }
          else result->create_thread.status = STATUS_INVALID_PARAMETER;
          break;
      }
      default:
          server_protocol_error( "get_apc_request: bad type %d\n", call->type );
          break;
      }
      return user_apc;
  }
  
  
  /***********************************************************************
   *              server_select
   */
  unsigned int server_select( const select_op_t *select_op, data_size_t size, UINT flags,
                              const LARGE_INTEGER *timeout )
  {
      unsigned int ret;
      int cookie;
      BOOL user_apc = FALSE;
      obj_handle_t apc_handle = 0;
      apc_call_t call;
      apc_result_t result;
      timeout_t abs_timeout = timeout ? timeout->QuadPart : TIMEOUT_INFINITE;
  
      memset( &result, 0, sizeof(result) );
  
      for (;;)
      {
          SERVER_START_REQ( select )
          {
              req->flags    = flags;
              req->cookie   = wine_server_client_ptr( &cookie );
              req->prev_apc = apc_handle;
              req->timeout  = abs_timeout;
              wine_server_add_data( req, &result, sizeof(result) );
              wine_server_add_data( req, select_op, size );
              ret = wine_server_call( req );
              abs_timeout = reply->timeout;
              apc_handle  = reply->apc_handle;
              call        = reply->call;
          }
          SERVER_END_REQ;
          if (ret == STATUS_PENDING) ret = wait_select_reply( &cookie );
          if (ret != STATUS_USER_APC) break;
          if (invoke_apc( &call, &result ))
          {
              /* if we ran a user apc we have to check once more if additional apcs are queued,
               * but we don't want to wait */
              abs_timeout = 0;
              user_apc = TRUE;
              size = 0;
          }
  
          /* don't signal multiple times */
          if (size >= sizeof(select_op->signal_and_wait) && select_op->op == SELECT_SIGNAL_AND_WAIT)
              size = offsetof( select_op_t, signal_and_wait.signal );
      }
  
      if (ret == STATUS_TIMEOUT && user_apc) ret = STATUS_USER_APC;
  
      /* A test on Windows 2000 shows that Windows always yields during
         a wait, but a wait that is hit by an event gets a priority
         boost as well.  This seems to model that behavior the closest.  */
      if (ret == STATUS_TIMEOUT) NtYieldExecution();
  
      return ret;
  }
  
  
  /***********************************************************************
   *           server_queue_process_apc
   */
  unsigned int server_queue_process_apc( HANDLE process, const apc_call_t *call, apc_result_t *result )
  {
      for (;;)
      {
          unsigned int ret;
          HANDLE handle = 0;
          BOOL self = FALSE;
  
          SERVER_START_REQ( queue_apc )
          {
              req->handle = wine_server_obj_handle( process );
              req->call = *call;
              if (!(ret = wine_server_call( req )))
              {
                  handle = wine_server_ptr_handle( reply->handle );
                  self = reply->self;
              }
          }
          SERVER_END_REQ;
          if (ret != STATUS_SUCCESS) return ret;
  
          if (self)
          {
              invoke_apc( call, result );
          }
          else
          {
              NtWaitForSingleObject( handle, FALSE, NULL );
  
              SERVER_START_REQ( get_apc_result )
              {
                  req->handle = wine_server_obj_handle( handle );
                  if (!(ret = wine_server_call( req ))) *result = reply->result;
              }
              SERVER_END_REQ;
  
              if (!ret && result->type == APC_NONE) continue;  /* APC didn't run, try again */
          }
          return ret;
      }
  }
  
  
  /***********************************************************************
   *           wine_server_send_fd   (NTDLL.@)
   *
   * Send a file descriptor to the server.
   *
   * PARAMS
   *     fd [I] file descriptor to send
   *
   * RETURNS
   *     nothing
   */
  void CDECL wine_server_send_fd( int fd )
  {
      struct send_fd data;
      struct msghdr msghdr;
      struct iovec vec;
      int ret;
  
