BIO_new, BIO_set, BIO_free, BIO_vfree, BIO_free_all - BIO allocation and
BIO * BIO_new(BIO_METHOD *type);
int BIO_set(BIO *a,BIO_METHOD *type);
int BIO_free(BIO *a);
void BIO_vfree(BIO *a);
void BIO_free_all(BIO *a);
BIO_new() function returns a new BIO using method type.
BIO_set() sets the method of an already existing BIO.
BIO_free() frees up a single BIO,
also frees up a single BIO but it does not return a value. 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
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.
BIO_new() returns a newly created BIO or NULL if the call
BIO_free() return 1 for success and 0
BIO_vfree() do not return
Some BIOs (such as memory BIOs) can be used immediately after calling
BIO_new(). Others (such as file BIOs) need some additional
initialization, and frequently a utility function exists to create and
initialize such BIOs.
BIO_free() is called on a BIO chain it will only free one
BIO resulting in a memory leak.
BIO_free_all() a single BIO has the same effect as
BIO_free() on it other than the discarded return
Normally the type argument is supplied by a function which returns a pointer to a BIO_METHOD.
There is a naming convention for such functions: a source/sink BIO is
normally called BIO_s_*() and a filter BIO BIO_f_*();
Create a memory BIO:
BIO *mem = BIO_new(BIO_s_mem());