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BIO_free.3
.\" 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" BIO_new, BIO_up_ref, BIO_free, BIO_vfree, BIO_free_all \&\- BIO allocation and freeing functions .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/bio.h> \& \& BIO * BIO_new(const BIO_METHOD *type); \& int BIO_up_ref(BIO *a); \& int BIO_free(BIO *a); \& void BIO_vfree(BIO *a); \& void BIO_free_all(BIO *a); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" The \fBBIO_new()\fR function returns a new \s-1BIO\s0 using method \fBtype\fR. .PP \&\fBBIO_up_ref()\fR increments the reference count associated with the \s-1BIO\s0 object. .PP \&\fBBIO_free()\fR frees up a single \s-1BIO,\s0 \fBBIO_vfree()\fR also frees up a single \s-1BIO\s0 but it does not return a value. If \fBa\fR is \s-1NULL\s0 nothing is done. Calling \fBBIO_free()\fR may also have some effect on the underlying I/O structure, for example it may close the file being referred to under certain circumstances. For more details see the individual \&\s-1BIO_METHOD\s0 descriptions. .PP \&\fBBIO_free_all()\fR frees up an entire \s-1BIO\s0 chain, it does not halt if an error occurs freeing up an individual \s-1BIO\s0 in the chain. If \fBa\fR is \s-1NULL\s0 nothing is done. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBBIO_new()\fR returns a newly created \s-1BIO\s0 or \s-1NULL\s0 if the call fails. .PP \&\fBBIO_up_ref()\fR and \fBBIO_free()\fR return 1 for success and 0 for failure. .PP \&\fBBIO_free_all()\fR and \fBBIO_vfree()\fR do not return values. .SH "NOTES" .IX Header "NOTES" If \fBBIO_free()\fR is called on a \s-1BIO\s0 chain it will only free one \s-1BIO\s0 resulting in a memory leak. .PP Calling \fBBIO_free_all()\fR on a single \s-1BIO\s0 has the same effect as calling \fBBIO_free()\fR on it other than the discarded return value. .SH "HISTORY" .IX Header "HISTORY" \&\fBBIO_set()\fR was removed in OpenSSL 1.1.0 as \s-1BIO\s0 type is now opaque. .SH "EXAMPLES" .IX Header "EXAMPLES" Create a memory \s-1BIO:\s0 .PP .Vb 1 \& BIO *mem = BIO_new(BIO_s_mem()); .Ve .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2000\-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>.
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