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+.\" ========================================================================
+.\"
+.IX Title "OPENSSL_FORK_PREPARE 3"
+.TH OPENSSL_FORK_PREPARE 3 "2018-09-11" "1.1.1" "OpenSSL"
+.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH "NAME"
+OPENSSL_fork_prepare, OPENSSL_fork_parent, OPENSSL_fork_child \&\- OpenSSL fork handlers
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/crypto.h>
+\&
+\& void OPENSSL_fork_prepare(void);
+\& void OPENSSL_fork_parent(void);
+\& void OPENSSL_fork_child(void);
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+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 \fIOPENSSL_fork_prepare()\fR, \fIOPENSSL_fork_parent()\fR, and \fIOPENSSL_fork_child()\fR
+functions are used to reset this internal state.
+.PP
+Platforms without \fIfork\fR\|(2) will probably not need to use these functions.
+Platforms with \fIfork\fR\|(2) but without \fIpthreads_atfork\fR\|(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.
+.PP
+\&\fIOPENSSL_init_crypto\fR\|(3) will register these functions with the appropriate
+handler, when the \fB\s-1OPENSSL_INIT_ATFORK\s0\fR flag is used. For other
+applications, these functions can be called directly. They should be used
+according to the calling sequence described by the \fIpthreads_atfork\fR\|(3)
+documentation, which is summarized here.  \fIOPENSSL_fork_prepare()\fR should
+be called before a \fIfork()\fR is done.  After the \fIfork()\fR returns, the parent
+process should call \fIOPENSSL_fork_parent()\fR and the child process should
+call \fIOPENSSL_fork_child()\fR.
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+\&\fIOPENSSL_fork_prepare()\fR, \fIOPENSSL_fork_parent()\fR and \fIOPENSSL_fork_child()\fR do not
+return values.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+\&\fIOPENSSL_init_crypto\fR\|(3)
+.SH "HISTORY"
+.IX Header "HISTORY"
+These functions were added in OpenSSL 1.1.1.
+.SH "COPYRIGHT"
+.IX Header "COPYRIGHT"
+Copyright 2017\-2018 The OpenSSL Project Authors. All Rights Reserved.
+.PP
+Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
+this file except in compliance with the License.  You can obtain a copy
+in the file \s-1LICENSE\s0 in the source distribution or at
+<https://www.openssl.org/source/license.html>.