BIO_FLAGS_SHOULD_RETRY
BIO_set_flags(b, (BIO_FLAGS_IO_SPECIAL | BIO_FLAGS_SHOULD_RETRY))
BIO_set_flags(b, (BIO_FLAGS_READ | BIO_FLAGS_SHOULD_RETRY))
BIO_set_flags(b, (BIO_FLAGS_WRITE | BIO_FLAGS_SHOULD_RETRY))
BIO_clear_flags(b, (BIO_FLAGS_RWS | BIO_FLAGS_SHOULD_RETRY))
BIO_test_flags(b, (BIO_FLAGS_RWS | BIO_FLAGS_SHOULD_RETRY))
#define BIO_should_retry(a) BIO_test_flags(a, BIO_FLAGS_SHOULD_RETRY)
BIO_set_flags(b, BIO_FLAGS_READ | BIO_FLAGS_SHOULD_RETRY);
BIO_set_flags(b, BIO_FLAGS_WRITE | BIO_FLAGS_SHOULD_RETRY);
BIO_set_flags(b, BIO_FLAGS_IO_SPECIAL | BIO_FLAGS_SHOULD_RETRY);
flags = BIO_test_flags(next, BIO_FLAGS_SHOULD_RETRY | BIO_FLAGS_RWS);
BIO_clear_flags(bio, BIO_FLAGS_SHOULD_RETRY | BIO_FLAGS_RWS);
flags = BIO_test_flags(next, BIO_FLAGS_SHOULD_RETRY | BIO_FLAGS_RWS);
BIO_clear_flags(bio, BIO_FLAGS_SHOULD_RETRY | BIO_FLAGS_RWS);