Android_verify/third_party/android-libs/share/man/man3/SSL_accept_stream.3ossl

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.\" ========================================================================
.\"
.IX Title "SSL_ACCEPT_STREAM 3ossl"
.TH SSL_ACCEPT_STREAM 3ossl "2024-09-03" "3.3.2" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
SSL_accept_stream, SSL_get_accept_stream_queue_len, SSL_ACCEPT_STREAM_NO_BLOCK \-
accept an incoming QUIC stream from a QUIC peer
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #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);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \fBSSL_accept_stream()\fR function attempts to dequeue an incoming stream from the
given \s-1QUIC\s0 connection \s-1SSL\s0 object and returns the newly allocated \s-1QUIC\s0 stream \s-1SSL\s0
object.
.PP
If the queue of incoming streams is empty, this function returns \s-1NULL\s0 (in
nonblocking mode) or waits for an incoming stream (in blocking mode). This
function may still return \s-1NULL\s0 in blocking mode, for example if the underlying
connection is terminated.
.PP
The caller is responsible for managing the lifetime of the returned \s-1QUIC\s0 stream
\&\s-1SSL\s0 object; for more information, see \fBSSL_free\fR\|(3).
.PP
This function will block if the \s-1QUIC\s0 connection \s-1SSL\s0 object is configured in
blocking mode (see \fBSSL_set_blocking_mode\fR\|(3)), but this may be bypassed by
passing the flag \fB\s-1SSL_ACCEPT_STREAM_NO_BLOCK\s0\fR in \fIflags\fR. If this flag is set,
this function never blocks.
.PP
Calling \fBSSL_accept_stream()\fR if there is no default stream already present
inhibits the future creation of a default stream. See \fBopenssl\-quic\fR\|(7).
.PP
\&\fBSSL_get_accept_stream_queue_len()\fR returns the number of incoming streams
currently waiting in the accept queue.
.PP
These functions can be used from multiple threads for the same \s-1QUIC\s0 connection.
.PP
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 \fBSSL_set_incoming_stream_policy\fR\|(3). See also
\&\*(L"\s-1MODES OF OPERATION\*(R"\s0 in \fBopenssl\-quic\fR\|(7) for more information on default stream
functionality.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBSSL_accept_stream()\fR returns a newly allocated \s-1QUIC\s0 stream \s-1SSL\s0 object, or \s-1NULL\s0 if
no new incoming streams are available, or if the connection has been terminated,
or if called on a \s-1SSL\s0 object other than a \s-1QUIC\s0 connection \s-1SSL\s0 object.
\&\fBSSL_get_error\fR\|(3) can be used to obtain further information in this case.
.PP
\&\fBSSL_get_accept_stream_queue_len()\fR returns the number of incoming streams
currently waiting in the accept queue, or 0 if called on a \s-1SSL\s0 object other than
a \s-1QUIC\s0 connection \s-1SSL\s0 object.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\*(L"\s-1MODES OF OPERATION\*(R"\s0 in \fBopenssl\-quic\fR\|(7), \fBSSL_new_stream\fR\|(3),
\&\fBSSL_set_blocking_mode\fR\|(3), \fBSSL_free\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
\&\fBSSL_accept_stream()\fR and \fBSSL_get_accept_stream_queue_len()\fR were added in OpenSSL
3.2.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2002\-2023 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.