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    BIO *bio;
    int cmd;
    long num;
    void *ptr;
{
    Tcl_Channel chan = Tls_GetParent((State*)BIO_get_data(bio));
    long ret = 1;
    int *ip;

    dprintf("BioCtrl(%p, 0x%x, 0x%x, %p)",
	    (void *) bio, (unsigned int) cmd, (unsigned int) num,
	    (void *) ptr);

    switch (cmd) {
    case BIO_CTRL_RESET:
	num = 0;
    case BIO_C_FILE_SEEK:
    case BIO_C_FILE_TELL:
	ret = 0;
	break;
    case BIO_CTRL_INFO:
	ret = 1;
	break;
#if 0
    case BIO_C_SET_FD:
        dprintf("Unsupported call: BIO_C_SET_FD");
	BioFree(bio);
        ret = -1;
	/* Sets State* */
	bio->ptr	= *((char **)ptr);
	bio->shutdown	= (int)num;
	bio->init	= 1;
	break;
        break;
    case BIO_C_GET_FD:
	if (bio->init) {
	    ip = (int *)ptr;
        dprintf("Unsupported call: BIO_C_GET_FD");
	    if (ip != NULL) {
		*ip = bio->num;
	    }
	    ret = bio->num;
	} else {
	    ret = -1;
        ret = -1;
	}
	break;
        break;
#endif
    case BIO_CTRL_GET_CLOSE:
	ret = BIO_get_shutdown(bio);
	break;
    case BIO_CTRL_SET_CLOSE:
	BIO_set_shutdown(bio, num);
	break;
    case BIO_CTRL_EOF: