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[LibOS] Add O_APPEND emulation for single process #1935

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[LibOS] Add O_APPEND emulation for single process #1935

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Commits on Jul 9, 2024

  1. [LibOS] Add O_APPEND emulation for single process 

    Note that Gramine doesn't support multi-process operations on the same
file anyhow, in particular, the file position is not synchronized among
multiple processes. This commit doesn't change this limitation of
Gramine, thus `O_APPEND` writes don't work correctly (may overwrite file
contents).

Note that Linux has a bug in `pwrite()`. Gramine emulates this bug
in the same way.

A new FS test is added. One LTP test is uncommented.

Signed-off-by: Dmitrii Kuvaiskii <[email protected]>
    @dimakuv
    dimakuv committed Jul 9, 2024
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