| 1 | =pod
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| 2 |
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| 3 | =head1 NAME
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| 4 |
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| 5 | OPENSSL_fork_prepare,
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| 6 | OPENSSL_fork_parent,
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| 7 | OPENSSL_fork_child
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| 8 | - OpenSSL fork handlers
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| 9 |
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| 10 | =head1 SYNOPSIS
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| 11 |
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| 12 | #include <openssl/crypto.h>
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| 13 |
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| 14 | void OPENSSL_fork_prepare(void);
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| 15 | void OPENSSL_fork_parent(void);
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| 16 | void OPENSSL_fork_child(void);
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| 17 |
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| 18 | =head1 DESCRIPTION
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| 19 |
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| 20 | OpenSSL has state that should be reset when a process forks. For example,
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| 21 | the entropy pool used to generate random numbers (and therefore encryption
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| 22 | keys) should not be shared across multiple programs.
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| 23 | The OPENSSL_fork_prepare(), OPENSSL_fork_parent(), and OPENSSL_fork_child()
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| 24 | functions are used to reset this internal state.
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| 25 |
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| 26 | Platforms without fork(2) will probably not need to use these functions.
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| 27 | Platforms with fork(2) but without pthread_atfork(3) will probably need
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| 28 | to call them manually, as described in the following paragraph. Platforms
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| 29 | such as Linux that have both functions will normally not need to call these
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| 30 | functions as the OpenSSL library will do so automatically.
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| 31 |
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| 32 | L<OPENSSL_init_crypto(3)> will register these functions with the appropriate
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| 33 | handler, when the B<OPENSSL_INIT_ATFORK> flag is used. For other
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| 34 | applications, these functions can be called directly. They should be used
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| 35 | according to the calling sequence described by the pthread_atfork(3)
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| 36 | documentation, which is summarized here. OPENSSL_fork_prepare() should
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| 37 | be called before a fork() is done. After the fork() returns, the parent
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| 38 | process should call OPENSSL_fork_parent() and the child process should
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| 39 | call OPENSSL_fork_child().
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| 40 |
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| 41 | =head1 RETURN VALUES
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| 42 |
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| 43 | OPENSSL_fork_prepare(), OPENSSL_fork_parent() and OPENSSL_fork_child() do not
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| 44 | return values.
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| 45 |
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| 46 | =head1 SEE ALSO
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| 47 |
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| 48 | L<OPENSSL_init_crypto(3)>
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| 49 |
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| 50 | =head1 HISTORY
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| 51 |
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| 52 | These functions were added in OpenSSL 1.1.1.
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| 53 |
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| 54 | =head1 COPYRIGHT
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| 55 |
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| 56 | Copyright 2017-2019 The OpenSSL Project Authors. All Rights Reserved.
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| 57 |
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| 58 | Licensed under the OpenSSL license (the "License"). You may not use
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| 59 | this file except in compliance with the License. You can obtain a copy
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| 60 | in the file LICENSE in the source distribution or at
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| 61 | L<https://www.openssl.org/source/license.html>.
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| 62 |
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| 63 | =cut
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