ntdll: Add a helper function for memory allocations through mmap().

dlls/ntdll/unix/server.c

@@ -85,7 +85,6 @@
 #define WIN32_NO_STATUS
 #include "windef.h"
 #include "winnt.h"
-#include "wine/library.h"
 #include "wine/server.h"
 #include "wine/debug.h"
 #include "unix_private.h"
@@ -914,8 +913,8 @@ static BOOL add_fd_to_cache( HANDLE handle, int fd, enum server_fd_type type,
         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 );
+            void *ptr = anon_mmap_alloc( FD_CACHE_BLOCK_SIZE * sizeof(union fd_cache_entry),
+                                         PROT_READ | PROT_WRITE );
             if (ptr == MAP_FAILED) return FALSE;
             fd_cache[entry] = ptr;
         }

dlls/ntdll/unix/unix_private.h

@@ -177,6 +177,7 @@ extern NTSTATUS alloc_object_attributes( const OBJECT_ATTRIBUTES *attr, struct o
                                          data_size_t *ret_len ) DECLSPEC_HIDDEN;
 
 extern void *anon_mmap_fixed( void *start, size_t size, int prot, int flags ) DECLSPEC_HIDDEN;
+extern void *anon_mmap_alloc( size_t size, int prot ) DECLSPEC_HIDDEN;
 extern void virtual_init(void) DECLSPEC_HIDDEN;
 extern NTSTATUS virtual_map_ntdll( int fd, void **module ) DECLSPEC_HIDDEN;
 extern ULONG_PTR get_system_affinity_mask(void) DECLSPEC_HIDDEN;

dlls/ntdll/unix/virtual.c

@@ -217,6 +217,13 @@ void *anon_mmap_fixed( void *start, size_t size, int prot, int flags )
     return mmap( start, size, prot, MAP_PRIVATE | MAP_ANON | MAP_FIXED | flags, -1, 0 );
 }
 
+/* allocate anonymous mmap() memory at any address */
+void *anon_mmap_alloc( size_t size, int prot )
+{
+    return mmap( NULL, size, prot, MAP_PRIVATE | MAP_ANON, -1, 0 );
+}
+
+
 static void mmap_add_reserved_area( void *addr, SIZE_T size )
 {
     struct reserved_area *area;
@@ -756,7 +763,7 @@ static BOOL alloc_pages_vprot( const void *addr, size_t size )
     for (i = idx >> pages_vprot_shift; i < (end + pages_vprot_mask) >> pages_vprot_shift; i++)
     {
         if (pages_vprot[i]) continue;
-        if ((ptr = wine_anon_mmap( NULL, pages_vprot_mask + 1, PROT_READ | PROT_WRITE, 0 )) == (void *)-1)
+        if ((ptr = anon_mmap_alloc( pages_vprot_mask + 1, PROT_READ | PROT_WRITE )) == MAP_FAILED)
             return FALSE;
         pages_vprot[i] = ptr;
     }
@@ -1299,8 +1306,8 @@ static struct file_view *alloc_view(void)
     }
     if (view_block_start == view_block_end)
     {
-        void *ptr = wine_anon_mmap( NULL, view_block_size, PROT_READ | PROT_WRITE, 0 );
-        if (ptr == (void *)-1) return NULL;
+        void *ptr = anon_mmap_alloc( view_block_size, PROT_READ | PROT_WRITE );
+        if (ptr == MAP_FAILED) return NULL;
         view_block_start = ptr;
         view_block_end = view_block_start + view_block_size / sizeof(*view_block_start);
     }
@@ -1746,7 +1753,7 @@ static NTSTATUS map_view( struct file_view **view_ret, void *base, size_t size,
 
         for (;;)
         {
-            if ((ptr = wine_anon_mmap( NULL, view_size, get_unix_prot(vprot), 0 )) == (void *)-1)
+            if ((ptr = anon_mmap_alloc( view_size, get_unix_prot(vprot) )) == MAP_FAILED)
             {
                 if (errno == ENOMEM) return STATUS_NO_MEMORY;
                 return STATUS_INVALID_PARAMETER;
@@ -2405,9 +2412,9 @@ void virtual_init(void)
     if (mmap_enum_reserved_areas( alloc_virtual_heap, &alloc_views, 1 ))
         mmap_remove_reserved_area( alloc_views.base, alloc_views.size );
     else
-        alloc_views.base = wine_anon_mmap( NULL, alloc_views.size, PROT_READ | PROT_WRITE, 0 );
+        alloc_views.base = anon_mmap_alloc( alloc_views.size, PROT_READ | PROT_WRITE );
 
-    assert( alloc_views.base != (void *)-1 );
+    assert( alloc_views.base != MAP_FAILED );
     view_block_start = alloc_views.base;
     view_block_end = view_block_start + view_block_size / sizeof(*view_block_start);
     free_ranges = (void *)((char *)alloc_views.base + view_block_size);