POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/open.html}
-Gnulib module: open
+Gnulib module: open, fchdir
-Portability problems fixed by Gnulib:
+Portability problems fixed by the Gnulib module open:
@itemize
@item
This function does not fail when the file name argument ends in a slash
recognize the @file{/dev/null} filename.
@end itemize
+Portability problems fixed by the Gnulib module fchdir:
+@itemize
+@item
+On Windows platforms (excluding Cygwin), this function fails to open a
+read-only descriptor for directories.
+@end itemize
+
Portability problems not fixed by Gnulib:
@itemize
@item