#define cs_want_read(handle) ((handle)->io_pending & CS_WANT_READ)
#define cs_want_write(handle) ((handle)->io_pending & CS_WANT_WRITE)
#define cs_set_blocking(handle,blocking) ((handle)->f_set_blocking(handle, blocking))
#define cs_want_read(handle) ((handle)->io_pending & CS_WANT_READ)
#define cs_want_write(handle) ((handle)->io_pending & CS_WANT_WRITE)
#define cs_set_blocking(handle,blocking) ((handle)->f_set_blocking(handle, blocking))