#define _GNU_SOURCE             /* See feature_test_macros(7) */
#include <sched.h>

#include <sys/syscall.h>	/* For SYS_xxx definitions */

#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>

#include <sys/types.h>
#include <sys/wait.h>


void do_clone_exec(int flags, char *cmd, char *argv[])
{
	int ret = 0;
	pid_t pid;
	int status;

	if ((pid = syscall(SYS_clone, flags, NULL))) {
	    /* parent */		
	    if (ret<0) {
	        perror("clone");
	        exit(2);
	    } else {
	        waitpid(-1, &status, __WCLONE);
	        exit(status);
	    }
	} 
	
	ret = execvp(cmd, argv);
	
	if (ret<0)
	    perror("execvp");
	exit(1);
}



int	main(int argc, char *argv[])
{
	do_clone_exec(CLONE_NEWUSER, argv[1], argv+1);
	exit(0);
}