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

int main(int argc, char** argv)
{
    /* here are the args for ps to display all processes run by user root */
    /* by convention the first argument is also the name of the command to be run */
    char *const args[4] = {"/bin/ps", "-u", "root", 0};

    execve("/bin/ps", args, NULL);

    fprintf(stderr, "execve failed, or else we wouldn't be here\n");

    return 0;
}