How do I tie values in the 'inode' column of /proc/net/tcp
to files in /proc/<pid>/fd/
?
I was under the impression that the inode
column in the TCP had a decimal representation of the socket's inode, but that doesn't seem to be the case.
For example, if I run telnet localhost 80
, I see the following (telnet is pid 9021).
/proc/net/tcp
contains
sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode
23: 0100007F:CE2A 0100007F:0050 01 00000000:00000000 00:00000000 00000000 1000 0 361556 1 00000000 20 0 0 10 -1
which makes me think that the inode of the socket connected to 127.0.0.1:80 is 361556. But if I run ls --inode -alh /proc/9021/fd
, I see
349886 lrwx------ 1 me me 64 Dec 26 10:51 3 -> socket:[361556]
The inode is 349886, which is different from the value in the inode column of the tcp table: 361556. But the link target seems to have the right name. Similarly, stat /proc/9021/3
shows:
File: ‘/proc/9021/fd/3’ -> ‘socket:[361556]’
Size: 64 Blocks: 0 IO Block: 1024 symbolic link
Device: 3h/3d Inode: 349886 Links: 1
What's the number in the inode column of tcp table? Why doesn't it line up with the inode as reported by ls
or stat
?
(I'm running Ubuntu 14.10, if that matters)
The inode shown by ls
and stat
is for the symlink that points to the inode associated with the socket. Running ls -iLalh
shows the right inode. Ditto for stat -L
.
Herpa derp derp. I only figured this out when I was composing my question. ;_;