@section @code{stdout}
@findex stdout
-POSIX specification: @url{http://www.opengroup.org/susv3xsh/stdout.html}
+POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/stdout.html}
Gnulib module: ---
One workaround is to use freopen(NULL, ``w'', stdout) on Cygwin 1.5.21
or newer. Another is to use the gnulib ftello module and do
ftello(stdout).
+@item
+POSIX states that a setuid application can guarantee that fd 1 is
+open, but some systems guarantee this even for non-setuid programs.
+If an application is executed with fd 1 closed, use of @code{stdout}
+can affect an unrelated file that happened to be assigned to fd 1.
+The gnulib *-safer modules may be used to guarantee that fd 1 stays
+reserved for @code{stdout}.
@end itemize