  #ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
      msghdr.msg_accrights    = (void *)&fd;
      msghdr.msg_accrightslen = sizeof(fd);
  #else  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
      char cmsg_buffer[256];
      struct cmsghdr *cmsg;
      msghdr.msg_control    = cmsg_buffer;
      msghdr.msg_controllen = sizeof(cmsg_buffer);
      msghdr.msg_flags      = 0;
      cmsg = CMSG_FIRSTHDR( &msghdr );
      cmsg->cmsg_len   = CMSG_LEN( sizeof(fd) );
      cmsg->cmsg_level = SOL_SOCKET;
      cmsg->cmsg_type  = SCM_RIGHTS;
      *(int *)CMSG_DATA(cmsg) = fd;
      msghdr.msg_controllen = cmsg->cmsg_len;
  #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
  
      msghdr.msg_name    = NULL;
      msghdr.msg_namelen = 0;
      msghdr.msg_iov     = &vec;
      msghdr.msg_iovlen  = 1;
  
      vec.iov_base = (void *)&data;
      vec.iov_len  = sizeof(data);
  
      data.tid = GetCurrentThreadId();
      data.fd  = fd;
  
      for (;;)
      {
          if ((ret = sendmsg( fd_socket, &msghdr, 0 )) == sizeof(data)) return;
          if (ret >= 0) server_protocol_error( "partial write %d\n", ret );
          if (errno == EINTR) continue;
          if (errno == EPIPE) abort_thread(0);
          server_protocol_perror( "sendmsg" );
      }
  }
  
  
  /***********************************************************************
   *           receive_fd
   *
   * Receive a file descriptor passed from the server.
   */
  static int receive_fd( obj_handle_t *handle )
  {
      struct iovec vec;
      struct msghdr msghdr;
      int ret, fd = -1;
  
  #ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
      msghdr.msg_accrights    = (void *)&fd;
      msghdr.msg_accrightslen = sizeof(fd);
  #else  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
      char cmsg_buffer[256];
      msghdr.msg_control    = cmsg_buffer;
      msghdr.msg_controllen = sizeof(cmsg_buffer);
      msghdr.msg_flags      = 0;
  #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
  
      msghdr.msg_name    = NULL;
      msghdr.msg_namelen = 0;
      msghdr.msg_iov     = &vec;
      msghdr.msg_iovlen  = 1;
      vec.iov_base = (void *)handle;
      vec.iov_len  = sizeof(*handle);
  
      for (;;)
      {
          if ((ret = recvmsg( fd_socket, &msghdr, MSG_CMSG_CLOEXEC )) > 0)
          {
  #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
              struct cmsghdr *cmsg;
              for (cmsg = CMSG_FIRSTHDR( &msghdr ); cmsg; cmsg = CMSG_NXTHDR( &msghdr, cmsg ))
              {
                  if (cmsg->cmsg_level != SOL_SOCKET) continue;
                  if (cmsg->cmsg_type == SCM_RIGHTS) fd = *(int *)CMSG_DATA(cmsg);
  #ifdef SCM_CREDENTIALS
                  else if (cmsg->cmsg_type == SCM_CREDENTIALS)
                  {
                      struct ucred *ucred = (struct ucred *)CMSG_DATA(cmsg);
                      server_pid = ucred->pid;
                  }
  #endif
              }
  #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
              if (fd != -1) fcntl( fd, F_SETFD, FD_CLOEXEC ); /* in case MSG_CMSG_CLOEXEC is not supported */
              return fd;
          }
          if (!ret) break;
          if (errno == EINTR) continue;
          if (errno == EPIPE) break;
          server_protocol_perror("recvmsg");
      }
      /* the server closed the connection; time to die... */
      abort_thread(0);
  }
  
  
  /***********************************************************************/
  /* fd cache support */
  
  #include "pshpack1.h"
  union fd_cache_entry
  {
      LONG64 data;
      struct
      {
          int fd;
          enum server_fd_type type : 5;
          unsigned int        access : 3;
          unsigned int        options : 24;
      } s;
  };
  #include "poppack.h"
  
  C_ASSERT( sizeof(union fd_cache_entry) == sizeof(LONG64) );
  
  #define FD_CACHE_BLOCK_SIZE  (65536 / sizeof(union fd_cache_entry))
  #define FD_CACHE_ENTRIES     128
  
  static union fd_cache_entry *fd_cache[FD_CACHE_ENTRIES];
  static union fd_cache_entry fd_cache_initial_block[FD_CACHE_BLOCK_SIZE];
  
  static inline unsigned int handle_to_index( HANDLE handle, unsigned int *entry )
  {
      unsigned int idx = (wine_server_obj_handle(handle) >> 2) - 1;
      *entry = idx / FD_CACHE_BLOCK_SIZE;
      return idx % FD_CACHE_BLOCK_SIZE;
  }
  
