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diff --git a/src/shrpx_signal.h b/src/shrpx_signal.h
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+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2015 Tatsuhiro Tsujikawa
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef SHRPX_SIGNAL_H
+#define SHRPX_SIGNAL_H
+
+#include "shrpx.h"
+
+#include <signal.h>
+
+namespace shrpx {
+
+constexpr int REOPEN_LOG_SIGNAL = SIGUSR1;
+constexpr int EXEC_BINARY_SIGNAL = SIGUSR2;
+constexpr int GRACEFUL_SHUTDOWN_SIGNAL = SIGQUIT;
+constexpr int RELOAD_SIGNAL = SIGHUP;
+
+// Blocks all signals.  The previous signal mask is stored into
+// |oldset| if it is not nullptr.  This function returns 0 if it
+// succeeds, or -1.  The errno will indicate the error.
+int shrpx_signal_block_all(sigset_t *oldset);
+
+// Unblocks all signals.  This function returns 0 if it succeeds, or
+// -1.  The errno will indicate the error.
+int shrpx_signal_unblock_all();
+
+// Sets signal mask |set|.  This function returns 0 if it succeeds, or
+// -1.  The errno will indicate the error.
+int shrpx_signal_set(sigset_t *set);
+
+int shrpx_signal_set_main_proc_ign_handler();
+int shrpx_signal_unset_main_proc_ign_handler();
+
+int shrpx_signal_set_worker_proc_ign_handler();
+int shrpx_signal_unset_worker_proc_ign_handler();
+
+} // namespace shrpx
+
+#endif // SHRPX_SIGNAL_H