dir.c

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <dirent.h>

#define DIR_NAME "dir"

int main(void)
{
        int i, ret;
        struct stat st;
        char *dir_path;
        struct dirent **file_list;

        dir_path = (char *)calloc(128, sizeof(char));
        if (dir_path == NULL) {
                return -1;
        }
        strncat(dir_path, DIR_NAME, 4);

        ret = stat(dir_path, &st);

        if (ret == -1) {
                printf("%s doesn't exist\n", dir_path);
                free(dir_path);
                return -1;
        }

        ret = scandir(dir_path, &file_list, NULL, NULL);
        if(ret  == -1) {
                printf("scandir failed\n");
                free(dir_path);
                return -1;
        }

        for(i=0; i<ret; ++i) {
                if (strcmp(file_list[i]->d_name, ".") == 0 ||
                        strcmp(file_list[i]->d_name, "..") == 0) {
                        continue;
                }
                printf("%s\n", file_list[i]->d_name);
                free(file_list[i]);
        }
        free(file_list);

        return 0;
}