编译unix环境高级编程第一个例子出错解决

unix环境高级编程第一个例子ls.c:

01	#include "apue.h"

02	#include <dirent.h>

03

04

int

05	main(int argc,char *argv[])

06

{

07	DIR     *dp;

08	struct dirent   *dirp;

09

10	if(argc != 2)

11	err_quit("usage: ls directory_name");

12

13	if((dp = opendir(argv[1])) == NULL)

14	err_sys("can't open %s", argv[1]);

15	while((dirp = readdir(dp))!=NULL)

16	printf("%s\n",dirp->d_name);

17	closedir(dp);

18

exit(0);

19

}

编译出错：

[john@localhost apue]$ gcc ls.c

/tmp/cchIn3xL.o: In function `main':
ls.c:(.text+0x17): undefined reference to `err_quit'
ls.c:(.text+0x4a): undefined reference to `err_sys'

发现是找不到err_quit和err_sys，于是把unix环境高级编程源码的lib目录下的error.c拷贝出来和一起编译:

[john@localhost apue]$ gcc ls.c error.c
OK，解决了。