doc: Most *_l functions exist in MacOS X 10.5.

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

diff --git a/doc/posix-functions/readlink.texi b/doc/posix-functions/readlink.texi
index e2a2a1e..de898fb 100644 (file)
--- a/doc/posix-functions/readlink.texi
+++ b/doc/posix-functions/readlink.texi
@@ -9,6 +9,13 @@ Gnulib module: readlink
 Portability problems fixed by Gnulib:
 @itemize
 @item
+Some platforms mistakenly succeed on @code{readlink("link/",buf,len)}:
+FreeBSD 7.2, Solaris 9.
+@item
+On some platforms, @code{readlink} returns @code{int} instead of
+@code{ssize_t}:
+FreeBSD 6.0, OpenBSD 3.8, Cygwin 1.5.x.
+@item
 This function is missing on some platforms:
 mingw.
 @end itemize
@@ -24,4 +31,12 @@ directories, Cygwin sets @code{errno} to @code{ENOENT} or @code{EIO} instead of
 When @code{readlink} is called on a file that is not a symbolic link:
 Irix may set @code{errno} to @code{ENXIO} instead of @code{EINVAL}.  Cygwin
 may set errno to @code{EACCES} instead of @code{EINVAL}.
+@item
+Symlink contents do not always have a trailing null byte, and there is
+no indication if symlink contents were truncated if the return value
+matches the length.  Furthermore, AIX 5.1 and HP-UX 11 set
+@code{errno} to @code{ERANGE} rather than returning truncated
+contents, and Linux sets @code{errno} to @code{EINVAL} if the
+requested length is zero.  Use the gnulib module areadlink for
+improved ability to read symlink contents.
 @end itemize