WIP/RFC patch for Linux termios overhaul

[Andreas Schwab]

On Mär 25 2025, H. Peter Anvin wrote:

> My biggest confusion at this point is the libc_hidden_proto () definitions
> in <include/termios.h>:
>
> /* Now define the internal interfaces.  */
> extern int __tcgetattr (int __fd, struct termios *__termios_p);
> extern int __tcsetattr (int __fd, int __optional_actions,
>                         const struct termios *__termios_p);
>
> extern int __libc_tcdrain (int __fd);
>
> libc_hidden_proto (__tcgetattr)
> libc_hidden_proto (tcsetattr)
> libc_hidden_proto (cfsetispeed)
> libc_hidden_proto (cfsetospeed)
>
> This seems... random?! which ones are declared that way?

Those that need it.  All libc-internal references require those aliases.

> The result in my case is that the alias symbols for cfset[io]speed() end
> up marked hidden in libc.a, whereas cfget[io]speed() are not. This seems
> broken...

The visibility is irrelevant for a static link.

-- 
Andreas Schwab, SUSE Labs, schwab@suse.de
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