pty: Implement TCSBRK and TCFLSH#12915
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Linux PTYs accept TCSBRK as a no-op and implement TCFLSH by flushing the input and/or output queues. gVisor returned ENOTTY, which breaks programs such as pyserial during terminal setup. Handle TCSBRK in the PTY ioctl paths and route TCFLSH through lineDiscipline.tcFlush(), including packet mode flush notification and queue wakeups, to match Linux PTY semantics. Signed-off-by: Tan Yifeng <yiftan@tencent.com>
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pty: Implement TCSBRK and TCFLSH
Linux PTYs accept TCSBRK as a no-op and implement TCFLSH by flushing the input and/or output queues. gVisor returned ENOTTY, which breaks programs such as pyserial during terminal setup.
Handle TCSBRK in the PTY ioctl paths and route TCFLSH through lineDiscipline.tcFlush(), including packet mode flush notification and queue wakeups, to match Linux PTY semantics.
FUTURE_COPYBARA_INTEGRATE_REVIEW=#12914 from tanyifeng:pty-tcsbrk-tcflsh e00ca0a