dlls/winecrt0/unix_lib.c

   1 /*
   2  * Support for the Unix part of builtin dlls
   3  *
   4  * Copyright 2019 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 <stdarg.h>
  22
  23 #include "ntstatus.h"
  24 #define WIN32_NO_STATUS
  25 #include "windef.h"
  26 #include "winbase.h"
  27 #include "winternl.h"
  28 #include "wine/unixlib.h"
  29
  30 static inline void *image_base(void)
  31 {
  32 #ifdef __WINE_PE_BUILD
  33     extern IMAGE_DOS_HEADER __ImageBase;
  34     return (void *)&__ImageBase;
  35 #else
  36     extern IMAGE_NT_HEADERS __wine_spec_nt_header;
  37     return (void *)((__wine_spec_nt_header.OptionalHeader.ImageBase + 0xffff) & ~0xffff);
  38 #endif
  39 }
  40
  41 static NTSTATUS WINAPI unix_call_fallback( unixlib_handle_t handle, unsigned int code, void *args )
  42 {
  43     return STATUS_DLL_NOT_FOUND;
  44 }
  45
  46 unixlib_handle_t __wine_unixlib_handle = 0;
  47 NTSTATUS (WINAPI *__wine_unix_call_dispatcher)( unixlib_handle_t, unsigned int, void * ) = unix_call_fallback;
  48
  49 NTSTATUS WINAPI __wine_init_unix_call(void)
  50 {
  51     NTSTATUS status;
  52     HMODULE module = GetModuleHandleW( L"ntdll.dll" );
  53     void **p__wine_unix_call_dispatcher = (void **)GetProcAddress( module, "__wine_unix_call_dispatcher" );
  54
  55     if (!p__wine_unix_call_dispatcher) return STATUS_DLL_NOT_FOUND;
  56     status = NtQueryVirtualMemory( GetCurrentProcess(), image_base(), MemoryWineUnixFuncs,
  57                                    &__wine_unixlib_handle, sizeof(__wine_unixlib_handle), NULL );
  58     if (!status) __wine_unix_call_dispatcher = *p__wine_unix_call_dispatcher;
  59     return status;
  60 }