Matej Kosik: > > I am trying to figure out the meaning of: > > /proc/$PID/fd/* > > files.
These files represent the open files of a process. On recent systems you
can even see the associated "real" files, if any:
# ls -l /proc/6373/fd
total 0
lr-x------ 1 root root 64 Feb 19 10:25 0 -> /dev/null
l-wx------ 1 root root 64 Feb 19 10:25 1 -> /dev/null
l-wx------ 1 root root 64 Feb 19 10:25 2 -> /var/log/apache2/error.log
lrwx------ 1 root root 64 Feb 19 10:25 3 -> socket:[8270]
lrwx------ 1 root root 64 Feb 19 10:25 4 -> socket:[201752]
lr-x------ 1 root root 64 Feb 19 10:25 5 -> pipe:[200346]
l-wx------ 1 root root 64 Feb 19 10:25 6 -> pipe:[200346]
l-wx------ 1 root root 64 Feb 19 10:25 7 ->
/var/log/apache2/other_vhosts_access.log
l-wx------ 1 root root 64 Feb 19 10:25 8 -> /var/log/apache2/access.log
This is shown using kernel 3.2 from wheezy.
File descriptor 0 should usually be stdin. Your example probably did not
work as expected because stdin of your program was some kind of terminal
(dev/pts/<n> or /dev/tty<n>).
J.
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