Typo fixes

[openssl.git] / doc / crypto / bio.pod

diff --git a/doc/crypto/bio.pod b/doc/crypto/bio.pod
index cf44a746ba68a9d03dac2fefb0ff1fb4892923df..1e1dd02106db03c1c0f1b90390e097477f2f5b6b 100644 (file)
--- a/doc/crypto/bio.pod
+++ b/doc/crypto/bio.pod
@@ -1,8 +1,12 @@
 =pod
 
+=for comment openssl_manual_section 7
+
 =head1 NAME
 
-bio - I/O abstraction
+bio - Basic I/O abstraction
+
+=for comment generic
 
 =head1 SYNOPSIS
 
@@ -34,6 +38,28 @@ BIO and one or more filter BIOs. Data read from or written to the
 first BIO then traverses the chain to the end (normally a source/sink
 BIO).
 
+
+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
 
 L<BIO_ctrl(3)>,
@@ -61,3 +87,4 @@ in the file LICENSE in the source distribution or at
 L<https://www.openssl.org/source/license.html>.
 
 =cut
+