  
  /***********************************************************************
   *           add_fd_to_cache
   *
   * Caller must hold fd_cache_section.
   */
  static BOOL add_fd_to_cache( HANDLE handle, int fd, enum server_fd_type type,
                              unsigned int access, unsigned int options )
  {
      unsigned int entry, idx = handle_to_index( handle, &entry );
      union fd_cache_entry cache;
  
      if (entry >= FD_CACHE_ENTRIES)
      {
          FIXME( "too many allocated handles, not caching %p\n", handle );
          return FALSE;
      }
  
      if (!fd_cache[entry])  /* do we need to allocate a new block of entries? */
      {
          if (!entry) fd_cache[0] = fd_cache_initial_block;
          else
          {
              void *ptr = wine_anon_mmap( NULL, FD_CACHE_BLOCK_SIZE * sizeof(union fd_cache_entry),
                                          PROT_READ | PROT_WRITE, 0 );
              if (ptr == MAP_FAILED) return FALSE;
              fd_cache[entry] = ptr;
          }
      }
  
      /* store fd+1 so that 0 can be used as the unset value */
      cache.s.fd = fd + 1;
      cache.s.type = type;
      cache.s.access = access;
      cache.s.options = options;
      cache.data = interlocked_xchg64( &fd_cache[entry][idx].data, cache.data );
      assert( !cache.s.fd );
      return TRUE;
  }
  
  
  /***********************************************************************
   *           get_cached_fd
   */
  static inline int get_cached_fd( HANDLE handle, enum server_fd_type *type,
                                   unsigned int *access, unsigned int *options )
  {
      unsigned int entry, idx = handle_to_index( handle, &entry );
      int fd = -1;
  
      if (entry < FD_CACHE_ENTRIES && fd_cache[entry])
      {
          union fd_cache_entry cache;
          cache.data = interlocked_cmpxchg64( &fd_cache[entry][idx].data, 0, 0 );
          fd = cache.s.fd - 1;
          if (type) *type = cache.s.type;
          if (access) *access = cache.s.access;
          if (options) *options = cache.s.options;
      }
      return fd;
  }
  
  
  /***********************************************************************
   *           server_remove_fd_from_cache
   */
  int server_remove_fd_from_cache( HANDLE handle )
  {
      unsigned int entry, idx = handle_to_index( handle, &entry );
      int fd = -1;
  
      if (entry < FD_CACHE_ENTRIES && fd_cache[entry])
      {
          union fd_cache_entry cache;
          cache.data = interlocked_xchg64( &fd_cache[entry][idx].data, 0 );
          fd = cache.s.fd - 1;
      }
  
      return fd;
  }
  
  
  /***********************************************************************
   *           server_get_unix_fd
   *
   * The returned unix_fd should be closed iff needs_close is non-zero.
   */
  int server_get_unix_fd( HANDLE handle, unsigned int wanted_access, int *unix_fd,
                          int *needs_close, enum server_fd_type *type, unsigned int *options )
  {
      sigset_t sigset;
      obj_handle_t fd_handle;
      int ret = 0, fd;
      unsigned int access = 0;
  
      *unix_fd = -1;
      *needs_close = 0;
      wanted_access &= FILE_READ_DATA | FILE_WRITE_DATA | FILE_APPEND_DATA;
  
      fd = get_cached_fd( handle, type, &access, options );
      if (fd != -1) goto done;
  
      server_enter_uninterrupted_section( &fd_cache_section, &sigset );
      fd = get_cached_fd( handle, type, &access, options );
      if (fd == -1)
      {
          SERVER_START_REQ( get_handle_fd )
          {
              req->handle = wine_server_obj_handle( handle );
              if (!(ret = wine_server_call( req )))
              {
                  if (type) *type = reply->type;
                  if (options) *options = reply->options;
                  access = reply->access;
                  if ((fd = receive_fd( &fd_handle )) != -1)
                  {
                      assert( wine_server_ptr_handle(fd_handle) == handle );
                      *needs_close = (!reply->cacheable ||
                                      !add_fd_to_cache( handle, fd, reply->type,
                                                        reply->access, reply->options ));
                  }
                  else ret = STATUS_TOO_MANY_OPENED_FILES;
              }
          }
          SERVER_END_REQ;
      }
      server_leave_uninterrupted_section( &fd_cache_section, &sigset );
  
  done:
      if (!ret && ((access & wanted_access) != wanted_access))
      {
          ret = STATUS_ACCESS_DENIED;
          if (*needs_close) close( fd );
      }
      if (!ret) *unix_fd = fd;
      return ret;
  }
  
