+int get_mtime(const char *file_name, struct timespec *mtime);
+
+void xpipe(int fds[2]);
+
+char *describe_fd(int fd);
+
+/* Default value of dscp bits for connection between controller and manager.
+ * Value of IPTOS_PREC_INTERNETCONTROL = 0xc0 which is defined
+ * in <netinet/ip.h> is used. */
+#define DSCP_DEFAULT IPTOS_PREC_INTERNETCONTROL
+
+/* Invalid dscp value. If the dscp value will not be used, the dscp value
+ * passed must be invalid. Set to 0xFF as the TOS bits passed can only be
+ * 6 bits. */
+#define DSCP_INVALID 0xFF