85 lines
4.8 KiB
HTML
85 lines
4.8 KiB
HTML
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<?xml version="1.0" ?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>SSL_new_stream</title>
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<meta http-equiv="content-type" content="text/html; charset=utf-8" />
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<link rev="made" href="mailto:" />
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</head>
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<body>
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<ul id="index">
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<li><a href="#NAME">NAME</a></li>
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<li><a href="#SYNOPSIS">SYNOPSIS</a></li>
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<li><a href="#DESCRIPTION">DESCRIPTION</a></li>
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<li><a href="#RETURN-VALUES">RETURN VALUES</a></li>
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<li><a href="#SEE-ALSO">SEE ALSO</a></li>
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<li><a href="#HISTORY">HISTORY</a></li>
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<li><a href="#COPYRIGHT">COPYRIGHT</a></li>
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</ul>
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<h1 id="NAME">NAME</h1>
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<p>SSL_new_stream, SSL_STREAM_FLAG_UNI, SSL_STREAM_FLAG_NO_BLOCK, SSL_STREAM_FLAG_ADVANCE - create a new locally-initiated QUIC stream</p>
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<h1 id="SYNOPSIS">SYNOPSIS</h1>
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<pre><code> #include <openssl/ssl.h>
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#define SSL_STREAM_FLAG_UNI (1U << 0)
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#define SSL_STREAM_FLAG_NO_BLOCK (1U << 1)
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#define SSL_STREAM_FLAG_ADVANCE (1U << 2)
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SSL *SSL_new_stream(SSL *ssl, uint64_t flags);</code></pre>
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<h1 id="DESCRIPTION">DESCRIPTION</h1>
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<p>The SSL_new_stream() function, when passed a QUIC connection SSL object, creates a new locally-initiated bidirectional or unidirectional QUIC stream and returns the newly created QUIC stream SSL object.</p>
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<p>If the <b>SSL_STREAM_FLAG_UNI</b> flag is passed, a unidirectional stream is created; else a bidirectional stream is created.</p>
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<p>To retrieve the stream ID of the newly created stream, use <a href="../man3/SSL_get_stream_id.html">SSL_get_stream_id(3)</a>.</p>
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<p>It is the caller's responsibility to free the QUIC stream SSL object using <a href="../man3/SSL_free.html">SSL_free(3)</a>. The lifetime of the QUIC connection SSL object must exceed that of the QUIC stream SSL object; in other words, the QUIC stream SSL object must be freed first.</p>
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<p>Once a stream has been created using SSL_new_stream(), it may be used in the normal way using <a href="../man3/SSL_read.html">SSL_read(3)</a> and <a href="../man3/SSL_write.html">SSL_write(3)</a>.</p>
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<p>This function can only be used to create stream objects for locally-initiated streams. To accept incoming streams initiated by a peer, use <a href="../man3/SSL_accept_stream.html">SSL_accept_stream(3)</a>.</p>
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<p>Calling SSL_new_stream() if there is no default stream already present inhibits the future creation of a default stream. See <a href="../man7/openssl-quic.html">openssl-quic(7)</a>.</p>
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<p>The creation of new streams is subject to flow control by the QUIC protocol. If it is currently not possible to create a new locally initiated stream of the specified type, a call to SSL_new_stream() will either block (if the connection is configured in blocking mode) until a new stream can be created, or otherwise return NULL.</p>
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<p>This function operates in blocking mode if the QUIC connection SSL object is configured in blocking mode (see <a href="../man3/SSL_set_blocking_mode.html">SSL_set_blocking_mode(3)</a>). It may also be used in nonblocking mode on a connection configured in blocking mode by passing the flag <b>SSL_STREAM_FLAG_NO_BLOCK</b>.</p>
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<p>The flag <b>SSL_STREAM_FLAG_ADVANCE</b> may be used to create a QUIC stream SSL object even if a new QUIC stream cannot yet be opened due to flow control. The caller may begin to use the new stream and fill the write buffer of the stream by calling <a href="../man3/SSL_write.html">SSL_write(3)</a>. However, no actual stream data (or QUIC frames regarding the stream) will be sent until QUIC flow control allows it. Any queued data will be sent as soon as a peer permits it. There is no guarantee the stream will be eventually created; for example, the connection could fail, or a peer might simply decide never to increase the number of allowed streams for the remainder of the connection lifetime.</p>
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<h1 id="RETURN-VALUES">RETURN VALUES</h1>
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<p>SSL_new_stream() returns a new stream object, or NULL on error.</p>
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<p>This function fails if called on a QUIC stream SSL object or on a non-QUIC SSL object.</p>
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<h1 id="SEE-ALSO">SEE ALSO</h1>
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<p><a href="../man3/SSL_accept_stream.html">SSL_accept_stream(3)</a>, <a href="../man3/SSL_free.html">SSL_free(3)</a></p>
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<h1 id="HISTORY">HISTORY</h1>
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<p>SSL_new_stream() was added in OpenSSL 3.2.</p>
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<h1 id="COPYRIGHT">COPYRIGHT</h1>
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<p>Copyright 2002-2023 The OpenSSL Project Authors. All Rights Reserved.</p>
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<p>Licensed under the Apache License 2.0 (the "License"). 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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</body>
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</html>
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