default
:1 chiark.greenend.org.uk
 start 912888966.802483
 socket type=SOCK_DGRAM
 socket=4
 +0.000204
 fcntl fd=4 cmd=F_GETFL
 fcntl=~O_NONBLOCK&...
 +0.000670
 fcntl fd=4 cmd=F_SETFL O_NONBLOCK|...
 fcntl=OK
 +0.000072
 sendto fd=4 addr=172.18.45.6:53
     311f0100 00010000 00000000 06636869 61726b08 67726565 6e656e64 036f7267
     02756b00 00010001.
 sendto=40
 +0.000579
 select max=5 rfds=[4] wfds=[] efds=[] to=1.999421
 select=1 rfds=[4] wfds=[] efds=[]
 +0.006414
 recvfrom fd=4 buflen=512 *addrlen=16
 recvfrom=OK addr=172.18.45.6:53
     311f8580 00010001 00020002 06636869 61726b08 67726565 6e656e64 036f7267
     02756b00 00010001 c00c0001 00010001 51800004 c3e04c84 08677265 656e656e
     64036f72 6702756b 00000200 01000151 80001103 6e73300a 72656c61 74697669
     7479c038 c0380002 00010001 51800006 036e7331 c057c053 00010001 00015180
     0004ac12 2d06c070 00010001 00015180 0004ac12 2d41.
 +0.000874
 recvfrom fd=4 buflen=512 *addrlen=16
 recvfrom=EAGAIN
 +0.000179
 close fd=4
 close=OK
 +0.000184