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10.1174 tcflush

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/tcflush.html

Gnulib module: —

Portability problems fixed by Gnulib:

Portability problems not fixed by Gnulib:

• This function is missing on some platforms: mingw, MSVC 14, Android 4.4.
• On some platforms, tcflush of TCIFLUSH on a non-tty fails with errno set to EINVAL rather than ENOTTY.
• On some platforms, tcflush of TCOFLUSH on a non-tty fails with errno set to EINVAL or, on Mac OS X, also EOPNOTSUPP or ENODEV, rather than ENOTTY.