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Title "BIO_new 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
BIO_new, BIO_set, BIO_free, BIO_vfree, BIO_free_all - BIO allocation and freeing functions Header "SYNOPSIS" .Vb 1 #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); .Ve Header "DESCRIPTION" The BIO_new() function returns a new \s-1BIO\s0 using method type.

\fIBIO_set() sets the method of an already existing \s-1BIO.\s0

\fIBIO_free() frees up a single \s-1BIO,\s0 BIO_vfree() also frees up a single \s-1BIO\s0 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 \s-1BIO_METHOD\s0 descriptions.

\fIBIO_free_all() frees up an entire \s-1BIO\s0 chain, it does not halt if an error occurs freeing up an individual \s-1BIO\s0 in the chain.

Header "RETURN VALUES" \fIBIO_new() returns a newly created \s-1BIO\s0 or \s-1NULL\s0 if the call fails.

\fIBIO_set(), BIO_free() return 1 for success and 0 for failure.

\fIBIO_free_all() and BIO_vfree() do not return values.

Header "NOTES" Some BIOs (such as memory BIOs) can be used immediately after calling \fIBIO_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 \s-1BIO\s0 chain it will only free one \s-1BIO\s0 resulting in a memory leak.

Calling BIO_free_all() a single \s-1BIO\s0 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 \s-1BIO_METHOD.\s0 There is a naming convention for such functions: a source/sink \s-1BIO\s0 is normally called BIO_s_*() and a filter \s-1BIO\s0 BIO_f_*();

Header "EXAMPLE" Create a memory \s-1BIO:\s0

.Vb 1 BIO *mem = BIO_new(BIO_s_mem()); .Ve

Header "SEE ALSO" \s-1TBA\s0