BIO_new(3)

     BIO_new(3)             0.9.6h (2000-09-16)             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

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     BIO_new(3)             0.9.6h (2000-09-16)             BIO_new(3)

          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

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