Function nginx::PEM_write_ECPrivateKey

pub unsafe extern "C" fn PEM_write_ECPrivateKey(
    fp: *mut FILE, 
    x: *mut EC_KEY, 
    enc: *const EVP_CIPHER, 
    kstr: *mut c_uchar, 
    klen: c_int, 
    cb: pem_password_cb, 
    u: *mut c_void
) -> c_int