Function nginx::DSA_meth_set_sign_setup

pub unsafe extern "C" fn DSA_meth_set_sign_setup(
    dsam: *mut DSA_METHOD, 
    sign_setup: Option<unsafe extern "C" fn(arg1: *mut DSA, arg2: *mut BN_CTX, arg3: *mut *mut BIGNUM, arg4: *mut *mut BIGNUM) -> c_int>
) -> c_int