Constant RESTART_IN_PLACE_EXIT_CODE 

pub const RESTART_IN_PLACE_EXIT_CODE: i32 = 75;

Available on crate feature process only.

The exit code of restart_in_place!.

This is EX_TEMPFAIL from sysexits.h. Shells, tini and Kubernetes report a process killed by signal N as exit code 128 + N, so a code below 128 can only come from an explicit exit.