/usr/man/cat.3/OPENSSL_no_config.3

OPENSSL_config(3)            OpenSSL            OPENSSL_config(3)

NAME

     OPENSSL_config, OPENSSL_no_config - simple OpenSSL
     configuration functions

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 functionality should use the
     configuration functions such as CONF_modules_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 routines 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 certain 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.

1.0.2t               Last change: 2019-09-10                    1

OPENSSL_config(3)            OpenSSL            OPENSSL_config(3)

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               Last change: 2019-09-10                    2

See also OPENSSL_config(3)