2023-01-09 19:18:06 +08:00
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=pod
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=head1 NAME
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DTLSv1_get_timeout - determine when a DTLS SSL object next needs a timeout
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event to be handled
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=head1 SYNOPSIS
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#include <openssl/ssl.h>
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int DTLSv1_get_timeout(SSL *s, struct timeval *tv);
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=head1 DESCRIPTION
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DTLSv1_get_timeout() can be used on a DTLS SSL object to determine when the
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SSL object next needs to perform internal processing due to the passage of time.
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Calling DTLSv1_get_timeout() results in I<*tv> being written with an amount of
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time left before the SSL object needs have DTLSv1_handle_timeout() called on it.
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If the SSL object needs to be ticked immediately, I<*tv> is zeroed and the
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function succeeds, returning 1. If no timeout is currently active, this function
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returns 0.
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This function is only applicable to DTLS objects. It fails if called on
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any other kind of SSL object.
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Note that the value output by a call to DTLSv1_get_timeout() may change as a
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result of other calls to the SSL object.
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Once the timeout expires, DTLSv1_handle_timeout() should be called to handle any
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internal processing which is due; for more information, see
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L<DTLSv1_handle_timeout(3)>.
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2023-05-10 18:10:57 +08:00
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L<SSL_get_tick_timeout(3)> supersedes all use cases for this this function and
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2023-01-09 19:18:06 +08:00
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may be used instead of it.
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=head1 RETURN VALUES
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On success, writes a duration to I<*tv> and returns 1.
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Returns 0 on failure, or if no timeout is currently active.
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=head1 SEE ALSO
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L<DTLSv1_handle_timeout(3)>, L<SSL_get_tick_timeout(3)>, L<ssl(7)>
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=head1 COPYRIGHT
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Copyright 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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