https://support.microsoft.com/en-us/getsupport?oaspworkflow=start_1.0.0.0&wfname=capsub&productkey=edfsmsbl3&ccsid=635660384219463241

[root@mail proc]# ls -l /proc/2616/cwd
lrwxrwxrwx 1 named named 0 5月 1 11:53 /proc/2616/cwd -> /var/named/chroot/var/named

cwdのリンク先を調べればOK。