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OPENSSL_fork_prepare.3
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.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. \*(C+ will .\" give a nicer C++. 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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 \fBOPENSSL_fork_prepare()\fR, \fBOPENSSL_fork_parent()\fR, and \fBOPENSSL_fork_child()\fR functions are used to reset this internal state. .PP Platforms without \fBfork\fR\|(2) will probably not need to use these functions. Platforms with \fBfork\fR\|(2) but without \fBpthread_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 \&\fBOPENSSL_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 \fBpthread_atfork\fR\|(3) documentation, which is summarized here. \fBOPENSSL_fork_prepare()\fR should be called before a \fBfork()\fR is done. After the \fBfork()\fR returns, the parent process should call \fBOPENSSL_fork_parent()\fR and the child process should call \fBOPENSSL_fork_child()\fR. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBOPENSSL_fork_prepare()\fR, \fBOPENSSL_fork_parent()\fR and \fBOPENSSL_fork_child()\fR do not return values. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBOPENSSL_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\-2019 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>.