tools, lib: cbr tool for bandwidth testing

The tool sends constant bandwidth traffic between a client and a
server. cbr --help for more info.

Adds time_utils.h to the library containing useful functions for
arithmetic with timespec and timeval structures.

2 files changed, 76 insertions, 0 deletions

diff --git a/include/ouroboros/CMakeLists.txt b/include/ouroboros/CMakeLists.txt
index 6e49ee04..245187e9 100644
--- a/include/ouroboros/CMakeLists.txt
+++ b/include/ouroboros/CMakeLists.txt
@@ -11,6 +11,7 @@ set(HEADER_FILES
         instance_name.h
         irm.h
         qos.h
+        time_utils.h
 )
 
 install(FILES ${HEADER_FILES} DESTINATION include/ouroboros)
diff --git a/include/ouroboros/time_utils.h b/include/ouroboros/time_utils.h
new file mode 100644
index 00000000..d7274c1d
--- /dev/null
+++ b/include/ouroboros/time_utils.h
@@ -0,0 +1,75 @@
+/*
+ * Ouroboros - Copyright (C) 2016
+ *
+ * Time utilities
+ *
+ *    Dimitri Staessens <dimitri.staessens@intec.ugent.be>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef OUROBOROS_TIME_UTILS_H
+#define OUROBOROS_TIME_UTILS_H
+
+#ifndef MILLION
+#define MILLION  1000000L
+#endif
+
+#ifndef BILLION
+#define BILLION  1000000000L
+#endif
+
+#include <sys/time.h>
+#include <limits.h> /* LONG_MAX */
+
+/* functions for timespecs */
+#define ts_diff_ns(t0, tx) (((tx)->tv_sec - (t0)->tv_sec) * BILLION     \
+                            + ((tx)->tv_nsec - (t0)->tv_nsec))
+#define ts_diff_us(t0, tx) (((tx)->tv_sec - (t0)->tv_sec) * MILLION     \
+                            + ((tx)->tv_nsec - (t0)->tv_nsec) / 1000L)
+#define ts_diff_ms(t0, tx) (((tx)->tv_sec - (t0)->tv_sec) * 1000L       \
+                            + ((tx)->tv_nsec - (t0)->tv_nsec) / MILLION)
+
+/* functions for timevals are the same */
+#define tv_diff_us(t0, tx) ts_diff_us(t0, tx)
+#define tv_diff_ms(t0, tx) ts_diff_ms(t0, tx)
+
+/* functions for timespecs */
+int ts_add(const struct timespec * t,
+           const struct timespec * intv,
+           struct timespec *       res);
+
+int ts_diff(const struct timespec * t,
+            const struct timespec * intv,
+            struct timespec *       res);
+
+/* functions for timevals */
+int tv_add(const struct timeval * t,
+           const struct timeval * intv,
+           struct timeval *       res);
+
+int tv_diff(const struct timeval * t,
+            const struct timeval * intv,
+            struct timeval *       res);
+
+/* copying a timeval into a timespec */
+int tv_to_ts(const struct timeval * src,
+             struct timespec *      dst);
+
+/* copying a timespec into a timeval (loss of resolution) */
+int ts_to_tv(const struct timespec * src,
+             struct timeval *        dst);
+
+#endif /* OUROBOROS_TIME_UTILS_H */