man pty says...
The BSD ioctl(2) operations TIOCSTOP, TIOCSTART, TIOCUCNTL, and TIOCREMOTE
have not been implemented under Linux.
why so? How is these operat开发者_如何学运维ions taken care of in linux?
BSD-style PTYs have been deprecated since Linux 2.6.4. System V (UNIX 98)-style PTYs should be used instead.
That's probably the reason why these ioctl operations remain unimplemented to this day.
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