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pgrep: Match on cgroup v2 paths

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You can match or filter on cgroup paths. Currently the match is only
done for version 2 cgroups because these are way simpler as they have
a unified name and always start with "0::".

cgroup v1 can have:
 named groups "1:name=myspecialname:"
 controllers "9:blkio:"
 multiple controllers! "4:cpu,cpuacct:"

So they are very much more complicated from a options parsing and
cgroup matching point of view.

In addition, both my Debian bookworm and bullseye systems use
v2 cgroups.

$ ./pgrep --cgroup /system.slice/cron.service
760

Signed-off-by: Craig Small <csmall@dropbear.xyz>
This commit is contained in:
Craig Small
2021-10-26 20:56:19 +11:00
parent 14d6ab27d6
commit 4cfb0fb763
3 changed files with 56 additions and 5 deletions
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@@ -9,6 +9,7 @@ procps-ng-NEXT
* pkill: Check for lt- variants of program name issue #192
* pgrep: Add newline after regex error message merge #91
* pgrep: Fix selection where uid/gid > 2^31 merge !146
* pgrep: Select on cgroup v2 paths issue #168
* ps: Add OOM and OOMADJ fields issue #198
* ps: Add IO Accounting fields issue #184
* ps: Add PSS and USS fields issue #112