OPENSSL_fork_prepare, OPENSSL_fork_parent, OPENSSL_fork_child - OpenSSL fork
handlers
#include <openssl/crypto.h>
The following functions have been deprecated since OpenSSL 3.0, and can be
hidden entirely by defining
OPENSSL_API_COMPAT with a suitable version
value, see
openssl_user_macros(7):
void OPENSSL_fork_prepare(void);
void OPENSSL_fork_parent(void);
void OPENSSL_fork_child(void);
These methods are currently unused, and as such, no replacement methods are
required or planned.
OpenSSL has state that should be reset when a process forks. For example, the
entropy pool used to generate random numbers (and therefore encryption keys)
should not be shared across multiple programs. The
OPENSSL_fork_prepare(),
OPENSSL_fork_parent(), and
OPENSSL_fork_child() functions are used to reset this internal state.
Platforms without
fork(2) will probably not need to use these functions.
Platforms with
fork(2) but without
pthread_atfork(3) will
probably need to call them manually, as described in the following paragraph.
Platforms such as Linux that have both functions will normally not need to
call these functions as the OpenSSL library will do so automatically.
OPENSSL_init_crypto(3) will register these functions with the appropriate
handler, when the
OPENSSL_INIT_ATFORK flag is used. For other
applications, these functions can be called directly. They should be used
according to the calling sequence described by the
pthread_atfork(3)
documentation, which is summarized here.
OPENSSL_fork_prepare() should
be called before a
fork() is done. After the
fork() returns, the
parent process should call
OPENSSL_fork_parent() and the child process
should call
OPENSSL_fork_child().
OPENSSL_fork_prepare(),
OPENSSL_fork_parent() and
OPENSSL_fork_child() do not return values.
OPENSSL_init_crypto(3)
These functions were added in OpenSSL 1.1.1.
Copyright 2017-2021 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy in the
file LICENSE in the source distribution or at
<
https://www.openssl.org/source/license.html>.