@itemize
@item
This function is missing on some platforms:
-MacOS X 10.3, OpenBSD 3.8, Minix 3.1.8, mingw, BeOS.
+MacOS X 10.3, OpenBSD 3.8, Minix 3.1.8, mingw, MSVC 9, BeOS.
@end itemize
Portability problems not fixed by Gnulib:
@itemize
@item
+This function is not declared on some platforms:
+IRIX 5.3.
+@item
On Solaris 11 2010-11, this function fails on all BSD-style @file{/dev/pty*}
device files.
+@item
+This function is not thread-safe on some platforms:
+Cygwin 1.7.9.
+Likewise, the gnulib replacement is not thread-safe.
@end itemize
+
+Note that the Gnulib module @code{ptsname_r} is a version of this
+function that is more likely to be thread-safe.