log10f-ieee: Work around test failure on NetBSD 5.1.

[gnulib.git] / doc / posix-functions / fopen.texi

diff --git a/doc/posix-functions/fopen.texi b/doc/posix-functions/fopen.texi
index 37edf9c..167a147 100644 (file)
--- a/doc/posix-functions/fopen.texi
+++ b/doc/posix-functions/fopen.texi
@@ -2,13 +2,21 @@
 @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
 
 Portability problems fixed by Gnulib:
 @itemize
 @item
+This function does not fail when the file name argument ends in a slash
+and (without the slash) names a nonexistent file or a file that is not a
+directory, on some platforms:
+HP-UX 11.00, AIX 7.1, Solaris 9, Irix 5.3.
+@item
+On platforms where @code{off_t} is a 32-bit type, @code{fopen} may not work
+correctly with files larger than 2 GB.  (Cf. @code{AC_SYS_LARGEFILE}.)
+@item
 On Windows platforms (excluding Cygwin), this function does usually not
 recognize the @file{/dev/null} filename.
 @end itemize
@@ -22,4 +30,10 @@ upon failure.
 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