test-perror: relax test to ignore cygwin bug

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

diff --git a/doc/posix-functions/putc_unlocked.texi b/doc/posix-functions/putc_unlocked.texi
index 0c3381e..4fbf3c4 100644 (file)
--- a/doc/posix-functions/putc_unlocked.texi
+++ b/doc/posix-functions/putc_unlocked.texi
@@ -15,4 +15,8 @@ Portability problems not fixed by Gnulib:
 @item
 This function is missing on some platforms:
 mingw.
+@item
+On some platforms, this function does not set @code{errno} or the
+stream error indicator on attempts to write to a read-only stream:
+Cygwin 1.7.9.
 @end itemize