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gh-90102: Optimize io.FileIO.isatty()#112495
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Only invoke the isatty() system call for character devices andcache the result.
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It does not work, because the file descriptor can be reassigned from tty to non-tty and vice versa. The result of isatty() can not be cached. |
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Only invoke the isatty() system call for character devices and cache the result.