root@wirenboard-A462QQDT:~# ls -l /proc/[0-9]/fd/ 
/proc/1/fd/:
total 0
lrwx------ 1 root root 64 Jul 31 22:31 0 -> /dev/null
lrwx------ 1 root root 64 Jul 31 22:31 1 -> /dev/null
lr-x------ 1 root root 64 Jul 31 22:36 10 -> /proc/1/mountinfo
lrwx------ 1 root root 64 Aug  2 09:27 100 -> 'socket:[2371]'
lrwx------ 1 root root 64 Aug  2 09:27 101 -> 'socket:[5216]'
lrwx------ 1 root root 64 Aug  2 09:27 102 -> 'socket:[2367]'
lr-x------ 1 root root 64 Jul 31 22:36 11 -> anon_inode:inotify
lr-x------ 1 root root 64 Jul 31 22:31 12 -> anon_inode:inotify
lr-x------ 1 root root 64 Jul 31 22:36 13 -> anon_inode:inotify
lr-x------ 1 root root 64 Jul 31 22:36 14 -> /proc/swaps
lrwx------ 1 root root 64 Jul 31 22:36 15 -> 'socket:[956]'
lr-x------ 1 root root 64 Jul 31 22:36 16 -> anon_inode:inotify
lrwx------ 1 root root 64 Jul 31 22:36 17 -> anon_inode:bpf-prog
lrwx------ 1 root root 64 Jul 31 22:36 18 -> anon_inode:bpf-prog
lrwx------ 1 root root 64 Jul 31 22:36 19 -> 'socket:[960]'
lrwx------ 1 root root 64 Jul 31 22:31 2 -> /dev/null
lrwx------ 1 root root 64 Jul 31 22:31 20 -> 'socket:[962]'
lrwx------ 1 root root 64 Jul 31 22:36 21 -> 'socket:[963]'
lrwx------ 1 root root 64 Jul 31 22:36 22 -> anon_inode:bpf-prog
lrwx------ 1 root root 64 Jul 31 22:31 23 -> anon_inode:bpf-prog
lrwx------ 1 root root 64 Jul 31 22:36 24 -> anon_inode:bpf-prog
lrwx------ 1 root root 64 Jul 31 22:36 25 -> anon_inode:bpf-prog
lrwx------ 1 root root 64 Jul 31 22:36 26 -> anon_inode:bpf-prog
lrwx------ 1 root root 64 Jul 31 22:36 27 -> anon_inode:bpf-prog
lrwx------ 1 root root 64 Jul 31 22:36 28 -> 'anon_inode:[timerfd]'
lrwx------ 1 root root 64 Jul 31 22:36 29 -> anon_inode:bpf-prog
l-wx------ 1 root root 64 Jul 31 22:31 3 -> /dev/kmsg
lrwx------ 1 root root 64 Jul 31 22:31 30 -> anon_inode:bpf-prog
lrwx------ 1 root root 64 Jul 31 22:36 31 -> anon_inode:bpf-prog
lrwx------ 1 root root 64 Jul 31 22:36 32 -> 'socket:[6218236]'
lrwx------ 1 root root 64 Aug  2 09:27 37 -> 'socket:[957]'
lrwx------ 1 root root 64 Aug  1 00:00 38 -> 'socket:[958]'
lrwx------ 1 root root 64 Aug  2 09:27 39 -> 'socket:[959]'
lrwx------ 1 root root 64 Jul 31 22:31 4 -> 'anon_inode:[eventpoll]'
lrwx------ 1 root root 64 Jul 31 22:36 40 -> 'socket:[5091]'
lrwx------ 1 root root 64 Jul 31 22:36 41 -> 'socket:[5097]'
lr-x------ 1 root root 64 Jul 31 22:36 42 -> /dev/autofs
lrwx------ 1 root root 64 Aug  2 09:27 43 -> 'socket:[2363]'
lrwx------ 1 root root 64 Aug  2 09:27 44 -> 'socket:[971]'
lrwx------ 1 root root 64 Aug  2 09:27 45 -> 'socket:[967]'
lrwx------ 1 root root 64 Jul 31 22:31 46 -> 'socket:[2365]'
lrwx------ 1 root root 64 Aug  2 09:27 47 -> 'socket:[980]'
lrwx------ 1 root root 64 Aug  2 09:27 48 -> 'socket:[32625]'
lrwx------ 1 root root 64 Jul 31 22:36 49 -> 'anon_inode:[timerfd]'
lrwx------ 1 root root 64 Jul 31 22:31 5 -> 'anon_inode:[signalfd]'
lrwx------ 1 root root 64 Aug  2 09:27 50 -> 'socket:[29932]'
