SSL_CTX_SET_READ_AHEAD - Online Linux Manual PageSection : 3
Updated : 2021-03-26
Source : 1.1.1k
Note : OpenSSL
NAMESSL_CTX_set_read_ahead, SSL_CTX_get_read_ahead, SSL_set_read_ahead, SSL_get_read_ahead, SSL_CTX_get_default_read_ahead ​− manage whether to read as many input bytes as possible
SYNOPSIS​ #include <openssl/ssl.h> ​ ​ void SSL_set_read_ahead(SSL *s, int yes); ​ int SSL_get_read_ahead(const SSL *s); ​ ​ SSL_CTX_set_read_ahead(SSL_CTX *ctx, int yes); ​ long SSL_CTX_get_read_ahead(SSL_CTX *ctx); ​ long SSL_CTX_get_default_read_ahead(SSL_CTX *ctx);
DESCRIPTION​SSL_CTX_set_read_ahead() and SSL_set_read_ahead() set whether we should read as many input bytes as possible (for nonblocking reads) or not. For example if ​x bytes are currently required by OpenSSL, but y bytes are available from the underlying BIO (where y > x), then OpenSSL will read all y bytes into its buffer (providing that the buffer is large enough) if reading ahead is on, or x bytes otherwise. Setting the parameter yes to 0 turns reading ahead is off, other values turn it on. ​SSL_CTX_set_default_read_ahead() is identical to SSL_CTX_set_read_ahead(). ​SSL_CTX_get_read_ahead() and SSL_get_read_ahead() indicate whether reading ahead has been set or not. ​SSL_CTX_get_default_read_ahead() is identical to SSL_CTX_get_read_ahead().
NOTESThese functions have no impact when used with DTLS. The return values for ​SSL_CTX_get_read_head() and SSL_get_read_ahead() are undefined for DTLS. Setting ​read_ahead can impact the behaviour of the SSL_pending() function (see SSL_pending (3)). Since SSL_read() can return SSL_ERROR_WANT_READ for non-application data records, and SSL_has_pending() can't tell the difference between processed and unprocessed data, it's recommended that if read ahead is turned on that ​SSL_MODE_AUTO_RETRY is not turned off using SSL_CTX_clear_mode(). That will prevent getting SSL_ERROR_WANT_READ when there is still a complete record available that hasn't been processed. If the application wants to continue to use the underlying transport (e.g. TCP connection) after the SSL connection is finished using SSL_shutdown() reading ahead should be turned off. Otherwise the SSL structure might read data that it shouldn't.
RETURN VALUES​SSL_get_read_ahead() and SSL_CTX_get_read_ahead() return 0 if reading ahead is off, and non zero otherwise.
SEE ALSO​ssl (7), SSL_pending (3)
COPYRIGHTCopyright 2015−2020 The OpenSSL Project Authors. All Rights Reserved. Licensed under the OpenSSL license (the ‟License”). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <https://www.openssl.org/source/license.html>. 0
Johanes Gumabo
Data Size   :   10,328 byte
man-SSL_set_read_ahead.3sslBuild   :   2024-12-05, 20:55   :  
Visitor Screen   :   x
Visitor Counter ( page / site )   :   3 / 184,802
Visitor ID   :     :  
Visitor IP   :   3.141.12.236   :  
Visitor Provider   :   AMAZON-02   :  
Provider Position ( lat x lon )   :   39.962500 x -83.006100   :   x
Provider Accuracy Radius ( km )   :   1000   :  
Provider City   :   Columbus   :  
Provider Province   :   Ohio ,   :   ,
Provider Country   :   United States   :  
Provider Continent   :   North America   :  
Visitor Recorder   :   Version   :  
Visitor Recorder   :   Library   :  
Online Linux Manual Page   :   Version   :   Online Linux Manual Page - Fedora.40 - march=x86-64 - mtune=generic - 24.12.05
Online Linux Manual Page   :   Library   :   lib_c - 24.10.03 - march=x86-64 - mtune=generic - Fedora.40
Online Linux Manual Page   :   Library   :   lib_m - 24.10.03 - march=x86-64 - mtune=generic - Fedora.40
Data Base   :   Version   :   Online Linux Manual Page Database - 24.04.13 - march=x86-64 - mtune=generic - fedora-38
Data Base   :   Library   :   lib_c - 23.02.07 - march=x86-64 - mtune=generic - fedora.36
Very long time ago, I have the best tutor, Wenzel Svojanovsky . If someone knows the email address of Wenzel Svojanovsky , please send an email to johanes_gumabo@yahoo.co.id .
If error, please print screen and send to johanes_gumabo@yahoo.co.id
Under development. Support me via PayPal.
ERROR : Need New Coding :         (parse_manual_page_|249|S___SL_CTX_get_default_read_ahead.3ssl|36/37|el══─{─══.|.el══─{─══. ds -- \|\(em\| )         (htmlprn|149|S___SL_CTX_get_default_read_ahead.3ssl|36/37|.el══─{─══. ds --  —  |.el══─{─══. ds -- \|\(em\| )         (parse_manual_page_|249|S___SL_CTX_get_default_read_ahead.3ssl|43|br══─}─══|'br══─}─══ )         (htmlprn|149|S___SL_CTX_get_default_read_ahead.3ssl|43|'br══─}─══ |'br══─}─══ )