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Summary: There seems to be a race condition between the pipe closing and the child process death. Likely these two events are not atomic on some versions of linux. With the removal of `WNOHANG` we eliminate the race condition, however if the child closes the pipe intentionally then it could result in the test runner hanging. I find this situation less likely, where as I experience failures locally with this race condition rather consistently. Reviewers: sivachandra, abrachet Reviewed By: sivachandra, abrachet Subscribers: MaskRay, jfb, tschuett, libc-commits Tags: #libc-project Differential Revision: https://reviews.llvm.org/D76267