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diff --git a/src/ceph/src/common/signal.cc b/src/ceph/src/common/signal.cc
new file mode 100644
index 0000000..406ff46
--- /dev/null
+++ b/src/ceph/src/common/signal.cc
@@ -0,0 +1,80 @@
+// -*- 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.
+ *
+ */
+
+#include "common/BackTrace.h"
+#include "common/perf_counters.h"
+#include "global/pidfile.h"
+#include "common/debug.h"
+#include "common/signal.h"
+#include "common/config.h"
+
+#include <signal.h>
+#include <sstream>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+std::string signal_mask_to_str()
+{
+  sigset_t old_sigset;
+  if (pthread_sigmask(SIG_SETMASK, NULL, &old_sigset)) {
+    return "(pthread_signmask failed)";
+  }
+
+  ostringstream oss;
+  oss << "show_signal_mask: { ";
+  string sep("");
+  for (int signum = 0; signum < NSIG; ++signum) {
+    if (sigismember(&old_sigset, signum) == 1) {
+      oss << sep << signum;
+      sep = ", ";
+    }
+  }
+  oss << " }";
+  return oss.str();
+}
+
+/* Block the signals in 'siglist'. If siglist == NULL, block all signals. */
+void block_signals(const int *siglist, sigset_t *old_sigset)
+{
+  sigset_t sigset;
+  if (!siglist) {
+    sigfillset(&sigset);
+  }
+  else {
+    int i = 0;
+    sigemptyset(&sigset);
+    while (siglist[i]) {
+      sigaddset(&sigset, siglist[i]);
+      ++i;
+    }
+  }
+  int ret = pthread_sigmask(SIG_BLOCK, &sigset, old_sigset);
+  assert(ret == 0);
+}
+
+void restore_sigset(const sigset_t *old_sigset)
+{
+  int ret = pthread_sigmask(SIG_SETMASK, old_sigset, NULL);
+  assert(ret == 0);
+}
+
+void unblock_all_signals(sigset_t *old_sigset)
+{
+  sigset_t sigset;
+  sigfillset(&sigset);
+  sigdelset(&sigset, SIGKILL);
+  int ret = pthread_sigmask(SIG_UNBLOCK, &sigset, old_sigset);
+  assert(ret == 0);
+}