查看readme文件：
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
 

yuanoung@ThinkPad-X260:~/Projects/unixNetwork/lib$ cd ../libfree
yuanoung@ThinkPad-X260:~/Projects/unixNetwork/libfree$ make
gcc -I../lib -g -O2 -D_REENTRANT -Wall   -c -o in_cksum.o in_cksum.c
gcc -I../lib -g -O2 -D_REENTRANT -Wall   -c -o inet_ntop.o inet_ntop.c
inet_ntop.c: In function ‘inet_ntop’:
inet_ntop.c:60:9: error: argument ‘size’ doesn’t match prototype
  size_t size;
         ^~~~
In file included from inet_ntop.c:27:0:
/usr/include/arpa/inet.h:64:20: error: prototype declaration
 extern const char *inet_ntop (int __af, const void *__restrict __cp,
                    ^~~~~~~~~
<builtin>: recipe for target ‘inet_ntop.o‘ failed
make: *** [inet_ntop.o] Error 1
yuanoung@ThinkPad-X260:~/Projects/unixNetwork/libfree$ vim inet_ntop.c 
--〉將第60行的 size_t size 改成 socklen_t size;  再次make，有警告，但是可以忽略。
 

將文件拷貝到指定的目錄：

yuanoung@ThinkPad-X260:~/Projects/unixNetwork$ sudo cp libunp.a /usr/lib
yuanoung@ThinkPad-X260:~/Projects/unixNetwork$ sudo cp lib/unp.h /usr/include
yuanoung@ThinkPad-X260:~/Projects/unixNetwork$ sudo cp config.h /usr/include
yuanoung@ThinkPad-X260:~/Projects/unixNetwork$ vim lib/unp.h   # 將#include "../config.h" 改成 #include "config.h"
 

對代碼進行編譯：

yuanoung@ThinkPad-X260:~/Projects/unixNetwork/intro$ gcc daytimetcpcli.c -o cli -lunp
yuanoung@ThinkPad-X260:~/Projects/unixNetwork/intro$ gcc daytimetcpsrv.c -o srv -lunp

運行第一個例子：

yuanoung@ThinkPad-X260:~/Projects/unixNetwork/intro$ sudo ./srv


yuanoung@ThinkPad-X260:~/Projects/unixNetwork/intro$ ./cli 127.0.0.1
Fri Feb  9 20:09:46 2018
yuanoung@ThinkPad-X260:~/Projects/unixNetwork/intro$ ./cli 127.0.0.1
Fri Feb  9 20:09:47 2018

unix網絡編程 代碼編譯