SSL_ACCEPT_STREAM(3ossl) OpenSSL SSL_ACCEPT_STREAM(3ossl)
NAME
SSL_accept_stream, SSL_get_accept_stream_queue_len,
SSL_ACCEPT_STREAM_NO_BLOCK - accept an incoming QUIC stream from a QUIC
peer
SYNOPSIS
#include <openssl/ssl.h>
#define SSL_ACCEPT_STREAM_NO_BLOCK
SSL *SSL_accept_stream(SSL *ssl, uint64_t flags);
size_t SSL_get_accept_stream_queue_len(SSL *ssl);
DESCRIPTION
The SSL_accept_stream(3) function attempts to dequeue an incoming stream
from the given QUIC connection SSL object and returns the newly
allocated QUIC stream SSL object.
If the queue of incoming streams is empty, this function returns NULL
(in nonblocking mode) or waits for an incoming stream (in blocking
mode). This function may still return NULL in blocking mode, for
example if the underlying connection is terminated.
The caller is responsible for managing the lifetime of the returned
QUIC stream SSL object; for more information, see SSL_free(3).
This function will block if the QUIC connection SSL object is
configured in blocking mode (see SSL_set_blocking_mode(3)), but this
may be bypassed by passing the flag SSL_ACCEPT_STREAM_NO_BLOCK in
flags. If this flag is set, this function never blocks.
Calling SSL_accept_stream(3) if there is no default stream already
present inhibits the future creation of a default stream. See
openssl-quic(7).
SSL_get_accept_stream_queue_len() returns the number of incoming
streams currently waiting in the accept queue.
These functions can be used from multiple threads for the same QUIC
connection.
Depending on whether default stream functionality is being used, it may
be necessary to explicitly configure the incoming stream policy before
streams can be accepted; see SSL_set_incoming_stream_policy(3). See
also "MODES OF OPERATION" in openssl-quic(7) for more information on
default stream functionality.
RETURN VALUES
SSL_accept_stream(3) returns a newly allocated QUIC stream SSL object,
or NULL if no new incoming streams are available, or if the connection
has been terminated, or if called on an SSL object other than a QUIC
connection SSL object. SSL_get_error(3) can be used to obtain further
information in this case.
SSL_get_accept_stream_queue_len() returns the number of incoming
streams currently waiting in the accept queue, or 0 if called on an SSL
object other than a QUIC connection SSL object.
SEE ALSO
"MODES OF OPERATION" in openssl-quic(7), SSL_new_stream(3),
SSL_set_blocking_mode(3), SSL_free(3)
HISTORY
SSL_accept_stream(3) and SSL_get_accept_stream_queue_len() were added in
OpenSSL 3.2.
COPYRIGHT
Copyright 2002-2023 The OpenSSL Project Authors. All Rights Reserved.
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
<https://www.openssl.org/source/license.html>.
3.5.0 2025-04-10 SSL_ACCEPT_STREAM(3ossl)
openssl 3.5.0 - Generated Sun Apr 27 13:48:31 CDT 2025