linux中使用opdir_readdir读取目录中的信息

#include <dirent.h>
#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
     DIR          *dp;
     struct dirent     *dirp;

     if (argc != 2)
     {
          printf("usage: ls directory_name\n");
          exit(-1);
     }

     if ((dp = opendir(argv[1])) == NULL)
     {
          printf("can't open [%s]\n", argv[1]);
          exit(-2);
     }
    
     printf("==name==\t==type==\n");
     while ((dirp = readdir(dp)) != NULL)
          printf("%s\t%d\n", dirp->d_name,dirp->d_type);

     closedir(dp);
     exit(0);
}