added posix_memalign()

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@21974 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/posix/stdlib.h

@@ -49,6 +49,7 @@ extern void		*calloc(size_t nmemb, size_t size);
 extern void		free(void *pointer);
 extern void		*malloc(size_t size);
 extern void		*realloc(void * ptr, size_t size);
+extern int 		posix_memalign(void **memptr, size_t alignment, size_t size);
 
 /* process termination */
 extern void		abort(void);

src/system/libroot/posix/malloc/wrapper.cpp

@@ -274,6 +274,18 @@ memalign(size_t alignment, size_t size)
 }
 
 
+extern "C" int
+posix_memalign(void **memptr, size_t alignment, size_t size)
+{
+	if (!memptr)
+		return EINVAL;
+	*memptr = memalign(alignment, size);
+	if (memptr == NULL)
+		return ENOMEM;
+	return 0;
+}
+
+
 extern "C" void *
 valloc(size_t size)
 {