SSL_CTX_get0_chain_certs
int SSL_CTX_get0_chain_certs(const SSL_CTX *ctx, STACK_OF(X509) **out_chain);
#define SSL_CTX_get0_chain_certs SSL_CTX_get0_chain_certs
return SSL_CTX_get0_chain_certs(ctx, (STACK_OF(X509) **)parg);