From 83996dda13797c0fe9e83384ec9c36add8b5d85d Mon Sep 17 00:00:00 2001
From: Matthew Kent <mkent@magoazul.com>
Date: Sun, 9 Aug 2009 15:20:25 -0700
Subject: [PATCH] Add per interface support for tx_queue_len, Linux only.
 Update the ifconfig example output.

---
 bindings/SigarWrapper.pm           |  5 +++++
 bindings/ruby/examples/ifconfig.rb |  3 ++-
 include/sigar.h                    |  1 +
 src/sigar.c                        | 13 ++++++++++++-
 4 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/bindings/SigarWrapper.pm b/bindings/SigarWrapper.pm
index 5801f70e..56793a16 100644
--- a/bindings/SigarWrapper.pm
+++ b/bindings/SigarWrapper.pm
@@ -1081,6 +1081,11 @@ use vars qw(%classes %cmds);
          desc => '',
          plat => 'DFL'
       },
+      {
+         name => 'tx_queue_len', type => 'Int',
+         desc => '',
+         plat => 'L'
+      },
     ],
     NetInterfaceStat => [
       {
diff --git a/bindings/ruby/examples/ifconfig.rb b/bindings/ruby/examples/ifconfig.rb
index 4443e7ef..d0cf21cd 100644
--- a/bindings/ruby/examples/ifconfig.rb
+++ b/bindings/ruby/examples/ifconfig.rb
@@ -65,7 +65,8 @@ iflist.each do |ifname|
         " overruns:" + ifstat.tx_overruns.to_s +
         " carrier:" + ifstat.tx_carrier.to_s
 
-    puts "\t" + "collisions:" + ifstat.tx_collisions.to_s
+    puts "\t" + "collisions:" + ifstat.tx_collisions.to_s +
+      " txqueuelen:" + ifconfig.tx_queue_len.to_s
 
     rx_bytes = ifstat.rx_bytes
     tx_bytes = ifstat.tx_bytes
diff --git a/include/sigar.h b/include/sigar.h
index a09ecebd..0ca85fa5 100644
--- a/include/sigar.h
+++ b/include/sigar.h
@@ -613,6 +613,7 @@ typedef struct {
         flags,
         mtu,
         metric;
+    int tx_queue_len;
 } sigar_net_interface_config_t;
 
 SIGAR_DECLARE(int)
diff --git a/src/sigar.c b/src/sigar.c
index 9ab00450..e0d7623f 100644
--- a/src/sigar.c
+++ b/src/sigar.c
@@ -1640,7 +1640,18 @@ int sigar_net_interface_config_get(sigar_t *sigar, const char *name,
         ifconfig->metric = ifr.ifr_metric ? ifr.ifr_metric : 1;
     }
 
-    close(sock);    
+#if defined(SIOCGIFTXQLEN)
+    if (!ioctl(sock, SIOCGIFTXQLEN, &ifr)) {
+        ifconfig->tx_queue_len = ifr.ifr_qlen;
+    } 
+    else {
+        ifconfig->tx_queue_len = -1; /* net-tools behaviour */
+    }
+#else
+    ifconfig->tx_queue_len = -1;
+#endif
+
+    close(sock);
 
     /* XXX can we get a better description like win32? */
     SIGAR_SSTRCPY(ifconfig->description,