直接按照书中的代码，编译的时候出现一堆问题，提示的错误都是文件找不到，其实在源代码包中的README文件中，详细的记录着编译的步骤
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我的编译环境：Ubuntu 14.04.2 LTS 64bit
Execute the following from the src/ directory: ./configure # try to figure out all implementation differences cd lib # build the basic library that all programs need make # use "gmake" everywhere on BSD/OS systems cd ../libfree # continue building the basic library make cd ../libroute # only if your system supports 4.4BSD style routing sockets make # only if your system supports 4.4BSD style routing sockets cd ../libxti # only if your system supports XTI make # only if your system supports XTI cd ../intro # build and test a basic client program make daytimetcpcli ./daytimetcpcli 127.0.0.1
按照操作一路搞下来，最后运行:wu@ubuntu:~/opt/unpv13e/intro$ ./daytimetcpcli 127.0.0.1
得到错误提示：connect error: Connection refused
原因：系统默认没打开daytime服务。
解决办法：
在intro中执行一下命令打开daytime服务
wu@ubuntu:~/opt/unpv13e/intro$ make daytimetcpsrv
gcc -I../lib -g -O2 -D_REENTRANT -Wall -c -o daytimetcpsrv.o daytimetcpsrv.c
gcc -I../lib -g -O2 -D_REENTRANT -Wall -o daytimetcpsrv daytimetcpsrv.o ../libunp.a -lpthread
wu@ubuntu:~/opt/unpv13e/intro$ sudo ./daytimetcpsrv
开启服务后，打开另一个终端
wu@ubuntu:~/opt/unpv13e/intro$ ./daytimetcpcli 127.0.0.1
Thu Aug 4 04:16:52 2016
搞定
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