script.3

unix网络编程第一卷socket编程书上的全部源代码

kohala % ./udpcli01 gemini.tuc.noao.edu  echo
hello, world
ICMP error: dest = 140.252.1.11.7, type = 3, code = 3
kohala % 
kohala % ./udpcli 198.82.204.99 echo
ksh: ./udpcli:  not found
kohala % ./udpcli01 198.82.204.99 echo
hello, world
ICMP error: dest = 198.82.204.99.7, type = 3, code = 3
kohala % ./udpcli01 192.3.4.5.82.204.99 echo
udp_client error for 192.3.4.5.82.204.99, echo: host nor service provided, or not known
kohala % ./udpcli01 192.3.4.5 echo          
hello
ICMP error: dest = 192.3.4.5.7, type = 3, code = 1