Improve /proc/net/dev parsing to include all edge cases

[ablagoev]

On some old Linux kernels /proc/net/dev has the following format:

Inter-|   Receive                                                |  Transmit
 face |bytes    packets errs drop fifo frame compressed multicast|bytes    packets errs drop fifo colls carrier compressed
    lo:0 0    0    0    0     0          0         0   0   0    0    0    0     0       0          0
  eth0:0 0    0    0    0     0          0         0   0   0    0    0    0     0       0          0

This pull request (and commit respectively) broke the parsing of similar formats (where there is no space after ":"):

#317
654255b

I have improved the parsing a bit, so that all cases are handled properly, i.e:

eth1: bytes
eth1:bytes
eth1:0:bytes

Also created a test for all three cases.

[shirou]

Hmm, I don't know this type of format. Thank you!

Could you tell me which version of linux and distro has this format? It is a very useful information to other people.

[ablagoev]

Hey,

I've seen it on a couple of our machines. Oddly enough most of them are VMs. Alternatively, it might be a Centos quirk.

Distro	Kernel
Centos 5.6	Linux 2.6.18-238.12.1.el5 x86_64 GNU/Linux
Centos 5.7	Linux 2.6.18-274.3.1.el5 x86_64 GNU/Linux
Centos 6.0	Linux 2.6.32-71.29.1.el6.x86_64 GNU/Linux
Centos 6.3	Linux 2.6.32-279.19.1.el6.x86_64 GNU/Linux

[shirou]

Thank you so much. It will help someone later.