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    <p>First of all, as for Gingerbread (and Linux kernel 2.6.35) <code>/sys/class/net</code> is not a regular file, it's a directory with a bunch of links to directories to real devices' statistics. It's perfectly readable with any permissions. Use Android terminal emulator (AppMenu -> DevTools -> Terminal Emulator) to see how it looks like. What it looks like. All files below <code>/sys</code> belong to a special kernel subsystem, they're not real files, just interfaces for reading information from kernel. Monitoring means just reading dedicated files that contains counts of transmitted/received/dropped bytes/packets/etc. E.g. In the terminal emulator:</p> <pre><code># ls -l /sys/class/net lrwxrwxrwx root root 2012-03-15 16:49 lo -&gt; ../../devices/virtual/net/lo lrwxrwxrwx root root 2012-03-15 16:49 eth0 -&gt; ../../devices/platform/smc91x.0/net/eth0 lrwxrwxrwx root root 2012-03-15 16:49 tunl0 -&gt; ../../devices/virtual/net/tunl0 lrwxrwxrwx root root 2012-03-15 16:49 gre0 -&gt; ../../devices/virtual/net/gre0 # ls -l /sys/devices/platform/smc91x.0/net/eth0 ### ... A lot of files drwxr-xr-x root root 2012-03-15 16:47 statistics ### ... # ls -l /sys/devices/platform/smc91x.0/net/eth0/statistics -r--r--r-- root root 4096 2012-03-15 17:03 rx_packets -r--r--r-- root root 4096 2012-03-15 17:03 tx_packets -r--r--r-- root root 4096 2012-03-15 17:03 rx_bytes -r--r--r-- root root 4096 2012-03-15 17:03 tx_bytes -r--r--r-- root root 4096 2012-03-15 17:03 rx_errors -r--r--r-- root root 4096 2012-03-15 17:03 tx_errors -r--r--r-- root root 4096 2012-03-15 17:03 rx_dropped -r--r--r-- root root 4096 2012-03-15 17:03 tx_dropped -r--r--r-- root root 4096 2012-03-15 17:03 multicast -r--r--r-- root root 4096 2012-03-15 17:03 collisions -r--r--r-- root root 4096 2012-03-15 17:03 rx_length_errors -r--r--r-- root root 4096 2012-03-15 17:03 rx_over_errors -r--r--r-- root root 4096 2012-03-15 17:03 rx_crc_errors -r--r--r-- root root 4096 2012-03-15 17:03 rx_frame_errors -r--r--r-- root root 4096 2012-03-15 17:03 rx_fifo_errors -r--r--r-- root root 4096 2012-03-15 17:03 rx_missed_errors -r--r--r-- root root 4096 2012-03-15 17:03 tx_aborted_errors -r--r--r-- root root 4096 2012-03-15 17:03 tx_carrier_errors -r--r--r-- root root 4096 2012-03-15 17:03 tx_fifo_errors -r--r--r-- root root 4096 2012-03-15 17:03 tx_heartbeat_errors -r--r--r-- root root 4096 2012-03-15 17:03 tx_window_errors -r--r--r-- root root 4096 2012-03-15 17:03 rx_compressed -r--r--r-- root root 4096 2012-03-15 17:03 tx_compressed # cat /sys/devices/platform/smc91x.0/net/eth0/statistics/rx_bytes 410236 </code></pre>
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    1. USDmytro Sirenko
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