winecrt0: Add a helper function and macro to simplify Unix library usage.

dlls/winecrt0/unix_lib.c

@@ -18,8 +18,6 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  */
 
-#ifdef __WINE_PE_BUILD
-
 #include <stdarg.h>
 
 #include "ntstatus.h"
@@ -29,6 +27,8 @@
 #include "winternl.h"
 #include "wine/unixlib.h"
 
+#ifdef __WINE_PE_BUILD
+
 static NTSTATUS (WINAPI *p__wine_unix_call)( unixlib_handle_t, unsigned int, void * );
 
 static void load_func( void **func, const char *name, void *def )
@@ -54,3 +54,22 @@ NTSTATUS WINAPI __wine_unix_call( unixlib_handle_t handle, unsigned int code, vo
 }
 
 #endif  /* __WINE_PE_BUILD */
+
+static inline void *image_base(void)
+{
+#ifdef __WINE_PE_BUILD
+    extern IMAGE_DOS_HEADER __ImageBase;
+    return (void *)&__ImageBase;
+#else
+    extern IMAGE_NT_HEADERS __wine_spec_nt_header;
+    return (void *)((__wine_spec_nt_header.OptionalHeader.ImageBase + 0xffff) & ~0xffff);
+#endif
+}
+
+unixlib_handle_t __wine_unixlib_handle = 0;
+
+NTSTATUS WINAPI __wine_init_unix_call(void)
+{
+    return NtQueryVirtualMemory( GetCurrentProcess(), image_base(), MemoryWineUnixFuncs,
+                                 &__wine_unixlib_handle, sizeof(__wine_unixlib_handle), NULL );
+}

include/wine/unixlib.h

@@ -21,13 +21,14 @@
 #ifndef __WINE_WINE_UNIXLIB_H
 #define __WINE_WINE_UNIXLIB_H
 
-typedef NTSTATUS (*unixlib_entry_t)( void *args );
 typedef UINT64 unixlib_handle_t;
 
 extern NTSTATUS WINAPI __wine_unix_call( unixlib_handle_t handle, unsigned int code, void *args );
 
 #ifdef WINE_UNIX_LIB
 
+typedef NTSTATUS (*unixlib_entry_t)( void *args );
+
 /* some useful helpers from ntdll */
 extern const char *ntdll_get_build_dir(void);
 extern const char *ntdll_get_data_dir(void);
@@ -264,6 +265,13 @@ static inline ULONG ntdll_wcstoul( const WCHAR *s, WCHAR **end, int base )
 #define wcstol(str,e,b)    ntdll_wcstol(str,e,b)
 #define wcstoul(str,e,b)   ntdll_wcstoul(str,e,b)
 
+#else /* WINE_UNIX_LIB */
+
+extern unixlib_handle_t __wine_unixlib_handle DECLSPEC_HIDDEN;
+extern NTSTATUS WINAPI __wine_init_unix_call(void) DECLSPEC_HIDDEN;
+
+#define WINE_UNIX_CALL(code,args) __wine_unix_call( __wine_unixlib_handle, (code), (args) )
+
 #endif /* WINE_UNIX_LIB */
 
 #endif  /* __WINE_WINE_UNIXLIB_H */