bash-3.1# lsof COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME init 1 root cwd DIR 3,2 4096 2 / init 1 root rtd DIR 3,2 4096 2 / init 1 root txt REG 3,2 31328 1422661 /sbin/init init 1 root mem REG 0,0 0 [heap] (stat: No such file or directory) init 1 root mem REG 3,2 1195448 1279511 /lib/libc-2.3.6.so init 1 root mem REG 3,2 107630 1279504 /lib/ld-2.3.6.so init 1 root 10u FIFO 0,12 1567 /dev/initctl [heap] (stat: No such file or directory) --- what is it?