"backend process" confused with "server process"

hi.

pg_log_backend_memory_contexts
we have
`
if (proc == NULL)
{
/*
* This is just a warning so a loop-through-resultset will not abort
* if one backend terminated on its own during the run.
*/
ereport(WARNING,
(errmsg("PID %d is not a PostgreSQL server process", pid)));
PG_RETURN_BOOL(false);
}
`

pg_signal_backend
`
if (proc == NULL)
{
/*
* This is just a warning so a loop-through-resultset will not abort
* if one backend terminated on its own during the run.
*/
ereport(WARNING,
(errmsg("PID %d is not a PostgreSQL backend process", pid)));

return SIGNAL_BACKEND_ERROR;
}
`

"is not a PostgreSQL server process" is the same thing as "not a
PostgreSQL backend process"?
should we unify it?