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A comment on The history of Unix's ioctl and signal about window sizes. Parent comment

Re:The history of Unix's ioctl and signal about window sizes by clausecker on Monday November 04, 2024 @09:19AM (#42041731)
A signal means that the application can immediately redraw its UI to the new dimension even if it is not currently reading input.

Also, if the size was reported in-band, it would mess up applications that are not aware of that in-band signalling.

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