/usr/man2/cat.3/OPENSSL_config.3.Z(/usr/man2/cat.3/OPENSSL_config.3.Z)

NAME

       OPENSSL_config, OPENSSL_no_config - simple OpenSSL configuration func-
       tions

SYNOPSIS

        #include <openssl/conf.h>

        void OPENSSL_config(const char *appname);
        void OPENSSL_no_config(void);

DESCRIPTION

       OPENSSL_config() configures OpenSSL using the standard openssl.cnf and
       reads from the application section appname. If appname is NULL then the
       default section, openssl_conf, will be used.  Errors are silently
       ignored.  Multiple calls have no effect.

       OPENSSL_no_config() disables configuration. If called before
       OPENSSL_config() no configuration takes place.

NOTES

       The OPENSSL_config() function is designed to be a very simple "call it
       and forget it" function.  It is however much better than nothing.
       Applications which need finer control over their configuration func-
       tionality should use the configuration functions such as CONF_mod-
       ules_load() directly. This function is deprecated and its use should be
       avoided.  Applications should instead call CONF_modules_load() during
       initialization (that is before starting any threads).

       There are several reasons why calling the OpenSSL configuration rou-
       tines is advisable. For example new ENGINE functionality was added to
       OpenSSL 0.9.7.  In OpenSSL 0.9.7 control functions can be supported by
       ENGINEs, this can be used (among other things) to load dynamic ENGINEs
       from shared libraries (DSOs).  However very few applications currently
       support the control interface and so very few can load and use dynamic
       ENGINEs. Equally in future more sophisticated ENGINEs will require cer-
       tain control operations to customize them. If an application calls
       OPENSSL_config() it doesn't need to know or care about ENGINE control
       operations because they can be performed by editing a configuration
       file.

       Applications should free up configuration at application closedown by
       calling CONF_modules_free().

RETURN VALUES

       Neither OPENSSL_config() nor OPENSSL_no_config() return a value.

SEE ALSO

       conf(5), CONF_load_modules_file(3), CONF_modules_free(3)

HISTORY

       OPENSSL_config() and OPENSSL_no_config() first appeared in OpenSSL
       0.9.7

1.0.2t                            2019-09-10                 OPENSSL_config(3)
See also OPENSSL_no_config(3)