vasnprintf: Add more tests.

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

diff --git a/doc/posix-functions/unsetenv.texi b/doc/posix-functions/unsetenv.texi
index 99a5e69..80b1704 100644 (file)
--- a/doc/posix-functions/unsetenv.texi
+++ b/doc/posix-functions/unsetenv.texi
@@ -17,7 +17,7 @@ platforms:
 MacOS X 10.3, FreeBSD 6.0, NetBSD 1.6, OpenBSD 3.8, OSF/1 5.1.
 @item
 On some platforms, this function does not fail with @samp{EINVAL} when
-passed a null pointer, an empty string, or a string containing @samp{=}:
+passed an empty string or a string containing @samp{=}:
 FreeBSD 6.0, NetBSD 1.6, OpenBSD 3.8.
 @item
 This function removes only the first value association for the given
@@ -27,4 +27,8 @@ Solaris 10.
 
 Portability problems not fixed by Gnulib:
 @itemize
+@item
+Older versions of POSIX required that @code{unsetenv(NULL)} gracefully
+fail with @code{EINVAL}, but not all implementations guarantee this,
+and the requirement was removed.
 @end itemize