This is a OS-level pipe that overrides IO#read to provide IO#readpartial-like semantics while remaining Rack::Lint-compatible for EOF, meaning we return nil on EOF instead of raising EOFError.
other threads may force an error to be raised in the read method
check_err! () source
read (len = 16384, buf = '') source
Override IO#read to behave like IO#readpartial, but still return nil on EOF instead of raising EOFError.
Parent: IO
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