O_DIRECT to read files

[Bruno Diniz de Paula <diniz@cs.rutgers.edu>]

Hi,

has anyone used O_DIRECT flag of open to read files bypassing the buffer
cache of the kernel? I am trying to read using this option but the read
command always returns 0, indicating that zero bytes were read. The
buffer I am using is aligned with the block size, as also the size of
the buffer is multiple of the block size. What is the problem though?

Thanks,

Bruno.
-- 
Bruno Diniz de Paula <diniz@cs.rutgers.edu>
Rutgers University

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