Support overriding net device name

The default net device was `wlan0`, and it was not previously
overrideable. Now it can be overridden by the `CMON_NETDEV` environment
variable.

1 files changed, 5 insertions, 2 deletions

diff --git a/src/main.c b/src/main.c
index cf31530..42d2b5e 100644
--- a/src/main.c
+++ b/src/main.c
@@ -52,8 +52,11 @@ int main(int argc, char* argv[]) {
   status.nprocs = get_nprocs();
 
   // Store number of processors to make load values more useful
-  status.nettx = net_x_bytes("wlan0", 't');
-  status.netrx = net_x_bytes("wlan0", 'r');
+  char* netdev = "wlan0";
+  if(getenv("CMON_NETDEV") != NULL)
+    netdev = getenv("CMON_NETDEV");
+  status.nettx = net_x_bytes(netdev, 't');
+  status.netrx = net_x_bytes(netdev, 'r');
 
   // Store uptime
   status.uptime = proc_uptime();