  
  /***********************************************************************
   *           wine_server_fd_to_handle   (NTDLL.@)
   *
   * Allocate a file handle for a Unix file descriptor.
   *
   * PARAMS
   *     fd      [I] Unix file descriptor.
   *     access  [I] Win32 access flags.
   *     attributes [I] Object attributes.
   *     handle  [O] Address where Wine file handle will be stored.
   *
   * RETURNS
   *     NTSTATUS code
   */
  int CDECL wine_server_fd_to_handle( int fd, unsigned int access, unsigned int attributes, HANDLE *handle )
  {
      int ret;
  
      *handle = 0;
      wine_server_send_fd( fd );
  
      SERVER_START_REQ( alloc_file_handle )
      {
          req->access     = access;
          req->attributes = attributes;
          req->fd         = fd;
          if (!(ret = wine_server_call( req ))) *handle = wine_server_ptr_handle( reply->handle );
      }
      SERVER_END_REQ;
      return ret;
  }
  
  
  /***********************************************************************
   *           wine_server_handle_to_fd   (NTDLL.@)
   *
   * Retrieve the file descriptor corresponding to a file handle.
   *
   * PARAMS
   *     handle  [I] Wine file handle.
   *     access  [I] Win32 file access rights requested.
   *     unix_fd [O] Address where Unix file descriptor will be stored.
   *     options [O] Address where the file open options will be stored. Optional.
   *
   * RETURNS
   *     NTSTATUS code
   */
  int CDECL wine_server_handle_to_fd( HANDLE handle, unsigned int access, int *unix_fd,
                                unsigned int *options )
  {
      int needs_close, ret = server_get_unix_fd( handle, access, unix_fd, &needs_close, NULL, options );
  
      if (!ret && !needs_close)
      {
          if ((*unix_fd = dup(*unix_fd)) == -1) ret = FILE_GetNtStatus();
      }
      return ret;
  }
  
  
  /***********************************************************************
   *           wine_server_release_fd   (NTDLL.@)
   *
   * Release the Unix file descriptor returned by wine_server_handle_to_fd.
   *
   * PARAMS
   *     handle  [I] Wine file handle.
   *     unix_fd [I] Unix file descriptor to release.
   *
   * RETURNS
   *     nothing
   */
  void CDECL wine_server_release_fd( HANDLE handle, int unix_fd )
  {
      close( unix_fd );
  }
  
  
  /***********************************************************************
   *           server_pipe
   *
   * Create a pipe for communicating with the server.
   */
  int server_pipe( int fd[2] )
  {
      int ret;
  #ifdef HAVE_PIPE2
      static BOOL have_pipe2 = TRUE;
  
      if (have_pipe2)
      {
          if (!(ret = pipe2( fd, O_CLOEXEC ))) return ret;
          if (errno == ENOSYS || errno == EINVAL) have_pipe2 = FALSE;  /* don't try again */
      }
  #endif
      if (!(ret = pipe( fd )))
      {
          fcntl( fd[0], F_SETFD, FD_CLOEXEC );
          fcntl( fd[1], F_SETFD, FD_CLOEXEC );
      }
      return ret;
  }
  
  
  /***********************************************************************
   *           start_server
   *
   * Start a new wine server.
   */
  static void start_server(void)
  {
      static BOOL started;  /* we only try once */
      char *argv[3];
      static char wineserver[] = "server/wineserver";
      static char debug[] = "-d";
  
      if (!started)
      {
          int status;
          int pid = fork();
          if (pid == -1) fatal_perror( "fork" );
          if (!pid)
          {
              argv[0] = wineserver;
              argv[1] = TRACE_ON(server) ? debug : NULL;
              argv[2] = NULL;
              wine_exec_wine_binary( argv[0], argv, getenv("WINESERVER") );
              fatal_error( "could not exec wineserver\n" );
          }
          waitpid( pid, &status, 0 );
          status = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
          if (status == 2) return;  /* server lock held by someone else, will retry later */
          if (status) exit(status);  /* server failed */
          started = TRUE;
      }
  }
  
