HITLS_ERR_SYSCALL HITLS_ERR_TLS HITLS_ERROR HITLS_WANT_ACCEPT HITLS_WANT_CONNECT HITLS_WANT_READ HITLS_WANT_WRITE

HITLS_WANT_READ #define HITLS_WANT_READ   3 indicates that the receiving buffer is empty and the interface can be called to continue receiving data.