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3.5.4 Open Flags

Moreover, the following flags are available:

sync

All i/o operations are done synchronously

nodelay

The device or file is opened with the O_NDELAY flag. This is needed on some non-Linux architectures.

exclusive

The device or file is opened with the O_EXCL flag. On Linux, this ensures exclusive access to the floppy drive. On most other architectures, and for plain files it has no effect at all.