Remove timeouts from remote communication loop.

The select() now blocks until there's work to do instead of relying on a
small timeout value which can cause unproductive use of cpu cycles.

src/Pipe.h

@@ -0,0 +1,57 @@
+// See the file "COPYING" in the main distribution directory for copyright.
+
+#ifndef BRO_PIPE_H
+#define BRO_PIPE_H
+
+namespace bro {
+
+class Pipe {
+public:
+
+	/**
+	 * Create a pair of file descriptors via pipe(), or aborts if it cannot.
+	 * @param flags0 file descriptor flags to set on read end of pipe.
+	 * @param flags1 file descriptor flags to set on write end of pipe.
+	 * @param status_flags0 descriptor status flags to set on read end of pipe.
+	 * @param status_flags1 descriptor status flags to set on write end of pipe.
+	 */
+	Pipe(int flags0 = 0, int flags1 = 0, int status_flags0 = 0,
+	     int status_flags1 = 0);
+
+	/**
+	  * Close the pair of file descriptors owned by the object.
+	  */
+	~Pipe();
+
+	/**
+	 * Make a copy of another Pipe object (file descriptors are dup'd).
+	 */
+	Pipe(const Pipe& other);
+
+	/**
+	 * Assign a Pipe object by closing file descriptors and duping those of
+	 * the other.
+	 */
+	Pipe& operator=(const Pipe& other);
+
+	/**
+	 * @return the file descriptor associated with the read-end of the pipe.
+	 */
+	int ReadFD() const
+		{ return fds[0]; }
+
+	/**
+	 * @return the file descriptor associated with the write-end of the pipe.
+	 */
+	int WriteFD() const
+		{ return fds[1]; }
+
+private:
+
+	int fds[2];
+	int flags[2];
+};
+
+} // namespace bro
+
+#endif // BRO_PIPE_H