what does it mean to have exit-code of 251

[prashantkumar dhotre]

Hi,

In my journal log, I see ;

1199473 Mar 01 15:46:03 evo-qfx-01 systemd[1]: ifmand.service: Main process
exited, code=exited, status=251/n/a

In my app, I don't explicitly call exit(251).
I use zookeeper lib.
Fro my logs,I see that after a call to zookeeper lib API zookeeper_close()
, I see that my service exited with 251.
Is 251 a std exit code or app/lib specific custom exit code ?
I want to know what does 251 means.

Can you  please  let me know where can I see the exit-code to meaning mapping
?

Thanks

Prashant