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ERR_clear_error(3) OpenSSL ERR_clear_error(3)
     ERR_clear_error - clear the error queue
      #include <openssl/err.h>
      void ERR_clear_error(void);
     ERR_clear_error() empties the current thread's error queue.
     ERR_clear_error() has no return value.
     err(3), ERR_get_error(3)
     ERR_clear_error() is available in all versions of SSLeay and
     OpenSSL.
1.0.2t               Last change: 2019-09-10                    1