lrwx------ 1 root root 64 Aug  2 09:27 51 -> 'socket:[1331]'
lrwx------ 1 root root 64 Aug  2 09:27 52 -> 'socket:[1447]'
lrwx------ 1 root root 64 Jul 31 22:31 53 -> 'socket:[1448]'
lrwx------ 1 root root 64 Jul 31 22:31 54 -> 'socket:[6271]'
lrwx------ 1 root root 64 Jul 31 22:31 55 -> 'socket:[2416]'
lrwx------ 1 root root 64 Jul 31 22:31 56 -> 'socket:[2428]'
lrwx------ 1 root root 64 Jul 31 22:31 57 -> 'socket:[2387]'
lrwx------ 1 root root 64 Aug  2 09:27 58 -> 'socket:[2435]'
lrwx------ 1 root root 64 Aug  2 09:27 59 -> 'socket:[1493]'
lr-x------ 1 root root 64 Jul 31 22:36 6 -> anon_inode:inotify
lrwx------ 1 root root 64 Aug  2 09:27 60 -> 'socket:[5256]'
lrwx------ 1 root root 64 Aug  2 09:27 61 -> 'socket:[1593]'
lrwx------ 1 root root 64 Aug  2 09:27 62 -> 'socket:[5555]'
lrwx------ 1 root root 64 Aug  2 09:27 63 -> 'socket:[1876]'
lrwx------ 1 root root 64 Aug  2 09:27 64 -> 'socket:[1882]'
lrwx------ 1 root root 64 Aug  2 09:27 65 -> 'socket:[1891]'
lrwx------ 1 root root 64 Aug  2 09:27 66 -> 'socket:[2973]'
lrwx------ 1 root root 64 Jul 31 22:36 67 -> 'socket:[10508536]'
lrwx------ 1 root root 64 Aug  2 09:27 68 -> 'socket:[1956]'
lr-x------ 1 root root 64 Jul 31 22:36 7 -> /sys/fs/cgroup
lrwx------ 1 root root 64 Aug  2 09:27 70 -> 'socket:[7185]'
lrwx------ 1 root root 64 Aug  2 09:27 71 -> 'socket:[7186]'
lrwx------ 1 root root 64 Aug  2 09:27 74 -> 'socket:[7187]'
lrwx------ 1 root root 64 Aug  2 09:27 75 -> 'socket:[7190]'
lrwx------ 1 root root 64 Aug  2 09:27 76 -> 'socket:[7211]'
lrwx------ 1 root root 64 Aug  2 09:27 77 -> 'socket:[7221]'
lrwx------ 1 root root 64 Jul 31 22:31 78 -> 'socket:[7246]'
lrwx------ 1 root root 64 Aug  2 09:27 79 -> 'socket:[7255]'
lrwx------ 1 root root 64 Jul 31 22:36 8 -> 'anon_inode:[timerfd]'
lrwx------ 1 root root 64 Aug  2 09:27 82 -> 'socket:[7268]'
lrwx------ 1 root root 64 Aug  2 09:27 84 -> 'socket:[7269]'
lrwx------ 1 root root 64 Aug  2 09:27 85 -> 'socket:[8733]'
lrwx------ 1 root root 64 Aug  2 09:27 86 -> 'socket:[8839]'
lrwx------ 1 root root 64 Aug  2 09:27 87 -> 'socket:[6087]'
lrwx------ 1 root root 64 Aug  2 09:27 88 -> 'socket:[7971]'
lrwx------ 1 root root 64 Aug  2 09:27 89 -> 'socket:[10272]'
lrwx------ 1 root root 64 Jul 31 22:31 9 -> 'anon_inode:[eventpoll]'
lrwx------ 1 root root 64 Aug  2 09:27 90 -> 'socket:[10699]'
lrwx------ 1 root root 64 Aug  2 09:27 92 -> 'socket:[972]'
lr-x------ 1 root root 64 Aug  2 09:27 93 -> 'pipe:[6150]'
lrwx------ 1 root root 64 Aug  2 09:27 94 -> 'socket:[978]'
lrwx------ 1 root root 64 Aug  2 09:27 95 -> 'socket:[974]'
lrwx------ 1 root root 64 Jul 31 22:36 96 -> 'socket:[976]'
lrwx------ 1 root root 64 Aug  2 09:27 97 -> /dev/rfkill
lrwx------ 1 root root 64 Aug  2 09:27 98 -> 'socket:[2369]'
lrwx------ 1 root root 64 Aug  2 09:27 99 -> /run/initctl

/proc/2/fd/:
total 0

/proc/3/fd/:
total 0

/proc/4/fd/:
total 0

/proc/5/fd/:
total 0

/proc/6/fd/:
total 0

/proc/7/fd/:
total 0