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 04c4fe3..80b1704 100644 (file)
--- a/doc/posix-functions/unsetenv.texi
+++ b/doc/posix-functions/unsetenv.texi
@@ -15,8 +15,20 @@ AIX 5.1, HP-UX 11, IRIX 6.5, Solaris 9, mingw, BeOS.
 This function has the return type @samp{void} instead of @samp{int} on some
 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 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
+environment variable, not all of them, on some platforms:
+Solaris 10.
 @end itemize
 
 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