/** number of bytes loaded in \p buf */
size_t loaded;
/** non-zero if the pre_select hook added \p fd to the read fd set */
int check_r;
/** non-zero if the pre_select hook added \p fd to the write fd set */
int check_w;
/** number of bytes loaded in \p buf */
size_t loaded;
/** non-zero if the pre_select hook added \p fd to the read fd set */
int check_r;
/** non-zero if the pre_select hook added \p fd to the write fd set */
int check_w;