1OPENSSL_FORK_PREPARE(3)             OpenSSL            OPENSSL_FORK_PREPARE(3)
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NAME

6       OPENSSL_fork_prepare, OPENSSL_fork_parent, OPENSSL_fork_child - OpenSSL
7       fork handlers
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SYNOPSIS

10        #include <openssl/crypto.h>
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12        void OPENSSL_fork_prepare(void);
13        void OPENSSL_fork_parent(void);
14        void OPENSSL_fork_child(void);
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DESCRIPTION

17       OpenSSL has state that should be reset when a process forks. For
18       example, the entropy pool used to generate random numbers (and
19       therefore encryption keys) should not be shared across multiple
20       programs.  The OPENSSL_fork_prepare(), OPENSSL_fork_parent(), and
21       OPENSSL_fork_child() functions are used to reset this internal state.
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23       Platforms without fork(2) will probably not need to use these
24       functions.  Platforms with fork(2) but without pthread_atfork(3) will
25       probably need to call them manually, as described in the following
26       paragraph.  Platforms such as Linux that have both functions will
27       normally not need to call these functions as the OpenSSL library will
28       do so automatically.
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30       OPENSSL_init_crypto(3) will register these functions with the
31       appropriate handler, when the OPENSSL_INIT_ATFORK flag is used. For
32       other applications, these functions can be called directly. They should
33       be used according to the calling sequence described by the
34       pthread_atfork(3) documentation, which is summarized here.
35       OPENSSL_fork_prepare() should be called before a fork() is done.  After
36       the fork() returns, the parent process should call
37       OPENSSL_fork_parent() and the child process should call
38       OPENSSL_fork_child().
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RETURN VALUES

41       OPENSSL_fork_prepare(), OPENSSL_fork_parent() and OPENSSL_fork_child()
42       do not return values.
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SEE ALSO

45       OPENSSL_init_crypto(3)
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HISTORY

48       These functions were added in OpenSSL 1.1.1.
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51       Copyright 2017-2019 The OpenSSL Project Authors. All Rights Reserved.
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53       Licensed under the OpenSSL license (the "License").  You may not use
54       this file except in compliance with the License.  You can obtain a copy
55       in the file LICENSE in the source distribution or at
56       <https://www.openssl.org/source/license.html>.
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601.1.1l                            2021-09-15           OPENSSL_FORK_PREPARE(3)
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