8 - OpenSSL fork handlers
12 #include <openssl/crypto.h>
14 void OPENSSL_fork_prepare(void);
15 void OPENSSL_fork_parent(void);
16 void OPENSSL_fork_child(void);
20 OpenSSL has state that should be reset when a process forks. For example,
21 the entropy pool used to generate random numbers (and therefore encryption
22 keys) should not be shared across multiple programs.
23 The OPENSSL_fork_prepare(), OPENSSL_fork_parent(), and OPENSSL_fork_child()
24 functions are used to reset this internal state.
26 Platforms without fork(2) will probably not need to use these functions.
27 Platforms with fork(2) but without pthreads_atfork(3) will probably need
28 to call them manually, as described in the following paragraph. Platforms
29 such as Linux that have both functions will normally not need to call these
30 functions as the OpenSSL library will do so automatically.
32 L<OPENSSL_init_crypto(3)> will register these functions with the appropriate
33 handler, when the B<OPENSSL_INIT_ATFORK> flag is used. For other
34 applications, these functions can be called directly. They should be used
35 according to the calling sequence described by the pthreads_atfork(3)
36 documentation, which is summarized here. OPENSSL_fork_prepare() should
37 be called before a fork() is done. After the fork() returns, the parent
38 process should call OPENSSL_fork_parent() and the child process should
39 call OPENSSL_fork_child().
43 OPENSSL_fork_prepare(), OPENSSL_fork_parent() and OPENSSL_fork_child() do not
48 L<OPENSSL_init_crypto(3)>
52 These functions were added in OpenSSL 1.1.1.
56 Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.
58 Licensed under the OpenSSL license (the "License"). You may not use
59 this file except in compliance with the License. You can obtain a copy
60 in the file LICENSE in the source distribution or at
61 L<https://www.openssl.org/source/license.html>.