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+/**
+ * Copyright (c) 2007-2012, 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.
+ *
+ * @file piper_proc.hh
+ */
+
+#ifndef piper_proc_hh
+#define piper_proc_hh
+
+#include <string>
+
+#include <sys/types.h>
+
+#include "base/auto_fd.hh"
+
+/**
+ * Creates a subprocess that reads data from a pipe and writes it to a file so
+ * lnav can treat it like any other file and do preads.
+ *
+ * TODO: Add support for gzipped files.
+ */
+class piper_proc {
+public:
+    class error : public std::exception {
+    public:
+        error(int err) : e_err(err) {}
+
+        int e_err;
+    };
+
+    /**
+     * Forks a subprocess that will read data from the given file descriptor
+     * and write it to a temporary file.
+     *
+     * @param pipefd The file descriptor to read the file contents from.
+     * @param timestamp True if an ISO 8601 timestamp should be prepended onto
+     *   the lines read from pipefd.
+     * @param filefd The descriptor for the backing file.
+     */
+    piper_proc(auto_fd pipefd, bool timestamp, auto_fd filefd);
+
+    bool has_exited();
+
+    /**
+     * Terminates the child process.
+     */
+    virtual ~piper_proc();
+
+    /** @return The file descriptor for the temporary file. */
+    auto_fd get_fd() { return this->pp_fd.dup(); }
+
+    pid_t get_child_pid() const { return this->pp_child; }
+
+private:
+    /** A file descriptor that refers to the temporary file. */
+    auto_fd pp_fd;
+
+    /** The child process' pid. */
+    pid_t pp_child;
+};
+#endif