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open/rdonlyconstant
open/wronlyconstant
open/rdwrconstant
open/readconstant
open/writeconstant
open/creatconstant
open/appendconstant
open/exclconstant
open/nocttyconstant
open/nonblockconstant
open/truncconstant
open/syncconstant
open/fsyncconstant
open/binaryconstant
open/textconstant

Open flags used with the file-open procedure. open/read is a convenience synonym for open/rdonly, as is open/write for open/wronly.

NOTE: On native Windows builds (all except cygwin), open/noctty, open/nonblock, open/fsync and open/sync are defined as zero because the corresponding flag doesn't exist. This means you can safely add these to any set of flags when opening a file or pipe, but it simply won't have an effect.