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Previously the eventlog flush code would fail if `fwrite` wrote less than the requested amount. Like all Unix stream I/O operations, however, `fwrite` isn't guaranteed to write the entire buffer. Here we loop as long as `fwrite` succeeds in writing anything. Fixes #11041. Test Plan: Validate with eventlog Reviewers: austin, simonmar Reviewed By: simonmar Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1415 GHC Trac Issues: #11041
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