aa3b328541
CLA: trivial Reviewed-by: Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com> Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/5801)
63 lines
2 KiB
Text
63 lines
2 KiB
Text
=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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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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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 pthreads_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 pthreads_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 2017-2018 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (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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