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@node isatty
@section @code{isatty}
@findex isatty
POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/isatty.html}
Gnulib module: isatty
Portability problems fixed by Gnulib:
@itemize
@item
This function is declared in a different header file (namely, @code{<io.h>})
on some platforms:
MSVC 14.
@item
On native Windows, this function also returns true for character devices such
as @file{NUL}.
@item
On native Windows, this function returns false for Cygwin consoles.
@item
This function crashes when invoked with invalid arguments on some platforms:
MSVC 14.
@end itemize
Portability problems not fixed by Gnulib:
@itemize
@end itemize
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