  
  /***********************************************************************
   *           setup_config_dir
   *
   * Setup the wine configuration dir.
   */
  static void setup_config_dir(void)
  {
      const char *p, *config_dir = wine_get_config_dir();
  
      if (chdir( config_dir ) == -1)
      {
          if (errno != ENOENT) fatal_perror( "chdir to %s\n", config_dir );
  
          if ((p = strrchr( config_dir, '/' )) && p != config_dir)
          {
              struct stat st;
              char *tmp_dir;
  
              if (!(tmp_dir = malloc( p + 1 - config_dir ))) fatal_error( "out of memory\n" );
              memcpy( tmp_dir, config_dir, p - config_dir );
              tmp_dir[p - config_dir] = 0;
              if (!stat( tmp_dir, &st ) && st.st_uid != getuid())
                  fatal_error( "'%s' is not owned by you, refusing to create a configuration directory there\n",
                               tmp_dir );
              free( tmp_dir );
          }
  
          mkdir( config_dir, 0777 );
          if (chdir( config_dir ) == -1) fatal_perror( "chdir to %s\n", config_dir );
  
          if ((p = getenv( "WINEARCH" )) && !strcmp( p, "win32" ))
          {
              /* force creation of a 32-bit prefix */
              int fd = open( "system.reg", O_WRONLY | O_CREAT | O_EXCL, 0666 );
              if (fd != -1)
              {
                  static const char regfile[] = "WINE REGISTRY Version 2\n\n#arch=win32\n";
                  write( fd, regfile, sizeof(regfile) - 1 );
                  close( fd );
              }
          }
          MESSAGE( "wine: created the configuration directory '%s'\n", config_dir );
      }
  
      if (mkdir( "dosdevices", 0777 ) == -1)
      {
          if (errno == EEXIST) return;
          fatal_perror( "cannot create %s/dosdevices\n", config_dir );
      }
  
      /* create the drive symlinks */
  
      mkdir( "drive_c", 0777 );
      symlink( "../drive_c", "dosdevices/c:" );
      symlink( "/", "dosdevices/z:" );
  }
  
  
  /***********************************************************************
   *           server_connect_error
   *
   * Try to display a meaningful explanation of why we couldn't connect
   * to the server.
   */
  static void server_connect_error( const char *serverdir )
  {
      int fd;
      struct flock fl;
  
      if ((fd = open( LOCKNAME, O_WRONLY )) == -1)
          fatal_error( "for some mysterious reason, the wine server never started.\n" );
  
      fl.l_type   = F_WRLCK;
      fl.l_whence = SEEK_SET;
      fl.l_start  = 0;
      fl.l_len    = 1;
      if (fcntl( fd, F_GETLK, &fl ) != -1)
      {
          if (fl.l_type == F_WRLCK)  /* the file is locked */
              fatal_error( "a wine server seems to be running, but I cannot connect to it.\n"
                           "   You probably need to kill that process (it might be pid %d).\n",
                           (int)fl.l_pid );
          fatal_error( "for some mysterious reason, the wine server failed to run.\n" );
      }
      fatal_error( "the file system of '%s' doesn't support locks,\n"
            "   and there is a 'socket' file in that directory that prevents wine from starting.\n"
            "   You should make sure no wine server is running, remove that file and try again.\n",
                   serverdir );
  }
  
  
  /***********************************************************************
   *           server_connect
   *
   * Attempt to connect to an existing server socket.
   * We need to be in the server directory already.
   */
  static int server_connect(void)
  {
      const char *serverdir;
      struct sockaddr_un addr;
      struct stat st;
      int s, slen, retry, fd_cwd;
  
      /* retrieve the current directory */
      fd_cwd = open( ".", O_RDONLY );
      if (fd_cwd != -1) fcntl( fd_cwd, F_SETFD, 1 ); /* set close on exec flag */
  
      setup_config_dir();
      serverdir = wine_get_server_dir();
  
