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[gnulib.git] / doc / posix-functions / dup2.texi

diff --git a/doc/posix-functions/dup2.texi b/doc/posix-functions/dup2.texi
index fd2cb07..59bad08 100644 (file)
--- a/doc/posix-functions/dup2.texi
+++ b/doc/posix-functions/dup2.texi
@@ -2,7 +2,7 @@
 @section @code{dup2}
 @findex dup2
 
-POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/dup2.html}
+POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/dup2.html}
 
 Gnulib module: dup2
 
@@ -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