ll /proc/18331/fd/total 0dr-x------ 2 root root 0 2012-02-27 08:44 ./dr-xr-xr-x 5 www-data www-data 0 2012-02-27 08:37 ../lr-x------ 1 root root 64 2012-02-27 08:44 0 -> /dev/nulll-wx------ 1 root root 64 2012-02-27 08:44 1 -> /dev/nulllr-x------ 1 root root 64 2012-02-27 08:44 10 -> eventpoll:[1086714480]lrwx------ 1 root root 64 2012-02-27 08:44 11 -> socket:[1086769711]lrwx------ 1 root root 64 2012-02-27 08:44 12 -> socket:[1086769821]lrwx------ 1 root root 64 2012-02-27 08:44 13 -> socket:[1086769871]l-wx------ 1 root root 64 2012-02-27 08:44 2 -> /var/log/apache2/error.loglrwx------ 1 root root 64 2012-02-27 08:44 3 -> socket:[966856457]lr-x------ 1 root root 64 2012-02-27 08:44 4 -> pipe:[1075755708]l-wx------ 1 root root 64 2012-02-27 08:44 5 -> pipe:[1075755708]l-wx------ 1 root root 64 2012-02-27 08:44 6 -> /var/log/apache2/range-CVE-2011-3192.logl-wx------ 1 root root 64 2012-02-27 08:44 7 -> /var/log/apache2/other_vhosts_access.logl-wx------ 1 root root 64 2012-02-27 08:44 8 -> /var/log/apache2/access.loglrwx------ 1 root root 64 2012-02-27 08:44 9 -> (deleted) /tmp/.xcache.0.0.1686689511.lock
socket:[966856457]
pipe:[1075755708]
або подивитися код lsof, якщо дуже цікаво як воно працює.