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+/**
+ * Copyright (c) 2022, Timothy Stack
+ *
+ * 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.
+ * * Neither the name of Timothy Stack nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+ */
+
+#ifndef lnav_pollable_hh
+#define lnav_pollable_hh
+
+#include <memory>
+#include <vector>
+
+#include <poll.h>
+
+#include "base/bus.hh"
+
+class pollable_supervisor;
+
+class pollable {
+public:
+    enum class category {
+        background,
+        interactive,
+    };
+
+    pollable(std::shared_ptr<pollable_supervisor> supervisor, category cat);
+
+    pollable(const pollable&) = delete;
+
+    virtual ~pollable();
+
+    category get_category() const { return this->p_category; }
+
+    virtual void update_poll_set(std::vector<struct pollfd>& pollfds) = 0;
+
+    virtual void check_poll_set(const std::vector<struct pollfd>& pollfds) = 0;
+
+private:
+    std::shared_ptr<pollable_supervisor> p_supervisor;
+    const category p_category;
+};
+
+class pollable_supervisor : public bus<pollable> {
+public:
+    struct update_result {
+        size_t ur_background{0};
+        size_t ur_interactive{0};
+    };
+
+    update_result update_poll_set(std::vector<struct pollfd>& pollfds);
+
+    void check_poll_set(const std::vector<struct pollfd>& pollfds);
+
+    size_t count(pollable::category cat);
+};
+
+short pollfd_revents(const std::vector<struct pollfd>& pollfds, int fd);
+
+bool pollfd_ready(const std::vector<struct pollfd>& pollfds,
+                  int fd,
+                  short events = POLLIN | POLLHUP);
+
+#endif