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 #ifdef _WIN32
  22
  23 #include <stdarg.h>
  24
  25 #include "ntstatus.h"
  26 #define WIN32_NO_STATUS
  27 #include "windef.h"
  28 #include "winbase.h"
  29 #include "winternl.h"
  30 #include "wine/unixlib.h"
  31
  32 static NTSTATUS (__cdecl *p__wine_init_unix_lib)( HMODULE, DWORD, const void *, void * );
  33 static NTSTATUS (WINAPI *p__wine_unix_call)( unixlib_handle_t, unsigned int, void * );
  34
  35 static void load_func( void **func, const char *name, void *def )
  36 {
  37     if (!*func)
  38     {
  39         HMODULE module = GetModuleHandleA( "ntdll.dll" );
  40         void *proc = GetProcAddress( module, name );
  41         InterlockedExchangePointer( func, proc ? proc : def );
  42     }
  43 }
  44 #define LOAD_FUNC(name) load_func( (void **)&p ## name, #name, fallback ## name )
  45
  46 static NTSTATUS __cdecl fallback__wine_init_unix_lib( HMODULE module, DWORD reason, const void *ptr_in, void *ptr_out )
  47 {
  48     return STATUS_DLL_NOT_FOUND;
  49 }
  50
  51 static NTSTATUS __cdecl fallback__wine_unix_call( unixlib_handle_t handle, unsigned int code, void *args )
  52 {
  53     return STATUS_DLL_NOT_FOUND;
  54 }
  55
  56 NTSTATUS __cdecl __wine_init_unix_lib( HMODULE module, DWORD reason, const void *ptr_in, void *ptr_out )
  57 {
  58     LOAD_FUNC( __wine_init_unix_lib );
  59     return p__wine_init_unix_lib( module, reason, ptr_in, ptr_out );
  60 }
  61
  62 NTSTATUS WINAPI __wine_unix_call( unixlib_handle_t handle, unsigned int code, void *args )
  63 {
  64     LOAD_FUNC( __wine_unix_call );
  65     return p__wine_unix_call( handle, code, args );
  66 }
  67
  68 #endif  /* _WIN32 */