root@app1:~# strace -f -p 18956
Process 18956 attached
read(6, ^CProcess 18956 detached
 <detached ...>
root@app1:~#
root@app1:~#
root@app1:~# ls -l /proc/18956/fd/
total 0
lr-x------ 1 www-data www-data 64 Feb  9 13:39 0 -> pipe:[2186249740]
lrwx------ 1 www-data www-data 64 Feb  9 13:39 1 ->  (deleted)/tmp/tmpfPvI8Ub
lrwx------ 1 www-data www-data 64 Feb  9 13:39 2 ->  (deleted)/tmp/tmpfPvI8Ub
lrwx------ 1 www-data www-data 64 Feb  9 13:39 3 -> socket:[2186249854]
lrwx------ 1 www-data www-data 64 Feb  9 13:39 4 -> socket:[2186249884]
lrwx------ 1 www-data www-data 64 Feb  9 13:39 5 -> socket:[2186249899]
lrwx------ 1 www-data www-data 64 Feb  9 13:39 6 -> socket:[2186254615]
l-wx------ 1 www-data www-data 64 Feb  9 13:39 99 -> /tmp/flock-6fac0706e837b389dd6ec6b38b6982c9
root@app1:~#
root@app1:~# head -n1 < /proc/net/tcp ; grep -a 2186254615 /proc/net/tcp
  sl  local_address rem_address   st tx_queue rx_queue tr tm->when retrnsmt   uid  timeout inode
 432: 63993125:C070 25520CB9:01BB 01 00000000:00000000 00:00000000 00000000    33        0 2186254615 1 ffff88040e68b140 39 3 14 10 -1
root@app1:~#

irb(main):001:0> '25520CB9'.scan(/../).reverse.map{|x|x.to_i(16)}.join('.')
=> "185.12.82.37"
irb(main):002:0> 0x01BB
=> 443
irb(main):003:0>

=> TCP-Socket, remote 185.12.82.37:443