=pod =head1 NAME BIO_new, BIO_up_ref, BIO_free, BIO_vfree, BIO_free_all, BIO_set - BIO allocation and freeing functions =head1 SYNOPSIS #include BIO * BIO_new(const BIO_METHOD *type); int BIO_set(BIO *a, const BIO_METHOD *type); int BIO_up_ref(BIO *a); int BIO_free(BIO *a); void BIO_vfree(BIO *a); void BIO_free_all(BIO *a); =head1 DESCRIPTION The BIO_new() function returns a new BIO using method B. BIO_up_ref() increments the reference count associated with the BIO object. BIO_free() frees up a single BIO, BIO_vfree() also frees up a single BIO but it does not return a value. If B is NULL nothing is done. Calling BIO_free() may also have some effect on the underlying I/O structure, for example it may close the file being referred to under certain circumstances. For more details see the individual BIO_METHOD descriptions. BIO_free_all() frees up an entire BIO chain, it does not halt if an error occurs freeing up an individual BIO in the chain. If B is NULL nothing is done. =head1 RETURN VALUES BIO_new() returns a newly created BIO or NULL if the call fails. BIO_set(), BIO_up_ref() and BIO_free() return 1 for success and 0 for failure. BIO_free_all() and BIO_vfree() do not return values. =head1 NOTES If BIO_free() is called on a BIO chain it will only free one BIO resulting in a memory leak. Calling BIO_free_all() on a single BIO has the same effect as calling BIO_free() on it other than the discarded return value. =head1 HISTORY BIO_set() was removed in OpenSSL 1.1.0 as BIO type is now opaque. =head1 EXAMPLE Create a memory BIO: BIO *mem = BIO_new(BIO_s_mem()); =head1 COPYRIGHT Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved. Licensed under the OpenSSL license (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at L. =cut