X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=doc%2Fposix-functions%2Fdup2.texi;h=febbd53cc90eedc24e3f2b2708395ce5110b3689;hb=7c59efd8bc7abb8c79ae969a65ece95e68c9be4c;hp=fd2cb07538410a5f0a7902e967cf53324632ea26;hpb=ade4fb6ef4588f370c1bdbdb90665501140a608d;p=gnulib.git

diff --git a/doc/posix-functions/dup2.texi b/doc/posix-functions/dup2.texi
index fd2cb0753..febbd53cc 100644
--- a/doc/posix-functions/dup2.texi
+++ b/doc/posix-functions/dup2.texi
@@ -25,6 +25,12 @@ This function may return @code{-EBADF} instead of @code{-1} on some platforms:
 Linux releases between July 2008 and May 2009 (versions 2.6.27 to 2.6.29).
 
 @item
+This function returns @code{EMFILE} instead of @code{EBADF} for
+extremely large targets, which interferes with using
+@code{dup2(fd,fd)==fd)} as the minimal @code{EBADF} filter:
+FreeBSD 6.1, Cygwin 1.5.
+
+@item
 This function is missing on some older platforms.
 @end itemize