From cf59099b49474589075787fe79d12f71a4ca0e9e Mon Sep 17 00:00:00 2001
From: "Bruce A. Mah" <bmah@es.net>
Date: Wed, 15 Jan 2014 10:27:33 -0800
Subject: [PATCH] Add support for a -d debug flag to enable debugging output.

Mostly intended for developer use.  At the moment there are no public
uses for this flag.
---
 src/iperf.h     | 3 ++-
 src/iperf_api.c | 6 +++++-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/iperf.h b/src/iperf.h
index 41170ec..f391ea8 100644
--- a/src/iperf.h
+++ b/src/iperf.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2009-2013, The Regents of the University of California,
+ * Copyright (c) 2009-2014, The Regents of the University of California,
  * through Lawrence Berkeley National Laboratory (subject to receipt of any
  * required approvals from the U.S. Dept. of Energy).  All rights reserved.
  *
@@ -184,6 +184,7 @@ struct iperf_test
     int	      verbose;                          /* -V option - verbose mode */
     int	      json_output;                      /* -J option - JSON output */
     int	      zerocopy;                         /* -Z option - use sendfile */
+    int       debug;				/* -d option - enable debug */
 
     int	      multisend;
     int	      may_use_sigalrm;
diff --git a/src/iperf_api.c b/src/iperf_api.c
index f288011..202cf2f 100644
--- a/src/iperf_api.c
+++ b/src/iperf_api.c
@@ -543,6 +543,7 @@ iperf_parse_arguments(struct iperf_test *test, int argc, char **argv)
 #if defined(linux)
         {"linux-congestion", required_argument, NULL, 'C'},
 #endif
+        {"debug", no_argument, NULL, 'd'},
         {"help", no_argument, NULL, 'h'},
         {NULL, 0, NULL, 0}
     };
@@ -554,7 +555,7 @@ iperf_parse_arguments(struct iperf_test *test, int argc, char **argv)
 
     blksize = 0;
     server_flag = client_flag = rate_flag = duration_flag = 0;
-    while ((flag = getopt_long(argc, argv, "p:f:i:DVJvsc:ub:t:n:k:l:P:Rw:B:M:N46S:L:ZO:F:A:T:C:h", longopts, NULL)) != -1) {
+    while ((flag = getopt_long(argc, argv, "p:f:i:DVJvsc:ub:t:n:k:l:P:Rw:B:M:N46S:L:ZO:F:A:T:C:dh", longopts, NULL)) != -1) {
         switch (flag) {
             case 'p':
                 test->server_port = atoi(optarg);
@@ -754,6 +755,9 @@ iperf_parse_arguments(struct iperf_test *test, int argc, char **argv)
 		return -1;
 #endif /* linux */
 		break;
+	    case 'd':
+		test->debug = 1;
+		break;
             case 'h':
             default:
                 usage_long();