Re: Q.: Why does tty_ioctl.c: set_termios return EINTR instead ofERESTARTSYS?

[Alan Cox]

 Is there a particular reason why it cannot be made restartable?
> 
> EINTR is used when there is no way to rollback already performed
> actions. In this case, a flush could be performed. (This holds only for
> TCSETSF, TCSETSF2 and similar.) So I think this is the reason we cannot
> return ERESTARTSYS.
> 
> However I CCed tty fellows, they may have a different opinion.

I don't actually know. I think Linus or Ted T'so were still doing the tty
code that long back. Ted also did some compliance testing on it way back
when (1995 or so ?)
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