# ps -fp 308
     UID   PID  PPID   C    STIME TTY         TIME CMD
    root   308   255   0 22:44:07 ?           0:00 /usr/lib/ssh/sshd
# pfiles 308 | egrep 'S_IFSOCK|sockname: '
   6: S_IFSOCK mode:0666 dev:326,0 ino:3255 uid:0 gid:0 size:0
        sockname: AF_INET 192.168.1.30  port: 22

# pgrep sshd
3155
# ls -l /proc/3155/fd | fgrep socket
lrwx------ 1 root root 64 May 22 23:04 3 -> socket:[7529]
# fgrep 7529 /proc/3155/net/tcp
   6: 00000000:0016 00000000:0000 0A 00000000:00000000 00:00000000 00000000     0        0 7529 1 f5baa8a0 300 0 0 2 -1

tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN

netstat -ltn

lsof -b -n -i4tcp:80

strace -f netstat -na