Unix/linux系统调用_目录与文件

#include "apue.h"
#include <dirent.h>
/*文件目录测试*/
int main(int argc, char * argv[])
{
 DIR *dp;
 struct dirent * dirp;
 if(argc != 2)
 {
  err_quit("usage:ls directory_name");
 }
 
 if((dp = opendir(argv[1]))== NULL)
 { 
  err_sys("can't open %s",argv[1]);
 }
 
 while((dirp=readdir(dp))!= NULL)
 {
  printf("%s\n",dirp->d_name);
 }
 
 closedir(dp);
}