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Full Discussion: Negative values for peer inodes in ss -x output
Top Forums UNIX for Advanced & Expert Users Negative values for peer inodes in ss -x output Post 303046271 by Skrynesaver on Wednesday 29th of April 2020 07:45:11 AM
Old 04-29-2020
Negative values for peer inodes in ss -x output
Hi all,

Long time no see, love what you've done with the place, been a while and asked this in the wrong forum initially...

I'm wondering how to interpret negative values for local and peer inode values for Unix sockets?

Code:
Netid  State      Recv-Q Send-Q Local Address:Port                 Peer Address:Port
...
u_str  ESTAB      0      0      /var/run/docker.sock -1847002447           * -1846996756

I can trace the local/peer relationship in the ss -xpan output for example...
grepping out known a negative inode id I get
Code:
# ss -xp | grep --  -1841560902
u_str  ESTAB      0      0      /var/run/docker.sock -1841556763           * -1841560902           users:(("dockerd",pid=29490,fd=276))
u_str  ESTAB      0      0      *                    -1841560902           * -1841556763           users:(("metricbeat",pid=5712,fd=94)

Then looking at the proc entry for the metricbeat process I get a non-negative inode for fd 94.
Code:
# ls -l /proc/5712/fd/
...
lrwx------ 1 root root 64 Apr 28 12:00 94 -> socket:[2453406394]

I'm curious as to the relationship (if any) between the "real" inode value and the negative value used for the inode in the ss output , what circumstances this value is used in (despite there being an inode for the symlink in /proc ) and general wisdom on the subject.

Thanks, Skrynesaver
 

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Negative values for peer inodes in ss -x output

Hi all, Long time no see, love what you've done with the place! I'm wondering how to interpret negative values for local and peer inode values for Unix sockets? Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port ... u_str ESTAB 0 0 ... (0 Replies)
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LEARN ABOUT DEBIAN

xfmtype

XFMTYPE(1)								XFM								XFMTYPE(1)

NAME

       xfmtype - xfm file type tester

SYNOPSIS

       xfmtype -m magic_file [-f] filename ...

DESCRIPTION

       The  xfmtype  program reads a magic configuration file and tests each file in its command line to tell its type according to the configura-
       tion file.

       The format of the configuration file is the similar to magic(5) with the differences described in 0

OPTIONS

       -f file
	   Consider the following argument as a file, even if it begins with `-'.

       -m file
	   Specifies a configuration file. You can specify more than one configuration file with several -m flags. They are read in the  order	in
	   which  they	are found. Configuration files do not have effect until they are encountered in the command line. So, files to test in the
	   command line before that switch will not be affected by it.

BUILT IN TYPES

       If no rule matches a specified field or the type cannot be determined because of other reasons, one of the  following  built  in  types	is
       returned:

       inode/x-unreadable The file could not be read.

       inode/x-empty File size is zero.

       text/plain The file looks like ACSII.
       xfm will look into xfm_mime.type(5) for more guessing.

       application/octet-stream Other regular file.
       xfm will look into xfm_mime.type(5) for more guessing.

       inode/directory A directory.

       inode/chardevice A character device.

       inode/blockdevice A block device.

       inode/pipe A names pipe (fifo).

       inode/socket A socket.

       inode/default None of the above.

BUGS

       Bad configuration lines cause undefined behavior. In general they are silently ignored, but that is not guaranteed.
       There are no warning or error message except for the regular expression syntax.
       There should be a syntax checking mode.
       All of the above apply to xfm too.

SEE ALSO

       xfm(1), xfm_magic(5), file(1), magic(5).

COPYRIGHT

       Copyright (c) 1995 CNM-US
       Copyright (c) 1995 Juan D. Martin

AUTHOR

       Juan D. Martin (juando@cnm.us.es)
       (but modified heavily by Bernhard R. Link)

xfm								  20 April, 2006							XFMTYPE(1)
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