fileperms.c

#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/dir.h>

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

    DIR* midir;
    if ((midir=opendir(argv[1])) < 0) {
        perror("\nError en opendir\n");
        exit(-1);
    }
    struct dirent* info_archivo;
    struct stat fileStat;

    while ((info_archivo = readdir(midir)) != NULL) {
        stat(info_archivo->d_name, &fileStat);
        printf((S_ISDIR(fileStat.st_mode))  ? "d" : "-");
        printf((fileStat.st_mode & S_IRUSR) ? "r" : "-");
        printf((fileStat.st_mode & S_IWUSR) ? "w" : "-");
        printf((fileStat.st_mode & S_IXUSR) ? "x" : "-");
        printf((fileStat.st_mode & S_IRGRP) ? "r" : "-");
        printf((fileStat.st_mode & S_IWGRP) ? "w" : "-");
        printf((fileStat.st_mode & S_IXGRP) ? "x" : "-");
        printf((fileStat.st_mode & S_IROTH) ? "r" : "-");
        printf((fileStat.st_mode & S_IWOTH) ? "w" : "-");
        printf((fileStat.st_mode & S_IXOTH) ? "x" : "-");
        printf(" %s", info_archivo->d_name);
        printf("\n");
    }
    closedir(midir);

}

ouptut

drwxr-xr-x .
drwxr-xr-x ..
-rwxr-xr-x fileperms
-rw-r--r-- fileperms.c

ls -l

total 16
drwxr-xr-x+  4 luqmaan staff  136 Dec 25 14:09 .
drwxr-xr-x+ 22 luqmaan staff  748 Dec 25 14:07 ..
-rwxr-xr-x+  1 luqmaan staff 8824 Dec 25 14:09 fileperms
-rw-r--r--+  1 luqmaan staff 1099 Dec 25 14:09 fileperms.c