Provide IRT process interface

src/untrusted/nacl/stubs/sigprocmask.c

Index: src/untrusted/nacl/stubs/sigprocmask.c
diff --git a/src/untrusted/nacl/stubs/sigprocmask.c b/src/untrusted/nacl/stubs/sigprocmask.c
deleted file mode 100644
index 548a7419bc7bd5eac7016a44588bced6794dfb3b..0000000000000000000000000000000000000000
--- a/src/untrusted/nacl/stubs/sigprocmask.c
+++ /dev/null
@@ -1,18 +0,0 @@
-/*
- * Copyright (c) 2012 The Native Client Authors. All rights reserved.
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-
-/*
- * Stub routine for `sigprocmask' for porting support.
- */
-
-#include <signal.h>
-#include <errno.h>
-
-int sigprocmask(int how, const sigset_t *set, sigset_t *oldset) {
-  errno = ENOSYS;
-  return -1;
-}