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BIO_new(3) OpenSSL BIO_new(3)
NAME
BIO_new, BIO_set, BIO_free, BIO_vfree, BIO_free_all - BIO allocation and freeing functions
SYNOPSIS
#include <openssl/bio.h>
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);
DESCRIPTION
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 VALUES
BIO_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.
NOTES
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.
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 functions: a source/sink BIO is normally
called BIO_s_*() and a filter BIO BIO_f_*();
EXAMPLE
Create a memory BIO:
BIO *mem = BIO_new(BIO_s_mem());
SEE ALSO
TBA
1.0.2k 2017-01-26 BIO_new(3)
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