#include int o_rdonly = O_RDONLY; int o_wronly = O_WRONLY; int o_rdwr = O_RDWR; int o_append = O_APPEND; int o_creat = O_CREAT; int o_dsync = O_DSYNC; int o_excl = O_EXCL; int o_noctty = O_NOCTTY; int o_nonblock = O_NONBLOCK; int o_rsync = O_RSYNC; int o_sync = O_SYNC; int o_trunc = O_TRUNC;