diff --git a/libc/bionic/sigprocmask.cpp b/libc/bionic/sigprocmask.cpp
new file mode 100644
index 0000000..61e2c63
--- /dev/null
+++ b/libc/bionic/sigprocmask.cpp
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <errno.h>
+#include <pthread.h>
+#include <signal.h>
+
+#include "private/kernel_sigset_t.h"
+
+extern "C" int __rt_sigprocmask(int, const kernel_sigset_t*, kernel_sigset_t*, size_t);
+
+int sigprocmask(int how, const sigset_t* bionic_new_set, sigset_t* bionic_old_set) {
+  kernel_sigset_t new_set;
+  kernel_sigset_t* new_set_ptr = NULL;
+  if (bionic_new_set != NULL) {
+    new_set.set(bionic_new_set);
+    new_set_ptr = &new_set;
+  }
+
+  kernel_sigset_t old_set;
+  if (__rt_sigprocmask(how, new_set_ptr, &old_set, sizeof(old_set)) == -1) {
+    return -1;
+  }
+
+  if (bionic_old_set != NULL) {
+    *bionic_old_set = old_set.bionic;
+  }
+
+  return 0;
+}