apue学习记录——配置apue.3e，实现P4‘ls例子

 1 #include"apue.h"
 2 #include<dirent.h>
 3 
 4 int main(int argc,char *argv[])
 5 {
 6     DIR            *dp;
 7     struct dirent        *dirp;
 8 
 9     if(argc != 2)
10         err_quit("usage:ls directroy_name:");
11     if((dp = opendir(argv[1])) == NULL)
12         err_sys("can‘t open &s",argv[1]);
13     while ((dirp = readdir(dp)) != NULL)
14         printf("%s\n",dirp->d_name);
15 
16 
17     closedir(dp);
18     exit(0);
19 }