BIO_new(3) OpenSSL BIO_new(3)NAME
BIO_new, BIO_set, BIO_free, BIO_vfree, BIO_free_all - BIO allocation
and freeing functions
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);
The 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, BIO_vfree() 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 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.
RETURN VALUESBIO_new() returns a newly created BIO or NULL if the call fails.
BIO_set(), BIO_free() return 1 for success and 0 for failure.
BIO_free_all() and BIO_vfree() do not return values.
Some BIOs (such as memory BIOs) can be used immediately after calling
BIO_new(). Others (such as file BIOs) need some additional initializa‐
tion, and frequently a utility function exists to create and initialize
If BIO_free() is called on a BIO chain it will only free one BIO
resulting in a memory leak.
Calling BIO_free_all() a single BIO has the same effect as calling
BIO_free() on it other than the discarded return value.
Normally the type argument is supplied by a function which returns a
pointer to a BIO_METHOD. There is a naming convention for such func‐
tions: a source/sink BIO is normally called BIO_s_*() and a filter BIO
Create a memory BIO:
BIO *mem = BIO_new(BIO_s_mem());
1.0.0h 2000-09-16 BIO_new(3)