      /* chdir to the server directory */
      if (chdir( serverdir ) == -1)
      {
          if (errno != ENOENT) fatal_perror( "chdir to %s", serverdir );
          start_server();
          if (chdir( serverdir ) == -1) fatal_perror( "chdir to %s", serverdir );
      }
  
      /* make sure we are at the right place */
      if (stat( ".", &st ) == -1) fatal_perror( "stat %s", serverdir );
      if (st.st_uid != getuid()) fatal_error( "'%s' is not owned by you\n", serverdir );
      if (st.st_mode & 077) fatal_error( "'%s' must not be accessible by other users\n", serverdir );
  
      for (retry = 0; retry < 6; retry++)
      {
          /* if not the first try, wait a bit to leave the previous server time to exit */
          if (retry)
          {
              usleep( 100000 * retry * retry );
              start_server();
              if (lstat( SOCKETNAME, &st ) == -1) continue;  /* still no socket, wait a bit more */
          }
          else if (lstat( SOCKETNAME, &st ) == -1) /* check for an already existing socket */
          {
              if (errno != ENOENT) fatal_perror( "lstat %s/%s", serverdir, SOCKETNAME );
              start_server();
              if (lstat( SOCKETNAME, &st ) == -1) continue;  /* still no socket, wait a bit more */
          }
  
          /* make sure the socket is sane (ISFIFO needed for Solaris) */
          if (!S_ISSOCK(st.st_mode) && !S_ISFIFO(st.st_mode))
              fatal_error( "'%s/%s' is not a socket\n", serverdir, SOCKETNAME );
          if (st.st_uid != getuid())
              fatal_error( "'%s/%s' is not owned by you\n", serverdir, SOCKETNAME );
  
          /* try to connect to it */
          addr.sun_family = AF_UNIX;
          strcpy( addr.sun_path, SOCKETNAME );
          slen = sizeof(addr) - sizeof(addr.sun_path) + strlen(addr.sun_path) + 1;
  #ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN
          addr.sun_len = slen;
  #endif
          if ((s = socket( AF_UNIX, SOCK_STREAM, 0 )) == -1) fatal_perror( "socket" );
  #ifdef SO_PASSCRED
          else
          {
              int enable = 1;
              setsockopt( s, SOL_SOCKET, SO_PASSCRED, &enable, sizeof(enable) );
          }
  #endif
          if (connect( s, (struct sockaddr *)&addr, slen ) != -1)
          {
              /* switch back to the starting directory */
              if (fd_cwd != -1)
              {
                  fchdir( fd_cwd );
                  close( fd_cwd );
              }
              fcntl( s, F_SETFD, 1 ); /* set close on exec flag */
              return s;
          }
          close( s );
      }
      server_connect_error( serverdir );
  }
  
  
  #ifdef __APPLE__
  #include <mach/mach.h>
  #include <mach/mach_error.h>
  #include <servers/bootstrap.h>
  
  /* send our task port to the server */
  static void send_server_task_port(void)
  {
      mach_port_t bootstrap_port, wineserver_port;
      kern_return_t kret;
  
      struct {
          mach_msg_header_t           header;
          mach_msg_body_t             body;
          mach_msg_port_descriptor_t  task_port;
      } msg;
  
      if (task_get_bootstrap_port(mach_task_self(), &bootstrap_port) != KERN_SUCCESS) return;
  
      kret = bootstrap_look_up(bootstrap_port, (char*)wine_get_server_dir(), &wineserver_port);
      if (kret != KERN_SUCCESS)
          fatal_error( "cannot find the server port: 0x%08x\n", kret );
  
      mach_port_deallocate(mach_task_self(), bootstrap_port);
  
      msg.header.msgh_bits        = MACH_MSGH_BITS(MACH_MSG_TYPE_COPY_SEND, 0) | MACH_MSGH_BITS_COMPLEX;
      msg.header.msgh_size        = sizeof(msg);
      msg.header.msgh_remote_port = wineserver_port;
      msg.header.msgh_local_port  = MACH_PORT_NULL;
  
      msg.body.msgh_descriptor_count  = 1;
      msg.task_port.name              = mach_task_self();
      msg.task_port.disposition       = MACH_MSG_TYPE_COPY_SEND;
      msg.task_port.type              = MACH_MSG_PORT_DESCRIPTOR;
  
      kret = mach_msg_send(&msg.header);
      if (kret != KERN_SUCCESS)
          server_protocol_error( "mach_msg_send failed: 0x%08x\n", kret );
  
      mach_port_deallocate(mach_task_self(), wineserver_port);
  }
  #endif  /* __APPLE__ */
  
