Fix procfs's open_and_check_file to work in the presence of threads.
#1059
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Have `open_and_check_file` create a new file descriptor before scanning for directory entries, so that it doesn't share a directory position with other threads. Fixes #1050.
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Have
open_and_check_filecreate a new file descriptor before scanning for directory entries, so that it doesn't share a directory position with other threads.Fixes #1050.