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author | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
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committer | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
commit | 3562e78743202e43aec8727005182a2558117eca (patch) | |
tree | 8f9113a77d12470c5c851a2a8e4cb02e89df7d43 /openssl/doc/crypto/BIO_new.pod | |
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Diffstat (limited to 'openssl/doc/crypto/BIO_new.pod')
-rw-r--r-- | openssl/doc/crypto/BIO_new.pod | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/openssl/doc/crypto/BIO_new.pod b/openssl/doc/crypto/BIO_new.pod new file mode 100644 index 000000000..2a245fc8d --- /dev/null +++ b/openssl/doc/crypto/BIO_new.pod @@ -0,0 +1,65 @@ +=pod + +=head1 NAME + +BIO_new, BIO_set, 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); + int BIO_free(BIO *a); + void BIO_vfree(BIO *a); + void BIO_free_all(BIO *a); + +=head1 DESCRIPTION + +The BIO_new() function returns a new BIO using method B<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. + +=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_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 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 B<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_*(); + +=head1 EXAMPLE + +Create a memory BIO: + + BIO *mem = BIO_new(BIO_s_mem()); + +=head1 SEE ALSO + +TBA |