=head1 NAME
- BIO_new, BIO_set, BIO_free, BIO_vfree, BIO_free_all - BIO allocation and freeing functions
+BIO_new, BIO_set, BIO_up_ref, BIO_free, BIO_vfree, BIO_free_all - BIO allocation and freeing functions
=head1 SYNOPSIS
#include <openssl/bio.h>
- BIO * BIO_new(BIO_METHOD *type);
- int BIO_set(BIO *a,BIO_METHOD *type);
+ 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);
BIO_set() sets the method of an already existing BIO.
+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. Calling BIO_free() may also have some effect
+but it does not return a value.
+If B<a> 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<a> is NULL nothing is done.
=head1 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_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
Some BIOs (such as memory BIOs) can be used immediately after calling
-BIO_new(). Others (such as file BIOs) need some additional initialisation,
+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