new file mode 100644
--- /dev/null
+++ b/src/os/unix/ngx_alloc.h
@@ -0,0 +1,42 @@
+
+/*
+ * Copyright (C) Igor Sysoev
+ */
+
+
+#ifndef _NGX_ALLOC_H_INCLUDED_
+#define _NGX_ALLOC_H_INCLUDED_
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+
+
+void *ngx_alloc(size_t size, ngx_log_t *log);
+void *ngx_calloc(size_t size, ngx_log_t *log);
+
+#define ngx_free          free
+
+
+/*
+ * Linux has memalign() or posix_memalign()
+ * Solaris has memalign()
+ * FreeBSD has not memalign() or posix_memalign() but its malloc() alignes
+ * allocations bigger than page size at the page boundary.
+ */
+
+#if (HAVE_POSIX_MEMALIGN || HAVE_MEMALIGN)
+
+void *ngx_memalign(size_t alignment, size_t size, ngx_log_t *log);
+
+#else
+
+#define ngx_memalign(alignment, size, log)  ngx_alloc(size, log)
+
+#endif
+
+
+extern int ngx_pagesize;
+
+
+#endif /* _NGX_ALLOC_H_INCLUDED_ */