foo.c

        } else if (!gethostname(hostname + sizeof(HOSTNAME_PREFIX) - 1,         
                                HOST_NAME_MAX + 1 - sizeof(HOSTNAME_PREFIX)) || 
                   errno == ENAMETOOLONG) {                                     
                hostname[HOST_NAME_MAX] = '\0';                                 
                if (sethostname(hostname, strlen(hostname)))                    
                        warn("Unable to set pasta-prefixed hostname");          
        }