学习unp网络编程，树上的例子均存在#include "unp.h"，故需要对环境进行配置。
1. 到资源页下载unpv13e
2. 解压并将unpv13e 移动到相应的文件夹下
3. 编译
1 >$ cd unpv13e 2 >~unpv13e/$ ./configure 3 4 >~unpv13e/$ cd lib 5 >~unpv13e/lib/$ make 6 7 >~unpv13e/lib/$ cd ../libfree 8 >~unpv13e/libfree/$ make
如若出现以下问题:
1 gcc -I../lib -g -O2 -D_REENTRANT -Wall -c -o inet_ntop.o inet_ntop.c 2 inet_ntop.c: In function ‘inet_ntop’: 3 inet_ntop.c:60:9: error: argument ‘size’ doesn’t match prototype 4 size_t size; 5 ^ 6 In file included from inet_ntop.c:27:0: 7 /usr/include/arpa/inet.h:64:20: error: prototype declaration 8 extern const char *inet_ntop (int __af, const void *__restrict __cp, 9 ^ 10 make: *** [inet_ntop.o] Error 1
则需要:
1 >~unpv13e/libfree/$ vim inet_ntop.c //将第60行的 size_t size 改成 socklen_t size; 2 >~unpv13e/libfree/$ make // 改变完后重新make 3 >~unpv13e/libfree/$ cd ../libgai 4 >~unpv13e/libgai/$ make //以下只是warning, 乎略之 5 /usr/include/arpa/inet.h: In function ‘inet_ntop’: 6 inet_ntop.c:152:23: warning: ‘best.len’ may be used uninitialized in this function [-Wmaybe-uninitialized] 7 if (best.base == -1 || cur.len > best.len) 8 ^ 9 inet_ntop.c:123:28: note: ‘best.len’ was declared here 10 struct { int base, len; } best, cur; 11 ^ 12 gcc -I../lib -g -O2 -D_REENTRANT -Wall -c -o inet_pton.o inet_pton.c 13 ar rv ../libunp.a in_cksum.o inet_ntop.o inet_pton.o 14 a - in_cksum.o 15 a - inet_ntop.o 16 a - inet_pton.o 17 ranlib ../libunp.a
至此，编译成功生成静态库libunp.a
4. 将生成的libunp.a复制到/usr/lib下
1 >~unpv13e/libgai/$ cd .. 2 >~unpv13e/$ sudo cp libunp.a /usr/lib
5. 修改unpv13e/lib/unp.h并复制
1 >~unpv13e/$ vim lib/unp.h // 将#include "../config.h" 改成 #include "config.h" 2 >~unpv13e/$ sudo cp lib/unp.h /usr/include 3 >~unpv13e/$ sudo cp config.h /usr/include
6. 编译例子
1 >~unpv13e/$ cd intro 2 >~unpv13e/$ gcc daytimetcpcli.c -o cli -lunp
编译成功则大功告成。