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Commit 8626d76a added checking of the return value when reading from the `timer_fd` and calling `sysErrorBelch` to print a warning message. However some error causes (like EINTR) are benign and should just be ignored. Test Plan: validate Reviewers: hvr, austin, bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D2040 (cherry picked from commit 7aa4c52f)
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