[root@onong 5227]# strace -s 1024 -p 5227
Process 5227 attached - interrupt to quit
read(28,

The fd in question is a pipe:

[root@onong tmp]# ls -l /proc/5227/fd
total 0
lr-x------ 1 root root 64 Feb 21 02:02 0 -> /dev/null
l-wx------ 1 root root 64 Feb 21 02:02 1 -> /tmp/abc.log
.
.
lr-x------ 1 root root 64 Feb 21 02:02 28 -> pipe:[28443]


Following are the processes which have a reference to this pipe:

[root@onong tmp]# lsof | grep 28443
perl       5049      root   28r     FIFO                0,6                 28443 pipe
ntpd       9936       ntp   28r     FIFO                0,6                 28443 pipe
ntpd       9936       ntp   29w     FIFO                0,6                 28443 pipe
dhcpd     10228      root   28r     FIFO                0,6                 28443 pipe
java      15518      root   28r     FIFO                0,6                 28443 pipe