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

void print_array(int argc, char *argv[]) {
    // Helper function to print given array with given length.
    int i = 0;
    int j = 0;
    for (i = 0; i < argc; i ++) {
        j = 0;
        while(argv[i][j] != '\0')
            printf("%c", argv[i][j++]);
        printf(" ");
    }
    printf("\n");
}
int main(int argc, char *argv[]) {
    int count;
    // Last item acts as null pointer.
    char **copy = calloc(sizeof(char *), argc);
    // Slice first given command line argument.
    for (count = 0; count < argc - 1; count++)
        copy[count] = strdup(argv[count + 1]);
    // Adding systemd indicator to preserve wrapped process during changing
    // root filesystem. We mark wrapper and child process.
    argv[0][0] = '@';
    copy[0][0] = '@';
    if (-1 == execvp(argv[1], copy)) {
        perror("Executing child process failed.");
        return -1;
    }
}