Steven Stewart-Gallus added the comment: I found another problem with _close_open_fd_range_safe. POSIX leaves the state of a file descriptor given to close undefined if the close fails with EINTR. I believe but haven't double checked that close should not be retried on EINTR on all of our supported platforms. If you must have absolute portability, block all signals so that close can't fail with EINTR and then unblock them after close. This isn't an actual problem because the code will just close an extra time but it's still bothersome.
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