#include <stdio.h>
#include <linux/sched.h>
#include <sys/types.h>
#include <sys/mount.h>
#include <dirent.h>
       #define _GNU_SOURCE
       #include <sched.h>
#include <stdint.h>
#include <errno.h>

struct args {
    int c;
    char **v;
};

uint8_t CSTACK[8192];

int myreaddir(void *fooargs) {
    int len;
    struct dirent *pDirent;
    DIR *pDir;
    struct args *myargs = (struct args *) fooargs;

    if (myargs->c < 2) {
        printf ("Usage: testprog <dirname>\n");
        return 1;
    }

    mount(NULL, myargs->v[1], NULL, MS_PRIVATE, NULL);
    mount(NULL, ".", NULL, MS_PRIVATE, NULL);
    umount(myargs->v[1]);

    pDir = opendir (myargs->v[1]);
    if (pDir == NULL) {
        printf ("Cannot open directory '%s'\n", myargs->v[1]);
        return 1;
    }

    while ((pDirent = readdir(pDir)) != NULL) {
        printf ("[%s]\n", pDirent->d_name);
    }
    closedir (pDir);
    return 0;
}

int main (int c, char *v[]) {
    struct args fooargs = {c: c, v: v};

    int ret = clone(&myreaddir, CSTACK+8192, CLONE_NEWUTS|CLONE_NEWNS|CLONE_NEWCGROUP|CLONE_NEWIPC|CLONE_NEWNET|CLONE_NEWPID, (void *) &fooargs);

    printf("%05d %05d\n", ret, errno);
}