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<ul id="index">
  <li><a href="#NAME">NAME</a></li>
  <li><a href="#SYNOPSIS">SYNOPSIS</a></li>
  <li><a href="#DESCRIPTION">DESCRIPTION</a></li>
  <li><a href="#RETURN-VALUES">RETURN VALUES</a></li>
  <li><a href="#SEE-ALSO">SEE ALSO</a></li>
  <li><a href="#HISTORY">HISTORY</a></li>
  <li><a href="#COPYRIGHT">COPYRIGHT</a></li>
</ul>

<h1 id="NAME">NAME</h1>

<p>BIO_get_new_index, BIO_meth_new, BIO_meth_free, BIO_meth_get_read_ex, BIO_meth_set_read_ex, BIO_meth_get_write_ex, BIO_meth_set_write_ex, BIO_meth_get_write, BIO_meth_set_write, BIO_meth_get_read, BIO_meth_set_read, BIO_meth_get_puts, BIO_meth_set_puts, BIO_meth_get_gets, BIO_meth_set_gets, BIO_meth_get_ctrl, BIO_meth_set_ctrl, BIO_meth_get_create, BIO_meth_set_create, BIO_meth_get_destroy, BIO_meth_set_destroy, BIO_meth_get_callback_ctrl, BIO_meth_set_callback_ctrl - Routines to build up BIO methods</p>

<h1 id="SYNOPSIS">SYNOPSIS</h1>

<pre><code> #include &lt;openssl/bio.h&gt;

 int BIO_get_new_index(void);

 BIO_METHOD *BIO_meth_new(int type, const char *name);

 void BIO_meth_free(BIO_METHOD *biom);

 int (*BIO_meth_get_write_ex(const BIO_METHOD *biom))(BIO *, const char *, size_t,
                                                size_t *);
 int (*BIO_meth_get_write(const BIO_METHOD *biom))(BIO *, const char *, int);
 int BIO_meth_set_write_ex(BIO_METHOD *biom,
                           int (*bwrite)(BIO *, const char *, size_t, size_t *));
 int BIO_meth_set_write(BIO_METHOD *biom,
                        int (*write)(BIO *, const char *, int));

 int (*BIO_meth_get_read_ex(const BIO_METHOD *biom))(BIO *, char *, size_t, size_t *);
 int (*BIO_meth_get_read(const BIO_METHOD *biom))(BIO *, char *, int);
 int BIO_meth_set_read_ex(BIO_METHOD *biom,
                          int (*bread)(BIO *, char *, size_t, size_t *));
 int BIO_meth_set_read(BIO_METHOD *biom, int (*read)(BIO *, char *, int));

 int (*BIO_meth_get_puts(const BIO_METHOD *biom))(BIO *, const char *);
 int BIO_meth_set_puts(BIO_METHOD *biom, int (*puts)(BIO *, const char *));

 int (*BIO_meth_get_gets(const BIO_METHOD *biom))(BIO *, char *, int);
 int BIO_meth_set_gets(BIO_METHOD *biom,
                       int (*gets)(BIO *, char *, int));

 long (*BIO_meth_get_ctrl(const BIO_METHOD *biom))(BIO *, int, long, void *);
 int BIO_meth_set_ctrl(BIO_METHOD *biom,
                       long (*ctrl)(BIO *, int, long, void *));

 int (*BIO_meth_get_create(const BIO_METHOD *bion))(BIO *);
 int BIO_meth_set_create(BIO_METHOD *biom, int (*create)(BIO *));

 int (*BIO_meth_get_destroy(const BIO_METHOD *biom))(BIO *);
 int BIO_meth_set_destroy(BIO_METHOD *biom, int (*destroy)(BIO *));

 long (*BIO_meth_get_callback_ctrl(const BIO_METHOD *biom))(BIO *, int, BIO_info_cb *);
 int BIO_meth_set_callback_ctrl(BIO_METHOD *biom,
                                long (*callback_ctrl)(BIO *, int, BIO_info_cb *));</code></pre>

<h1 id="DESCRIPTION">DESCRIPTION</h1>

<p>The <b>BIO_METHOD</b> type is a structure used for the implementation of new BIO types. It provides a set of functions used by OpenSSL for the implementation of the various BIO capabilities. See the <a href="/../man7/bio.html">bio</a> page for more information.</p>

<p>BIO_meth_new() creates a new <b>BIO_METHOD</b> structure. It should be given a unique integer <b>type</b> and a string that represents its <b>name</b>. Use BIO_get_new_index() to get the value for <b>type</b>.</p>

