// i3-bw
// This software is licensed under the GPL.
// Author: lee@yun.yagibdah.de, 2012-09-28
//
// This program outputs some system information to be displayed in the
// status bar of the i3 window manager.  I wrote it because I wanted
// the up- and downstream bandwidth usage displayed in the bar and the
// i3-status program only displays the link speed.
//
// compile with something like:
//   gcc -march=native -Wall -O2 i3-bw.c -o i3-bw
//
// First run the program from the commandline to check if you get any
// errors:
//
// ./i3-bw 1 /sys/class/net/eth1/statistics/rx_bytes /sys/class/net/eth1/statistics/tx_bytes
//
// Replace "eth1" with the inferface you want the bandwidth usage displayed
// for. It it works, make an entry in your i3 configuration like:
//
// bar {
//   status_command path/to/i3-bw 5 /sys/class/net/eth1/statistics/rx_bytes /sys/class/net/eth1/statistics/tx_bytes
// }
//
// That updates the info in the bar every 5 seconds, giving you the average
// bandwidth usage over the last 5 seconds.
//