.\" -*- mode: troff; coding: utf-8 -*- .\" Automatically generated by Pod::Man 5.01 (Pod::Simple 3.43) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" \*(C` and \*(C' are quotes in nroff, nothing in troff, for use with C<>. .ie n \{\ . ds C` "" . ds C' "" 'br\} .el\{\ . ds C` . ds C' 'br\} .\" .\" Escape single quotes in literal strings from groff's Unicode transform. .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" .\" If the F register is >0, we'll generate index entries on stderr for .\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index .\" entries marked with X<> in POD. Of course, you'll have to process the .\" output yourself in some meaningful fashion. .\" .\" Avoid warning from groff about undefined register 'F'. .de IX .. .nr rF 0 .if \n(.g .if rF .nr rF 1 .if (\n(rF:(\n(.g==0)) \{\ . if \nF \{\ . de IX . tm Index:\\$1\t\\n%\t"\\$2" .. . if !\nF==2 \{\ . nr % 0 . nr F 2 . \} . \} .\} .rr rF .\" ======================================================================== .\" .IX Title "SSL_NEW_STREAM 3ssl" .TH SSL_NEW_STREAM 3ssl 2024-04-28 3.3.0 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_new_stream, SSL_STREAM_FLAG_UNI, SSL_STREAM_FLAG_NO_BLOCK, SSL_STREAM_FLAG_ADVANCE \- create a new locally\-initiated QUIC stream .SH SYNOPSIS .IX Header "SYNOPSIS" .Vb 1 \& #include \& \& #define SSL_STREAM_FLAG_UNI (1U << 0) \& #define SSL_STREAM_FLAG_NO_BLOCK (1U << 1) \& #define SSL_STREAM_FLAG_ADVANCE (1U << 2) \& SSL *SSL_new_stream(SSL *ssl, uint64_t flags); .Ve .SH DESCRIPTION .IX Header "DESCRIPTION" The \fBSSL_new_stream()\fR 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. .PP If the \fBSSL_STREAM_FLAG_UNI\fR flag is passed, a unidirectional stream is created; else a bidirectional stream is created. .PP To retrieve the stream ID of the newly created stream, use \&\fBSSL_get_stream_id\fR\|(3). .PP It is the caller's responsibility to free the QUIC stream SSL object using \&\fBSSL_free\fR\|(3). 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. .PP Once a stream has been created using \fBSSL_new_stream()\fR, it may be used in the normal way using \fBSSL_read\fR\|(3) and \fBSSL_write\fR\|(3). .PP This function can only be used to create stream objects for locally-initiated streams. To accept incoming streams initiated by a peer, use \&\fBSSL_accept_stream\fR\|(3). .PP Calling \fBSSL_new_stream()\fR if there is no default stream already present inhibits the future creation of a default stream. See \fBopenssl\-quic\fR\|(7). .PP 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 \fBSSL_new_stream()\fR will either block (if the connection is configured in blocking mode) until a new stream can be created, or otherwise return NULL. .PP This function operates in blocking mode if the QUIC connection SSL object is configured in blocking mode (see \fBSSL_set_blocking_mode\fR\|(3)). It may also be used in nonblocking mode on a connection configured in blocking mode by passing the flag \fBSSL_STREAM_FLAG_NO_BLOCK\fR. .PP The flag \fBSSL_STREAM_FLAG_ADVANCE\fR 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 \fBSSL_write\fR\|(3). 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. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBSSL_new_stream()\fR returns a new stream object, or NULL on error. .PP This function fails if called on a QUIC stream SSL object or on a non-QUIC SSL object. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBSSL_accept_stream\fR\|(3), \fBSSL_free\fR\|(3) .SH HISTORY .IX Header "HISTORY" \&\fBSSL_new_stream()\fR was 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 "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 .