<p>The set of standard OpenSSL provided BIO types is provided in <b>bio.h</b>. Some examples include <b>BIO_TYPE_BUFFER</b> and <b>BIO_TYPE_CIPHER</b>. Filter BIOs should have a type which have the &quot;filter&quot; bit set (<b>BIO_TYPE_FILTER</b>). Source/sink BIOs should have the &quot;source/sink&quot; bit set (<b>BIO_TYPE_SOURCE_SINK</b>). File descriptor based BIOs (e.g. socket, fd, connect, accept etc) should additionally have the &quot;descriptor&quot; bit set (<b>BIO_TYPE_DESCRIPTOR</b>). See the <a href="/../man3/BIO_find_type.html">BIO_find_type</a> page for more information.</p>

<p>BIO_meth_free() destroys a <b>BIO_METHOD</b> structure and frees up any memory associated with it.</p>

<p>BIO_meth_get_write_ex() and BIO_meth_set_write_ex() get and set the function used for writing arbitrary length data to the BIO respectively. This function will be called in response to the application calling BIO_write_ex() or BIO_write(). The parameters for the function have the same meaning as for BIO_write_ex(). Older code may call BIO_meth_get_write() and BIO_meth_set_write() instead. Applications should not call both BIO_meth_set_write_ex() and BIO_meth_set_write() or call BIO_meth_get_write() when the function was set with BIO_meth_set_write_ex().</p>

<p>BIO_meth_get_read_ex() and BIO_meth_set_read_ex() get and set the function used for reading arbitrary length data from the BIO respectively. This function will be called in response to the application calling BIO_read_ex() or BIO_read(). The parameters for the function have the same meaning as for BIO_read_ex(). Older code may call BIO_meth_get_read() and BIO_meth_set_read() instead. Applications should not call both BIO_meth_set_read_ex() and BIO_meth_set_read() or call BIO_meth_get_read() when the function was set with BIO_meth_set_read_ex().</p>

<p>BIO_meth_get_puts() and BIO_meth_set_puts() get and set the function used for writing a NULL terminated string to the BIO respectively. This function will be called in response to the application calling BIO_puts(). The parameters for the function have the same meaning as for BIO_puts().</p>

<p>BIO_meth_get_gets() and BIO_meth_set_gets() get and set the function typically used for reading a line of data from the BIO respectively (see the <a href="../man3/BIO_gets.html">BIO_gets(3)</a> page for more information). This function will be called in response to the application calling BIO_gets(). The parameters for the function have the same meaning as for BIO_gets().</p>

<p>BIO_meth_get_ctrl() and BIO_meth_set_ctrl() get and set the function used for processing ctrl messages in the BIO respectively. See the <a href="/../man3/BIO_ctrl.html">BIO_ctrl</a> page for more information. This function will be called in response to the application calling BIO_ctrl(). The parameters for the function have the same meaning as for BIO_ctrl().</p>

<p>BIO_meth_get_create() and BIO_meth_set_create() get and set the function used for creating a new instance of the BIO respectively. This function will be called in response to the application calling BIO_new() and passing in a pointer to the current BIO_METHOD. The BIO_new() function will allocate the memory for the new BIO, and a pointer to this newly allocated structure will be passed as a parameter to the function.</p>

<p>BIO_meth_get_destroy() and BIO_meth_set_destroy() get and set the function used for destroying an instance of a BIO respectively. This function will be called in response to the application calling BIO_free(). A pointer to the BIO to be destroyed is passed as a parameter. The destroy function should be used for BIO specific clean up. The memory for the BIO itself should not be freed by this function.</p>

<p>BIO_meth_get_callback_ctrl() and BIO_meth_set_callback_ctrl() get and set the function used for processing callback ctrl messages in the BIO respectively. See the <a href="../man3/BIO_callback_ctrl.html">BIO_callback_ctrl(3)</a> page for more information. This function will be called in response to the application calling BIO_callback_ctrl(). The parameters for the function have the same meaning as for BIO_callback_ctrl().</p>

<h1 id="RETURN-VALUES">RETURN VALUES</h1>

<p>BIO_get_new_index() returns the new BIO type value or -1 if an error occurred.</p>

<p>BIO_meth_new(int type, const char *name) returns a valid <b>BIO_METHOD</b> or NULL if an error occurred.</p>

<p>The <b>BIO_meth_set</b> functions return 1 on success or 0 on error.</p>

<p>The <b>BIO_meth_get</b> functions return the corresponding function pointers.</p>

<h1 id="SEE-ALSO">SEE ALSO</h1>

<p><a href="/../man7/bio.html">bio</a>, <a href="/../man3/BIO_find_type.html">BIO_find_type</a>, <a href="/../man3/BIO_ctrl.html">BIO_ctrl</a>, <a>BIO_read_ex</a>, <a href="/../man3/BIO_new.html">BIO_new</a></p>

<h1 id="HISTORY">HISTORY</h1>

<p>The functions described here were added in OpenSSL 1.1.0.</p>

<h1 id="COPYRIGHT">COPYRIGHT</h1>

<p>Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.</p>

<p>Licensed under the OpenSSL license (the &quot;License&quot;). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>


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