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3dbf824380
There was recently an instance where a user was confused by the deprecation warnings in the docs. They believed the warning applied to the immediately preceding function declarations, when it fact it applied to the following function declarations. https://mta.openssl.org/pipermail/openssl-users/2021-December/014665.html We clarify the wording to make it clear that the warning applies to the following functions. Reviewed-by: Paul Dale <pauli@openssl.org> Reviewed-by: Tomas Mraz <tomas@openssl.org> Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/17180)
71 lines
2.3 KiB
Plaintext
71 lines
2.3 KiB
Plaintext
=pod
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=head1 NAME
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OPENSSL_fork_prepare,
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OPENSSL_fork_parent,
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OPENSSL_fork_child
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- OpenSSL fork handlers
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=head1 SYNOPSIS
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#include <openssl/crypto.h>
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The following functions have been deprecated since OpenSSL 3.0, and can be
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hidden entirely by defining B<OPENSSL_API_COMPAT> with a suitable version value,
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see L<openssl_user_macros(7)>:
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void OPENSSL_fork_prepare(void);
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void OPENSSL_fork_parent(void);
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void OPENSSL_fork_child(void);
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=head1 DESCRIPTION
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These methods are currently unused, and as such, no replacement methods are
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required or planned.
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OpenSSL has state that should be reset when a process forks. For example,
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the entropy pool used to generate random numbers (and therefore encryption
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keys) should not be shared across multiple programs.
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The OPENSSL_fork_prepare(), OPENSSL_fork_parent(), and OPENSSL_fork_child()
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functions are used to reset this internal state.
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Platforms without fork(2) will probably not need to use these functions.
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Platforms with fork(2) but without pthread_atfork(3) will probably need
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to call them manually, as described in the following paragraph. Platforms
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such as Linux that have both functions will normally not need to call these
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functions as the OpenSSL library will do so automatically.
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L<OPENSSL_init_crypto(3)> will register these functions with the appropriate
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handler, when the B<OPENSSL_INIT_ATFORK> flag is used. For other
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applications, these functions can be called directly. They should be used
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according to the calling sequence described by the pthread_atfork(3)
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documentation, which is summarized here. OPENSSL_fork_prepare() should
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be called before a fork() is done. After the fork() returns, the parent
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process should call OPENSSL_fork_parent() and the child process should
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call OPENSSL_fork_child().
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=head1 RETURN VALUES
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OPENSSL_fork_prepare(), OPENSSL_fork_parent() and OPENSSL_fork_child() do not
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return values.
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=head1 SEE ALSO
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L<OPENSSL_init_crypto(3)>
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=head1 HISTORY
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These functions were added in OpenSSL 1.1.1.
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=head1 COPYRIGHT
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Copyright 2017-2020 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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