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

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

    DIR*currentDir;
    char*dirName;
    struct dirent*entity;
    if (argc >1) {
        dirName = argv[1];
    }else
        dirName = ".";
    if ((currentDir = opendir(dirName))==NULL) {
        fprintf(stderr, "Error open dir %s; %s\n", dirName, strerror(errno));
        exit (1);
    }
    while (entity = readdir(currentDir))
            printf("index node number %ld, file name %s \n", entity->d_ino, entity->d_name);
        closedir(currentDir);

    return 0;
}