mirror of https://github.com/openssl/openssl
82 lines
2.8 KiB
Plaintext
82 lines
2.8 KiB
Plaintext
=pod
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=head1 NAME
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SSL_accept_stream, SSL_get_accept_stream_queue_len, SSL_ACCEPT_STREAM_NO_BLOCK -
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accept an incoming QUIC stream from a QUIC peer
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=head1 SYNOPSIS
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#include <openssl/ssl.h>
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#define SSL_ACCEPT_STREAM_NO_BLOCK
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SSL *SSL_accept_stream(SSL *ssl, uint64_t flags);
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size_t SSL_get_accept_stream_queue_len(SSL *ssl);
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=head1 DESCRIPTION
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The SSL_accept_stream() function attempts to dequeue an incoming stream from the
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given QUIC connection SSL object and returns the newly allocated QUIC stream SSL
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object.
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If the queue of incoming streams is empty, this function returns NULL (in
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nonblocking mode) or waits for an incoming stream (in blocking mode). This
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function may still return NULL in blocking mode, for example if the underlying
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connection is terminated.
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The caller is responsible for managing the lifetime of the returned QUIC stream
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SSL object; for more information, see L<SSL_free(3)>.
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This function will block if the QUIC connection SSL object is configured in
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blocking mode (see L<SSL_set_blocking_mode(3)>), but this may be bypassed by
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passing the flag B<SSL_ACCEPT_STREAM_NO_BLOCK> in I<flags>. If this flag is set,
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this function never blocks.
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Calling SSL_accept_stream() if there is no default stream already present
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inhibits the future creation of a default stream. See L<openssl-quic(7)>.
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SSL_get_accept_stream_queue_len() returns the number of incoming streams
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currently waiting in the accept queue.
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These functions can be used from multiple threads for the same QUIC connection.
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Depending on whether default stream functionality is being used, it may be
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necessary to explicitly configure the incoming stream policy before streams can
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be accepted; see L<SSL_set_incoming_stream_policy(3)>. See also
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L<openssl-quic(7)/MODES OF OPERATION> for more information on default stream
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functionality.
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=head1 RETURN VALUES
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SSL_accept_stream() returns a newly allocated QUIC stream SSL object, or NULL if
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no new incoming streams are available, or if the connection has been terminated,
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or if called on a SSL object other than a QUIC connection SSL object.
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L<SSL_get_error(3)> can be used to obtain further information in this case.
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SSL_get_accept_stream_queue_len() returns the number of incoming streams
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currently waiting in the accept queue, or 0 if called on a SSL object other than
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a QUIC connection SSL object.
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=head1 SEE ALSO
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L<openssl-quic(7)/MODES OF OPERATION>, L<SSL_new_stream(3)>,
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L<SSL_set_blocking_mode(3)>, L<SSL_free(3)>
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=head1 HISTORY
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SSL_accept_stream() and SSL_get_accept_stream_queue_len() were added in OpenSSL
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3.2.
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=head1 COPYRIGHT
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Copyright 2002-2023 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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