Question: Why Are File Descriptors Not Closed and Accounted for PostgreSQL Backends?

Hi PostgreSQL Community, 
when a backend process starts, pq_init is called where it opens a FD during CreateWaitEventSet()


if (!AcquireExternalFD())
{
/* treat this as though epoll_create1 itself returned EMFILE */
elog(ERROR, "epoll_create1 failed: %m");
}
set->epoll_fd = epoll_create1(EPOLL_CLOEXEC);


but we didn't closed or called ReleaseExternalFD() for accounting,lets say if we have multiple clients connected and are actively running queries, won't the max number of open FDs (ulimit -n) limit of the system gets reached and cause "Too many open files issue"?

Regards
Srinath Reddy