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Add support to free/allocate SSL buffers OpenSSL already has the feature of SSL_MODE_RELEASE_BUFFERS that can be set to release the read or write buffers when data has finished reading or writing. OpenSSL will automatically re-allocate the buffers as needed. This can be quite aggressive in terms of memory allocation. This provides a manual mechanism. SSL_free_buffers() will free the data buffers if there's no pending data. SSL_alloc_buffers() will realloc them; but this function is not strictly necessary, as it's still done automatically in the state machine. Reviewed-by: Richard Levitte <levitte@openssl.org> Reviewed-by: Rich Salz <rsalz@openssl.org> (Merged from https://github.com/openssl/openssl/pull/2240)
2017-01-13 16:00:26 +00:00
=pod
=head1 NAME
SSL_free_buffers, SSL_alloc_buffers - manage SSL structure buffers
=head1 SYNOPSIS
#include <openssl/ssl.h>
int SSL_free_buffers(SSL *ssl);
int SSL_alloc_buffers(SSL *ssl);
=head1 DESCRIPTION
SSL_free_buffers() frees the read and write buffers of the given B<ssl>.
SSL_alloc_buffers() allocates the read and write buffers of the given B<ssl>.
The B<SSL_MODE_RELEASE_BUFFERS> mode releases read or write buffers whenever
the buffers have been drained. These functions allow applications to manually
control when buffers are freed and allocated.
Fix some typo and comments [skip ci] Reviewed-by: Andy Polyakov <appro@openssl.org> Reviewed-by: Rich Salz <rsalz@openssl.org> (Merged from https://github.com/openssl/openssl/pull/4149)
2017-08-12 18:02:24 +00:00
After freeing the buffers, the buffers are automatically reallocated upon a
Add support to free/allocate SSL buffers OpenSSL already has the feature of SSL_MODE_RELEASE_BUFFERS that can be set to release the read or write buffers when data has finished reading or writing. OpenSSL will automatically re-allocate the buffers as needed. This can be quite aggressive in terms of memory allocation. This provides a manual mechanism. SSL_free_buffers() will free the data buffers if there's no pending data. SSL_alloc_buffers() will realloc them; but this function is not strictly necessary, as it's still done automatically in the state machine. Reviewed-by: Richard Levitte <levitte@openssl.org> Reviewed-by: Rich Salz <rsalz@openssl.org> (Merged from https://github.com/openssl/openssl/pull/2240)
2017-01-13 16:00:26 +00:00
new read or write. The SSL_alloc_buffers() does not need to be called, but
can be used to make sure the buffers are pre-allocated. This can be used to
avoid allocation during data processing or with CRYPTO_set_mem_functions()
to control where and how buffers are allocated.
=head1 RETURN VALUES
The following return values can occur:
=over 4
=item 0 (Failure)
The SSL_free_buffers() function returns 0 when there is pending data to be
read or written. The SSL_alloc_buffers() function returns 0 when there is
an allocation failure.
=item 1 (Success)
The SSL_free_buffers() function returns 1 if the buffers have been freed. This
value is also returned if the buffers had been freed before calling
SSL_free_buffers().
The SSL_alloc_buffers() function returns 1 if the buffers have been allocated.
Fix some typo and comments [skip ci] Reviewed-by: Andy Polyakov <appro@openssl.org> Reviewed-by: Rich Salz <rsalz@openssl.org> (Merged from https://github.com/openssl/openssl/pull/4149)
2017-08-12 18:02:24 +00:00
This value is also returned if the buffers had been allocated before calling
Add support to free/allocate SSL buffers OpenSSL already has the feature of SSL_MODE_RELEASE_BUFFERS that can be set to release the read or write buffers when data has finished reading or writing. OpenSSL will automatically re-allocate the buffers as needed. This can be quite aggressive in terms of memory allocation. This provides a manual mechanism. SSL_free_buffers() will free the data buffers if there's no pending data. SSL_alloc_buffers() will realloc them; but this function is not strictly necessary, as it's still done automatically in the state machine. Reviewed-by: Richard Levitte <levitte@openssl.org> Reviewed-by: Rich Salz <rsalz@openssl.org> (Merged from https://github.com/openssl/openssl/pull/2240)
2017-01-13 16:00:26 +00:00
SSL_alloc_buffers().
=back
=head1 SEE ALSO
L<SSL_free(3)>, L<SSL_clear(3)>,
L<SSL_new(3)>, L<SSL_CTX_set_mode(3)>,
L<CRYPTO_set_mem_functions>
=head1 COPYRIGHT
Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
Following the license change, modify the boilerplates in doc/man3/ [skip ci] Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/7829)
2018-12-06 13:04:44 +00:00
Licensed under the Apache License 2.0 (the "License"). You may not use
Add support to free/allocate SSL buffers OpenSSL already has the feature of SSL_MODE_RELEASE_BUFFERS that can be set to release the read or write buffers when data has finished reading or writing. OpenSSL will automatically re-allocate the buffers as needed. This can be quite aggressive in terms of memory allocation. This provides a manual mechanism. SSL_free_buffers() will free the data buffers if there's no pending data. SSL_alloc_buffers() will realloc them; but this function is not strictly necessary, as it's still done automatically in the state machine. Reviewed-by: Richard Levitte <levitte@openssl.org> Reviewed-by: Rich Salz <rsalz@openssl.org> (Merged from https://github.com/openssl/openssl/pull/2240)
2017-01-13 16:00:26 +00:00
this file except in compliance with the License. You can obtain a copy
in the file LICENSE in the source distribution or at
L<https://www.openssl.org/source/license.html>.
=cut
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