  
  /***********************************************************************
   *           get_unix_tid
   *
   * Retrieve the Unix tid to use on the server side for the current thread.
   */
  static int get_unix_tid(void)
  {
      int ret = -1;
  #ifdef HAVE_PTHREAD_GETTHREADID_NP
      ret = pthread_getthreadid_np();
  #elif defined(linux)
      ret = syscall( __NR_gettid );
  #elif defined(__sun)
      ret = pthread_self();
  #elif defined(__APPLE__)
      ret = mach_thread_self();
      mach_port_deallocate(mach_task_self(), ret);
  #elif defined(__NetBSD__)
      ret = _lwp_self();
  #elif defined(__FreeBSD__)
      long lwpid;
      thr_self( &lwpid );
      ret = lwpid;
  #elif defined(__DragonFly__)
      ret = lwp_gettid();
  #endif
      return ret;
  }
  
  
  /***********************************************************************
   *           server_init_process
   *
   * Start the server and create the initial socket pair.
   */
  void server_init_process(void)
  {
      obj_handle_t version;
      const char *env_socket = getenv( "WINESERVERSOCKET" );
  
      server_pid = -1;
      if (env_socket)
      {
          fd_socket = atoi( env_socket );
          if (fcntl( fd_socket, F_SETFD, 1 ) == -1)
              fatal_perror( "Bad server socket %d", fd_socket );
          unsetenv( "WINESERVERSOCKET" );
      }
      else fd_socket = server_connect();
  
      /* setup the signal mask */
      sigemptyset( &server_block_set );
      sigaddset( &server_block_set, SIGALRM );
      sigaddset( &server_block_set, SIGIO );
      sigaddset( &server_block_set, SIGINT );
      sigaddset( &server_block_set, SIGHUP );
      sigaddset( &server_block_set, SIGUSR1 );
      sigaddset( &server_block_set, SIGUSR2 );
      sigaddset( &server_block_set, SIGCHLD );
      pthread_sigmask( SIG_BLOCK, &server_block_set, NULL );
  
      /* receive the first thread request fd on the main socket */
      ntdll_get_thread_data()->request_fd = receive_fd( &version );
  
  #ifdef SO_PASSCRED
      /* now that we hopefully received the server_pid, disable SO_PASSCRED */
      {
          int enable = 0;
          setsockopt( fd_socket, SOL_SOCKET, SO_PASSCRED, &enable, sizeof(enable) );
      }
  #endif
  
      if (version != SERVER_PROTOCOL_VERSION)
          server_protocol_error( "version mismatch %d/%d.\n"
                                 "Your %s binary was not upgraded correctly,\n"
                                 "or you have an older one somewhere in your PATH.\n"
                                 "Or maybe the wrong wineserver is still running?\n",
                                 version, SERVER_PROTOCOL_VERSION,
                                 (version > SERVER_PROTOCOL_VERSION) ? "wine" : "wineserver" );
  #ifdef __APPLE__
      send_server_task_port();
  #endif
  #if defined(__linux__) && defined(HAVE_PRCTL)
      /* work around Ubuntu's ptrace breakage */
      if (server_pid != -1) prctl( 0x59616d61 /* PR_SET_PTRACER */, server_pid );
  #endif
  }
  
  
  /***********************************************************************
   *           server_init_process_done
   */
  NTSTATUS server_init_process_done(void)
  {
      PEB *peb = NtCurrentTeb()->Peb;
      IMAGE_NT_HEADERS *nt = RtlImageNtHeader( peb->ImageBaseAddress );
      NTSTATUS status;
  
      /* Install signal handlers; this cannot be done earlier, since we cannot
       * send exceptions to the debugger before the create process event that
       * is sent by REQ_INIT_PROCESS_DONE.
       * We do need the handlers in place by the time the request is over, so
       * we set them up here. If we segfault between here and the server call
       * something is very wrong... */
      signal_init_process();
  
