int main(int argc, char *argv[], char *environ[]) {
    int rv;
    size_t mem_used = 0, mem_rollback;

    g_memory.used = 0; g_memory.max = MB(10);
    unsigned int shmid_ = shmget(IPC_PRIVATE, g_memory.max, IPC_CREAT | 0777);
    g_memory.base = shmat(shmid_, 0, 0);
    g_memory.name = "main_memory";

    struct buffer print_buffer = buffer_child(&g_memory, KB(512), "print_main");

    {
        u64 start = print_buffer.used;
        buffer_copy_string(&print_buffer, "READY FOR LIFTOFF!\n");
        cvt_int_to_string(&print_buffer, 100);
        buffer_copy_string(&print_buffer, "\n");
        write(0, print_buffer.base + start, (print_buffer.used - start));
    }

#if 1
    char *xauthority_path = "/home/ian/.Xauthority";
#else
    char *xauthority_path = NULL;
    for (int i = 0; environ[i]; ++i) {
        if (strcmp("XAUTHORITY", environ[i])) {
            int len = strlen(environ[i] + 11);
            xauthority_path = (char *)g_memory.base + g_memory.used;
            for (int j = 0; j < len; ++j)
                xauthority_path[j] = environ[i][11 + j];
            xauthority_path[len] = '\0';
            g_memory.used = len + 1;
            my_assert(g_memory.used < g_memory.max);
        }
    }
#endif