186 lines
5.9 KiB
Groff
Executable File
186 lines
5.9 KiB
Groff
Executable File
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.\" ========================================================================
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.\"
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.IX Title "SSL_ALLOC_BUFFERS 3"
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.TH SSL_ALLOC_BUFFERS 3 "2020-03-02" "3.0.0-dev" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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SSL_free_buffers, SSL_alloc_buffers \- manage SSL structure buffers
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/ssl.h>
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\&
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\& int SSL_free_buffers(SSL *ssl);
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\& int SSL_alloc_buffers(SSL *ssl);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fISSL_free_buffers()\fR frees the read and write buffers of the given \fBssl\fR.
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\&\fISSL_alloc_buffers()\fR allocates the read and write buffers of the given \fBssl\fR.
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.PP
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The \fB\s-1SSL_MODE_RELEASE_BUFFERS\s0\fR mode releases read or write buffers whenever
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the buffers have been drained. These functions allow applications to manually
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control when buffers are freed and allocated.
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.PP
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After freeing the buffers, the buffers are automatically reallocated upon a
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new read or write. The \fISSL_alloc_buffers()\fR does not need to be called, but
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can be used to make sure the buffers are pre-allocated. This can be used to
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avoid allocation during data processing or with \fICRYPTO_set_mem_functions()\fR
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to control where and how buffers are allocated.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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The following return values can occur:
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.IP "0 (Failure)" 4
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.IX Item "0 (Failure)"
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The \fISSL_free_buffers()\fR function returns 0 when there is pending data to be
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read or written. The \fISSL_alloc_buffers()\fR function returns 0 when there is
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an allocation failure.
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.IP "1 (Success)" 4
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.IX Item "1 (Success)"
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The \fISSL_free_buffers()\fR function returns 1 if the buffers have been freed. This
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value is also returned if the buffers had been freed before calling
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\&\fISSL_free_buffers()\fR.
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The \fISSL_alloc_buffers()\fR function returns 1 if the buffers have been allocated.
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This value is also returned if the buffers had been allocated before calling
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\&\fISSL_alloc_buffers()\fR.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIssl\fR\|(7),
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\&\fISSL_free\fR\|(3), \fISSL_clear\fR\|(3),
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\&\fISSL_new\fR\|(3), \fISSL_CTX_set_mode\fR\|(3),
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\&\fICRYPTO_set_mem_functions\fR\|(3)
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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