      /* Signal the parent process to continue */
      SERVER_START_REQ( init_process_done )
      {
          req->module   = wine_server_client_ptr( peb->ImageBaseAddress );
  #ifdef __i386__
          req->ldt_copy = wine_server_client_ptr( &wine_ldt_copy );
  #endif
          req->entry    = wine_server_client_ptr( (char *)peb->ImageBaseAddress + nt->OptionalHeader.AddressOfEntryPoint );
          req->gui      = (nt->OptionalHeader.Subsystem != IMAGE_SUBSYSTEM_WINDOWS_CUI);
          status = wine_server_call( req );
      }
      SERVER_END_REQ;
  
      return status;
  }
  
  
  /***********************************************************************
   *           server_init_thread
   *
   * Send an init thread request. Return 0 if OK.
   */
  size_t server_init_thread( void *entry_point )
  {
      static const char *cpu_names[] = { "x86", "x86_64", "PowerPC", "ARM", "ARM64" };
      static const BOOL is_win64 = (sizeof(void *) > sizeof(int));
      const char *arch = getenv( "WINEARCH" );
      int ret;
      int reply_pipe[2];
      struct sigaction sig_act;
      size_t info_size;
  
      sig_act.sa_handler = SIG_IGN;
      sig_act.sa_flags   = 0;
      sigemptyset( &sig_act.sa_mask );
  
      /* ignore SIGPIPE so that we get an EPIPE error instead  */
      sigaction( SIGPIPE, &sig_act, NULL );
  
      /* create the server->client communication pipes */
      if (server_pipe( reply_pipe ) == -1) server_protocol_perror( "pipe" );
      if (server_pipe( ntdll_get_thread_data()->wait_fd ) == -1) server_protocol_perror( "pipe" );
      wine_server_send_fd( reply_pipe[1] );
      wine_server_send_fd( ntdll_get_thread_data()->wait_fd[1] );
      ntdll_get_thread_data()->reply_fd = reply_pipe[0];
      close( reply_pipe[1] );
  
      SERVER_START_REQ( init_thread )
      {
          req->unix_pid    = getpid();
          req->unix_tid    = get_unix_tid();
          req->teb         = wine_server_client_ptr( NtCurrentTeb() );
          req->entry       = wine_server_client_ptr( entry_point );
          req->reply_fd    = reply_pipe[1];
          req->wait_fd     = ntdll_get_thread_data()->wait_fd[1];
          req->debug_level = (TRACE_ON(server) != 0);
          req->cpu         = client_cpu;
          ret = wine_server_call( req );
          NtCurrentTeb()->ClientId.UniqueProcess = ULongToHandle(reply->pid);
          NtCurrentTeb()->ClientId.UniqueThread  = ULongToHandle(reply->tid);
          info_size         = reply->info_size;
          server_start_time = reply->server_start;
          server_cpus       = reply->all_cpus;
      }
      SERVER_END_REQ;
  
      is_wow64 = !is_win64 && (server_cpus & ((1 << CPU_x86_64) | (1 << CPU_ARM64))) != 0;
      ntdll_get_thread_data()->wow64_redir = is_wow64;
  
      switch (ret)
      {
      case STATUS_SUCCESS:
          if (arch)
          {
              if (!strcmp( arch, "win32" ) && (is_win64 || is_wow64))
                  fatal_error( "WINEARCH set to win32 but '%s' is a 64-bit installation.\n",
                               wine_get_config_dir() );
              if (!strcmp( arch, "win64" ) && !is_win64 && !is_wow64)
                  fatal_error( "WINEARCH set to win64 but '%s' is a 32-bit installation.\n",
                               wine_get_config_dir() );
          }
          return info_size;
      case STATUS_INVALID_IMAGE_WIN_64:
          fatal_error( "'%s' is a 32-bit installation, it cannot support 64-bit applications.\n",
                       wine_get_config_dir() );
      case STATUS_NOT_SUPPORTED:
          fatal_error( "'%s' is a 64-bit installation, it cannot be used with a 32-bit wineserver.\n",
                       wine_get_config_dir() );
      case STATUS_INVALID_IMAGE_FORMAT:
          fatal_error( "wineserver doesn't support the %s architecture\n", cpu_names[client_cpu] );
      default:
          server_protocol_error( "init_thread failed with status %x\n", ret );
      }
  }
  