@section @code{fopen}
@findex fopen
-POSIX specification: @url{http://www.opengroup.org/susv3xsh/fopen.html}
+POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/fopen.html}
Gnulib module: fopen
@itemize
@item
This function does not fail when the file name argument ends in a slash
-and (without the slash) names a nonexistent file, on some platforms:
-HP-UX 11.00, Solaris 9.
+and (without the slash) names a nonexistent file or a file that is not a
+directory, on some platforms:
+HP-UX 11.00, Solaris 9, Irix 5.3.
@item
On Windows platforms (excluding Cygwin), this function does usually not
recognize the @file{/dev/null} filename.
On Windows, this function returns a file stream in ``text'' mode by default;
this means that it translates @code{'\n'} to CR/LF by default. Use the
@code{"b"} flag if you need reliable binary I/O.
+@item
+On Windows platforms (excluding Cygwin), this function fails to open
+directories for reading. Such streams have implementation-defined
+semantics on other platforms. To avoid directory streams with a
+consistent error message, use @code{fstat} after @code{open} and
+@code{fdopen}, rather than @code{fopen} and @code{fileno}.
@end itemize