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diff --git a/src/ceph/src/common/signal.h b/src/ceph/src/common/signal.h
new file mode 100644
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--- /dev/null
+++ b/src/ceph/src/common/signal.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2011 New Dream Network
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef CEPH_COMMON_SIGNAL_H
+#define CEPH_COMMON_SIGNAL_H
+
+#include <signal.h>
+#include <string>
+
+// Returns a string showing the set of blocked signals for the calling thread.
+// Other threads may have a different set (this is per-thread thing).
+extern std::string signal_mask_to_str();
+
+// Block a list of signals. If siglist == NULL, blocks all signals.
+// If not, the list is terminated with a 0 element.
+//
+// On success, stores the old set of blocked signals in
+// old_sigset. On failure, stores an invalid set of blocked signals in
+// old_sigset.
+extern void block_signals(const int *siglist, sigset_t *old_sigset);
+
+// Restore the set of blocked signals. Will not restore an invalid set of
+// blocked signals.
+extern void restore_sigset(const sigset_t *old_sigset);
+
+// Unblock all signals. On success, stores the old set of blocked signals in
+// old_sigset. On failure, stores an invalid set of blocked signals in
+// old_sigset.
+extern void unblock_all_signals(sigset_t *old_sigset);
+
+#endif