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

int main(int argc, char** argv)
{
    char* buffer = malloc(100);
    strcpy(buffer, "Hello World\n");

    int pid = fork();

    if (pid < 0)
    {
        fprintf(stderr, "fork failed\n");
        exit(1);
    }   
    else if (pid == 0)
    {
        fprintf(stderr, "child process ");
        fprintf(stderr, "%s", buffer);
    }
    else
    {
        fprintf(stderr, "forked process %d ", pid);
        fprintf(stderr, "%s", buffer);
    }

    /* both parent and child have their own copy of buffer and need to free it */
    free(buffer);
    return 0;
}